org.modeshape.jcr.query.model.PropertyExistence 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 constraint that evaluates to true only when a named property exists on a node.
*/
@Immutable
public class PropertyExistence implements Constraint, javax.jcr.query.qom.PropertyExistence {
private static final long serialVersionUID = 1L;
private final SelectorName selectorName;
private final String propertyName;
private final int hc;
/**
* Create a constraint requiring that a property exist on a node.
*
* @param selectorName the name of the node selector
* @param propertyName the name of the property that must exist
*/
public PropertyExistence( SelectorName selectorName,
String propertyName ) {
CheckArg.isNotNull(selectorName, "selectorName");
CheckArg.isNotNull(propertyName, "propertyName");
this.selectorName = selectorName;
this.propertyName = propertyName;
this.hc = HashCode.compute(this.selectorName, this.propertyName);
}
/**
* Get the name of the selector.
*
* @return the selector name; never null
*/
public final SelectorName selectorName() {
return selectorName;
}
@Override
public String getSelectorName() {
return selectorName().getString();
}
@Override
public final String getPropertyName() {
return propertyName;
}
@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 PropertyExistence) {
PropertyExistence that = (PropertyExistence)obj;
if (this.hc != that.hc) return false;
return this.selectorName.equals(that.selectorName) && this.propertyName.equals(that.propertyName);
}
return false;
}
@Override
public void accept( Visitor visitor ) {
visitor.visit(this);
}
}
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