org.badiff.io.GraphContext Maven / Gradle / Ivy

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/**
 * badiff - byte array diff - fast pure-java byte-level diffing
 * 
 * Copyright (c) 2013, Robin Kirkman All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 * 
 * 1) Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer.
 * 2) Redistributions in binary form must reproduce the above copyright notice, 
 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution.
 * 3) Neither the name of the badiff nor the names of its contributors may be 
 *    used to endorse or promote products derived from this software without 
 *    specific prior written permission.
 *    
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.badiff.io;

import java.util.HashMap;
import java.util.Map;

public class GraphContext extends HashMap {
	private static final long serialVersionUID = 0;
	
	private Map context;
	
	public GraphContext(Map context) {
		this.context = context;
	}
	
	@Override
	public boolean containsKey(Object key) {
		return super.containsKey(key) || context.containsKey(key);
	}
	
	@Override
	public Object get(Object key) {
		return super.containsKey(key) ? super.get(key) : context.get(key);
	}
}