ValueObject.java

/*   Copyright 2012 Tim Garrett, Mothsoft LLC
 *
 *  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.mothsoft.alexis.web;

/**
 * Lightweight holder suitable for providing an injectable state holder of a
 * different scope than the object using it
 * 
 * @author tgarrett
 * 
 * @param <T>
 */
public class ValueObject<T> {

    private T initialValue;
    private T value;

    public ValueObject() {
    }

    public T getValue() {
        return this.value;
    }

    public void setValue(T value) {
        if (this.initialValue == null) {
            this.initialValue = value;
        }

        this.value = value;
    }

    public void reset() {
        this.value = this.initialValue;
    }

}