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package org.hl7.fhir.dstu3.utils;
import java.math.BigDecimal;
import java.util.*;
import org.hl7.fhir.dstu3.context.IWorkerContext;
import org.hl7.fhir.dstu3.model.*;
import org.hl7.fhir.dstu3.model.ElementDefinition.TypeRefComponent;
import org.hl7.fhir.dstu3.model.ExpressionNode.*;
import org.hl7.fhir.dstu3.model.StructureDefinition.StructureDefinitionKind;
import org.hl7.fhir.dstu3.model.StructureDefinition.TypeDerivationRule;
import org.hl7.fhir.dstu3.model.TypeDetails.ProfiledType;
import org.hl7.fhir.dstu3.utils.FHIRLexer.FHIRLexerException;
import org.hl7.fhir.dstu3.utils.FHIRPathEngine.IEvaluationContext.FunctionDetails;
import org.hl7.fhir.exceptions.*;
import org.hl7.fhir.utilities.Utilities;
import org.hl7.fhir.utilities.ucum.Decimal;
import ca.uhn.fhir.model.api.TemporalPrecisionEnum;
import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
import ca.uhn.fhir.util.ElementUtil;
import static org.apache.commons.lang3.StringUtils.length;
/**
*
* @author Grahame Grieve
*
*/
public class FHIRPathEngine {
private IWorkerContext worker;
private IEvaluationContext hostServices;
private StringBuilder log = new StringBuilder();
private Set primitiveTypes = new HashSet();
private Map allTypes = new HashMap();
// if the fhir path expressions are allowed to use constants beyond those defined in the specification
// the application can implement them by providing a constant resolver
public interface IEvaluationContext {
public class FunctionDetails {
private String description;
private int minParameters;
private int maxParameters;
public FunctionDetails(String description, int minParameters, int maxParameters) {
super();
this.description = description;
this.minParameters = minParameters;
this.maxParameters = maxParameters;
}
public String getDescription() {
return description;
}
public int getMinParameters() {
return minParameters;
}
public int getMaxParameters() {
return maxParameters;
}
}
/**
* A constant reference - e.g. a reference to a name that must be resolved in context.
* The % will be removed from the constant name before this is invoked.
*
* This will also be called if the host invokes the FluentPath engine with a context of null
*
* @param appContext - content passed into the fluent path engine
* @param name - name reference to resolve
* @return the value of the reference (or null, if it's not valid, though can throw an exception if desired)
*/
public Base resolveConstant(Object appContext, String name) throws PathEngineException;
public TypeDetails resolveConstantType(Object appContext, String name) throws PathEngineException;
/**
* when the .log() function is called
*
* @param argument
* @param focus
* @return
*/
public boolean log(String argument, List focus);
// extensibility for functions
/**
*
* @param functionName
* @return null if the function is not known
*/
public FunctionDetails resolveFunction(String functionName);
/**
* Check the function parameters, and throw an error if they are incorrect, or return the type for the function
* @param functionName
* @param parameters
* @return
*/
public TypeDetails checkFunction(Object appContext, String functionName, List parameters) throws PathEngineException;
/**
* @param appContext
* @param functionName
* @param parameters
* @return
*/
public List executeFunction(Object appContext, String functionName, List> parameters);
/**
* Implementation of resolve() function. Passed a string, return matching resource, if one is known - else null
* @param appInfo
* @param url
* @return
*/
public Base resolveReference(Object appContext, String url);
}
/**
* @param worker - used when validating paths (@check), and used doing value set membership when executing tests (once that's defined)
*/
public FHIRPathEngine(IWorkerContext worker) {
super();
this.worker = worker;
for (StructureDefinition sd : worker.allStructures()) {
if (sd.getDerivation() == TypeDerivationRule.SPECIALIZATION)
allTypes.put(sd.getName(), sd);
if (sd.getDerivation() == TypeDerivationRule.SPECIALIZATION && sd.getKind() == StructureDefinitionKind.PRIMITIVETYPE) {
primitiveTypes.add(sd.getName());
}
}
}
// --- 3 methods to override in children -------------------------------------------------------
// if you don't override, it falls through to the using the base reference implementation
// HAPI overrides to these to support extending the base model
public IEvaluationContext getHostServices() {
return hostServices;
}
public void setHostServices(IEvaluationContext constantResolver) {
this.hostServices = constantResolver;
}
/**
* Given an item, return all the children that conform to the pattern described in name
*
* Possible patterns:
* - a simple name (which may be the base of a name with [] e.g. value[x])
* - a name with a type replacement e.g. valueCodeableConcept
* - * which means all children
* - ** which means all descendants
*
* @param item
* @param name
* @param result
* @throws FHIRException
*/
protected void getChildrenByName(Base item, String name, List result) throws FHIRException {
Base[] list = item.listChildrenByName(name, false);
if (list != null)
for (Base v : list)
if (v != null)
result.add(v);
}
// --- public API -------------------------------------------------------
/**
* Parse a path for later use using execute
*
* @param path
* @return
* @throws PathEngineException
* @throws Exception
*/
public ExpressionNode parse(String path) throws FHIRLexerException {
FHIRLexer lexer = new FHIRLexer(path);
if (lexer.done())
throw lexer.error("Path cannot be empty");
ExpressionNode result = parseExpression(lexer, true);
if (!lexer.done())
throw lexer.error("Premature ExpressionNode termination at unexpected token \""+lexer.getCurrent()+"\"");
result.check();
return result;
}
/**
* Parse a path that is part of some other syntax
*
* @param path
* @return
* @throws PathEngineException
* @throws Exception
*/
public ExpressionNode parse(FHIRLexer lexer) throws FHIRLexerException {
ExpressionNode result = parseExpression(lexer, true);
result.check();
return result;
}
/**
* check that paths referred to in the ExpressionNode are valid
*
* xPathStartsWithValueRef is a hack work around for the fact that FHIR Path sometimes needs a different starting point than the xpath
*
* returns a list of the possible types that might be returned by executing the ExpressionNode against a particular context
*
* @param context - the logical type against which this path is applied
* @param path - the FHIR Path statement to check
* @throws DefinitionException
* @throws PathEngineException
* @if the path is not valid
*/
public TypeDetails check(Object appContext, String resourceType, String context, ExpressionNode expr) throws FHIRLexerException, PathEngineException, DefinitionException {
// if context is a path that refers to a type, do that conversion now
TypeDetails types;
if (context == null) {
types = null; // this is a special case; the first path reference will have to resolve to something in the context
} else if (!context.contains(".")) {
StructureDefinition sd = worker.fetchResource(StructureDefinition.class, context);
types = new TypeDetails(CollectionStatus.SINGLETON, sd.getUrl());
} else {
String ctxt = context.substring(0, context.indexOf('.'));
if (Utilities.isAbsoluteUrl(resourceType)) {
ctxt = resourceType.substring(0, resourceType.lastIndexOf("/")+1)+ctxt;
}
StructureDefinition sd = worker.fetchResource(StructureDefinition.class, ctxt);
if (sd == null)
throw new PathEngineException("Unknown context "+context);
ElementDefinitionMatch ed = getElementDefinition(sd, context, true);
if (ed == null)
throw new PathEngineException("Unknown context element "+context);
if (ed.fixedType != null)
types = new TypeDetails(CollectionStatus.SINGLETON, ed.fixedType);
else if (ed.getDefinition().getType().isEmpty() || isAbstractType(ed.getDefinition().getType()))
types = new TypeDetails(CollectionStatus.SINGLETON, ctxt+"#"+context);
else {
types = new TypeDetails(CollectionStatus.SINGLETON);
for (TypeRefComponent t : ed.getDefinition().getType())
types.addType(t.getCode());
}
}
return executeType(new ExecutionTypeContext(appContext, resourceType, context, types), types, expr, true);
}
public TypeDetails check(Object appContext, StructureDefinition sd, String context, ExpressionNode expr) throws FHIRLexerException, PathEngineException, DefinitionException {
// if context is a path that refers to a type, do that conversion now
TypeDetails types;
if (!context.contains(".")) {
types = new TypeDetails(CollectionStatus.SINGLETON, sd.getUrl());
} else {
ElementDefinitionMatch ed = getElementDefinition(sd, context, true);
if (ed == null)
throw new PathEngineException("Unknown context element "+context);
if (ed.fixedType != null)
types = new TypeDetails(CollectionStatus.SINGLETON, ed.fixedType);
else if (ed.getDefinition().getType().isEmpty() || isAbstractType(ed.getDefinition().getType()))
types = new TypeDetails(CollectionStatus.SINGLETON, sd.getUrl()+"#"+context);
else {
types = new TypeDetails(CollectionStatus.SINGLETON);
for (TypeRefComponent t : ed.getDefinition().getType())
types.addType(t.getCode());
}
}
return executeType(new ExecutionTypeContext(appContext, sd.getUrl(), context, types), types, expr, true);
}
public TypeDetails check(Object appContext, StructureDefinition sd, ExpressionNode expr) throws FHIRLexerException, PathEngineException, DefinitionException {
// if context is a path that refers to a type, do that conversion now
TypeDetails types = null; // this is a special case; the first path reference will have to resolve to something in the context
return executeType(new ExecutionTypeContext(appContext, sd == null ? null : sd.getUrl(), null, types), types, expr, true);
}
public TypeDetails check(Object appContext, String resourceType, String context, String expr) throws FHIRLexerException, PathEngineException, DefinitionException {
return check(appContext, resourceType, context, parse(expr));
}
/**
* evaluate a path and return the matching elements
*
* @param base - the object against which the path is being evaluated
* @param ExpressionNode - the parsed ExpressionNode statement to use
* @return
* @throws FHIRException
* @
*/
public List evaluate(Base base, ExpressionNode ExpressionNode) throws FHIRException {
List list = new ArrayList();
if (base != null)
list.add(base);
log = new StringBuilder();
return execute(new ExecutionContext(null, base != null && base.isResource() ? base : null, base, null, base), list, ExpressionNode, true);
}
/**
* evaluate a path and return the matching elements
*
* @param base - the object against which the path is being evaluated
* @param path - the FHIR Path statement to use
* @return
* @throws FHIRException
* @
*/
public List evaluate(Base base, String path) throws FHIRException {
ExpressionNode exp = parse(path);
List list = new ArrayList();
if (base != null)
list.add(base);
log = new StringBuilder();
return execute(new ExecutionContext(null, base.isResource() ? base : null, base, null, base), list, exp, true);
}
/**
* evaluate a path and return the matching elements
*
* @param base - the object against which the path is being evaluated
* @param ExpressionNode - the parsed ExpressionNode statement to use
* @return
* @throws FHIRException
* @
*/
public List evaluate(Object appContext, Resource resource, Base base, ExpressionNode ExpressionNode) throws FHIRException {
List list = new ArrayList();
if (base != null)
list.add(base);
log = new StringBuilder();
return execute(new ExecutionContext(appContext, resource, base, null, base), list, ExpressionNode, true);
}
/**
* evaluate a path and return the matching elements
*
* @param base - the object against which the path is being evaluated
* @param ExpressionNode - the parsed ExpressionNode statement to use
* @return
* @throws FHIRException
* @
*/
public List evaluate(Object appContext, Base resource, Base base, ExpressionNode ExpressionNode) throws FHIRException {
List list = new ArrayList();
if (base != null)
list.add(base);
log = new StringBuilder();
return execute(new ExecutionContext(appContext, resource, base, null, base), list, ExpressionNode, true);
}
/**
* evaluate a path and return the matching elements
*
* @param base - the object against which the path is being evaluated
* @param path - the FHIR Path statement to use
* @return
* @throws FHIRException
* @
*/
public List evaluate(Object appContext, Resource resource, Base base, String path) throws FHIRException {
ExpressionNode exp = parse(path);
List list = new ArrayList();
if (base != null)
list.add(base);
log = new StringBuilder();
return execute(new ExecutionContext(appContext, resource, base, null, base), list, exp, true);
}
/**
* evaluate a path and return true or false (e.g. for an invariant)
*
* @param base - the object against which the path is being evaluated
* @param path - the FHIR Path statement to use
* @return
* @throws FHIRException
* @
*/
public boolean evaluateToBoolean(Resource resource, Base base, String path) throws FHIRException {
return convertToBoolean(evaluate(null, resource, base, path));
}
/**
* evaluate a path and return true or false (e.g. for an invariant)
*
* @param base - the object against which the path is being evaluated
* @param path - the FHIR Path statement to use
* @return
* @throws FHIRException
* @
*/
public boolean evaluateToBoolean(Resource resource, Base base, ExpressionNode node) throws FHIRException {
return convertToBoolean(evaluate(null, resource, base, node));
}
/**
* evaluate a path and return true or false (e.g. for an invariant)
*
* @param appinfo - application context
* @param base - the object against which the path is being evaluated
* @param path - the FHIR Path statement to use
* @return
* @throws FHIRException
* @
*/
public boolean evaluateToBoolean(Object appInfo, Resource resource, Base base, ExpressionNode node) throws FHIRException {
return convertToBoolean(evaluate(appInfo, resource, base, node));
}
/**
* evaluate a path and return true or false (e.g. for an invariant)
*
* @param base - the object against which the path is being evaluated
* @param path - the FHIR Path statement to use
* @return
* @throws FHIRException
* @
*/
public boolean evaluateToBoolean(Base resource, Base base, ExpressionNode node) throws FHIRException {
return convertToBoolean(evaluate(null, resource, base, node));
}
/**
* evaluate a path and a string containing the outcome (for display)
*
* @param base - the object against which the path is being evaluated
* @param path - the FHIR Path statement to use
* @return
* @throws FHIRException
* @
*/
public String evaluateToString(Base base, String path) throws FHIRException {
return convertToString(evaluate(base, path));
}
public String evaluateToString(Object appInfo, Base resource, Base base, ExpressionNode node) throws FHIRException {
return convertToString(evaluate(appInfo, resource, base, node));
}
/**
* worker routine for converting a set of objects to a string representation
*
* @param items - result from @evaluate
* @return
*/
public String convertToString(List items) {
StringBuilder b = new StringBuilder();
boolean first = true;
for (Base item : items) {
if (first)
first = false;
else
b.append(',');
b.append(convertToString(item));
}
return b.toString();
}
private String convertToString(Base item) {
if (item.isPrimitive())
return item.primitiveValue();
else
return item.toString();
}
/**
* worker routine for converting a set of objects to a boolean representation (for invariants)
*
* @param items - result from @evaluate
* @return
*/
public boolean convertToBoolean(List items) {
if (items == null)
return false;
else if (items.size() == 1 && items.get(0) instanceof BooleanType)
return ((BooleanType) items.get(0)).getValue();
else
return items.size() > 0;
}
private void log(String name, List contents) {
if (hostServices == null || !hostServices.log(name, contents)) {
if (log.length() > 0)
log.append("; ");
log.append(name);
log.append(": ");
boolean first = true;
for (Base b : contents) {
if (first)
first = false;
else
log.append(",");
log.append(convertToString(b));
}
}
}
public String forLog() {
if (log.length() > 0)
return " ("+log.toString()+")";
else
return "";
}
private class ExecutionContext {
private Object appInfo;
private Base resource;
private Base context;
private Base thisItem;
private Map aliases;
public ExecutionContext(Object appInfo, Base resource, Base context, Map aliases, Base thisItem) {
this.appInfo = appInfo;
this.context = context;
this.resource = resource;
this.aliases = aliases;
this.thisItem = thisItem;
}
public Base getResource() {
return resource;
}
public Base getThisItem() {
return thisItem;
}
public void addAlias(String name, List focus) throws FHIRException {
if (aliases == null)
aliases = new HashMap();
else
aliases = new HashMap(aliases); // clone it, since it's going to change
if (focus.size() > 1)
throw new FHIRException("Attempt to alias a collection, not a singleton");
aliases.put(name, focus.size() == 0 ? null : focus.get(0));
}
public Base getAlias(String name) {
return aliases == null ? null : aliases.get(name);
}
}
private class ExecutionTypeContext {
private Object appInfo;
private String resource;
private String context;
private TypeDetails thisItem;
public ExecutionTypeContext(Object appInfo, String resource, String context, TypeDetails thisItem) {
super();
this.appInfo = appInfo;
this.resource = resource;
this.context = context;
this.thisItem = thisItem;
}
public String getResource() {
return resource;
}
public TypeDetails getThisItem() {
return thisItem;
}
}
private ExpressionNode parseExpression(FHIRLexer lexer, boolean proximal) throws FHIRLexerException {
ExpressionNode result = new ExpressionNode(lexer.nextId());
SourceLocation c = lexer.getCurrentStartLocation();
result.setStart(lexer.getCurrentLocation());
// special:
if (lexer.getCurrent().equals("-")) {
lexer.take();
lexer.setCurrent("-"+lexer.getCurrent());
}
if (lexer.getCurrent().equals("+")) {
lexer.take();
lexer.setCurrent("+"+lexer.getCurrent());
}
if (lexer.isConstant(false)) {
checkConstant(lexer.getCurrent(), lexer);
result.setConstant(lexer.take());
result.setKind(Kind.Constant);
result.setEnd(lexer.getCurrentLocation());
} else if ("(".equals(lexer.getCurrent())) {
lexer.next();
result.setKind(Kind.Group);
result.setGroup(parseExpression(lexer, true));
if (!")".equals(lexer.getCurrent()))
throw lexer.error("Found "+lexer.getCurrent()+" expecting a \")\"");
result.setEnd(lexer.getCurrentLocation());
lexer.next();
} else {
if (!lexer.isToken() && !lexer.getCurrent().startsWith("\""))
throw lexer.error("Found "+lexer.getCurrent()+" expecting a token name");
if (lexer.getCurrent().startsWith("\""))
result.setName(lexer.readConstant("Path Name"));
else
result.setName(lexer.take());
result.setEnd(lexer.getCurrentLocation());
if (!result.checkName())
throw lexer.error("Found "+result.getName()+" expecting a valid token name");
if ("(".equals(lexer.getCurrent())) {
Function f = Function.fromCode(result.getName());
FunctionDetails details = null;
if (f == null) {
if (hostServices != null)
details = hostServices.resolveFunction(result.getName());
if (details == null)
throw lexer.error("The name "+result.getName()+" is not a valid function name");
f = Function.Custom;
}
result.setKind(Kind.Function);
result.setFunction(f);
lexer.next();
while (!")".equals(lexer.getCurrent())) {
result.getParameters().add(parseExpression(lexer, true));
if (",".equals(lexer.getCurrent()))
lexer.next();
else if (!")".equals(lexer.getCurrent()))
throw lexer.error("The token "+lexer.getCurrent()+" is not expected here - either a \",\" or a \")\" expected");
}
result.setEnd(lexer.getCurrentLocation());
lexer.next();
checkParameters(lexer, c, result, details);
} else
result.setKind(Kind.Name);
}
ExpressionNode focus = result;
if ("[".equals(lexer.getCurrent())) {
lexer.next();
ExpressionNode item = new ExpressionNode(lexer.nextId());
item.setKind(Kind.Function);
item.setFunction(ExpressionNode.Function.Item);
item.getParameters().add(parseExpression(lexer, true));
if (!lexer.getCurrent().equals("]"))
throw lexer.error("The token "+lexer.getCurrent()+" is not expected here - a \"]\" expected");
lexer.next();
result.setInner(item);
focus = item;
}
if (".".equals(lexer.getCurrent())) {
lexer.next();
focus.setInner(parseExpression(lexer, false));
}
result.setProximal(proximal);
if (proximal) {
while (lexer.isOp()) {
focus.setOperation(ExpressionNode.Operation.fromCode(lexer.getCurrent()));
focus.setOpStart(lexer.getCurrentStartLocation());
focus.setOpEnd(lexer.getCurrentLocation());
lexer.next();
focus.setOpNext(parseExpression(lexer, false));
focus = focus.getOpNext();
}
result = organisePrecedence(lexer, result);
}
return result;
}
private ExpressionNode organisePrecedence(FHIRLexer lexer, ExpressionNode node) {
node = gatherPrecedence(lexer, node, EnumSet.of(Operation.Times, Operation.DivideBy, Operation.Div, Operation.Mod));
node = gatherPrecedence(lexer, node, EnumSet.of(Operation.Plus, Operation.Minus, Operation.Concatenate));
node = gatherPrecedence(lexer, node, EnumSet.of(Operation.Union));
node = gatherPrecedence(lexer, node, EnumSet.of(Operation.LessThen, Operation.Greater, Operation.LessOrEqual, Operation.GreaterOrEqual));
node = gatherPrecedence(lexer, node, EnumSet.of(Operation.Is));
node = gatherPrecedence(lexer, node, EnumSet.of(Operation.Equals, Operation.Equivalent, Operation.NotEquals, Operation.NotEquivalent));
node = gatherPrecedence(lexer, node, EnumSet.of(Operation.And));
node = gatherPrecedence(lexer, node, EnumSet.of(Operation.Xor, Operation.Or));
// last: implies
return node;
}
private ExpressionNode gatherPrecedence(FHIRLexer lexer, ExpressionNode start, EnumSet ops) {
// work : boolean;
// focus, node, group : ExpressionNode;
assert(start.isProximal());
// is there anything to do?
boolean work = false;
ExpressionNode focus = start.getOpNext();
if (ops.contains(start.getOperation())) {
while (focus != null && focus.getOperation() != null) {
work = work || !ops.contains(focus.getOperation());
focus = focus.getOpNext();
}
} else {
while (focus != null && focus.getOperation() != null) {
work = work || ops.contains(focus.getOperation());
focus = focus.getOpNext();
}
}
if (!work)
return start;
// entry point: tricky
ExpressionNode group;
if (ops.contains(start.getOperation())) {
group = newGroup(lexer, start);
group.setProximal(true);
focus = start;
start = group;
} else {
ExpressionNode node = start;
focus = node.getOpNext();
while (!ops.contains(focus.getOperation())) {
node = focus;
focus = focus.getOpNext();
}
group = newGroup(lexer, focus);
node.setOpNext(group);
}
// now, at this point:
// group is the group we are adding to, it already has a .group property filled out.
// focus points at the group.group
do {
// run until we find the end of the sequence
while (ops.contains(focus.getOperation()))
focus = focus.getOpNext();
if (focus.getOperation() != null) {
group.setOperation(focus.getOperation());
group.setOpNext(focus.getOpNext());
focus.setOperation(null);
focus.setOpNext(null);
// now look for another sequence, and start it
ExpressionNode node = group;
focus = group.getOpNext();
if (focus != null) {
while (focus != null && !ops.contains(focus.getOperation())) {
node = focus;
focus = focus.getOpNext();
}
if (focus != null) { // && (focus.Operation in Ops) - must be true
group = newGroup(lexer, focus);
node.setOpNext(group);
}
}
}
}
while (focus != null && focus.getOperation() != null);
return start;
}
private ExpressionNode newGroup(FHIRLexer lexer, ExpressionNode next) {
ExpressionNode result = new ExpressionNode(lexer.nextId());
result.setKind(Kind.Group);
result.setGroup(next);
result.getGroup().setProximal(true);
return result;
}
private void checkConstant(String s, FHIRLexer lexer) throws FHIRLexerException {
if (s.startsWith("\'") && s.endsWith("\'")) {
int i = 1;
while (i < s.length()-1) {
char ch = s.charAt(i);
if (ch == '\\') {
switch (ch) {
case 't':
case 'r':
case 'n':
case 'f':
case '\'':
case '\\':
case '/':
i++;
break;
case 'u':
if (!Utilities.isHex("0x"+s.substring(i, i+4)))
throw lexer.error("Improper unicode escape \\u"+s.substring(i, i+4));
break;
default:
throw lexer.error("Unknown character escape \\"+ch);
}
} else
i++;
}
}
}
// procedure CheckParamCount(c : integer);
// begin
// if exp.Parameters.Count <> c then
// raise lexer.error('The function "'+exp.name+'" requires '+inttostr(c)+' parameters', offset);
// end;
private boolean checkParamCount(FHIRLexer lexer, SourceLocation location, ExpressionNode exp, int count) throws FHIRLexerException {
if (exp.getParameters().size() != count)
throw lexer.error("The function \""+exp.getName()+"\" requires "+Integer.toString(count)+" parameters", location.toString());
return true;
}
private boolean checkParamCount(FHIRLexer lexer, SourceLocation location, ExpressionNode exp, int countMin, int countMax) throws FHIRLexerException {
if (exp.getParameters().size() < countMin || exp.getParameters().size() > countMax)
throw lexer.error("The function \""+exp.getName()+"\" requires between "+Integer.toString(countMin)+" and "+Integer.toString(countMax)+" parameters", location.toString());
return true;
}
private boolean checkParameters(FHIRLexer lexer, SourceLocation location, ExpressionNode exp, FunctionDetails details) throws FHIRLexerException {
switch (exp.getFunction()) {
case Empty: return checkParamCount(lexer, location, exp, 0);
case Not: return checkParamCount(lexer, location, exp, 0);
case Exists: return checkParamCount(lexer, location, exp, 0);
case SubsetOf: return checkParamCount(lexer, location, exp, 1);
case SupersetOf: return checkParamCount(lexer, location, exp, 1);
case IsDistinct: return checkParamCount(lexer, location, exp, 0);
case Distinct: return checkParamCount(lexer, location, exp, 0);
case Count: return checkParamCount(lexer, location, exp, 0);
case Where: return checkParamCount(lexer, location, exp, 1);
case Select: return checkParamCount(lexer, location, exp, 1);
case All: return checkParamCount(lexer, location, exp, 0, 1);
case Repeat: return checkParamCount(lexer, location, exp, 1);
case Item: return checkParamCount(lexer, location, exp, 1);
case As: return checkParamCount(lexer, location, exp, 1);
case Is: return checkParamCount(lexer, location, exp, 1);
case Single: return checkParamCount(lexer, location, exp, 0);
case First: return checkParamCount(lexer, location, exp, 0);
case Last: return checkParamCount(lexer, location, exp, 0);
case Tail: return checkParamCount(lexer, location, exp, 0);
case Skip: return checkParamCount(lexer, location, exp, 1);
case Take: return checkParamCount(lexer, location, exp, 1);
case Iif: return checkParamCount(lexer, location, exp, 2,3);
case ToInteger: return checkParamCount(lexer, location, exp, 0);
case ToDecimal: return checkParamCount(lexer, location, exp, 0);
case ToString: return checkParamCount(lexer, location, exp, 0);
case Substring: return checkParamCount(lexer, location, exp, 1, 2);
case StartsWith: return checkParamCount(lexer, location, exp, 1);
case EndsWith: return checkParamCount(lexer, location, exp, 1);
case Matches: return checkParamCount(lexer, location, exp, 1);
case ReplaceMatches: return checkParamCount(lexer, location, exp, 2);
case Contains: return checkParamCount(lexer, location, exp, 1);
case Replace: return checkParamCount(lexer, location, exp, 2);
case Length: return checkParamCount(lexer, location, exp, 0);
case Children: return checkParamCount(lexer, location, exp, 0);
case Descendants: return checkParamCount(lexer, location, exp, 0);
case MemberOf: return checkParamCount(lexer, location, exp, 1);
case Trace: return checkParamCount(lexer, location, exp, 1);
case Today: return checkParamCount(lexer, location, exp, 0);
case Now: return checkParamCount(lexer, location, exp, 0);
case Resolve: return checkParamCount(lexer, location, exp, 0);
case Extension: return checkParamCount(lexer, location, exp, 1);
case HasValue: return checkParamCount(lexer, location, exp, 0);
case Alias: return checkParamCount(lexer, location, exp, 1);
case AliasAs: return checkParamCount(lexer, location, exp, 1);
case Custom: return checkParamCount(lexer, location, exp, details.getMinParameters(), details.getMaxParameters());
}
return false;
}
private List execute(ExecutionContext context, List focus, ExpressionNode exp, boolean atEntry) throws FHIRException {
// System.out.println("Evaluate {'"+exp.toString()+"'} on "+focus.toString());
List work = new ArrayList();
switch (exp.getKind()) {
case Name:
if (atEntry && exp.getName().equals("$this"))
work.add(context.getThisItem());
else
for (Base item : focus) {
List outcome = execute(context, item, exp, atEntry);
for (Base base : outcome)
if (base != null)
work.add(base);
}
break;
case Function:
List work2 = evaluateFunction(context, focus, exp);
work.addAll(work2);
break;
case Constant:
Base b = processConstant(context, exp.getConstant());
if (b != null)
work.add(b);
break;
case Group:
work2 = execute(context, focus, exp.getGroup(), atEntry);
work.addAll(work2);
}
if (exp.getInner() != null)
work = execute(context, work, exp.getInner(), false);
if (exp.isProximal() && exp.getOperation() != null) {
ExpressionNode next = exp.getOpNext();
ExpressionNode last = exp;
while (next != null) {
List work2 = preOperate(work, last.getOperation());
if (work2 != null)
work = work2;
else if (last.getOperation() == Operation.Is || last.getOperation() == Operation.As) {
work2 = executeTypeName(context, focus, next, false);
work = operate(work, last.getOperation(), work2);
} else {
work2 = execute(context, focus, next, true);
work = operate(work, last.getOperation(), work2);
// System.out.println("Result of {'"+last.toString()+" "+last.getOperation().toCode()+" "+next.toString()+"'}: "+focus.toString());
}
last = next;
next = next.getOpNext();
}
}
// System.out.println("Result of {'"+exp.toString()+"'}: "+work.toString());
return work;
}
private List executeTypeName(ExecutionContext context, List focus, ExpressionNode next, boolean atEntry) {
List result = new ArrayList();
result.add(new StringType(next.getName()));
return result;
}
private List preOperate(List left, Operation operation) {
switch (operation) {
case And:
return isBoolean(left, false) ? makeBoolean(false) : null;
case Or:
return isBoolean(left, true) ? makeBoolean(true) : null;
case Implies:
return convertToBoolean(left) ? null : makeBoolean(true);
default:
return null;
}
}
private List makeBoolean(boolean b) {
List res = new ArrayList();
res.add(new BooleanType(b));
return res;
}
private TypeDetails executeTypeName(ExecutionTypeContext context, TypeDetails focus, ExpressionNode exp, boolean atEntry) throws PathEngineException, DefinitionException {
return new TypeDetails(CollectionStatus.SINGLETON, exp.getName());
}
private TypeDetails executeType(ExecutionTypeContext context, TypeDetails focus, ExpressionNode exp, boolean atEntry) throws PathEngineException, DefinitionException {
TypeDetails result = new TypeDetails(null);
switch (exp.getKind()) {
case Name:
if (atEntry && exp.getName().equals("$this"))
result.update(context.getThisItem());
else if (atEntry && focus == null)
result.update(executeContextType(context, exp.getName()));
else {
for (String s : focus.getTypes()) {
result.update(executeType(s, exp, atEntry));
}
if (result.hasNoTypes())
throw new PathEngineException("The name "+exp.getName()+" is not valid for any of the possible types: "+focus.describe());
}
break;
case Function:
result.update(evaluateFunctionType(context, focus, exp));
break;
case Constant:
result.update(readConstantType(context, exp.getConstant()));
break;
case Group:
result.update(executeType(context, focus, exp.getGroup(), atEntry));
}
exp.setTypes(result);
if (exp.getInner() != null) {
result = executeType(context, result, exp.getInner(), false);
}
if (exp.isProximal() && exp.getOperation() != null) {
ExpressionNode next = exp.getOpNext();
ExpressionNode last = exp;
while (next != null) {
TypeDetails work;
if (last.getOperation() == Operation.Is || last.getOperation() == Operation.As)
work = executeTypeName(context, focus, next, atEntry);
else
work = executeType(context, focus, next, atEntry);
result = operateTypes(result, last.getOperation(), work);
last = next;
next = next.getOpNext();
}
exp.setOpTypes(result);
}
return result;
}
private Base processConstant(ExecutionContext context, String constant) throws PathEngineException {
if (constant.equals("true")) {
return new BooleanType(true);
} else if (constant.equals("false")) {
return new BooleanType(false);
} else if (constant.equals("{}")) {
return null;
} else if (Utilities.isInteger(constant)) {
return new IntegerType(constant);
} else if (Utilities.isDecimal(constant)) {
return new DecimalType(constant);
} else if (constant.startsWith("\'")) {
return new StringType(processConstantString(constant));
} else if (constant.startsWith("%")) {
return resolveConstant(context, constant);
} else if (constant.startsWith("@")) {
return processDateConstant(context.appInfo, constant.substring(1));
} else {
return new StringType(constant);
}
}
private Base processDateConstant(Object appInfo, String value) throws PathEngineException {
if (value.startsWith("T"))
return new TimeType(value.substring(1));
String v = value;
if (v.length() > 10) {
int i = v.substring(10).indexOf("-");
if (i == -1)
i = v.substring(10).indexOf("+");
if (i == -1)
i = v.substring(10).indexOf("Z");
v = i == -1 ? value : v.substring(0, 10+i);
}
if (v.length() > 10)
return new DateTimeType(value);
else
return new DateType(value);
}
private Base resolveConstant(ExecutionContext context, String s) throws PathEngineException {
if (s.equals("%sct"))
return new StringType("http://snomed.info/sct");
else if (s.equals("%loinc"))
return new StringType("http://loinc.org");
else if (s.equals("%ucum"))
return new StringType("http://unitsofmeasure.org");
else if (s.equals("%resource")) {
if (context.resource == null)
throw new PathEngineException("Cannot use %resource in this context");
return context.resource;
} else if (s.equals("%context")) {
return context.context;
} else if (s.equals("%us-zip"))
return new StringType("[0-9]{5}(-[0-9]{4}){0,1}");
else if (s.startsWith("%\"vs-"))
return new StringType("http://hl7.org/fhir/ValueSet/"+s.substring(5, s.length()-1)+"");
else if (s.startsWith("%\"cs-"))
return new StringType("http://hl7.org/fhir/"+s.substring(5, s.length()-1)+"");
else if (s.startsWith("%\"ext-"))
return new StringType("http://hl7.org/fhir/StructureDefinition/"+s.substring(6, s.length()-1));
else if (hostServices == null)
throw new PathEngineException("Unknown fixed constant '"+s+"'");
else
return hostServices.resolveConstant(context.appInfo, s.substring(1));
}
private String processConstantString(String s) throws PathEngineException {
StringBuilder b = new StringBuilder();
int i = 1;
while (i < s.length()-1) {
char ch = s.charAt(i);
if (ch == '\\') {
i++;
switch (s.charAt(i)) {
case 't':
b.append('\t');
break;
case 'r':
b.append('\r');
break;
case 'n':
b.append('\n');
break;
case 'f':
b.append('\f');
break;
case '\'':
b.append('\'');
break;
case '\\':
b.append('\\');
break;
case '/':
b.append('/');
break;
case 'u':
i++;
int uc = Integer.parseInt(s.substring(i, i+4), 16);
b.append((char) uc);
i = i + 3;
break;
default:
throw new PathEngineException("Unknown character escape \\"+s.charAt(i));
}
i++;
} else {
b.append(ch);
i++;
}
}
return b.toString();
}
private List operate(List left, Operation operation, List right) throws FHIRException {
switch (operation) {
case Equals: return opEquals(left, right);
case Equivalent: return opEquivalent(left, right);
case NotEquals: return opNotEquals(left, right);
case NotEquivalent: return opNotEquivalent(left, right);
case LessThen: return opLessThen(left, right);
case Greater: return opGreater(left, right);
case LessOrEqual: return opLessOrEqual(left, right);
case GreaterOrEqual: return opGreaterOrEqual(left, right);
case Union: return opUnion(left, right);
case In: return opIn(left, right);
case Contains: return opContains(left, right);
case Or: return opOr(left, right);
case And: return opAnd(left, right);
case Xor: return opXor(left, right);
case Implies: return opImplies(left, right);
case Plus: return opPlus(left, right);
case Times: return opTimes(left, right);
case Minus: return opMinus(left, right);
case Concatenate: return opConcatenate(left, right);
case DivideBy: return opDivideBy(left, right);
case Div: return opDiv(left, right);
case Mod: return opMod(left, right);
case Is: return opIs(left, right);
case As: return opAs(left, right);
default:
throw new Error("Not Done Yet: "+operation.toCode());
}
}
private List opAs(List left, List right) {
List result = new ArrayList();
if (left.size() != 1 || right.size() != 1)
return result;
else {
String tn = convertToString(right);
if (tn.equals(left.get(0).fhirType()))
result.add(left.get(0));
}
return result;
}
private List opIs(List left, List right) {
List result = new ArrayList();
if (left.size() != 1 || right.size() != 1)
result.add(new BooleanType(false));
else {
String tn = convertToString(right);
result.add(new BooleanType(left.get(0).hasType(tn)));
}
return result;
}
private TypeDetails operateTypes(TypeDetails left, Operation operation, TypeDetails right) {
switch (operation) {
case Equals: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case Equivalent: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case NotEquals: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case NotEquivalent: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case LessThen: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case Greater: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case LessOrEqual: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case GreaterOrEqual: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case Is: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case As: return new TypeDetails(CollectionStatus.SINGLETON, right.getTypes());
case Union: return left.union(right);
case Or: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case And: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case Xor: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case Implies : return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case Times:
TypeDetails result = new TypeDetails(CollectionStatus.SINGLETON);
if (left.hasType(worker, "integer") && right.hasType(worker, "integer"))
result.addType("integer");
else if (left.hasType(worker, "integer", "decimal") && right.hasType(worker, "integer", "decimal"))
result.addType("decimal");
return result;
case DivideBy:
result = new TypeDetails(CollectionStatus.SINGLETON);
if (left.hasType(worker, "integer") && right.hasType(worker, "integer"))
result.addType("decimal");
else if (left.hasType(worker, "integer", "decimal") && right.hasType(worker, "integer", "decimal"))
result.addType("decimal");
return result;
case Concatenate:
result = new TypeDetails(CollectionStatus.SINGLETON, "");
return result;
case Plus:
result = new TypeDetails(CollectionStatus.SINGLETON);
if (left.hasType(worker, "integer") && right.hasType(worker, "integer"))
result.addType("integer");
else if (left.hasType(worker, "integer", "decimal") && right.hasType(worker, "integer", "decimal"))
result.addType("decimal");
else if (left.hasType(worker, "string", "id", "code", "uri") && right.hasType(worker, "string", "id", "code", "uri"))
result.addType("string");
return result;
case Minus:
result = new TypeDetails(CollectionStatus.SINGLETON);
if (left.hasType(worker, "integer") && right.hasType(worker, "integer"))
result.addType("integer");
else if (left.hasType(worker, "integer", "decimal") && right.hasType(worker, "integer", "decimal"))
result.addType("decimal");
return result;
case Div:
case Mod:
result = new TypeDetails(CollectionStatus.SINGLETON);
if (left.hasType(worker, "integer") && right.hasType(worker, "integer"))
result.addType("integer");
else if (left.hasType(worker, "integer", "decimal") && right.hasType(worker, "integer", "decimal"))
result.addType("decimal");
return result;
case In: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case Contains: return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
default:
return null;
}
}
private List opEquals(List left, List right) {
if (left.size() != right.size())
return makeBoolean(false);
boolean res = true;
for (int i = 0; i < left.size(); i++) {
if (!doEquals(left.get(i), right.get(i))) {
res = false;
break;
}
}
return makeBoolean(res);
}
private List opNotEquals(List left, List right) {
if (left.size() != right.size())
return makeBoolean(true);
boolean res = true;
for (int i = 0; i < left.size(); i++) {
if (!doEquals(left.get(i), right.get(i))) {
res = false;
break;
}
}
return makeBoolean(!res);
}
private boolean doEquals(Base left, Base right) {
if (left.isPrimitive() && right.isPrimitive())
return Base.equals(left.primitiveValue(), right.primitiveValue());
else
return Base.compareDeep(left, right, false);
}
private boolean doEquivalent(Base left, Base right) throws PathEngineException {
if (left.hasType("integer") && right.hasType("integer"))
return doEquals(left, right);
if (left.hasType("boolean") && right.hasType("boolean"))
return doEquals(left, right);
if (left.hasType("integer", "decimal", "unsignedInt", "positiveInt") && right.hasType("integer", "decimal", "unsignedInt", "positiveInt"))
return Utilities.equivalentNumber(left.primitiveValue(), right.primitiveValue());
if (left.hasType("date", "dateTime", "time", "instant") && right.hasType("date", "dateTime", "time", "instant"))
return compareDateTimeElements(left, right) == 0;
if (left.hasType("string", "id", "code", "uri") && right.hasType("string", "id", "code", "uri"))
return Utilities.equivalent(convertToString(left), convertToString(right));
throw new PathEngineException(String.format("Unable to determine equivalence between %s and %s", left.fhirType(), right.fhirType()));
}
private List opEquivalent(List left, List right) throws PathEngineException {
if (left.size() != right.size())
return makeBoolean(false);
boolean res = true;
for (int i = 0; i < left.size(); i++) {
boolean found = false;
for (int j = 0; j < right.size(); j++) {
if (doEquivalent(left.get(i), right.get(j))) {
found = true;
break;
}
}
if (!found) {
res = false;
break;
}
}
return makeBoolean(res);
}
private List opNotEquivalent(List left, List right) throws PathEngineException {
if (left.size() != right.size())
return makeBoolean(true);
boolean res = true;
for (int i = 0; i < left.size(); i++) {
boolean found = false;
for (int j = 0; j < right.size(); j++) {
if (doEquivalent(left.get(i), right.get(j))) {
found = true;
break;
}
}
if (!found) {
res = false;
break;
}
}
return makeBoolean(!res);
}
private List opLessThen(List left, List right) throws FHIRException {
if (left.size() == 1 && right.size() == 1 && left.get(0).isPrimitive() && right.get(0).isPrimitive()) {
Base l = left.get(0);
Base r = right.get(0);
if (l.hasType("string") && r.hasType("string"))
return makeBoolean(l.primitiveValue().compareTo(r.primitiveValue()) < 0);
else if ((l.hasType("integer") || l.hasType("decimal")) && (r.hasType("integer") || r.hasType("decimal")))
return makeBoolean(new Double(l.primitiveValue()) < new Double(r.primitiveValue()));
else if ((l.hasType("date", "dateTime", "instant")) && (r.hasType("date", "dateTime", "instant")))
return makeBoolean(compareDateTimeElements(l, r) < 0);
else if ((l.hasType("time")) && (r.hasType("time")))
return makeBoolean(l.primitiveValue().compareTo(r.primitiveValue()) < 0);
} else if (left.size() == 1 && right.size() == 1 && left.get(0).fhirType().equals("Quantity") && right.get(0).fhirType().equals("Quantity") ) {
List lUnit = left.get(0).listChildrenByName("unit");
List rUnit = right.get(0).listChildrenByName("unit");
if (Base.compareDeep(lUnit, rUnit, true)) {
return opLessThen(left.get(0).listChildrenByName("value"), right.get(0).listChildrenByName("value"));
} else {
throw new InternalErrorException("Canonical Comparison isn't done yet");
}
}
return new ArrayList();
}
private List opGreater(List left, List right) throws FHIRException {
if (left.size() == 1 && right.size() == 1 && left.get(0).isPrimitive() && right.get(0).isPrimitive()) {
Base l = left.get(0);
Base r = right.get(0);
if (l.hasType("string") && r.hasType("string"))
return makeBoolean(l.primitiveValue().compareTo(r.primitiveValue()) > 0);
else if ((l.hasType("integer", "decimal", "unsignedInt", "positiveInt")) && (r.hasType("integer", "decimal", "unsignedInt", "positiveInt")))
return makeBoolean(new Double(l.primitiveValue()) > new Double(r.primitiveValue()));
else if ((l.hasType("date", "dateTime", "instant")) && (r.hasType("date", "dateTime", "instant")))
return makeBoolean(compareDateTimeElements(l, r) > 0);
else if ((l.hasType("time")) && (r.hasType("time")))
return makeBoolean(l.primitiveValue().compareTo(r.primitiveValue()) > 0);
} else if (left.size() == 1 && right.size() == 1 && left.get(0).fhirType().equals("Quantity") && right.get(0).fhirType().equals("Quantity") ) {
List lUnit = left.get(0).listChildrenByName("unit");
List rUnit = right.get(0).listChildrenByName("unit");
if (Base.compareDeep(lUnit, rUnit, true)) {
return opGreater(left.get(0).listChildrenByName("value"), right.get(0).listChildrenByName("value"));
} else {
throw new InternalErrorException("Canonical Comparison isn't done yet");
}
}
return new ArrayList();
}
private List opLessOrEqual(List left, List right) throws FHIRException {
if (left.size() == 1 && right.size() == 1 && left.get(0).isPrimitive() && right.get(0).isPrimitive()) {
Base l = left.get(0);
Base r = right.get(0);
if (l.hasType("string") && r.hasType("string"))
return makeBoolean(l.primitiveValue().compareTo(r.primitiveValue()) <= 0);
else if ((l.hasType("integer", "decimal", "unsignedInt", "positiveInt")) && (r.hasType("integer", "decimal", "unsignedInt", "positiveInt")))
return makeBoolean(new Double(l.primitiveValue()) <= new Double(r.primitiveValue()));
else if ((l.hasType("date", "dateTime", "instant")) && (r.hasType("date", "dateTime", "instant")))
return makeBoolean(compareDateTimeElements(l, r) <= 0);
else if ((l.hasType("time")) && (r.hasType("time")))
return makeBoolean(l.primitiveValue().compareTo(r.primitiveValue()) <= 0);
} else if (left.size() == 1 && right.size() == 1 && left.get(0).fhirType().equals("Quantity") && right.get(0).fhirType().equals("Quantity") ) {
List lUnits = left.get(0).listChildrenByName("unit");
String lunit = lUnits.size() == 1 ? lUnits.get(0).primitiveValue() : null;
List rUnits = right.get(0).listChildrenByName("unit");
String runit = rUnits.size() == 1 ? rUnits.get(0).primitiveValue() : null;
if ((lunit == null && runit == null) || lunit.equals(runit)) {
return opLessOrEqual(left.get(0).listChildrenByName("value"), right.get(0).listChildrenByName("value"));
} else {
throw new InternalErrorException("Canonical Comparison isn't done yet");
}
}
return new ArrayList();
}
private List opGreaterOrEqual(List left, List right) throws FHIRException {
if (left.size() == 1 && right.size() == 1 && left.get(0).isPrimitive() && right.get(0).isPrimitive()) {
Base l = left.get(0);
Base r = right.get(0);
if (l.hasType("string") && r.hasType("string"))
return makeBoolean(l.primitiveValue().compareTo(r.primitiveValue()) >= 0);
else if ((l.hasType("integer", "decimal", "unsignedInt", "positiveInt")) && (r.hasType("integer", "decimal", "unsignedInt", "positiveInt")))
return makeBoolean(new Double(l.primitiveValue()) >= new Double(r.primitiveValue()));
else if ((l.hasType("date", "dateTime", "instant")) && (r.hasType("date", "dateTime", "instant")))
return makeBoolean(compareDateTimeElements(l, r) >= 0);
else if ((l.hasType("time")) && (r.hasType("time")))
return makeBoolean(l.primitiveValue().compareTo(r.primitiveValue()) >= 0);
} else if (left.size() == 1 && right.size() == 1 && left.get(0).fhirType().equals("Quantity") && right.get(0).fhirType().equals("Quantity") ) {
List lUnit = left.get(0).listChildrenByName("unit");
List rUnit = right.get(0).listChildrenByName("unit");
if (Base.compareDeep(lUnit, rUnit, true)) {
return opGreaterOrEqual(left.get(0).listChildrenByName("value"), right.get(0).listChildrenByName("value"));
} else {
throw new InternalErrorException("Canonical Comparison isn't done yet");
}
}
return new ArrayList();
}
private int compareDateTimeElements(Base theL, Base theR) {
String dateLeftString = theL.primitiveValue();
if (length(dateLeftString) > 10) {
DateTimeType dateLeft = new DateTimeType(dateLeftString);
dateLeft.setTimeZoneZulu(true);
dateLeftString = dateLeft.getValueAsString();
}
String dateRightString = theR.primitiveValue();
if (length(dateRightString) > 10) {
DateTimeType dateRight = new DateTimeType(dateRightString);
dateRight.setTimeZoneZulu(true);
dateRightString = dateRight.getValueAsString();
}
return dateLeftString.compareTo(dateRightString);
}
private List opIn(List left, List right) {
boolean ans = true;
for (Base l : left) {
boolean f = false;
for (Base r : right)
if (doEquals(l, r)) {
f = true;
break;
}
if (!f) {
ans = false;
break;
}
}
return makeBoolean(ans);
}
private List opContains(List left, List right) {
boolean ans = true;
for (Base r : right) {
boolean f = false;
for (Base l : left)
if (doEquals(l, r)) {
f = true;
break;
}
if (!f) {
ans = false;
break;
}
}
return makeBoolean(ans);
}
private List opPlus(List left, List right) throws PathEngineException {
if (left.size() == 0)
throw new PathEngineException("Error performing +: left operand has no value");
if (left.size() > 1)
throw new PathEngineException("Error performing +: left operand has more than one value");
if (!left.get(0).isPrimitive())
throw new PathEngineException(String.format("Error performing +: left operand has the wrong type (%s)", left.get(0).fhirType()));
if (right.size() == 0)
throw new PathEngineException("Error performing +: right operand has no value");
if (right.size() > 1)
throw new PathEngineException("Error performing +: right operand has more than one value");
if (!right.get(0).isPrimitive())
throw new PathEngineException(String.format("Error performing +: right operand has the wrong type (%s)", right.get(0).fhirType()));
List result = new ArrayList();
Base l = left.get(0);
Base r = right.get(0);
if (l.hasType("string", "id", "code", "uri") && r.hasType("string", "id", "code", "uri"))
result.add(new StringType(l.primitiveValue() + r.primitiveValue()));
else if (l.hasType("integer") && r.hasType("integer"))
result.add(new IntegerType(Integer.parseInt(l.primitiveValue()) + Integer.parseInt(r.primitiveValue())));
else if (l.hasType("decimal", "integer") && r.hasType("decimal", "integer"))
result.add(new DecimalType(new BigDecimal(l.primitiveValue()).add(new BigDecimal(r.primitiveValue()))));
else
throw new PathEngineException(String.format("Error performing +: left and right operand have incompatible or illegal types (%s, %s)", left.get(0).fhirType(), right.get(0).fhirType()));
return result;
}
private List opTimes(List left, List right) throws PathEngineException {
if (left.size() == 0)
throw new PathEngineException("Error performing *: left operand has no value");
if (left.size() > 1)
throw new PathEngineException("Error performing *: left operand has more than one value");
if (!left.get(0).isPrimitive())
throw new PathEngineException(String.format("Error performing +: left operand has the wrong type (%s)", left.get(0).fhirType()));
if (right.size() == 0)
throw new PathEngineException("Error performing *: right operand has no value");
if (right.size() > 1)
throw new PathEngineException("Error performing *: right operand has more than one value");
if (!right.get(0).isPrimitive())
throw new PathEngineException(String.format("Error performing *: right operand has the wrong type (%s)", right.get(0).fhirType()));
List result = new ArrayList();
Base l = left.get(0);
Base r = right.get(0);
if (l.hasType("integer") && r.hasType("integer"))
result.add(new IntegerType(Integer.parseInt(l.primitiveValue()) * Integer.parseInt(r.primitiveValue())));
else if (l.hasType("decimal", "integer") && r.hasType("decimal", "integer"))
result.add(new DecimalType(new BigDecimal(l.primitiveValue()).multiply(new BigDecimal(r.primitiveValue()))));
else
throw new PathEngineException(String.format("Error performing *: left and right operand have incompatible or illegal types (%s, %s)", left.get(0).fhirType(), right.get(0).fhirType()));
return result;
}
private List opConcatenate(List left, List right) {
List result = new ArrayList();
result.add(new StringType(convertToString(left) + convertToString((right))));
return result;
}
private List opUnion(List left, List right) {
List result = new ArrayList();
for (Base item : left) {
if (!doContains(result, item))
result.add(item);
}
for (Base item : right) {
if (!doContains(result, item))
result.add(item);
}
return result;
}
private boolean doContains(List list, Base item) {
for (Base test : list)
if (doEquals(test, item))
return true;
return false;
}
private List opAnd(List left, List right) {
if (left.isEmpty() && right.isEmpty())
return new ArrayList();
else if (isBoolean(left, false) || isBoolean(right, false))
return makeBoolean(false);
else if (left.isEmpty() || right.isEmpty())
return new ArrayList();
else if (convertToBoolean(left) && convertToBoolean(right))
return makeBoolean(true);
else
return makeBoolean(false);
}
private boolean isBoolean(List list, boolean b) {
return list.size() == 1 && list.get(0) instanceof BooleanType && ((BooleanType) list.get(0)).booleanValue() == b;
}
private List opOr(List left, List right) {
if (left.isEmpty() && right.isEmpty())
return new ArrayList();
else if (convertToBoolean(left) || convertToBoolean(right))
return makeBoolean(true);
else if (left.isEmpty() || right.isEmpty())
return new ArrayList();
else
return makeBoolean(false);
}
private List opXor(List left, List right) {
if (left.isEmpty() || right.isEmpty())
return new ArrayList();
else
return makeBoolean(convertToBoolean(left) ^ convertToBoolean(right));
}
private List opImplies(List left, List right) {
if (!convertToBoolean(left))
return makeBoolean(true);
else if (right.size() == 0)
return new ArrayList();
else
return makeBoolean(convertToBoolean(right));
}
private List opMinus(List left, List right) throws PathEngineException {
if (left.size() == 0)
throw new PathEngineException("Error performing -: left operand has no value");
if (left.size() > 1)
throw new PathEngineException("Error performing -: left operand has more than one value");
if (!left.get(0).isPrimitive())
throw new PathEngineException(String.format("Error performing -: left operand has the wrong type (%s)", left.get(0).fhirType()));
if (right.size() == 0)
throw new PathEngineException("Error performing -: right operand has no value");
if (right.size() > 1)
throw new PathEngineException("Error performing -: right operand has more than one value");
if (!right.get(0).isPrimitive())
throw new PathEngineException(String.format("Error performing -: right operand has the wrong type (%s)", right.get(0).fhirType()));
List result = new ArrayList();
Base l = left.get(0);
Base r = right.get(0);
if (l.hasType("integer") && r.hasType("integer"))
result.add(new IntegerType(Integer.parseInt(l.primitiveValue()) - Integer.parseInt(r.primitiveValue())));
else if (l.hasType("decimal", "integer") && r.hasType("decimal", "integer"))
result.add(new DecimalType(new BigDecimal(l.primitiveValue()).subtract(new BigDecimal(r.primitiveValue()))));
else
throw new PathEngineException(String.format("Error performing -: left and right operand have incompatible or illegal types (%s, %s)", left.get(0).fhirType(), right.get(0).fhirType()));
return result;
}
private List opDivideBy(List left, List right) throws PathEngineException {
if (left.size() == 0)
throw new PathEngineException("Error performing /: left operand has no value");
if (left.size() > 1)
throw new PathEngineException("Error performing /: left operand has more than one value");
if (!left.get(0).isPrimitive())
throw new PathEngineException(String.format("Error performing -: left operand has the wrong type (%s)", left.get(0).fhirType()));
if (right.size() == 0)
throw new PathEngineException("Error performing /: right operand has no value");
if (right.size() > 1)
throw new PathEngineException("Error performing /: right operand has more than one value");
if (!right.get(0).isPrimitive())
throw new PathEngineException(String.format("Error performing /: right operand has the wrong type (%s)", right.get(0).fhirType()));
List result = new ArrayList();
Base l = left.get(0);
Base r = right.get(0);
if (l.hasType("integer", "decimal", "unsignedInt", "positiveInt") && r.hasType("integer", "decimal", "unsignedInt", "positiveInt")) {
Decimal d1;
try {
d1 = new Decimal(l.primitiveValue());
Decimal d2 = new Decimal(r.primitiveValue());
result.add(new DecimalType(d1.divide(d2).asDecimal()));
} catch (UcumException e) {
throw new PathEngineException(e);
}
}
else
throw new PathEngineException(String.format("Error performing /: left and right operand have incompatible or illegal types (%s, %s)", left.get(0).fhirType(), right.get(0).fhirType()));
return result;
}
private List opDiv(List left, List right) throws PathEngineException {
if (left.size() == 0)
throw new PathEngineException("Error performing div: left operand has no value");
if (left.size() > 1)
throw new PathEngineException("Error performing div: left operand has more than one value");
if (!left.get(0).isPrimitive())
throw new PathEngineException(String.format("Error performing div: left operand has the wrong type (%s)", left.get(0).fhirType()));
if (right.size() == 0)
throw new PathEngineException("Error performing div: right operand has no value");
if (right.size() > 1)
throw new PathEngineException("Error performing div: right operand has more than one value");
if (!right.get(0).isPrimitive())
throw new PathEngineException(String.format("Error performing div: right operand has the wrong type (%s)", right.get(0).fhirType()));
List result = new ArrayList();
Base l = left.get(0);
Base r = right.get(0);
if (l.hasType("integer") && r.hasType("integer"))
result.add(new IntegerType(Integer.parseInt(l.primitiveValue()) / Integer.parseInt(r.primitiveValue())));
else if (l.hasType("decimal", "integer") && r.hasType("decimal", "integer")) {
Decimal d1;
try {
d1 = new Decimal(l.primitiveValue());
Decimal d2 = new Decimal(r.primitiveValue());
result.add(new IntegerType(d1.divInt(d2).asDecimal()));
} catch (UcumException e) {
throw new PathEngineException(e);
}
}
else
throw new PathEngineException(String.format("Error performing div: left and right operand have incompatible or illegal types (%s, %s)", left.get(0).fhirType(), right.get(0).fhirType()));
return result;
}
private List opMod(List left, List right) throws PathEngineException {
if (left.size() == 0)
throw new PathEngineException("Error performing mod: left operand has no value");
if (left.size() > 1)
throw new PathEngineException("Error performing mod: left operand has more than one value");
if (!left.get(0).isPrimitive())
throw new PathEngineException(String.format("Error performing mod: left operand has the wrong type (%s)", left.get(0).fhirType()));
if (right.size() == 0)
throw new PathEngineException("Error performing mod: right operand has no value");
if (right.size() > 1)
throw new PathEngineException("Error performing mod: right operand has more than one value");
if (!right.get(0).isPrimitive())
throw new PathEngineException(String.format("Error performing mod: right operand has the wrong type (%s)", right.get(0).fhirType()));
List result = new ArrayList();
Base l = left.get(0);
Base r = right.get(0);
if (l.hasType("integer") && r.hasType("integer"))
result.add(new IntegerType(Integer.parseInt(l.primitiveValue()) % Integer.parseInt(r.primitiveValue())));
else if (l.hasType("decimal", "integer") && r.hasType("decimal", "integer")) {
Decimal d1;
try {
d1 = new Decimal(l.primitiveValue());
Decimal d2 = new Decimal(r.primitiveValue());
result.add(new DecimalType(d1.modulo(d2).asDecimal()));
} catch (UcumException e) {
throw new PathEngineException(e);
}
}
else
throw new PathEngineException(String.format("Error performing mod: left and right operand have incompatible or illegal types (%s, %s)", left.get(0).fhirType(), right.get(0).fhirType()));
return result;
}
private TypeDetails readConstantType(ExecutionTypeContext context, String constant) throws PathEngineException {
if (constant.equals("true"))
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
else if (constant.equals("false"))
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
else if (Utilities.isInteger(constant))
return new TypeDetails(CollectionStatus.SINGLETON, "integer");
else if (Utilities.isDecimal(constant))
return new TypeDetails(CollectionStatus.SINGLETON, "decimal");
else if (constant.startsWith("%"))
return resolveConstantType(context, constant);
else
return new TypeDetails(CollectionStatus.SINGLETON, "string");
}
private TypeDetails resolveConstantType(ExecutionTypeContext context, String s) throws PathEngineException {
if (s.equals("%sct"))
return new TypeDetails(CollectionStatus.SINGLETON, "string");
else if (s.equals("%loinc"))
return new TypeDetails(CollectionStatus.SINGLETON, "string");
else if (s.equals("%ucum"))
return new TypeDetails(CollectionStatus.SINGLETON, "string");
else if (s.equals("%resource")) {
if (context.resource == null)
throw new PathEngineException("%resource cannot be used in this context");
return new TypeDetails(CollectionStatus.SINGLETON, context.resource);
} else if (s.equals("%context")) {
return new TypeDetails(CollectionStatus.SINGLETON, context.context);
} else if (s.equals("%map-codes"))
return new TypeDetails(CollectionStatus.SINGLETON, "string");
else if (s.equals("%us-zip"))
return new TypeDetails(CollectionStatus.SINGLETON, "string");
else if (s.startsWith("%\"vs-"))
return new TypeDetails(CollectionStatus.SINGLETON, "string");
else if (s.startsWith("%\"cs-"))
return new TypeDetails(CollectionStatus.SINGLETON, "string");
else if (s.startsWith("%\"ext-"))
return new TypeDetails(CollectionStatus.SINGLETON, "string");
else if (hostServices == null)
throw new PathEngineException("Unknown fixed constant type for '"+s+"'");
else
return hostServices.resolveConstantType(context.appInfo, s);
}
private List execute(ExecutionContext context, Base item, ExpressionNode exp, boolean atEntry) throws FHIRException {
List result = new ArrayList();
if (atEntry && Character.isUpperCase(exp.getName().charAt(0))) {// special case for start up
if (item.isResource() && item.fhirType().equals(exp.getName()))
result.add(item);
} else
getChildrenByName(item, exp.getName(), result);
if (result.size() == 0 && atEntry && context.appInfo != null) {
Base temp = hostServices.resolveConstant(context.appInfo, exp.getName());
if (temp != null) {
result.add(temp);
}
}
return result;
}
private TypeDetails executeContextType(ExecutionTypeContext context, String name) throws PathEngineException, DefinitionException {
if (hostServices == null)
throw new PathEngineException("Unable to resolve context reference since no host services are provided");
return hostServices.resolveConstantType(context.appInfo, name);
}
private TypeDetails executeType(String type, ExpressionNode exp, boolean atEntry) throws PathEngineException, DefinitionException {
if (atEntry && Character.isUpperCase(exp.getName().charAt(0)) && tail(type).equals(exp.getName())) // special case for start up
return new TypeDetails(CollectionStatus.SINGLETON, type);
TypeDetails result = new TypeDetails(null);
getChildTypesByName(type, exp.getName(), result);
return result;
}
private String tail(String type) {
return type.contains("#") ? "" : type.substring(type.lastIndexOf("/")+1);
}
@SuppressWarnings("unchecked")
private TypeDetails evaluateFunctionType(ExecutionTypeContext context, TypeDetails focus, ExpressionNode exp) throws PathEngineException, DefinitionException {
List paramTypes = new ArrayList();
if (exp.getFunction() == Function.Is || exp.getFunction() == Function.As)
paramTypes.add(new TypeDetails(CollectionStatus.SINGLETON, "string"));
else
for (ExpressionNode expr : exp.getParameters()) {
if (exp.getFunction() == Function.Where || exp.getFunction() == Function.Select || exp.getFunction() == Function.Repeat)
paramTypes.add(executeType(changeThis(context, focus), focus, expr, true));
else
paramTypes.add(executeType(context, focus, expr, true));
}
switch (exp.getFunction()) {
case Empty :
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case Not :
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case Exists :
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case SubsetOf : {
checkParamTypes(exp.getFunction().toCode(), paramTypes, focus);
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
}
case SupersetOf : {
checkParamTypes(exp.getFunction().toCode(), paramTypes, focus);
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
}
case IsDistinct :
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case Distinct :
return focus;
case Count :
return new TypeDetails(CollectionStatus.SINGLETON, "integer");
case Where :
return focus;
case Select :
return anything(focus.getCollectionStatus());
case All :
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case Repeat :
return anything(focus.getCollectionStatus());
case Item : {
checkOrdered(focus, "item");
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "integer"));
return focus;
}
case As : {
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"));
return new TypeDetails(CollectionStatus.SINGLETON, exp.getParameters().get(0).getName());
}
case Is : {
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"));
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
}
case Single :
return focus.toSingleton();
case First : {
checkOrdered(focus, "first");
return focus.toSingleton();
}
case Last : {
checkOrdered(focus, "last");
return focus.toSingleton();
}
case Tail : {
checkOrdered(focus, "tail");
return focus;
}
case Skip : {
checkOrdered(focus, "skip");
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "integer"));
return focus;
}
case Take : {
checkOrdered(focus, "take");
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "integer"));
return focus;
}
case Iif : {
TypeDetails types = new TypeDetails(null);
types.update(paramTypes.get(0));
if (paramTypes.size() > 1)
types.update(paramTypes.get(1));
return types;
}
case ToInteger : {
checkContextPrimitive(focus, "toInteger");
return new TypeDetails(CollectionStatus.SINGLETON, "integer");
}
case ToDecimal : {
checkContextPrimitive(focus, "toDecimal");
return new TypeDetails(CollectionStatus.SINGLETON, "decimal");
}
case ToString : {
checkContextPrimitive(focus, "toString");
return new TypeDetails(CollectionStatus.SINGLETON, "string");
}
case Substring : {
checkContextString(focus, "subString");
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "integer"), new TypeDetails(CollectionStatus.SINGLETON, "integer"));
return new TypeDetails(CollectionStatus.SINGLETON, "string");
}
case StartsWith : {
checkContextString(focus, "startsWith");
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"));
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
}
case EndsWith : {
checkContextString(focus, "endsWith");
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"));
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
}
case Matches : {
checkContextString(focus, "matches");
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"));
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
}
case ReplaceMatches : {
checkContextString(focus, "replaceMatches");
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"), new TypeDetails(CollectionStatus.SINGLETON, "string"));
return new TypeDetails(CollectionStatus.SINGLETON, "string");
}
case Contains : {
checkContextString(focus, "contains");
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"));
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
}
case Replace : {
checkContextString(focus, "replace");
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"), new TypeDetails(CollectionStatus.SINGLETON, "string"));
return new TypeDetails(CollectionStatus.SINGLETON, "string");
}
case Length : {
checkContextPrimitive(focus, "length");
return new TypeDetails(CollectionStatus.SINGLETON, "integer");
}
case Children :
return childTypes(focus, "*");
case Descendants :
return childTypes(focus, "**");
case MemberOf : {
checkContextCoded(focus, "memberOf");
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"));
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
}
case Trace : {
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"));
return focus;
}
case Today :
return new TypeDetails(CollectionStatus.SINGLETON, "date");
case Now :
return new TypeDetails(CollectionStatus.SINGLETON, "dateTime");
case Resolve : {
checkContextReference(focus, "resolve");
return new TypeDetails(CollectionStatus.SINGLETON, "DomainResource");
}
case Extension : {
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"));
return new TypeDetails(CollectionStatus.SINGLETON, "Extension");
}
case HasValue :
return new TypeDetails(CollectionStatus.SINGLETON, "boolean");
case Alias :
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"));
return anything(CollectionStatus.SINGLETON);
case AliasAs :
checkParamTypes(exp.getFunction().toCode(), paramTypes, new TypeDetails(CollectionStatus.SINGLETON, "string"));
return focus;
case Custom : {
return hostServices.checkFunction(context.appInfo, exp.getName(), paramTypes);
}
default:
break;
}
throw new Error("not Implemented yet");
}
private void checkParamTypes(String funcName, List paramTypes, TypeDetails... typeSet) throws PathEngineException {
int i = 0;
for (TypeDetails pt : typeSet) {
if (i == paramTypes.size())
return;
TypeDetails actual = paramTypes.get(i);
i++;
for (String a : actual.getTypes()) {
if (!pt.hasType(worker, a))
throw new PathEngineException("The parameter type '"+a+"' is not legal for "+funcName+" parameter "+Integer.toString(i)+". expecting "+pt.toString());
}
}
}
private void checkOrdered(TypeDetails focus, String name) throws PathEngineException {
if (focus.getCollectionStatus() == CollectionStatus.UNORDERED)
throw new PathEngineException("The function '"+name+"'() can only be used on ordered collections");
}
private void checkContextReference(TypeDetails focus, String name) throws PathEngineException {
if (!focus.hasType(worker, "string") && !focus.hasType(worker, "uri") && !focus.hasType(worker, "Reference"))
throw new PathEngineException("The function '"+name+"'() can only be used on string, uri, Reference");
}
private void checkContextCoded(TypeDetails focus, String name) throws PathEngineException {
if (!focus.hasType(worker, "string") && !focus.hasType(worker, "code") && !focus.hasType(worker, "uri") && !focus.hasType(worker, "Coding") && !focus.hasType(worker, "CodeableConcept"))
throw new PathEngineException("The function '"+name+"'() can only be used on string, code, uri, Coding, CodeableConcept");
}
private void checkContextString(TypeDetails focus, String name) throws PathEngineException {
if (!focus.hasType(worker, "string") && !focus.hasType(worker, "code") && !focus.hasType(worker, "uri") && !focus.hasType(worker, "id"))
throw new PathEngineException("The function '"+name+"'() can only be used on string, uri, code, id, but found "+focus.describe());
}
private void checkContextPrimitive(TypeDetails focus, String name) throws PathEngineException {
if (!focus.hasType(primitiveTypes))
throw new PathEngineException("The function '"+name+"'() can only be used on "+primitiveTypes.toString());
}
private TypeDetails childTypes(TypeDetails focus, String mask) throws PathEngineException, DefinitionException {
TypeDetails result = new TypeDetails(CollectionStatus.UNORDERED);
for (String f : focus.getTypes())
getChildTypesByName(f, mask, result);
return result;
}
private TypeDetails anything(CollectionStatus status) {
return new TypeDetails(status, allTypes.keySet());
}
// private boolean isPrimitiveType(String s) {
// return s.equals("boolean") || s.equals("integer") || s.equals("decimal") || s.equals("base64Binary") || s.equals("instant") || s.equals("string") || s.equals("uri") || s.equals("date") || s.equals("dateTime") || s.equals("time") || s.equals("code") || s.equals("oid") || s.equals("id") || s.equals("unsignedInt") || s.equals("positiveInt") || s.equals("markdown");
// }
private List evaluateFunction(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
switch (exp.getFunction()) {
case Empty : return funcEmpty(context, focus, exp);
case Not : return funcNot(context, focus, exp);
case Exists : return funcExists(context, focus, exp);
case SubsetOf : return funcSubsetOf(context, focus, exp);
case SupersetOf : return funcSupersetOf(context, focus, exp);
case IsDistinct : return funcIsDistinct(context, focus, exp);
case Distinct : return funcDistinct(context, focus, exp);
case Count : return funcCount(context, focus, exp);
case Where : return funcWhere(context, focus, exp);
case Select : return funcSelect(context, focus, exp);
case All : return funcAll(context, focus, exp);
case Repeat : return funcRepeat(context, focus, exp);
case Item : return funcItem(context, focus, exp);
case As : return funcAs(context, focus, exp);
case Is : return funcIs(context, focus, exp);
case Single : return funcSingle(context, focus, exp);
case First : return funcFirst(context, focus, exp);
case Last : return funcLast(context, focus, exp);
case Tail : return funcTail(context, focus, exp);
case Skip : return funcSkip(context, focus, exp);
case Take : return funcTake(context, focus, exp);
case Iif : return funcIif(context, focus, exp);
case ToInteger : return funcToInteger(context, focus, exp);
case ToDecimal : return funcToDecimal(context, focus, exp);
case ToString : return funcToString(context, focus, exp);
case Substring : return funcSubstring(context, focus, exp);
case StartsWith : return funcStartsWith(context, focus, exp);
case EndsWith : return funcEndsWith(context, focus, exp);
case Matches : return funcMatches(context, focus, exp);
case ReplaceMatches : return funcReplaceMatches(context, focus, exp);
case Contains : return funcContains(context, focus, exp);
case Replace : return funcReplace(context, focus, exp);
case Length : return funcLength(context, focus, exp);
case Children : return funcChildren(context, focus, exp);
case Descendants : return funcDescendants(context, focus, exp);
case MemberOf : return funcMemberOf(context, focus, exp);
case Trace : return funcTrace(context, focus, exp);
case Today : return funcToday(context, focus, exp);
case Now : return funcNow(context, focus, exp);
case Resolve : return funcResolve(context, focus, exp);
case Extension : return funcExtension(context, focus, exp);
case HasValue : return funcHasValue(context, focus, exp);
case AliasAs : return funcAliasAs(context, focus, exp);
case Alias : return funcAlias(context, focus, exp);
case Custom: {
List> params = new ArrayList>();
for (ExpressionNode p : exp.getParameters())
params.add(execute(context, focus, p, true));
return hostServices.executeFunction(context.appInfo, exp.getName(), params);
}
default:
throw new Error("not Implemented yet");
}
}
private List funcAliasAs(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List nl = execute(context, focus, exp.getParameters().get(0), true);
String name = nl.get(0).primitiveValue();
context.addAlias(name, focus);
return focus;
}
private List funcAlias(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List nl = execute(context, focus, exp.getParameters().get(0), true);
String name = nl.get(0).primitiveValue();
List res = new ArrayList();
Base b = context.getAlias(name);
if (b != null)
res.add(b);
return res;
}
private List funcAll(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
if (exp.getParameters().size() == 1) {
List result = new ArrayList();
List pc = new ArrayList();
boolean all = true;
for (Base item : focus) {
pc.clear();
pc.add(item);
if (!convertToBoolean(execute(changeThis(context, item), pc, exp.getParameters().get(0), true))) {
all = false;
break;
}
}
result.add(new BooleanType(all));
return result;
} else {// (exp.getParameters().size() == 0) {
List result = new ArrayList();
boolean all = true;
for (Base item : focus) {
boolean v = false;
if (item instanceof BooleanType) {
v = ((BooleanType) item).booleanValue();
} else
v = item != null;
if (!v) {
all = false;
break;
}
}
result.add(new BooleanType(all));
return result;
}
}
private ExecutionContext changeThis(ExecutionContext context, Base newThis) {
return new ExecutionContext(context.appInfo, context.resource, context.context, context.aliases, newThis);
}
private ExecutionTypeContext changeThis(ExecutionTypeContext context, TypeDetails newThis) {
return new ExecutionTypeContext(context.appInfo, context.resource, context.context, newThis);
}
private List funcNow(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
result.add(DateTimeType.now());
return result;
}
private List funcToday(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
result.add(new DateType(new Date(), TemporalPrecisionEnum.DAY));
return result;
}
private List funcMemberOf(ExecutionContext context, List focus, ExpressionNode exp) {
throw new Error("not Implemented yet");
}
private List funcDescendants(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
List current = new ArrayList();
current.addAll(focus);
List added = new ArrayList();
boolean more = true;
while (more) {
added.clear();
for (Base item : current) {
getChildrenByName(item, "*", added);
}
more = !added.isEmpty();
result.addAll(added);
current.clear();
current.addAll(added);
}
return result;
}
private List funcChildren(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
for (Base b : focus)
getChildrenByName(b, "*", result);
return result;
}
private List funcReplace(ExecutionContext context, List focus, ExpressionNode exp) {
throw new Error("not Implemented yet");
}
private List funcReplaceMatches(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
String sw = convertToString(execute(context, focus, exp.getParameters().get(0), true));
if (focus.size() == 1 && !Utilities.noString(sw))
result.add(new BooleanType(convertToString(focus.get(0)).contains(sw)));
else
result.add(new BooleanType(false));
return result;
}
private List funcEndsWith(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
String sw = convertToString(execute(context, focus, exp.getParameters().get(0), true));
if (focus.size() == 1 && !Utilities.noString(sw))
result.add(new BooleanType(convertToString(focus.get(0)).endsWith(sw)));
else
result.add(new BooleanType(false));
return result;
}
private List funcToString(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
result.add(new StringType(convertToString(focus)));
return result;
}
private List funcToDecimal(ExecutionContext context, List focus, ExpressionNode exp) {
String s = convertToString(focus);
List result = new ArrayList();
if (Utilities.isDecimal(s))
result.add(new DecimalType(s));
return result;
}
private List funcIif(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List n1 = execute(context, focus, exp.getParameters().get(0), true);
Boolean v = convertToBoolean(n1);
if (v)
return execute(context, focus, exp.getParameters().get(1), true);
else if (exp.getParameters().size() < 3)
return new ArrayList();
else
return execute(context, focus, exp.getParameters().get(2), true);
}
private List funcTake(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List n1 = execute(context, focus, exp.getParameters().get(0), true);
int i1 = Integer.parseInt(n1.get(0).primitiveValue());
List result = new ArrayList();
for (int i = 0; i < Math.min(focus.size(), i1); i++)
result.add(focus.get(i));
return result;
}
private List funcSingle(ExecutionContext context, List focus, ExpressionNode exp) throws PathEngineException {
if (focus.size() == 1)
return focus;
throw new PathEngineException(String.format("Single() : checking for 1 item but found %d items", focus.size()));
}
private List funcIs(ExecutionContext context, List focus, ExpressionNode exp) throws PathEngineException {
List result = new ArrayList();
if (focus.size() == 0 || focus.size() > 1)
result.add(new BooleanType(false));
else {
String tn = exp.getParameters().get(0).getName();
result.add(new BooleanType(focus.get(0).hasType(tn)));
}
return result;
}
private List funcAs(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
String tn = exp.getParameters().get(0).getName();
for (Base b : focus)
if (b.hasType(tn))
result.add(b);
return result;
}
private List funcRepeat(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
List current = new ArrayList();
current.addAll(focus);
List added = new ArrayList();
boolean more = true;
while (more) {
added.clear();
List pc = new ArrayList();
for (Base item : current) {
pc.clear();
pc.add(item);
added.addAll(execute(changeThis(context, item), pc, exp.getParameters().get(0), false));
}
more = !added.isEmpty();
result.addAll(added);
current.clear();
current.addAll(added);
}
return result;
}
private List funcIsDistinct(ExecutionContext context, List focus, ExpressionNode exp) {
if (focus.size() <= 1)
return makeBoolean(true);
boolean distinct = true;
for (int i = 0; i < focus.size(); i++) {
for (int j = i+1; j < focus.size(); j++) {
if (doEquals(focus.get(j), focus.get(i))) {
distinct = false;
break;
}
}
}
return makeBoolean(distinct);
}
private List funcSupersetOf(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List target = execute(context, focus, exp.getParameters().get(0), true);
boolean valid = true;
for (Base item : target) {
boolean found = false;
for (Base t : focus) {
if (Base.compareDeep(item, t, false)) {
found = true;
break;
}
}
if (!found) {
valid = false;
break;
}
}
List result = new ArrayList();
result.add(new BooleanType(valid));
return result;
}
private List funcSubsetOf(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List target = execute(context, focus, exp.getParameters().get(0), true);
boolean valid = true;
for (Base item : focus) {
boolean found = false;
for (Base t : target) {
if (Base.compareDeep(item, t, false)) {
found = true;
break;
}
}
if (!found) {
valid = false;
break;
}
}
List result = new ArrayList();
result.add(new BooleanType(valid));
return result;
}
private List funcExists(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
result.add(new BooleanType(!ElementUtil.isEmpty(focus)));
return result;
}
private List funcResolve(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
for (Base item : focus) {
if (hostServices != null) {
String s = convertToString(item);
if (item.fhirType().equals("Reference")) {
Property p = item.getChildByName("reference");
if (p.hasValues())
s = convertToString(p.getValues().get(0));
}
Base res = null;
if (s.startsWith("#")) {
String id = s.substring(1);
Property p = context.resource.getChildByName("contained");
for (Base c : p.getValues()) {
if (id.equals(c.getIdBase()))
res = c;
}
} else
res = hostServices.resolveReference(context.appInfo, s);
if (res != null)
result.add(res);
}
}
return result;
}
private List funcExtension(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
List nl = execute(context, focus, exp.getParameters().get(0), true);
String url = nl.get(0).primitiveValue();
for (Base item : focus) {
List ext = new ArrayList();
getChildrenByName(item, "extension", ext);
getChildrenByName(item, "modifierExtension", ext);
for (Base ex : ext) {
List vl = new ArrayList();
getChildrenByName(ex, "url", vl);
if (convertToString(vl).equals(url))
result.add(ex);
}
}
return result;
}
private List funcTrace(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List nl = execute(context, focus, exp.getParameters().get(0), true);
String name = nl.get(0).primitiveValue();
log(name, focus);
return focus;
}
private List funcDistinct(ExecutionContext context, List focus, ExpressionNode exp) {
if (focus.size() <= 1)
return focus;
List result = new ArrayList();
for (int i = 0; i < focus.size(); i++) {
boolean found = false;
for (int j = i+1; j < focus.size(); j++) {
if (doEquals(focus.get(j), focus.get(i))) {
found = true;
break;
}
}
if (!found)
result.add(focus.get(i));
}
return result;
}
private List funcMatches(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
String sw = convertToString(execute(context, focus, exp.getParameters().get(0), true));
if (focus.size() == 1 && !Utilities.noString(sw)) {
String st = convertToString(focus.get(0));
if (Utilities.noString(st))
result.add(new BooleanType(false));
else
result.add(new BooleanType(st.matches(sw)));
} else
result.add(new BooleanType(false));
return result;
}
private List funcContains(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
String sw = convertToString(execute(context, focus, exp.getParameters().get(0), true));
if (focus.size() == 1 && !Utilities.noString(sw)) {
String st = convertToString(focus.get(0));
if (Utilities.noString(st))
result.add(new BooleanType(false));
else
result.add(new BooleanType(st.contains(sw)));
} else
result.add(new BooleanType(false));
return result;
}
private List funcLength(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
if (focus.size() == 1) {
String s = convertToString(focus.get(0));
result.add(new IntegerType(s.length()));
}
return result;
}
private List funcHasValue(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
if (focus.size() == 1) {
String s = convertToString(focus.get(0));
result.add(new BooleanType(!Utilities.noString(s)));
}
return result;
}
private List funcStartsWith(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
String sw = convertToString(execute(context, focus, exp.getParameters().get(0), true));
if (focus.size() == 1 && !Utilities.noString(sw))
result.add(new BooleanType(convertToString(focus.get(0)).startsWith(sw)));
else
result.add(new BooleanType(false));
return result;
}
private List funcSubstring(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
List n1 = execute(context, focus, exp.getParameters().get(0), true);
int i1 = Integer.parseInt(n1.get(0).primitiveValue());
int i2 = -1;
if (exp.parameterCount() == 2) {
List n2 = execute(context, focus, exp.getParameters().get(1), true);
i2 = Integer.parseInt(n2.get(0).primitiveValue());
}
if (focus.size() == 1) {
String sw = convertToString(focus.get(0));
String s;
if (i1 < 0 || i1 >= sw.length())
return new ArrayList();
if (exp.parameterCount() == 2)
s = sw.substring(i1, Math.min(sw.length(), i1+i2));
else
s = sw.substring(i1);
if (!Utilities.noString(s))
result.add(new StringType(s));
}
return result;
}
private List funcToInteger(ExecutionContext context, List focus, ExpressionNode exp) {
String s = convertToString(focus);
List result = new ArrayList();
if (Utilities.isInteger(s))
result.add(new IntegerType(s));
return result;
}
private List funcCount(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
result.add(new IntegerType(focus.size()));
return result;
}
private List funcSkip(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List n1 = execute(context, focus, exp.getParameters().get(0), true);
int i1 = Integer.parseInt(n1.get(0).primitiveValue());
List result = new ArrayList();
for (int i = i1; i < focus.size(); i++)
result.add(focus.get(i));
return result;
}
private List funcTail(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
for (int i = 1; i < focus.size(); i++)
result.add(focus.get(i));
return result;
}
private List funcLast(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
if (focus.size() > 0)
result.add(focus.get(focus.size()-1));
return result;
}
private List funcFirst(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
if (focus.size() > 0)
result.add(focus.get(0));
return result;
}
private List funcWhere(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
List pc = new ArrayList();
for (Base item : focus) {
pc.clear();
pc.add(item);
if (convertToBoolean(execute(changeThis(context, item), pc, exp.getParameters().get(0), true)))
result.add(item);
}
return result;
}
private List funcSelect(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
List pc = new ArrayList();
for (Base item : focus) {
pc.clear();
pc.add(item);
result.addAll(execute(changeThis(context, item), pc, exp.getParameters().get(0), true));
}
return result;
}
private List funcItem(ExecutionContext context, List focus, ExpressionNode exp) throws FHIRException {
List result = new ArrayList();
String s = convertToString(execute(context, focus, exp.getParameters().get(0), true));
if (Utilities.isInteger(s) && Integer.parseInt(s) < focus.size())
result.add(focus.get(Integer.parseInt(s)));
return result;
}
private List funcEmpty(ExecutionContext context, List focus, ExpressionNode exp) {
List result = new ArrayList();
result.add(new BooleanType(ElementUtil.isEmpty(focus)));
return result;
}
private List funcNot(ExecutionContext context, List focus, ExpressionNode exp) {
return makeBoolean(!convertToBoolean(focus));
}
public class ElementDefinitionMatch {
private ElementDefinition definition;
private String fixedType;
public ElementDefinitionMatch(ElementDefinition definition, String fixedType) {
super();
this.definition = definition;
this.fixedType = fixedType;
}
public ElementDefinition getDefinition() {
return definition;
}
public String getFixedType() {
return fixedType;
}
}
private void getChildTypesByName(String type, String name, TypeDetails result) throws PathEngineException, DefinitionException {
if (Utilities.noString(type))
throw new PathEngineException("No type provided in BuildToolPathEvaluator.getChildTypesByName");
if (type.equals("http://hl7.org/fhir/StructureDefinition/xhtml"))
return;
String url = null;
if (type.contains("#")) {
url = type.substring(0, type.indexOf("#"));
} else {
url = type;
}
String tail = "";
StructureDefinition sd = worker.fetchResource(StructureDefinition.class, url);
if (sd == null)
throw new DefinitionException("Unknown type "+type); // this really is an error, because we can only get to here if the internal infrastrucgture is wrong
List sdl = new ArrayList();
ElementDefinitionMatch m = null;
if (type.contains("#"))
m = getElementDefinition(sd, type.substring(type.indexOf("#")+1), false);
if (m != null && hasDataType(m.definition)) {
if (m.fixedType != null)
{
StructureDefinition dt = worker.fetchResource(StructureDefinition.class, "http://hl7.org/fhir/StructureDefinition/"+m.fixedType);
if (dt == null)
throw new DefinitionException("unknown data type "+m.fixedType);
sdl.add(dt);
} else
for (TypeRefComponent t : m.definition.getType()) {
StructureDefinition dt = worker.fetchResource(StructureDefinition.class, "http://hl7.org/fhir/StructureDefinition/"+t.getCode());
if (dt == null)
throw new DefinitionException("unknown data type "+t.getCode());
sdl.add(dt);
}
} else {
sdl.add(sd);
if (type.contains("#")) {
tail = type.substring(type.indexOf("#")+1);
tail = tail.substring(tail.indexOf("."));
}
}
for (StructureDefinition sdi : sdl) {
String path = sdi.getSnapshot().getElement().get(0).getPath()+tail+".";
if (name.equals("**")) {
assert(result.getCollectionStatus() == CollectionStatus.UNORDERED);
for (ElementDefinition ed : sdi.getSnapshot().getElement()) {
if (ed.getPath().startsWith(path))
for (TypeRefComponent t : ed.getType()) {
if (t.hasCode() && t.getCodeElement().hasValue()) {
String tn = null;
if (t.getCode().equals("Element") || t.getCode().equals("BackboneElement"))
tn = sdi.getType()+"#"+ed.getPath();
else
tn = t.getCode();
if (t.getCode().equals("Resource")) {
for (String rn : worker.getResourceNames()) {
if (!result.hasType(worker, rn)) {
getChildTypesByName(result.addType(rn), "**", result);
}
}
} else if (!result.hasType(worker, tn)) {
getChildTypesByName(result.addType(tn), "**", result);
}
}
}
}
} else if (name.equals("*")) {
assert(result.getCollectionStatus() == CollectionStatus.UNORDERED);
for (ElementDefinition ed : sdi.getSnapshot().getElement()) {
if (ed.getPath().startsWith(path) && !ed.getPath().substring(path.length()).contains("."))
for (TypeRefComponent t : ed.getType()) {
if (t.getCode().equals("Element") || t.getCode().equals("BackboneElement"))
result.addType(sdi.getType()+"#"+ed.getPath());
else if (t.getCode().equals("Resource"))
result.addTypes(worker.getResourceNames());
else
result.addType(t.getCode());
}
}
} else {
path = sdi.getSnapshot().getElement().get(0).getPath()+tail+"."+name;
ElementDefinitionMatch ed = getElementDefinition(sdi, path, false);
if (ed != null) {
if (!Utilities.noString(ed.getFixedType()))
result.addType(ed.getFixedType());
else
for (TypeRefComponent t : ed.getDefinition().getType()) {
if (Utilities.noString(t.getCode()))
break; // throw new PathEngineException("Illegal reference to primitive value attribute @ "+path);
ProfiledType pt = null;
if (t.getCode().equals("Element") || t.getCode().equals("BackboneElement"))
pt = new ProfiledType(sdi.getUrl()+"#"+path);
else if (t.getCode().equals("Resource"))
result.addTypes(worker.getResourceNames());
else
pt = new ProfiledType(t.getCode());
if (pt != null) {
if (t.hasProfile())
pt.addProfile(t.getProfile());
if (ed.getDefinition().hasBinding())
pt.addBinding(ed.getDefinition().getBinding());
result.addType(pt);
}
}
}
}
}
}
private ElementDefinitionMatch getElementDefinition(StructureDefinition sd, String path, boolean allowTypedName) throws PathEngineException {
for (ElementDefinition ed : sd.getSnapshot().getElement()) {
if (ed.getPath().equals(path)) {
if (ed.hasContentReference()) {
return getElementDefinitionById(sd, ed.getContentReference());
} else
return new ElementDefinitionMatch(ed, null);
}
if (ed.getPath().endsWith("[x]") && path.startsWith(ed.getPath().substring(0, ed.getPath().length()-3)) && path.length() == ed.getPath().length()-3)
return new ElementDefinitionMatch(ed, null);
if (allowTypedName && ed.getPath().endsWith("[x]") && path.startsWith(ed.getPath().substring(0, ed.getPath().length()-3)) && path.length() > ed.getPath().length()-3) {
String s = Utilities.uncapitalize(path.substring(ed.getPath().length()-3));
if (primitiveTypes.contains(s))
return new ElementDefinitionMatch(ed, s);
else
return new ElementDefinitionMatch(ed, path.substring(ed.getPath().length()-3));
}
if (ed.getPath().contains(".") && path.startsWith(ed.getPath()+".") && (ed.getType().size() > 0) && !isAbstractType(ed.getType())) {
// now we walk into the type.
if (ed.getType().size() > 1) // if there's more than one type, the test above would fail this
throw new PathEngineException("Internal typing issue....");
StructureDefinition nsd = worker.fetchResource(StructureDefinition.class, "http://hl7.org/fhir/StructureDefinition/"+ed.getType().get(0).getCode());
if (nsd == null)
throw new PathEngineException("Unknown type "+ed.getType().get(0).getCode());
return getElementDefinition(nsd, nsd.getId()+path.substring(ed.getPath().length()), allowTypedName);
}
if (ed.hasContentReference() && path.startsWith(ed.getPath()+".")) {
ElementDefinitionMatch m = getElementDefinitionById(sd, ed.getContentReference());
return getElementDefinition(sd, m.definition.getPath()+path.substring(ed.getPath().length()), allowTypedName);
}
}
return null;
}
private boolean isAbstractType(List list) {
return list.size() != 1 ? true : Utilities.existsInList(list.get(0).getCode(), "Element", "BackboneElement", "Resource", "DomainResource");
}
private boolean hasType(ElementDefinition ed, String s) {
for (TypeRefComponent t : ed.getType())
if (s.equalsIgnoreCase(t.getCode()))
return true;
return false;
}
private boolean hasDataType(ElementDefinition ed) {
return ed.hasType() && !(ed.getType().get(0).getCode().equals("Element") || ed.getType().get(0).getCode().equals("BackboneElement"));
}
private ElementDefinitionMatch getElementDefinitionById(StructureDefinition sd, String ref) {
for (ElementDefinition ed : sd.getSnapshot().getElement()) {
if (ref.equals("#"+ed.getId()))
return new ElementDefinitionMatch(ed, null);
}
return null;
}
public boolean hasLog() {
return log != null && log.length() > 0;
}
public String takeLog() {
if (!hasLog())
return "";
String s = log.toString();
log = new StringBuilder();
return s;
}
}
