/*
* Copyright 2010 The Rabbit Eclipse Plug-in Project
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package rabbit.ui.internal.viewers;
import static com.google.common.base.Preconditions.checkNotNull;
import org.eclipse.jface.viewers.ContentViewer;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ITreePathContentProvider;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.ui.dialogs.PatternFilter;
/**
* A {@link PatternFilter} that uses {@link TreePath}s. To use this class, the
* viewer's content provider must be an instance of
* {@link ITreePathContentProvider}, and
* {@link ITreePathContentProvider#getParents(Object)} must return an array that
* contains the actual parent of a given element.
*/
public final class TreePathPatternFilter extends PatternFilter {
private final ILabelProvider labelProvider;
public TreePathPatternFilter(ILabelProvider labelProvider) {
this.labelProvider = checkNotNull(labelProvider);
}
@Override
protected boolean isParentMatch(Viewer viewer, Object element) {
ITreePathContentProvider provider = (ITreePathContentProvider)
((ContentViewer) viewer).getContentProvider();
TreePath[] parents = provider.getParents(element);
if (parents == null) {
return false;
}
for (TreePath parent : parents) {
Object[] children = provider.getChildren(parent);
for (Object child : children) {
if (child == element) {
TreePath currentPath = parent.createChildPath(child);
if (isMatch(viewer, currentPath)) {
return true;
}
}
}
}
return false;
}
@Override
protected boolean isLeafMatch(Viewer viewer, Object element) {
String text = labelProvider.getText(element);
if (text != null) {
return wordMatches(text);
}
return false;
}
private boolean isMatch(Viewer viewer, TreePath path) {
if (isLeafMatch(viewer, path.getLastSegment())) {
return true;
}
ITreePathContentProvider provider = (ITreePathContentProvider)
((ContentViewer) viewer).getContentProvider();
Object[] children = provider.getChildren(path);
if (children == null) {
return false;
}
for (Object child : children) {
if (isMatch(viewer, path.createChildPath(child))) {
return true;
}
}
return false;
}
}