org.glassfish.pfl.basic.contain.ObjectSet Maven / Gradle / Ivy
/*
* Copyright (c) 2008, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/*
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*/
package org.glassfish.pfl.basic.contain;
import java.util.IdentityHashMap;
import java.util.Iterator;
/**
*
* @author ken
*/
public class ObjectSet {
private IdentityHashMap map = new IdentityHashMap();
private static Object VALUE = new Object() ;
public boolean contains( Object obj ) {
return map.get( obj ) == VALUE ;
}
public void add( Object obj ) {
map.put( obj, VALUE ) ;
}
public void remove( Object obj ) {
map.remove( obj ) ;
}
public Iterator iterator() {
return map.keySet().iterator() ;
}
}