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/*******************************************************************************
* Copyright (c) 2008, 2010 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal;
/**
* Implement some of the methods in {@link Association} that can
* be defined in terms of the other methods.
*/
public abstract class AbstractAssociation<K, V>
implements Association<K, V>
{
/**
* Default constructor.
*/
protected AbstractAssociation() {
super();
}
@Override
public synchronized boolean equals(Object o) {
if ( ! (o instanceof Association<?, ?>)) {
return false;
}
Association<?, ?> other = (Association<?, ?>) o;
return this.keyEquals(other) && this.valueEquals(other);
}
protected boolean keyEquals(Association<?, ?> other) {
Object key = this.getKey();
return (key == null) ?
(other.getKey() == null) :
key.equals(other.getKey());
}
protected boolean valueEquals(Association<?, ?> other) {
Object value = this.getValue();
return (value == null) ?
(other.getValue() == null) :
value.equals(other.getValue());
}
@Override
public synchronized int hashCode() {
return this.keyHashCode() ^ this.valueHashCode();
}
protected int keyHashCode() {
Object key = this.getKey();
return (key == null) ? 0 : key.hashCode();
}
protected int valueHashCode() {
Object value = this.getValue();
return (value == null) ? 0 : value.hashCode();
}
@Override
public synchronized String toString() {
return this.getKey() + " => " + this.getValue(); //$NON-NLS-1$
}
}
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