| /******************************************************************************* |
| * Copyright (c) 2000, 2008 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.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URL; |
| |
| import org.eclipse.core.runtime.FileLocator; |
| import org.eclipse.core.runtime.Path; |
| 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 image descriptor that loads its image information from a file. |
| */ |
| class FileImageDescriptor extends ImageDescriptor { |
| |
| /** |
| * The class whose resource directory contain the file, or <code>null</code> |
| * if none. |
| */ |
| private Class location; |
| |
| /** |
| * The name of the file. |
| */ |
| private String name; |
| |
| /** |
| * Creates a new file image descriptor. The file has the given file name and |
| * is located in the given class's resource directory. If the given class is |
| * <code>null</code>, the file name must be absolute. |
| * <p> |
| * Note that the file is not accessed until its <code>getImageDate</code> |
| * method is called. |
| * </p> |
| * |
| * @param clazz |
| * class for resource directory, or <code>null</code> |
| * @param filename |
| * the name of the file |
| */ |
| FileImageDescriptor(Class clazz, String filename) { |
| this.location = clazz; |
| this.name = filename; |
| } |
| |
| /* |
| * (non-Javadoc) Method declared on Object. |
| */ |
| public boolean equals(Object o) { |
| if (!(o instanceof FileImageDescriptor)) { |
| return false; |
| } |
| FileImageDescriptor other = (FileImageDescriptor) o; |
| if (location != null) { |
| if (!location.equals(other.location)) { |
| return false; |
| } |
| } else { |
| if (other.location != null) { |
| return false; |
| } |
| } |
| return name.equals(other.name); |
| } |
| |
| /** |
| * @see org.eclipse.jface.resource.ImageDescriptor#getImageData() The |
| * FileImageDescriptor implementation of this method is not used by |
| * {@link ImageDescriptor#createImage(boolean, Device)} as of version |
| * 3.4 so that the SWT OS optimised loading can be used. |
| */ |
| public ImageData getImageData() { |
| InputStream in = getStream(); |
| ImageData result = null; |
| 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) { |
| // System.err.println(getClass().getName()+".getImageData(): |
| // "+ |
| // "Exception while closing InputStream : "+e); |
| } |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * Returns a stream on the image contents. Returns null if a stream could |
| * not be opened. |
| * |
| * @return the buffered stream on the file or <code>null</code> if the |
| * file cannot be found |
| */ |
| private InputStream getStream() { |
| InputStream is = null; |
| |
| if (location != null) { |
| is = location.getResourceAsStream(name); |
| |
| } else { |
| try { |
| is = new FileInputStream(name); |
| } catch (FileNotFoundException e) { |
| return null; |
| } |
| } |
| if (is == null) { |
| return null; |
| } |
| return new BufferedInputStream(is); |
| |
| } |
| |
| /* |
| * (non-Javadoc) Method declared on Object. |
| */ |
| public int hashCode() { |
| int code = name.hashCode(); |
| if (location != null) { |
| code += location.hashCode(); |
| } |
| return code; |
| } |
| |
| /* |
| * (non-Javadoc) Method declared on Object. |
| */ |
| /** |
| * The <code>FileImageDescriptor</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 "FileImageDescriptor(location=" + location + ", name=" + name + ")";//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$ |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.jface.resource.ImageDescriptor#createImage(boolean, |
| * org.eclipse.swt.graphics.Device) |
| */ |
| public Image createImage(boolean returnMissingImageOnError, Device device) { |
| String path = getFilePath(); |
| if (path == null) |
| return createDefaultImage(returnMissingImageOnError, device); |
| try { |
| return new Image(device, path); |
| } catch (SWTException exception) { |
| //if we fail try the default way using a stream |
| } |
| return super.createImage(returnMissingImageOnError, device); |
| } |
| |
| /** |
| * Return default image if returnMissingImageOnError is true. |
| * |
| * @param device |
| * @return Image or <code>null</code> |
| */ |
| private Image createDefaultImage(boolean returnMissingImageOnError, |
| Device device) { |
| try { |
| if (returnMissingImageOnError) |
| return new Image(device, DEFAULT_IMAGE_DATA); |
| } catch (SWTException nextException) { |
| return null; |
| } |
| return null; |
| } |
| |
| /** |
| * Returns the filename for the ImageData. |
| * |
| * @return {@link String} or <code>null</code> if the file cannot be found |
| */ |
| private String getFilePath() { |
| |
| if (location == null) |
| return new Path(name).toOSString(); |
| |
| URL resource = location.getResource(name); |
| |
| if (resource == null) |
| return null; |
| try { |
| if (JFaceActivator.getBundleContext() == null) {// Stand-alone case |
| |
| return new Path(resource.getFile()).toOSString(); |
| } |
| return new Path(FileLocator.toFileURL(resource).getPath()).toOSString(); |
| } catch (IOException e) { |
| Policy.logException(e); |
| return null; |
| } |
| } |
| } |