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/*
 * Copyright 2011 ArcBees Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.gwtplatform.dispatch.rpc.shared;

/**
 * Provides support for simple update response which contain both the old value and new value.
 *
 * @param  The value type.
 */
public abstract class AbstractUpdateResult implements Result {
    private static final long serialVersionUID = 1L;

    private T newValue;

    private T oldValue;

    public AbstractUpdateResult(T oldValue, T newValue) {
        this.oldValue = oldValue;
        this.newValue = newValue;
    }

    /**
     * For serialization support only. Subclasses should provide an package-local (aka default) empty constructor.
     */
    protected AbstractUpdateResult() {
    }

    /**
     * The new/current value.
     *
     * @return The new value.
     */
    public T getNew() {
        return newValue;
    }

    /**
     * The previous value.
     *
     * @return The old value.
     */
    public T getOld() {
        return oldValue;
    }
}