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/*******************************************************************************
* Copyright (c) 2005, 2010 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
* Brad Reynolds - bug 164653
*******************************************************************************/
package org.eclipse.papyrus.xwt.databinding;
import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.IValueChangeListener;
import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
import org.eclipse.papyrus.xwt.IMultiValueConverter;
import org.eclipse.papyrus.xwt.XWT;
/**
* @since 3.2
*
*/
public class AggregateObservableValue extends AbstractObservableValue {
private IObservableValue[] observableValues;
private boolean updating = false;
private IMultiValueConverter converter;
private Object currentValue;
private IValueChangeListener listener = new IValueChangeListener() {
public void handleValueChange(ValueChangeEvent event) {
if(!updating) {
fireValueChange(Diffs.createValueDiff(currentValue, doGetValue()));
}
}
};
/**
* @param observableValues
* @param delimiter
*/
public AggregateObservableValue(IObservableValue[] observableValues, IMultiValueConverter converter) {
super(findRealm(observableValues));
this.converter = converter;
this.observableValues = observableValues;
for(int i = 0; i < observableValues.length; i++) {
observableValues[i].addValueChangeListener(listener);
}
doGetValue();
}
private static Realm findRealm(IObservableValue[] observableValues) {
for(IObservableValue observableValue : observableValues) {
return observableValue.getRealm();
}
return XWT.getRealm();
}
public void doSetValue(Object value) {
Object oldValue = doGetValue();
try {
updating = true;
Object[] values = converter.convertBack(value);
for(int i = 0; i < observableValues.length; i++) {
if(i < values.length) {
observableValues[i].setValue(values[i]);
} else {
observableValues[i].setValue(null);
}
}
} finally {
updating = false;
}
doGetValue();
currentValue = value;
fireValueChange(Diffs.createValueDiff(oldValue, value));
}
public Object doGetValue() {
Object[] values = new Object[observableValues.length];
for(int i = 0; i < values.length; i++) {
values[i] = observableValues[i].getValue();
}
return converter.convert(values);
}
public Object getValueType() {
return String[].class;
}
public synchronized void dispose() {
for(int i = 0; i < observableValues.length; i++) {
observableValues[i].removeValueChangeListener(listener);
}
super.dispose();
}
}
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