/*
 * JBox2D - A Java Port of Erin Catto's Box2D
 * 
 * JBox2D homepage: http://jbox2d.sourceforge.net/ 
 * Box2D homepage: http://www.box2d.org
 * 
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * 
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 * 
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */

package org.jbox2d.collision;

//Updated to rev 56->136 of b2PairManager.h

public abstract class PairCallback {
    // This should return the new pair user data. It is okay if the
    // user data is null.
    public abstract Object pairAdded(Object proxyUserData1,
            Object proxyUserData2);

    // This should free the pair's user data. In extreme circumstances, it is
    // possible
    // this will be called with null pairUserData because the pair never
    // existed.
    public abstract void pairRemoved(Object proxyUserData1,
            Object proxyUserData2, Object pairUserData);
}