/*****************************************************************************
* 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.views.properties.modelelement;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.core.databinding.observable.IObservable;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.papyrus.infra.tools.databinding.AggregatedObservable;
import org.eclipse.papyrus.infra.tools.databinding.MultipleObservableValue;
import org.eclipse.papyrus.infra.widgets.providers.EmptyContentProvider;
import org.eclipse.papyrus.infra.widgets.providers.IStaticContentProvider;
/**
* A ModelElement to handle MultiSelection property views.
* It is composed of standard ModelElement. The result of method
* calls are an aggregation of the results of the same method calls
* on each sub-element, when this makes sense (i.e. for booleans)
* When an aggregation is not possible, the result of the same method
* call on the first element is returned (e.g. for Content and Label providers)
*
* @author Camille Letavernier
*/
public class CompositeModelElement extends AbstractModelElement {
@Override
public IObservable doGetObservable(String propertyPath) {
AggregatedObservable observableComposite = null;
for(ModelElement element : elements) {
IObservable observable = element.getObservable(propertyPath);
//Otherwise, we use a standard AggregatedComposite
if(observableComposite == null) {
if(observable instanceof AggregatedObservable) {
observableComposite = (AggregatedObservable)observable;
} else {
if(observable instanceof IObservableValue) {
observableComposite = new MultipleObservableValue().aggregate(observable);
if(observableComposite == null) {
return null;
}
} else {
return null; //The support for CompositeObservableList is too complicated.
//There are too many non-trivial choices (Union or Intersection display,
//unadapted behavior of MultipleValueEditors, ...)
//observableComposite = new MultipleObservableList();
}
}
} else {
if((observableComposite = observableComposite.aggregate(observable)) == null) {
return null;
}
}
}
return observableComposite;
}
/**
* Adds a sub-model element to this CompositeModelElement
*
* @param element
* The sub-model element to be added
*/
public void addModelElement(ModelElement element) {
elements.add(element);
}
@Override
public IStaticContentProvider getContentProvider(String propertyPath) {
if(elements.isEmpty()) {
return EmptyContentProvider.instance;
}
return elements.get(0).getContentProvider(propertyPath);
}
@Override
public ILabelProvider getLabelProvider(String propertyPath) {
if(elements.isEmpty()) {
return null;
}
return elements.get(0).getLabelProvider(propertyPath);
}
@Override
public boolean isOrdered(String propertyPath) {
if(elements.isEmpty()) {
return false;
}
for(ModelElement element : elements) {
if(element.isOrdered(propertyPath)) {
return true;
}
}
return false;
}
@Override
public boolean isUnique(String propertyPath) {
if(elements.isEmpty()) {
return false;
}
for(ModelElement element : elements) {
if(!element.isUnique(propertyPath)) {
return false;
}
}
return true;
}
@Override
public boolean isMandatory(String propertyPath) {
if(elements.isEmpty()) {
return false;
}
for(ModelElement element : elements) {
if(!element.isMandatory(propertyPath)) {
return false;
}
}
return true;
}
@Override
public boolean isEditable(String propertyPath) {
if(elements.isEmpty()) {
return false;
}
for(ModelElement element : elements) {
if(!element.isEditable(propertyPath)) {
return false;
}
}
return true;
}
private List<ModelElement> elements = new LinkedList<ModelElement>();
@Override
public boolean forceRefresh(String propertyPath) {
if(elements.isEmpty()) {
return false;
}
for(ModelElement element : elements) {
if(element.forceRefresh(propertyPath)) {
return true;
}
}
return false;
}
@Override
public Object getDefaultValue(String propertyPath) {
if(elements.isEmpty()) {
return null;
}
return elements.get(0).getDefaultValue(propertyPath);
}
public List<ModelElement> getSubElements() {
return elements;
}
}