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Utilities for use in developing GWT applications.

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//
// $Id$
//
// OOO GWT Utils - utilities for creating GWT applications
// Copyright (C) 2009-2010 Three Rings Design, Inc., All Rights Reserved
// http://code.google.com/p/ooo-gwt-utils/
//
// 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 2.1 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 library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

package com.threerings.gwt.util;

import com.google.gwt.user.client.rpc.AsyncCallback;

/**
 * Chains failure through to another callback and allows the chainer to handle success (possibly by
 * transforming the result and passing it through to the caller).
 */
public abstract class ChainedCallback implements AsyncCallback
{
    /**
     * Creates a chained callback with the supplied target.
     */
    public ChainedCallback (AsyncCallback target)
    {
        _target = target;
    }

    // from interface AsyncCallback
    public abstract void onSuccess (T result);

    // from interface AsyncCallback
    public void onFailure (Throwable cause)
    {
        _target.onFailure(cause);
    }

    protected void forwardSuccess (P result)
    {
        _target.onSuccess(result);
    }

    protected AsyncCallback _target;
}