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package com.nedap.archie.rules.evaluation;
import com.google.common.collect.ArrayListMultimap;
import com.nedap.archie.aom.CPrimitiveObject;
import com.nedap.archie.aom.utils.AOMUtils;
import com.nedap.archie.query.RMObjectWithPath;
import com.nedap.archie.rules.BinaryOperator;
import com.nedap.archie.rules.Constraint;
import com.nedap.archie.rules.Expression;
import com.nedap.archie.rules.ForAllStatement;
import com.nedap.archie.rules.ModelReference;
import com.nedap.archie.rules.OperatorKind;
import com.nedap.archie.rules.PrimitiveType;
import com.nedap.archie.rules.RuleElement;
import com.nedap.archie.rules.UnaryOperator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
/**
* Checks evaluated assertions on what can be fixed automatically, and how this can be done.
*
* Created by pieter.bos on 18/05/16.
*/
class FixableAssertionsChecker {
private static Logger logger = LoggerFactory.getLogger(FixableAssertionsChecker.class);
private ArrayListMultimap ruleElementValues;
private VariableMap forAllVariables;
protected FixableAssertionsChecker(ArrayListMultimap ruleElementValues) {
this.ruleElementValues = ruleElementValues;
forAllVariables = new VariableMap();
}
/**
* Check the assertion result for patterns that can be automatically fixed so they evaluate to true. Currently the following patterns can be automatically fixed:
*
* /path/value = ...expression...
* .... implies _another matched pattern_
* exists .....
* not exists ....
* for all .. in ... satisfies _another matched pattern
*
*
* @param assertionResult the evaluationresult to set the fix instructions to
* @param expression the expression to be evaluated
@param expression the current index, if in a for all expression. 0 (-1? TODO) otherwise
*/
protected void checkAssertionForFixablePatterns(AssertionResult assertionResult, Expression expression, int index) {
if(expression instanceof ForAllStatement) {
handleForAll(assertionResult, expression);
} else if (expression instanceof BinaryOperator) {
ValueList expressionResult = ruleElementValues.get(expression).get(index);
BinaryOperator binaryExpression = (BinaryOperator) expression;
if (binaryExpression.getOperator() == OperatorKind.eq && binaryExpression.getLeftOperand() instanceof ModelReference) {
handlePathEquals(assertionResult, expressionResult, binaryExpression, index);
} else if (binaryExpression.getOperator() == OperatorKind.implies) {
handleImplies(assertionResult, index, binaryExpression);
} else if (binaryExpression.getOperator() == OperatorKind.matches) {
handleMatches(assertionResult, index, binaryExpression);
} else if (binaryExpression.getOperator() == OperatorKind.and) {
checkAssertionForFixablePatterns(assertionResult, binaryExpression.getLeftOperand(), index);
checkAssertionForFixablePatterns(assertionResult, binaryExpression.getRightOperand(), index);
}
} else if (expression instanceof UnaryOperator) {
UnaryOperator unaryOperator = (UnaryOperator) expression;
if(unaryOperator.getOperator() == OperatorKind.not) {
handleNot(assertionResult, unaryOperator, index);
}
if (unaryOperator.getOperator() == OperatorKind.exists) {
//TODO exists expressions
if (unaryOperator.getOperand() instanceof ModelReference) { //TODO: this could also be an objectreference
//matches exists /path/to/value
//TODO: this shows that a specific archetype path must exist. But it could just as well be a path within a specific node. So find a way to get the RM Path
//pointing to the right node here
assertionResult.addPathThatMustExist(resolveModelReference((ModelReference) unaryOperator.getOperand()));
}
}
}
//TODO: not expressions, reversing the expected value?
}
private void handleNot(AssertionResult assertionResult, UnaryOperator unaryOperator, int index) {
Expression operand = unaryOperator.getOperand();
if(operand instanceof UnaryOperator && ((UnaryOperator) operand).getOperator() == OperatorKind.exists) {
UnaryOperator existsOperator = (UnaryOperator) operand;
if(existsOperator.getOperand() instanceof ModelReference) { //TODO: this could also be an objectreference
//matches exists /path/to/value
List valueLists = ruleElementValues.get(existsOperator);
ValueList list = valueLists.get(index);
if(list.getSingleBooleanResult()) { //it exists. It should not
assertionResult.addPathsThatMustNotExist(resolveModelReferenceNonNull((ModelReference) existsOperator.getOperand(), index));
} else { //does not exist, it's fine but we should still know. We need another model reference lookup method
assertionResult.addPathThatMustNotExist(resolveModelReference((ModelReference) existsOperator.getOperand()));
}
}
}
}
private void handleImplies(AssertionResult assertionResult, int index, BinaryOperator binaryExpression) {
//matches ... implies ...
ValueList leftOperandResult = ruleElementValues.get(binaryExpression.getLeftOperand()).get(index);
if(!leftOperandResult.isEmpty()) { //if the left operand cannot be evaluated, do not attempt to fix anything
boolean shouldEvaluate = leftOperandResult.getSingleBooleanResult();
if (shouldEvaluate) {
checkAssertionForFixablePatterns(assertionResult, binaryExpression.getRightOperand(), index);
}
}
}
private void handlePathEquals(AssertionResult assertionResult, ValueList expressionResult, BinaryOperator binaryExpression, int index) {
//matches the form /path/to/something = 3 + 5 * /value[id23]
ValueList valueList = this.ruleElementValues.get(binaryExpression.getRightOperand()).get(index);
ModelReference pathToSet = (ModelReference) binaryExpression.getLeftOperand();
setPathsToValues(assertionResult, resolveModelReference(pathToSet), valueList);
}
private void handleMatches(AssertionResult assertionResult, int index, BinaryOperator binaryExpression) {
// matches the form '/path matches {|at6|}' - only doing something is the constraint matches a constant value
Expression rightOperand = binaryExpression.getRightOperand();
ModelReference pathToSet = (ModelReference) binaryExpression.getLeftOperand();
if(rightOperand instanceof Constraint) {
Constraint c = (Constraint) rightOperand;
CPrimitiveObject object = c.getItem();
List constraints = object.getConstraint();
if(constraints.size() != 1) {
return;
}
ValueList valueList = new ValueList();
switch(object.getClass().getSimpleName()) {
case "CTerminologyCode": {
String constraint = (String) constraints.get(0);
if (AOMUtils.isValueCode(constraint)) {
valueList.addValue(constraint, Collections.emptyList());
String path = resolveModelReference(pathToSet);
if (path.endsWith("symbol")) { // different for DV_CODED_TEXT and DV_CODEPHRASE
/// it would be better to check the actual type, but hasn't been done now
//this limits this to the OpenEHR RM
path = path + "/defining_code/code_string";
} else {
path = path + "/code_string";
}
setPathsToValues(assertionResult, path, valueList);
} else if (AOMUtils.isValueSetCode(constraint)) {
String path = resolveModelReference(pathToSet);
assertionResult.constrainPathToValueSet(path, constraint);
}
break;
}
case "CString": {
String constraint = (String) constraints.get(0);
valueList.addValue(constraint, Collections.emptyList());
setPathsToValues(assertionResult, resolveModelReference(pathToSet), valueList);
}
break;
//TODO: more type of constraints
}
} else {
//cannot be evaluated?
}
}
private void handleForAll(AssertionResult assertionResult, Expression expression) {
//this handles forAll ..., even with an extra for all.
//TODO: the nested loop forall .. in .. forall .. in .. will not yet work due to problems with the ruleElementValues. Refactor!
ForAllStatement forAllStatement = (ForAllStatement) expression;
Collection valueLists = ruleElementValues.get(forAllStatement.getAssertion());
int i = 0;
ValueList pathExpressionValues = ruleElementValues.get(forAllStatement.getPathExpression()).get(0);
for(ValueList valueList:valueLists) {
//if(!valueList.getSingleBooleanResult()) {
//TODO: this code is a bit hard to understand
//set the variables to what they were during the for all evaluation.
//this is a bit of code duplication from the ForAllEvaluator. I think improvement is possible in this place
Value value = pathExpressionValues.get(i);
Object context = value.getValue();
String path = (String) value.getPaths().get(0);
// according to the latest openEHR docs, this should be 'objectreference'.
// We could change the name of the java class
RMObjectWithPath rmObjectWithPath = new RMObjectWithPath(context, path);
ValueList variableValue = new ValueList(rmObjectWithPath);
variableValue.setType(PrimitiveType.ObjectReference);
forAllVariables.put(forAllStatement.getVariableName(), variableValue);
checkAssertionForFixablePatterns(assertionResult, forAllStatement.getAssertion(), i);
i++;
}
forAllVariables.put(forAllStatement.getVariableName(), null);
}
private String resolveModelReference(ModelReference statement) {
String variable = statement.getVariableReferencePrefix();
String pathPrefix = "";
if(variable != null) {
//resolve variable and add path prefix
ValueList value = forAllVariables.get(variable);
if(value.size() > 1) {
throw new IllegalStateException("");
} else if (value.size() == 1) {
if(value.getType() == PrimitiveType.ObjectReference) {
RMObjectWithPath reference = (RMObjectWithPath) value.get(0).getValue();
pathPrefix = reference.getPath();
} else {
//TODO: this is not correct
if(value.get(0).getPaths().size() > 1) {
throw new IllegalStateException("");
}
pathPrefix = (String) value.get(0).getPaths().get(0);
}
} //0: do nothing, empty value, no path prefix
}
return pathPrefix + statement.getPath();
}
private List resolveModelReferenceNonNull(ModelReference statement, int index) {
List values = ruleElementValues.get(statement);
if(index > values.size()) {
return Collections.emptyList();
} else {
ValueList valueList = values.get(index);
return valueList.getAllPaths();
}
}
private void setPathsToValues(AssertionResult assertionResult, String path, ValueList value) {
logger.debug("path {} set to value {} ", path, value);
assertionResult.setSetPathValue(path, value);
}
}