| /******************************************************************************* |
| * Copyright (c) 2004, 2008 Tasktop Technologies and others. |
| * 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: |
| * Tasktop Technologies - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.mylyn.internal.context.ui.views; |
| |
| import org.eclipse.jface.viewers.ILabelProvider; |
| import org.eclipse.jface.viewers.ITreeContentProvider; |
| import org.eclipse.jface.viewers.TreeViewer; |
| import org.eclipse.jface.viewers.Viewer; |
| import org.eclipse.jface.viewers.ViewerFilter; |
| import org.eclipse.mylyn.context.ui.InterestFilter; |
| import org.eclipse.ui.internal.misc.StringMatcher; |
| |
| /** |
| * Derived from {@link QuickOutlinePatternAndInterestFilter} |
| * |
| * @author Mik Kersten |
| */ |
| public class QuickOutlinePatternAndInterestFilter extends ViewerFilter { |
| |
| private final InterestFilter interestFilter = new InterestFilter(); |
| |
| private StringMatcher stringMatcher; |
| |
| public QuickOutlinePatternAndInterestFilter() { |
| stringMatcher = null; |
| } |
| |
| @Override |
| public boolean select(Viewer viewer, Object parentElement, Object element) { |
| boolean isInteresting = interestFilter.select(viewer, parentElement, element); |
| if (!isInteresting) { |
| return false; |
| } else { |
| // Element passes the filter if the string matcher is undefined or |
| // the |
| // viewer is not a tree viewer |
| if ((stringMatcher == null) || ((viewer instanceof TreeViewer) == false)) { |
| return true; |
| } |
| TreeViewer treeViewer = (TreeViewer) viewer; |
| // Match the pattern against the label of the given element |
| String matchName = ((ILabelProvider) treeViewer.getLabelProvider()).getText(element); |
| // Element passes the filter if it matches the pattern |
| if ((matchName != null) && stringMatcher.match(matchName)) { |
| return true; |
| } |
| // Determine whether the element has children that pass the filter |
| return hasUnfilteredChild(treeViewer, element); |
| } |
| } |
| |
| /** |
| * @param viewer |
| * @param element |
| * @return |
| */ |
| private boolean hasUnfilteredChild(TreeViewer viewer, Object element) { |
| // No point calling hasChildren() because the operation is the same cost |
| // as getting the children |
| // If the element has a child that passes the filter, then we want to |
| // keep the parent around - even if it does not pass the filter itself |
| Object[] children = ((ITreeContentProvider) viewer.getContentProvider()).getChildren(element); |
| for (Object element2 : children) { |
| if (select(viewer, element, element2)) { |
| return true; |
| } |
| } |
| // Element does not pass the filter |
| return false; |
| } |
| |
| public void setStringMatcher(StringMatcher stringMatcher) { |
| this.stringMatcher = stringMatcher; |
| } |
| |
| } |