org.modeshape.jcr.query.model.DescendantNodeJoinCondition Maven / Gradle / Ivy
/*
* ModeShape (http://www.modeshape.org)
*
* Licensed 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.modeshape.jcr.query.model;
import org.modeshape.common.annotation.Immutable;
import org.modeshape.common.util.CheckArg;
import org.modeshape.common.util.HashCode;
/**
* A join condition that evaluates to true only when the named node is a descendant of another named node.
*/
@Immutable
public class DescendantNodeJoinCondition implements JoinCondition, javax.jcr.query.qom.DescendantNodeJoinCondition {
private static final long serialVersionUID = 1L;
private final SelectorName descendantSelectorName;
private final SelectorName ancestorSelectorName;
private final int hc;
/**
* Create a join condition that determines whether the node identified by the descendant selector is indeed a descendant of
* the node identified by the ancestor selector.
*
* @param ancestorSelectorName the name of the ancestor selector
* @param descendantSelectorName the name of the descendant selector
*/
public DescendantNodeJoinCondition( SelectorName ancestorSelectorName,
SelectorName descendantSelectorName ) {
CheckArg.isNotNull(descendantSelectorName, "descendantSelectorName");
CheckArg.isNotNull(ancestorSelectorName, "ancestorSelectorName");
this.descendantSelectorName = descendantSelectorName;
this.ancestorSelectorName = ancestorSelectorName;
this.hc = HashCode.compute(this.descendantSelectorName, this.ancestorSelectorName);
}
/**
* Get the name of the selector for the descedant node.
*
* @return the selector name of the descendant node; never null
*/
public final SelectorName descendantSelectorName() {
return descendantSelectorName;
}
/**
* Get the name of the selector for the ancestor node.
*
* @return the selector name of the ancestor node; never null
*/
public final SelectorName ancestorSelectorName() {
return ancestorSelectorName;
}
@Override
public String getAncestorSelectorName() {
return ancestorSelectorName.getString();
}
@Override
public String getDescendantSelectorName() {
return descendantSelectorName.getString();
}
@Override
public String toString() {
return Visitors.readable(this);
}
@Override
public int hashCode() {
return hc;
}
@Override
public boolean equals( Object obj ) {
if (obj == this) return true;
if (obj instanceof DescendantNodeJoinCondition) {
DescendantNodeJoinCondition that = (DescendantNodeJoinCondition)obj;
if (this.hc != that.hc) return false;
if (!this.descendantSelectorName.equals(that.descendantSelectorName)) return false;
if (!this.ancestorSelectorName.equals(that.ancestorSelectorName)) return false;
return true;
}
return false;
}
@Override
public void accept( Visitor visitor ) {
visitor.visit(this);
}
}
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