org.eclipse.jface.resource.FileImageDescriptor Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 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
* EclipseSource - adaptation for RAP
******************************************************************************/
package org.eclipse.jface.resource;
import static org.eclipse.rap.rwt.internal.service.ContextProvider.getApplicationContext;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.util.Policy;
import org.eclipse.rap.rwt.internal.service.ContextProvider;
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;
import org.eclipse.swt.internal.graphics.ImageFactory;
/**
* An image descriptor that loads its image information from a file.
*/
class FileImageDescriptor extends ImageDescriptor {
/**
* The class whose resource directory contain the file, or null
* 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
* null, the file name must be absolute.
*
* Note that the file is not accessed until its getImageDate
* method is called.
*
*
* @param clazz
* class for resource directory, or null
* @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;
}
// RAP [bm] alternative to ImageData for performance reasons
public Image createImage(boolean returnMissingImageOnError, Device device) {
Image result = null;
if( location != null ) {
String path = location.getPackage().getName().replace( '.', '/' )
+ "/" //$NON-NLS-1$
+ name;
InputStream inputStream = getStream();
if( inputStream != null ) {
try {
ImageFactory imageFactory = getApplicationContext().getImageFactory();
result = imageFactory.createImage( device, path, inputStream );
} finally {
try {
inputStream.close();
} catch( IOException e ) {
Policy.getLog().log( new Status( IStatus.ERROR,
Policy.JFACE,
e.getMessage(),
e ) );
}
}
} else if( returnMissingImageOnError ) {
try {
result = new Image( device, DEFAULT_IMAGE_DATA );
} catch ( SWTException nextException ) {
result = null;
}
}
}
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 null 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 FileImageDescriptor implementation of this
* Object 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 null
// */
// 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 null 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 (!InternalPolicy.OSGI_AVAILABLE) {// 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;
// }
// }
}