/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jackrabbit.core.query.lucene.join;
import static javax.jcr.query.qom.QueryObjectModelConstants.JCR_OPERATOR_EQUAL_TO;
import static javax.jcr.query.qom.QueryObjectModelConstants.JCR_OPERATOR_GREATER_THAN;
import static javax.jcr.query.qom.QueryObjectModelConstants.JCR_OPERATOR_GREATER_THAN_OR_EQUAL_TO;
import static javax.jcr.query.qom.QueryObjectModelConstants.JCR_OPERATOR_LESS_THAN;
import static javax.jcr.query.qom.QueryObjectModelConstants.JCR_OPERATOR_LESS_THAN_OR_EQUAL_TO;
import static javax.jcr.query.qom.QueryObjectModelConstants.JCR_OPERATOR_LIKE;
import static javax.jcr.query.qom.QueryObjectModelConstants.JCR_OPERATOR_NOT_EQUAL_TO;
import java.util.Arrays;
import java.util.Comparator;
import java.util.regex.Pattern;
import javax.jcr.RepositoryException;
import javax.jcr.Value;
import org.apache.jackrabbit.core.query.lucene.Util;
/**
* Comparator for {@link Value} instances.
*/
public class ValueComparator implements Comparator<Value> {
/**
* Compares two values.
*/
public int compare(Value a, Value b) {
try {
return Util.compare(a, b);
} catch (RepositoryException e) {
throw new RuntimeException("Unable to compare values " + a
+ " and " + b, e);
}
}
/**
* Evaluates the given QOM comparison operation with the given values.
*
* @param operator QOM comparison operator
* @param a left value
* @param b right value
* @return result of the comparison
*/
public boolean evaluate(String operator, Value a, Value b) {
if (JCR_OPERATOR_EQUAL_TO.equals(operator)) {
return compare(a, b) == 0;
} else if (JCR_OPERATOR_GREATER_THAN.equals(operator)) {
return compare(a, b) > 0;
} else if (JCR_OPERATOR_GREATER_THAN_OR_EQUAL_TO.equals(operator)) {
return compare(a, b) >= 0;
} else if (JCR_OPERATOR_LESS_THAN.equals(operator)) {
return compare(a, b) < 0;
} else if (JCR_OPERATOR_LESS_THAN_OR_EQUAL_TO.equals(operator)) {
return compare(a, b) <= 0;
} else if (JCR_OPERATOR_NOT_EQUAL_TO.equals(operator)) {
return compare(a, b) != 0;
} else if (JCR_OPERATOR_LIKE.equals(operator)) {
try {
Pattern pattern = Util.createRegexp(b.getString());
return pattern.matcher(a.getString()).matches();
} catch (RepositoryException e) {
throw new RuntimeException(
"Unable to compare values " + a + " and " + b, e);
}
} else {
throw new IllegalArgumentException(
"Unknown comparison operator: " + operator);
}
}
public int compare(Value[] a, Value[] b) {
try {
return Util.compare(a, b);
} catch (RepositoryException e) {
throw new RuntimeException("Unable to compare values "
+ Arrays.toString(a) + " and " + Arrays.toString(b), e);
}
}
/**
* Evaluates the given QOM comparison operation with the given value arrays.
*
* @param operator QOM comparison operator
* @param a left values
* @param b right values
* @return result of the comparison
*/
public boolean evaluate(String operator, Value[] a, Value[] b) {
if (JCR_OPERATOR_EQUAL_TO.equals(operator)) {
return compare(a, b) == 0;
} else if (JCR_OPERATOR_GREATER_THAN.equals(operator)) {
return compare(a, b) > 0;
} else if (JCR_OPERATOR_GREATER_THAN_OR_EQUAL_TO.equals(operator)) {
return compare(a, b) >= 0;
} else if (JCR_OPERATOR_LESS_THAN.equals(operator)) {
return compare(a, b) < 0;
} else if (JCR_OPERATOR_LESS_THAN_OR_EQUAL_TO.equals(operator)) {
return compare(a, b) <= 0;
} else if (JCR_OPERATOR_NOT_EQUAL_TO.equals(operator)) {
return compare(a, b) != 0;
}
// TODO JCR_OPERATOR_LIKE
throw new IllegalArgumentException("Unknown comparison operator: "
+ operator);
}
}