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/*****************************************************************************
* Copyright (c) 2010 CEA LIST.
*
* 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:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.infra.tools.databinding;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.core.databinding.observable.ChangeEvent;
import org.eclipse.core.databinding.observable.IChangeListener;
import org.eclipse.core.databinding.observable.IObservable;
import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.ValueDiff;
import org.eclipse.papyrus.infra.widgets.databinding.AggregatedObservable;
/**
* MultipleObservableValue is used to map a single element
* to a collection of model elements.
*
* It is especially used when displaying a Property View for multiple elements,
* when we want to edit the same property for all of them.
*
* All sub-elements will be edited at the same time, with the same value.
*/
//TODO : Add listeners on sub-observables, and remove them on dispose
public class MultipleObservableValue extends AbstractObservableValue implements AggregatedObservable, IChangeListener {
/**
*
* Constructor.
*
* @param values
* The collection of sub-elements for this MultipleObservableValue
*
*/
public MultipleObservableValue(Collection<IObservableValue> values) {
if(values != null) {
observableValues.addAll(values);
}
}
/**
*
* Constructor.
*
*/
public MultipleObservableValue() {
}
public Object getValueType() {
if(observableValues.isEmpty()) {
return null;
}
return observableValues.get(0).getValueType();
}
/**
* If all objects have the same value, returns this value
* Otherwise, returns the defaultGetValue
* If the defaultGetValue hasn't been set, returns null
*/
@Override
protected Object doGetValue() {
if(hasDifferentValues() || observableValues.isEmpty()) {
return null;
}
return observableValues.get(0).getValue();
}
private boolean equals(Object value, Object currentValue) {
if(value == currentValue) {
return true;
}
if(value == null) {
return false;
}
return value.equals(currentValue);
}
@Override
protected void doSetValue(Object value) {
for(IObservableValue observable : observableValues) {
observable.setValue(value);
}
}
public AggregatedObservable aggregate(IObservable observable) {
if(observable instanceof IObservableValue) {
observableValues.add((IObservableValue)observable);
observable.addChangeListener(this);
return this;
}
return null;
}
/**
* @return the list of sub-observable values
*/
public List<IObservableValue> getObservableValues() {
return observableValues;
}
/**
* @return the list of observed values
*/
public List<Object> getObservedValues() {
List<Object> result = new LinkedList<Object>();
for(IObservableValue value : getObservableValues()) {
result.add(value.getValue());
}
return result;
}
@Override
public void dispose() {
super.dispose();
for(IObservableValue observable : observableValues) {
observable.removeChangeListener(this);
observable.dispose();
}
}
protected List<IObservableValue> observableValues = new LinkedList<IObservableValue>();
public boolean hasDifferentValues() {
if(observableValues.isEmpty()) {
return false;
}
Object currentValue = null;
boolean firstValue = true;
for(IObservableValue observable : observableValues) {
if(firstValue) {
firstValue = false;
currentValue = observable.getValue();
} else {
Object value = observable.getValue();
if(equals(value, currentValue)) {
continue;
}
return true;
}
}
return false;
}
public void handleChange(ChangeEvent event) {
//We're not interested in the old and new values
//We just return two different values so that a change event is fired
super.fireValueChange(new ValueDiff() {
@Override
public Object getOldValue() {
return true;
}
@Override
public Object getNewValue() {
return false;
}
});
}
}
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