/*
* 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 java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.jcr.RepositoryException;
import javax.jcr.Value;
import javax.jcr.query.Row;
import javax.jcr.query.qom.Constraint;
import javax.jcr.query.qom.EquiJoinCondition;
import javax.jcr.query.qom.Join;
import javax.jcr.query.qom.Literal;
import javax.jcr.query.qom.PropertyValue;
import javax.jcr.query.qom.QueryObjectModelFactory;
class EquiJoinMerger extends JoinMerger {
private final PropertyValue leftProperty;
private final PropertyValue rightProperty;
public EquiJoinMerger(
Join join, Map<String, PropertyValue> columns,
OperandEvaluator evaluator, QueryObjectModelFactory factory,
EquiJoinCondition condition) throws RepositoryException {
super(join, columns, evaluator, factory);
PropertyValue property1 = factory.propertyValue(
condition.getSelector1Name(), condition.getProperty1Name());
PropertyValue property2 = factory.propertyValue(
condition.getSelector2Name(), condition.getProperty2Name());
if (leftSelectors.contains(property1.getSelectorName())
&& rightSelectors.contains(property2.getSelectorName())) {
leftProperty = property1;
rightProperty = property2;
} else if (leftSelectors.contains(property2.getSelectorName())
&& rightSelectors.contains(property1.getSelectorName())) {
leftProperty = property2;
rightProperty = property1;
} else {
throw new RepositoryException("Invalid equi-join");
}
}
@Override
public Set<String> getLeftValues(Row row) throws RepositoryException {
return getValues(leftProperty, row);
}
@Override
public Set<String> getRightValues(Row row) throws RepositoryException {
return getValues(rightProperty, row);
}
@Override
public List<Constraint> getRightJoinConstraints(List<Row> leftRows)
throws RepositoryException {
Map<String, Literal> literals = new HashMap<String, Literal>();
for (Row leftRow : leftRows) {
for (Value value : evaluator.getValues(leftProperty, leftRow)) {
literals.put(value.getString(), factory.literal(value));
}
}
List<Constraint> constraints =
new ArrayList<Constraint>(literals.size());
for (Literal literal : literals.values()) {
constraints.add(factory.comparison(
rightProperty, JCR_OPERATOR_EQUAL_TO, literal));
}
return constraints;
}
private Set<String> getValues(PropertyValue property, Row row)
throws RepositoryException {
Set<String> strings = new HashSet<String>();
for (Value value : evaluator.getValues(property, row)) {
strings.add(value.getString());
}
return strings;
}
}