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package org.jvnet.hk2.component.matcher;
import java.lang.reflect.Array;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
import org.jvnet.hk2.component.Constants;
import org.jvnet.hk2.component.MultiMap;
/**
* This thing filters things based on the input LDAP style string. Note that
* this is restricted LDAP, in that it only handles "&".
*
* @since 3.1
*/
public class SimpleLdapMatcher {
private static final char LEFT = '(';
private static final char RIGHT = ')';
private static final char AND = '&';
private static final char OR = '|';
private static final char EQ = '=';
private static final char NOT = '!';
private static final int UNKNOWN_TYPE = -1;
private static final int BASE_TYPE = 0;
private static final int AND_TYPE = 1;
private static final int OR_TYPE = 2;
private static final int NEST_TYPE = 3;
private static final int FALSE_TYPE = 4;
private final String originalLDAP;
private final Node topNode;
/* package */SimpleLdapMatcher(String paramOriginalLDAP) {
originalLDAP = paramOriginalLDAP;
if (originalLDAP != null) {
ActiveString workString = new ActiveString(paramOriginalLDAP);
topNode = parse(workString);
workString.finish();
} else {
topNode = new Node();
topNode.setType(FALSE_TYPE);
}
}
/* package */SimpleLdapMatcher(Node node) {
originalLDAP = null;
topNode = node;
}
public static SimpleLdapMatcher create(String ldapFilter) {
return new SimpleLdapMatcher(ldapFilter);
}
public static SimpleLdapMatcher create(Map props) {
Node node = new Node();
for (Entry entry : props.entrySet()) {
Node child = new Node(entry.getKey(), true, stringOf(entry.getValue()));
node.addChild(child);
}
return new SimpleLdapMatcher(node);
}
public static SimpleLdapMatcher createClassFilter(String clazzName) {
Map props = new HashMap();
props.put(Constants.OBJECTCLASS, clazzName);
return create(props);
}
private static String stringOf(Object obj) {
return (null == obj) ? null : obj.toString();
}
/* package */String getOriginalFilterString() {
return originalLDAP;
}
/**
* An or-type match checker
* @param properties
* @return
*/
public boolean matches(MultiMap properties) {
if (properties == null) {
throw new IllegalArgumentException();
}
Map> matchingMap = getMatchingMap(properties);
return matches(matchingMap);
}
public boolean matches(Map> toMatch) {
return topNode.doesMatch(toMatch);
}
public Set getTheAndSetFor(String propName, boolean removeIt) {
Set andSet = new HashSet();
getTheAndSetFor(andSet, propName.toLowerCase(), removeIt, topNode);
return andSet;
}
protected boolean getTheAndSetFor(Set result, String propName, boolean removeIt, Node node) {
boolean hadMatch = false;
if (node.type == BASE_TYPE) {
if (node.leftHandSide.equals(propName)) {
result.add(node.rightHandSide);
hadMatch = true;
if (removeIt) {
node.leftHandSide="";
}
}
} else if (node.type == AND_TYPE) {
Iterator iter = node.children.iterator();
while (iter.hasNext()) {
Node andNode = iter.next();
boolean matched = getTheAndSetFor(result, propName, removeIt, andNode);
hadMatch |= matched;
if (matched && removeIt) {
iter.remove();
}
}
}
return hadMatch;
}
private Map> getMatchingMap(MultiMap props) {
Map> result = new HashMap>();
for (Entry> entry : props.entrySet()) {
String key = entry.getKey().toLowerCase();
Set set = result.get(key);
if (null == set) {
set = new HashSet();
result.put(entry.getKey().toLowerCase(), set);
}
set.addAll(entry.getValue());
}
return result;
}
/**
* Static method that helps find a match
*
* @param filter
* The filter to match
* @param properties
* The properties to match them against
* @return true if there is a match, false otherwise
*/
/* package */static boolean filterMatch(String filter,
Map properties) {
if (filter == null || properties == null) {
throw new IllegalArgumentException();
}
ActiveString workString = new ActiveString(filter);
Node topNode = parse(workString);
Map> matchingMap = getMatchingMap(properties);
return topNode.doesMatch(matchingMap);
}
/* package */static Map> getMatchingMap(
Map paramProperties) {
HashMap> retVal = new HashMap>();
// Get the "fixed" map AFTER adding the system generated properties
for (Map.Entry entry : paramProperties.entrySet()) {
String key = entry.getKey();
if (key == null) {
throw new RuntimeException("Null key in property map");
}
Object value = entry.getValue();
if (value == null) {
throw new RuntimeException("Null value in property map for " + key);
}
String toLowerKey = key.toLowerCase();
Set valueSet = new HashSet();
Class valueClass = value.getClass();
if (valueClass.isArray()) {
int valueLength = Array.getLength(value);
for (int lcv = 0; lcv < valueLength; lcv++) {
Object arrayValue = Array.get(value, lcv);
if (arrayValue == null) {
throw new RuntimeException("Null value in array for " + key
+ " at index " + lcv);
}
String arrayValueString = arrayValue.toString();
valueSet.add(arrayValueString);
}
} else {
String valueString = value.toString();
valueSet.add(valueString);
}
retVal.put(toLowerKey, valueSet);
}
return retVal;
}
private static Node parse(ActiveString workString) {
Node retVal = new Node();
// I am looking for the start of an expression
workString.toStatementStart();
int type = workString.getStatementType();
switch (type) {
case BASE_TYPE:
retVal.setType(BASE_TYPE);
String lhs = workString.getLeftHandSide();
boolean isEquals = workString.getEqualsOrNotEquals();
String rhs = workString.getRightHandSide();
retVal.setLeftHandSide(lhs);
retVal.setIsEquals(isEquals);
retVal.setRightHandSide(rhs);
break;
case AND_TYPE:
case OR_TYPE:
retVal.setType(type);
while (workString.finishedOrNewStatement()) {
Node child = parse(workString);
retVal.addChild(child);
}
if (retVal.getNumChildren() <= 1) {
throw new RuntimeException(
"There was zero or one children of an AND or OR construct");
}
break;
case NEST_TYPE:
// This type was NOT incremented past the '('
Node lastNode = parse(workString);
retVal.copyNode(lastNode);
break;
case FALSE_TYPE: // getStatementType cannot return FALSE_TYPE
default:
throw new AssertionError("Unknown node type " + type);
}
return retVal;
}
private static class Node {
private int type = UNKNOWN_TYPE;
// For base type
private String leftHandSide;
private boolean equals;
private String rightHandSide;
// For and and or types
private final List children = new LinkedList();
private Node() {
this.type = AND_TYPE;
}
private Node(String lhs, boolean equals, String rhs) {
this.type = BASE_TYPE;
this.leftHandSide = lhs;
this.equals = equals;
this.rightHandSide = rhs;
}
private void setType(int paramType) {
type = paramType;
}
private void setLeftHandSide(String lhs) {
leftHandSide = lhs.toLowerCase();
}
private void setRightHandSide(String rhs) {
rightHandSide = rhs;
}
private void setIsEquals(boolean isEquals) {
equals = isEquals;
}
private void addChild(Node child) {
children.add(child);
}
private int getNumChildren() {
return children.size();
}
private void copyNode(Node copyNode) {
type = copyNode.type;
leftHandSide = copyNode.leftHandSide;
equals = copyNode.equals;
rightHandSide = copyNode.rightHandSide;
children.clear();
children.addAll(copyNode.children);
}
private boolean doesMatch(Map> toMatch) {
if (type == BASE_TYPE) {
Set valueSet = toMatch.get(leftHandSide);
if (valueSet == null) {
if (equals) {
return (null == leftHandSide || leftHandSide.length() == 0);
}
return true;
}
WildcardMatcher matcher = new WildcardMatcher(rightHandSide);
for (String val : valueSet) {
if (matcher.matches(val)) {
return equals;
}
}
// valueSet does *not* contain the value
if (equals) {
return false;
}
return true;
}
if (type == AND_TYPE) {
for (Node andNode : children) {
if (!andNode.doesMatch(toMatch)) {
return false;
}
}
return true;
}
if (type == OR_TYPE) {
for (Node orNode : children) {
if (orNode.doesMatch(toMatch)) {
return true;
}
}
return false;
}
if (type == FALSE_TYPE) {
return false;
}
throw new AssertionError("Unknown node type " + type);
}
@Override
public String toString() {
String typeString;
switch (type) {
case BASE_TYPE:
typeString = "BASE_TYPE";
break;
case AND_TYPE:
typeString = "AND_TYPE";
break;
case OR_TYPE:
typeString = "OR_TYPE";
break;
case FALSE_TYPE:
typeString = "FALSE_TYPE";
break;
default:
typeString = "Unknown_TYPE(" + type + ")";
}
return "Node(" + typeString + "," + "lhs=" + leftHandSide + ","
+ "equals=" + equals + "," + "rhs=" + rightHandSide + ","
+ System.identityHashCode(this) + ")";
}
}
private static class ActiveString {
final String original;
int dot = 0;
char data[];
private ActiveString(String fullString) {
original = fullString;
data = fullString.toCharArray();
}
/**
* Increments dot safely
*
* @param doThrow
* Tells this method to throw if it reaches the end of the string,
* the state machine knows that this should not reach the end
* @return true if there are more characters, false if this is the end
*/
private boolean incrementDot(boolean doThrow) {
if (dot + 1 >= data.length) {
// finished
if (doThrow) {
throw new RuntimeException("Invalid end of string reached in "
+ original + " at character " + dot);
}
return false;
}
dot++;
return true;
}
/**
* Skips white space
*
* @param doThrow
* if true throw an exception if the end is reached
* @return true if there are more characters, false if this is the end
*/
private boolean skipWhiteSpace(boolean doThrow) {
boolean retVal = false;
while (Character.isWhitespace(data[dot])) {
retVal = incrementDot(doThrow);
}
return retVal;
}
private void toStatementStart() {
skipWhiteSpace(true);
if (!(data[dot] == LEFT)) {
throw new RuntimeException("Statement did not start with '(', found "
+ data[dot] + " at character " + dot);
}
// Get past the left parenthesis
incrementDot(true);
}
private int getStatementType() {
skipWhiteSpace(true);
if (data[dot] == AND) {
incrementDot(true);
return AND_TYPE;
}
if (data[dot] == OR) {
incrementDot(true);
return OR_TYPE;
}
if (data[dot] == LEFT) {
// Do not increment dot
return NEST_TYPE;
}
// Do not increment dot
return BASE_TYPE;
}
/**
*
* @return false if this is finished (increments past the final ')' and true
* if there is another statement (does NOT increment past the '(')
*/
private boolean finishedOrNewStatement() {
skipWhiteSpace(true);
if (data[dot] == RIGHT) {
incrementDot(false);
return false;
}
// Do not increment past the dot
return true;
}
private String getLeftHandSide() {
int startIndex = dot;
int count = 0;
while (data[dot] != EQ) {
if ((data[dot] == NOT) && ((dot + 1) < data.length)
&& (data[dot + 1] == EQ)) {
// Found a not equals
return new String(data, startIndex, count);
}
count++;
incrementDot(true);
}
return new String(data, startIndex, count);
}
private boolean getEqualsOrNotEquals() {
if (data[dot] == EQ) {
incrementDot(true);
return true;
}
if (data[dot] == NOT) {
incrementDot(true);
if (!(data[dot] == EQ)) {
throw new AssertionError("Invalid not equals at character " + dot);
}
incrementDot(true);
return false;
}
throw new AssertionError(
"Was looking for equals or not equals but found " + data[dot]
+ " at character " + dot);
}
private String getRightHandSide() {
int startIndex = dot;
int count = 0;
while (data[dot] != RIGHT) {
count++;
incrementDot(true);
}
// This might be the end, but need to get past the )
incrementDot(false);
return new String(data, startIndex, count);
}
private void finish() {
if (skipWhiteSpace(false) == true) {
throw new RuntimeException(
"Found extra characters at end of LDAP string " + original
+ " at character " + dot);
}
}
public String toString() {
char dataDot = (dot < data.length) ? data[dot] : ' ';
return "ActiveString(" + original + "," + dot + "," + dataDot + ")";
}
}
public String toString() {
return "Filter(" + originalLDAP + "," + System.identityHashCode(this) + ")";
}
public String getLdapExpression() {
return originalLDAP;
}
}
