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The DSI utilities are a mish mash of classes accumulated during the last ten years in projects developed at the DSI (Dipartimento di Scienze dell'Informazione, i.e., Information Sciences Department), now DI (Dipartimento di Informatica, i.e., Informatics Department), of the Universita` degli Studi di Milano.

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package it.unimi.dsi.lang;

/*		 
 * DSI utilities
 *
 * Copyright (C) 2010-2016 Sebastiano Vigna 
 *
 *  This library is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU Lesser General Public License as published by the Free
 *  Software Foundation; either version 3 of the License, or (at your option)
 *  any later version.
 *
 *  This library is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, see .
 * 
 */

public class TwoStrings {
	private final String a;
	private final String b;
	private final Object context;
	public void test() {}
	
	public TwoStrings( String a, String b ) {
		this( null, a, b );
	}

	public TwoStrings( String... a ) {
		this( null, a );
	}
	
	public static TwoStrings getInstance( String a ) {
		return new TwoStrings( a, a );
	}
	
	public static TwoStrings getInstance( String... a ) {
		return getInstance( Integer.toString( a.length ) );
	}
	
	public TwoStrings( Object context, String a, String b ) {
		this.a = a;
		this.b = b;
		this.context = context;
	}

	public TwoStrings( Object context, String... a ) {
		this.a = a[ 0 ];
		this.b = Integer.toString( a.length );
		this.context = context;
	}
	
	public static TwoStrings getInstance( Object context, String a ) {
		return new TwoStrings( context, a, a );
	}
	
	public static TwoStrings getInstance( Object context, String... a ) {
		return getInstance( context, Integer.toString( a.length ) );
	}
	
	@Override
	public boolean equals( Object obj ) {
		if ( this == obj ) return true;
		if ( obj == null ) return false;
		if ( getClass() != obj.getClass() ) return false;
		final TwoStrings other = (TwoStrings)obj;
		if ( a == null ) {
			if ( other.a != null ) return false;
		}
		else if ( !a.equals( other.a ) ) return false;
		if ( b == null ) {
			if ( other.b != null ) return false;
		}
		else if ( !b.equals( other.b ) ) return false;
		if ( context == null ) {
			if ( other.context != null ) return false;
		}
		else if ( !context.equals( other.context ) ) return false;
		return true;
	}
	
	@Override
	public String toString() {
		return getClass().getName() + "(" + context + ", " + a + ", " + b + ")";
	}
}