Triple.java

// Copyright (c) 2011, David J. Pearce (djp@ecs.vuw.ac.nz)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//    * Redistributions of source code must retain the above copyright
//      notice, this list of conditions and the following disclaimer.
//    * 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.
//    * Neither the name of the <organization> 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 DAVID J. PEARCE 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
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package jasm.util;


/**
 * This class represents a triple of items
 * 
 * @author David J. Pearce
 *
 * @param <FIRST> Type of first item
 * @param <SECOND> Type of second item
 * @param <THIRD> Type of second item
 */
public class Triple<FIRST,SECOND,THIRD> extends Pair<FIRST,SECOND> {	
	public THIRD third;
			
	public Triple(FIRST f, SECOND s, THIRD t) {
		super(f,s);
		third=t;
	}		
	
	public THIRD third() { return third; }
	
	public int hashCode() {		
		int phc = super.hashCode();
		int thc = third == null ? 0 : third.hashCode();
		return phc ^ thc; 
	}
	
	public boolean equals(Object o) {
		if(o instanceof Triple) {
			@SuppressWarnings("unchecked")
			Triple<FIRST,SECOND,THIRD> p = (Triple<FIRST,SECOND,THIRD>) o;
			boolean r=false;
			if(first() != null) { r = first().equals(p.first()); }
			else { r = p.first() == first(); }
			if(second() != null) { r &= second().equals(p.second()); }
			else { r &= p.second() == second(); }
			if(third != null) { r &= third.equals(p.third()); }
			else { r &= p.third() == third; }		
			return r;				
		}
		return false;
	}
	
	public String toString() {
		String f = first() == null ? "null" : first().toString();
		String s = second() == null ? "null" : second().toString();
		String t = third == null ? "null" : third.toString();
		return "(" + f + "," + s + "," + t + ")";
	}
}