| /******************************************************************************* |
| * Copyright (c) 2003, 2013 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.ant.internal.ui.preferences; |
| |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.regex.Pattern; |
| |
| import org.eclipse.ant.internal.ui.AntUIPlugin; |
| import org.eclipse.core.resources.IContainer; |
| import org.eclipse.core.resources.IFile; |
| import org.eclipse.core.resources.IResource; |
| import org.eclipse.core.resources.ResourcesPlugin; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.jface.viewers.Viewer; |
| import org.eclipse.jface.viewers.ViewerFilter; |
| import org.eclipse.swt.custom.BusyIndicator; |
| |
| public class FileFilter extends ViewerFilter { |
| |
| /** |
| * Objects to filter |
| */ |
| private List<?> fFilter; |
| |
| /** |
| * Collection of files and containers to display |
| */ |
| private Set<IResource> fFiles; |
| |
| private String fExtension; |
| |
| private Pattern fExtnPattern; |
| |
| private boolean fConsiderExtension = true; |
| |
| /** |
| * Creates a new filter that filters the given objects. Note: considerExtension must be called to initialize the filter |
| */ |
| public FileFilter(List<?> objects, String extension) { |
| fFilter = objects; |
| fExtension = extension; |
| if (extension.indexOf('|') > 0) { // Shouldn't be the first char! |
| // This is a pattern; compile and cache it for better performance |
| fExtnPattern = Pattern.compile(fExtension, Pattern.CASE_INSENSITIVE); |
| } else { |
| fExtnPattern = null; |
| } |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @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 parentElement, Object element) { |
| return fFiles.contains(element) && !fFilter.contains(element); |
| } |
| |
| /** |
| * Search for all the matching files in the workspace. |
| */ |
| private void init() { |
| BusyIndicator.showWhile(AntUIPlugin.getStandardDisplay(), () -> { |
| fFiles = new HashSet<>(); |
| traverse(ResourcesPlugin.getWorkspace().getRoot(), fFiles); |
| }); |
| } |
| |
| /** |
| * Traverse the given container, adding files to the given set. Returns whether any files were added |
| */ |
| private boolean traverse(IContainer container, Set<IResource> set) { |
| boolean added = false; |
| try { |
| IResource[] resources = container.members(); |
| for (int i = 0; i < resources.length; i++) { |
| IResource resource = resources[i]; |
| if (resource instanceof IFile) { |
| IFile file = (IFile) resource; |
| String ext = file.getFileExtension(); |
| if (!fConsiderExtension || canAccept(ext)) { |
| set.add(file); |
| added = true; |
| } |
| } else if (resource instanceof IContainer) { |
| if (traverse((IContainer) resource, set)) { |
| set.add(resource); |
| added = true; |
| } |
| } |
| } |
| } |
| catch (CoreException e) { |
| // do nothing |
| } |
| return added; |
| } |
| |
| private boolean canAccept(String ext) { |
| if (ext != null) { |
| if (fExtnPattern == null) { |
| // Accepting only a single extension |
| return fExtension.equalsIgnoreCase(ext); |
| } |
| // Accepting multiple extensions |
| // eg: "xml|ant|ent|macrodef" |
| return fExtnPattern.matcher(ext).matches(); |
| } |
| return false; |
| } |
| |
| /** |
| * Sets whether this filter will filter based on extension. |
| * |
| * @param considerExtension |
| * whether to consider a file's extension when filtering |
| */ |
| public void considerExtension(boolean considerExtension) { |
| fConsiderExtension = considerExtension; |
| init(); |
| } |
| } |