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/*******************************************************************************
* Copyright (c) 2008 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.utility.internal;
/**
* Implement some of the methods in 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.key() == null ?
other.key() == null : this.key().equals(other.key()))
&& (this.value() == null ?
other.value() == null : this.value().equals(other.value()));
}
@Override
public synchronized int hashCode() {
return (this.key() == null ? 0 : this.key().hashCode())
^ (this.value() == null ? 0 : this.value().hashCode());
}
@Override
public synchronized String toString() {
return this.key() + " => " + this.value();
}
}
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