| /******************************************************************************* |
| * Copyright (c) 2000, 2012 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.ui.filters; |
| |
| import org.eclipse.jface.viewers.StructuredViewer; |
| import org.eclipse.jface.viewers.Viewer; |
| import org.eclipse.jface.viewers.ViewerFilter; |
| |
| import org.eclipse.jdt.core.IPackageFragment; |
| import org.eclipse.jdt.core.JavaModelException; |
| |
| |
| /** |
| * Filters out all empty package fragments. |
| */ |
| public class EmptyPackageFilter extends ViewerFilter { |
| |
| /* |
| * @see org.eclipse.jface.viewers.ViewerFilter#select(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object) |
| */ |
| @Override |
| public boolean select(Viewer viewer, Object parent, Object element) { |
| if (element instanceof IPackageFragment) { |
| IPackageFragment pkg= (IPackageFragment)element; |
| try { |
| return pkg.hasChildren() || hasUnfilteredResources(viewer, pkg); |
| } catch (JavaModelException e) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Tells whether the given package has unfiltered resources. |
| * |
| * @param viewer the viewer |
| * @param pkg the package |
| * @return <code>true</code> if the package has unfiltered resources |
| * @throws JavaModelException if this element does not exist or if an exception occurs while |
| * accessing its corresponding resource |
| * @since 3.4.1 |
| */ |
| static boolean hasUnfilteredResources(Viewer viewer, IPackageFragment pkg) throws JavaModelException { |
| Object[] resources= pkg.getNonJavaResources(); |
| int length= resources.length; |
| if (length == 0) |
| return false; |
| |
| if (!(viewer instanceof StructuredViewer)) |
| return true; |
| |
| ViewerFilter[] filters= ((StructuredViewer)viewer).getFilters(); |
| resourceLoop: for (int i= 0; i < length; i++) { |
| for (int j= 0; j < filters.length; j++) { |
| if (!filters[j].select(viewer, pkg, resources[i])) |
| continue resourceLoop; |
| } |
| return true; |
| |
| } |
| return false; |
| } |
| |
| |
| } |