org.jgrapht.util.ArrayUnenforcedSet Maven / Gradle / Ivy
/* ==========================================
* JGraphT : a free Java graph-theory library
* ==========================================
*
* Project Info: http://jgrapht.sourceforge.net/
* Project Creator: Barak Naveh (http://sourceforge.net/users/barak_naveh)
*
* (C) Copyright 2003-2008, by Barak Naveh and Contributors.
*
* This program and the accompanying materials are dual-licensed under
* either
*
* (a) the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation, or (at your option) any
* later version.
*
* or (per the licensee's choosing)
*
* (b) the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation.
*/
/* -----------------
* ArrayUnenforcedSet.java
* -----------------
* (C) Copyright 2006-2008, by John V. Sichi and Contributors.
*
* Original Author: John V. Sichi
* Contributor(s): -
*
* $Id$
*
* Changes
* -------
* 07-May-2006 : Initial version (JVS);
*/
package org.jgrapht.util;
import java.util.*;
/**
* Helper for efficiently representing small sets whose elements are known to be
* unique by construction, implying we don't need to enforce the uniqueness
* property in the data structure itself. Use with caution.
*
* Note that for equals/hashCode, the class implements the Set behavior
* (unordered), not the list behavior (ordered); the fact that it subclasses
* ArrayList should be considered an implementation detail.
*
* @author John V. Sichi
*/
public class ArrayUnenforcedSet
extends ArrayList
implements Set
{
private static final long serialVersionUID = -7413250161201811238L;
public ArrayUnenforcedSet()
{
super();
}
public ArrayUnenforcedSet(Collection c)
{
super(c);
}
public ArrayUnenforcedSet(int n)
{
super(n);
}
public boolean equals(Object o)
{
return new SetForEquality().equals(o);
}
public int hashCode()
{
return new SetForEquality().hashCode();
}
/**
* Multiple inheritance helper.
*/
private class SetForEquality
extends AbstractSet
{
public Iterator iterator()
{
return ArrayUnenforcedSet.this.iterator();
}
public int size()
{
return ArrayUnenforcedSet.this.size();
}
}
}
// End ArrayUnenforcedSet.java