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/*******************************************************************************
* Copyright (c) 2013 Obeo.
* 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:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.emf.compare.ide.ui.internal.util;
import static com.google.common.collect.Iterables.addAll;
import static com.google.common.collect.Sets.newHashSet;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import java.util.Arrays;
import java.util.Set;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.ViewerFilter;
/**
* @author <a href="mailto:mikael.barbero@obeo.fr">Mikael Barbero</a>
*/
public class JFaceUtil {
/**
* All element filter tests must go through this method.
*
* @param viewer
* the viewer
* @param object
* the object to filter
* @param parent
* the parent
* @return true if the element is filtered
*/
public static boolean isFiltered(StructuredViewer viewer, Object object, Object parent) {
for (ViewerFilter filter : viewer.getFilters()) {
if (!filter.select(viewer, parent, object)) {
return true;
}
}
return false;
}
/**
* Return the set of visible elements from the given viewer filtered by the given predicate.
*
* @param treeViewer
* @param predicate
* @return
*/
public static Set<?> filterVisibleElement(TreeViewer treeViewer, Predicate<? super Object> predicate) {
Set<Object> acc = newHashSet();
ITreeContentProvider contentProvider = (ITreeContentProvider)treeViewer.getContentProvider();
Object[] elements = contentProvider.getElements(treeViewer.getInput());
getMatchCount(treeViewer, elements, null, predicate, acc);
return acc;
}
/**
* @param cp
* @param children
* @param diffs
* @return
*/
private static void getMatchCount(TreeViewer treeViewer, Object[] elements, Object parent,
Predicate<? super Object> predicate, Set<Object> acc) {
final ITreeContentProvider cp = (ITreeContentProvider)treeViewer.getContentProvider();
addAll(acc, Iterables.filter(Arrays.asList(elements), predicate));
for (Object element : elements) {
if (!isFiltered(treeViewer, element, parent) && predicate.apply(element)) {
acc.add(element);
}
Object[] children = cp.getChildren(element);
getMatchCount(treeViewer, children, element, predicate, acc);
}
}
}
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