org.modeshape.jcr.query.model.EquiJoinCondition 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 tests whether a property on a node is equal to a property on another node. A node-tuple satisfies the
* constraint only if:
*
* - the {@code selector1Name} node has a property named {@code property1Name}, and
* - the {@code selector2Name} node has a property named {@code property2Name}, and
* - the value of property {@code property1Name} is equal to the value of property {@code property2Name}
*
*/
@Immutable
public class EquiJoinCondition implements JoinCondition, javax.jcr.query.qom.EquiJoinCondition {
private static final long serialVersionUID = 1L;
private final SelectorName selector1Name;
private final String property1Name;
private final SelectorName selector2Name;
private final String property2Name;
private final int hc;
/**
* Create an equi-join condition, given the names of the selector and property for the left- and right-hand-side of the join.
*
* @param selector1Name the selector name appearing on the left-side of the join; never null
* @param property1Name the property name for the left-side of the join; never null
* @param selector2Name the selector name appearing on the right-side of the join; never null
* @param property2Name the property name for the right-side of the join; never null
*/
public EquiJoinCondition( SelectorName selector1Name,
String property1Name,
SelectorName selector2Name,
String property2Name ) {
CheckArg.isNotNull(selector1Name, "selector1Name");
CheckArg.isNotNull(property1Name, "property1Name");
CheckArg.isNotNull(selector2Name, "selector2Name");
CheckArg.isNotNull(property2Name, "property2Name");
this.selector1Name = selector1Name;
this.property1Name = property1Name;
this.selector2Name = selector2Name;
this.property2Name = property2Name;
this.hc = HashCode.compute(this.selector1Name, this.property1Name, this.selector2Name, this.property2Name);
}
/**
* Create an equi-join condition, given the columns.
*
* @param column1 the column for the left-side of the join; never null
* @param column2 the column for the right-side of the join; never null
*/
public EquiJoinCondition( Column column1,
Column column2 ) {
this(column1.selectorName(), column1.getPropertyName(), column2.selectorName(), column2.getPropertyName());
}
/**
* Get the name of the selector that appears on the left-side of the join.
*
* @return the selector name appearing on the left-side of the join; never null
*/
public final SelectorName selector1Name() {
return selector1Name;
}
/**
* Get the name of the selector that appears on the right-side of the join.
*
* @return the selector name appearing on the right-side of the join; never null
*/
public final SelectorName selector2Name() {
return selector2Name;
}
@Override
public String getSelector1Name() {
return selector1Name.getString();
}
@Override
public String getSelector2Name() {
return selector2Name.getString();
}
@Override
public final String getProperty1Name() {
return property1Name;
}
@Override
public final String getProperty2Name() {
return property2Name;
}
@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 EquiJoinCondition) {
EquiJoinCondition that = (EquiJoinCondition)obj;
if (this.hc != that.hc) return false;
if (!this.selector1Name.equals(that.selector1Name)) return false;
if (!this.selector2Name.equals(that.selector2Name)) return false;
if (!this.property1Name.equals(that.property1Name)) return false;
if (!this.property2Name.equals(that.property2Name)) return false;
return true;
}
return false;
}
@Override
public void accept( Visitor visitor ) {
visitor.visit(this);
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy