/**
* Copyright (c) 2002-2010 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.helpers;
/**
* Utility to handle pairs of objects.
*/
public final class Pair<T1, T2>
{
private final T1 first;
private final T2 other;
/**
* Create a new pair of objects.
*
* @param first the first object in the pair.
* @param other the other object in the pair.
*/
public Pair( T1 first, T2 other )
{
this.first = first;
this.other = other;
}
/**
* @return the first object in the pair.
*/
public T1 first()
{
return first;
}
/**
* @return the other object in the pair.
*/
public T2 other()
{
return other;
}
@Override
public String toString()
{
return "(" + first + ", " + other + ")";
}
@Override
public int hashCode()
{
return ( 31 * hashCode( first ) ) | hashCode( other );
}
@SuppressWarnings( "unchecked" )
@Override
public boolean equals( Object obj )
{
if ( this == obj ) return true;
if ( obj instanceof Pair )
{
Pair that = (Pair) obj;
return equals( this.first, that.first ) && equals( this.other, that.other );
}
return false;
}
private static int hashCode( Object obj )
{
return obj == null ? 0 : obj.hashCode();
}
private static boolean equals( Object obj1, Object obj2 )
{
return ( obj1 == obj2 ) || ( obj1 != null && obj1.equals( obj2 ) );
}
}