/**
* 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.view.generic.accessors;
/**
* An accessor that wraps an inner accessor, converting from outer to inner
* on-the-fly. This is useful in cases where a one-to-one mapping exist; for
* example, from integers to strings or filenames to files.
* @param <O> outer class (of instances returned by read and write)
* @param <I> inner class (of whatever is actually being accessed)
*/
public abstract class ConvertingAccessor<O, I> implements Accessor<O> {
private final Accessor<I> inner;
private final Class<O> outer;
/**
* Constructor.
* @param outer outwardly-visible class of returned instances
* @param inner accessor used to retrieve inner object, which is
* then converted via innerToOuter and outerToInner
*/
public ConvertingAccessor(Class<O> outer, Accessor<I> inner) {
this.inner = inner;
this.outer = outer;
}
public abstract O innerToOuter(I inner);
public abstract I outerToInner(O outer);
/**
* Writes the field.
* @param outer instance to write (after to outerToInner conversion)
*/
@Override
public void write(O outer) {
inner.write(outerToInner(outer));
}
/**
* Reads the field
*/
@Override
@SuppressWarnings("unchecked")
public O read() {
return innerToOuter(inner.read());
}
@Override
public String toString() {
return "ConvFD [" + inner.toString() + "=>" + outer.getSimpleName();
}
@Override
public int hashCode() {
int hash = 7;
hash = 71 * hash + (this.inner != null ? this.inner.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
@SuppressWarnings("unchecked")
final ConvertingAccessor<O, I> other = (ConvertingAccessor<O, I>) obj;
return this.inner == other.inner
|| (this.inner != null && this.inner.equals(other.inner));
}
@Override
public Object getSource() {
return inner.getSource();
}
}