/*
 * (c) Copyright 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See end of file]
 */

package migrate.lib.tuple;

import org.openjena.atlas.lib.Lib;

public class Tuple2<T> extends ZTuple<T>
{
    final T item1 ;
    final T item2 ;

    protected Tuple2(T item1, T item2) 
    {
        this.item1 = item1 ; 
        this.item2 = item2 ; 
    }
    
    @Override
    protected final boolean equalElements(ZTuple<?> x)
    {
        Tuple2<?> x1 = (Tuple2<?>)x ;
        return Lib.equal(x1.item1, item1) && Lib.equal(x1.item2, item2); 
    }
    
    @Override
    public final T get(int idx)
    {
        switch (idx)
        {
            case 0: return item1 ;
            case 1: return item2 ;
            default: throw new TupleException("Out of bounds: "+idx) ;
        }
    }

    @Override
    public final int hashCode()
    {
        return
            Lib.hashCodeObject(item1, ZTuple.NulItemHashCode)<<1
            ^ Lib.hashCodeObject(item2, ZTuple.NulItemHashCode) ; 
    }

    @Override
    public final int size()
    {
        return 2 ;
    }

}

/*
 * (c) Copyright 2009 Hewlett-Packard Development Company, LP
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */