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/*****************************************************************************
* Copyright (c) 2011 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.widgets.providers;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
public class TreeToFlatContentProvider implements IStaticContentProvider {
private ITreeContentProvider contentProvider;
private StructuredViewer viewer;
public TreeToFlatContentProvider(ITreeContentProvider provider) {
if(!(provider instanceof IStaticContentProvider)) {
throw new IllegalArgumentException();
}
this.contentProvider = provider;
}
public void dispose() {
contentProvider.dispose();
}
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
if(viewer instanceof StructuredViewer) {
this.viewer = (StructuredViewer)viewer;
}
contentProvider.inputChanged(viewer, oldInput, newInput);
}
public Object[] getElements() {
return getElementsList().toArray();
}
/**
* Returns the concrete value from the given Object
* For example, if the content provider is an IAdaptableContentProvider,
* returns the adapted value.
*
* @param value
* @return
*/
protected Object getValue(Object value) {
if(contentProvider instanceof IAdaptableContentProvider) {
return ((IAdaptableContentProvider)contentProvider).getAdaptedValue(value);
} else {
return value;
}
}
protected boolean exploreBranch(Object parentElement, Object element) {
if(viewer == null) {
return true;
}
for(ViewerFilter filter : viewer.getFilters()) {
if(!filter.select(viewer, parentElement, element)) {
return false;
}
}
return true;
}
protected Collection<Object> getElementsList() {
Collection<Object> result = new LinkedHashSet<Object>();
Set<Object> browsedElements = new HashSet<Object>();
for(Object root : ((IStaticContentProvider)contentProvider).getElements()) {
if(exploreBranch(null, root)) {
result.add(root);
getElementsList(root, result, browsedElements);
}
}
return result;
}
protected void getElementsList(Object parent, Collection<Object> result, Set<Object> browsedElements) {
for(Object child : contentProvider.getChildren(parent)) {
Object childValue = getValue(child);
if(!result.contains(childValue)) { //Avoid infinite recursion
result.add(childValue);
if(exploreBranch(parent, child)) {
getElementsList(child, result, browsedElements);
}
}
}
}
}
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