com.adobe.internal.util.WeakHashSet Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of aem-sdk-api Show documentation

The Adobe Experience Manager SDK

There is a newer version: 2024.11.18751.20241128T090041Z-241100

/*
 *
 *	File: WeakHashSet.java
 *
 *
 *	ADOBE CONFIDENTIAL
 *	___________________
 *
 *	Copyright 2005 Adobe Systems Incorporated
 *	All Rights Reserved.
 *
 *	NOTICE: All information contained herein is, and remains the property of
 *	Adobe Systems Incorporated and its suppliers, if any. The intellectual
 *	and technical concepts contained herein are proprietary to Adobe Systems
 *	Incorporated and its suppliers and may be covered by U.S. and Foreign
 *	Patents, patents in process, and are protected by trade secret or
 *	copyright law. Dissemination of this information or reproduction of this
 *	material is strictly forbidden unless prior written permission is obtained
 *	from Adobe Systems Incorporated.
 *
 */
package com.adobe.internal.util;

import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
import java.util.WeakHashMap;

/**
 * The WeakHashSet is an implementation of the Set
 * interface that uses a WeakHashMap.
 * 
 */
public class WeakHashSet extends AbstractSet implements Set
{
    private transient WeakHashMap map;
    
    private static final Object dummy = new Object();
    
    /**
     * 
     */
    public WeakHashSet()
    {
        this.map = new WeakHashMap();
    }

    public WeakHashSet(Collection c)
    {
        this.map = new WeakHashMap(Math.max((int) (c.size() / 0.75f) + 1, 16));
        addAll(c);
    }
    
    public WeakHashSet(int initialCapacity, float loadFactor)
    {
        this.map = new WeakHashMap(initialCapacity, loadFactor);
    }
    
    public WeakHashSet(int initialCapacity)
    {
        this.map = new WeakHashMap(initialCapacity);
    }
    
    /* (non-Javadoc)
     * @see java.util.AbstractCollection#iterator()
     */
    public Iterator iterator()
    {
        return this.map.keySet().iterator();
    }

    /* (non-Javadoc)
     * @see java.util.AbstractCollection#size()
     */
    public int size()
    {
        return this.map.size();
    }

    public boolean isEmpty()
    {
        return map.isEmpty();
    }
    
    public boolean contains(Object obj)
    {
        return map.containsKey(obj);
    }
    
    /* (non-Javadoc)
     * @see java.util.AbstractCollection#add(java.lang.Object)
     */
    public boolean add(Object obj)
    {
        return this.map.put(obj, dummy) == null;
    }

    public boolean remove(Object obj)
    {
        return this.map.remove(obj) == dummy;
    }
    
    public void clear()
    {
        this.map.clear();
    }
}