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WOOL is a simple, powerful dialogue framework for creating virtual agent conversations.

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/*
 * Copyright 2019 Roessingh Research and Development.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a 
 * copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation 
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the 
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 * DEALINGS IN THE SOFTWARE.
 */

package nl.rrd.wool.utils;

public class ReferenceParameter {
	private T value = null;

	public ReferenceParameter() {
	}

	public ReferenceParameter(T value) {
		this.value = value;
	}

	public T get() {
		return value;
	}

	public void set(T value) {
		this.value = value;
	}

	@Override
	public int hashCode() {
		return value == null ? 0 : value.hashCode();
	}

	@Override
	public boolean equals(Object obj) {
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		ReferenceParameter other = (ReferenceParameter)obj;
		if ((value == null) != (other.value == null))
			return false;
		if (value != null && !value.equals(other.value))
			return false;
		return true;
	}

	@Override
	public String toString() {
		return value == null ? "null" : value.toString();
	}
}