| /******************************************************************************* |
| * Copyright (c) 2008, 2017 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.dltk.ui.viewsupport; |
| |
| import java.io.File; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.util.HashMap; |
| |
| import org.eclipse.dltk.ui.DLTKUIPlugin; |
| import org.eclipse.jface.resource.ImageDescriptor; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.graphics.ImageData; |
| import org.eclipse.swt.graphics.ImageLoader; |
| |
| /** |
| * Image registry that keeps its images on the local file system. |
| * |
| * @since 4.0 |
| */ |
| public class ImagesOnFileSystemRegistry { |
| |
| private static final String IMAGE_DIR = "dltk-images"; //$NON-NLS-1$ |
| |
| private HashMap<ImageDescriptor, URL> fURLMap; |
| private final File fTempDir; |
| private int fImageCount; |
| |
| public ImagesOnFileSystemRegistry() { |
| fURLMap = new HashMap<>(); |
| fTempDir = getTempDir(); |
| fImageCount = 0; |
| } |
| |
| private File getTempDir() { |
| try { |
| File imageDir = DLTKUIPlugin.getDefault().getStateLocation() |
| .append(IMAGE_DIR).toFile(); |
| if (imageDir.exists()) { |
| // has not been deleted on previous shutdown |
| delete(imageDir); |
| } |
| if (!imageDir.exists()) { |
| imageDir.mkdir(); |
| } |
| if (!imageDir.isDirectory()) { |
| DLTKUIPlugin.logErrorMessage("Failed to create image directory " //$NON-NLS-1$ |
| + imageDir.toString()); |
| return null; |
| } |
| return imageDir; |
| } catch (IllegalStateException e) { |
| // no state location |
| return null; |
| } |
| } |
| |
| private void delete(File file) { |
| if (file.isDirectory()) { |
| File[] listFiles = file.listFiles(); |
| for (int i = 0; i < listFiles.length; i++) { |
| delete(listFiles[i]); |
| } |
| } |
| file.delete(); |
| } |
| |
| public URL getImageURL(ImageDescriptor descriptor) { |
| if (fTempDir == null) |
| return null; |
| |
| URL url = fURLMap.get(descriptor); |
| if (url != null) |
| return url; |
| |
| File imageFile = getNewFile(); |
| ImageData imageData = descriptor.getImageData(); |
| if (imageData == null) { |
| return null; |
| } |
| |
| ImageLoader loader = new ImageLoader(); |
| loader.data = new ImageData[] { imageData }; |
| loader.save(imageFile.getAbsolutePath(), SWT.IMAGE_PNG); |
| |
| try { |
| url = imageFile.toURI().toURL(); |
| fURLMap.put(descriptor, url); |
| return url; |
| } catch (MalformedURLException e) { |
| DLTKUIPlugin.log(e); |
| } |
| return null; |
| } |
| |
| private File getNewFile() { |
| File file; |
| do { |
| file = new File(fTempDir, String.valueOf(getImageCount()) + ".png"); //$NON-NLS-1$ |
| } while (file.exists()); |
| return file; |
| } |
| |
| private synchronized int getImageCount() { |
| return fImageCount++; |
| } |
| |
| public void dispose() { |
| if (fTempDir != null) { |
| delete(fTempDir); |
| } |
| fURLMap = null; |
| } |
| } |