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/*******************************************************************************
* Copyright (c) 2007, 2008 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.utility.internal.model.value;
import org.eclipse.jpt.utility.model.Model;
import org.eclipse.jpt.utility.model.event.StateChangeEvent;
import org.eclipse.jpt.utility.model.listener.StateChangeListener;
import org.eclipse.jpt.utility.model.value.WritablePropertyValueModel;
/**
* Extend ValueAspectAdapter to listen to the
* "state" of the value in the wrapped value model.
*/
public class ValueStateAdapter<T extends Model>
extends ValueAspectAdapter<T>
{
/** Listener that listens to value. */
protected final StateChangeListener valueStateListener;
// ********** constructors **********
/**
* Construct an adapter for the value state.
*/
public ValueStateAdapter(WritablePropertyValueModel<T> valueHolder) {
super(valueHolder);
this.valueStateListener = this.buildValueStateListener();
}
// ********** initialization **********
protected StateChangeListener buildValueStateListener() {
return new StateChangeListener() {
public void stateChanged(StateChangeEvent event) {
ValueStateAdapter.this.valueAspectChanged();
}
@Override
public String toString() {
return "value state listener";
}
};
}
// ********** behavior **********
@Override
protected void engageValue_() {
this.value.addStateChangeListener(this.valueStateListener);
}
@Override
protected void disengageValue_() {
this.value.removeStateChangeListener(this.valueStateListener);
}
}
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