| /******************************************************************************* |
| * Copyright (c) 2000, 2006 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.jface.resource; |
| |
| import java.io.BufferedInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URL; |
| |
| import org.eclipse.core.runtime.FileLocator; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Path; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.jface.internal.JFaceActivator; |
| import org.eclipse.jface.util.Policy; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.SWTException; |
| import org.eclipse.swt.graphics.Device; |
| import org.eclipse.swt.graphics.Image; |
| import org.eclipse.swt.graphics.ImageData; |
| |
| /** |
| * An ImageDescriptor that gets its information from a URL. This class is not |
| * public API. Use ImageDescriptor#createFromURL to create a descriptor that |
| * uses a URL. |
| */ |
| class URLImageDescriptor extends ImageDescriptor { |
| /** |
| * Constant for the file protocol for optimized loading |
| */ |
| private static final String FILE_PROTOCOL = "file"; //$NON-NLS-1$ |
| private URL url; |
| |
| /** |
| * Creates a new URLImageDescriptor. |
| * |
| * @param url |
| * The URL to load the image from. Must be non-null. |
| */ |
| URLImageDescriptor(URL url) { |
| this.url = url; |
| } |
| |
| /* |
| * (non-Javadoc) Method declared on Object. |
| */ |
| public boolean equals(Object o) { |
| if (!(o instanceof URLImageDescriptor)) { |
| return false; |
| } |
| return ((URLImageDescriptor) o).url.equals(this.url); |
| } |
| |
| /* |
| * (non-Javadoc) Method declared on ImageDesciptor. Returns null if the |
| * image data cannot be read. |
| */ |
| public ImageData getImageData() { |
| ImageData result = null; |
| InputStream in = getStream(); |
| if (in != null) { |
| try { |
| result = new ImageData(in); |
| } catch (SWTException e) { |
| if (e.code != SWT.ERROR_INVALID_IMAGE) { |
| throw e; |
| // fall through otherwise |
| } |
| } finally { |
| try { |
| in.close(); |
| } catch (IOException e) { |
| Policy.getLog().log( |
| new Status(IStatus.ERROR, Policy.JFACE, e |
| .getLocalizedMessage(), e)); |
| } |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * Returns a stream on the image contents. Returns null if a stream could |
| * not be opened. |
| * |
| * @return the stream for loading the data |
| */ |
| protected InputStream getStream() { |
| try { |
| return new BufferedInputStream(url.openStream()); |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| |
| /* |
| * (non-Javadoc) Method declared on Object. |
| */ |
| public int hashCode() { |
| return url.hashCode(); |
| } |
| |
| /* |
| * (non-Javadoc) Method declared on Object. |
| */ |
| /** |
| * The <code>URLImageDescriptor</code> implementation of this |
| * <code>Object</code> method returns a string representation of this |
| * object which is suitable only for debugging. |
| */ |
| public String toString() { |
| return "URLImageDescriptor(" + url + ")"; //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| |
| /** |
| * Returns the filename for the ImageData. |
| * |
| * @return {@link String} or <code>null</code> if the file cannot be found |
| */ |
| private String getFilePath() { |
| |
| try { |
| if (JFaceActivator.getBundleContext() == null) { |
| if (FILE_PROTOCOL.equalsIgnoreCase(url.getProtocol())) |
| return new Path(url.getFile()).toOSString(); |
| return null; |
| } |
| |
| URL locatedURL = FileLocator.toFileURL(url); |
| if (FILE_PROTOCOL.equalsIgnoreCase(locatedURL.getProtocol())) |
| return new Path(locatedURL.getPath()).toOSString(); |
| return null; |
| |
| } catch (IOException e) { |
| Policy.logException(e); |
| return null; |
| } |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.jface.resource.ImageDescriptor#createImage(boolean, |
| * org.eclipse.swt.graphics.Device) |
| */ |
| public Image createImage(boolean returnMissingImageOnError, Device device) { |
| |
| // Try to see if we can optimize using SWTs file based image support. |
| String path = getFilePath(); |
| if (path == null) |
| return super.createImage(returnMissingImageOnError, device); |
| |
| try { |
| return new Image(device, path); |
| } catch (SWTException exception) { |
| // If we fail fall back to the slower input stream method. |
| } |
| return super.createImage(returnMissingImageOnError, device); |
| } |
| |
| } |