/**
* eAdventure (formerly <e-Adventure> and <e-Game>) is a research project of the
* <e-UCM> research group.
*
* Copyright 2005-2010 <e-UCM> research group.
*
* You can access a list of all the contributors to eAdventure at:
* http://e-adventure.e-ucm.es/contributors
*
* <e-UCM> is a research group of the Department of Software Engineering
* and Artificial Intelligence at the Complutense University of Madrid
* (School of Computer Science).
*
* C Profesor Jose Garcia Santesmases sn,
* 28040 Madrid (Madrid), Spain.
*
* For more info please visit: <http://e-adventure.e-ucm.es> or
* <http://www.e-ucm.es>
*
* ****************************************************************************
*
* This file is part of eAdventure, version 2.0
*
* eAdventure 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 3 of the License, or
* (at your option) any later version.
*
* eAdventure 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 eAdventure. If not, see <http://www.gnu.org/licenses/>.
*/
package es.eucm.ead.editor.util;
/**
* Generic pointer class.
*
* @param <T> Type of the element to point at.
*/
public class Pointer<T> {
/**
* Referenced element;
*/
public T reference;
/**
* Creates an empty {link Pointer}.
*/
public Pointer() {
this(null);
}
/**
* Creates a {link Pointer} to the specified element.
*
* @param reference Element to point at.
*/
public Pointer(T reference) {
this.reference = reference;
}
/**
* Returns the referenced element.
*
* @return the referenced element.
*/
public T getReference() {
return reference;
}
/**
* Establishs the referenced element.
*
* @param reference Element to reference.
*/
public void setReference(T reference) {
this.reference = reference;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result
+ ((reference == null) ? 0 : reference.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
@SuppressWarnings("rawtypes")
Pointer other = (Pointer) obj;
if (reference == null) {
if (other.reference != null)
return false;
} else if (!reference.equals(other.reference))
return false;
return true;
}
}