/*******************************************************************************
* This file is part of the Twig eclipse plugin.
*
* (c) Robert Gruendler <r.gruendler@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
******************************************************************************/
package com.dubture.twig.ui.viewsupport;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import org.eclipse.dltk.ui.ScriptElementImageProvider;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.ImageLoader;
import com.dubture.twig.ui.TwigUICorePlugin;
/**
* Image registry that keeps its images on the local file system.
*
* @since 3.4
*/
@SuppressWarnings("rawtypes")
public class ImagesOnFileSystemRegistry
{
private static final String IMAGE_DIR = "twig-images"; //$NON-NLS-1$
private HashMap fURLMap;
private final File fTempDir;
private int fImageCount;
public ImagesOnFileSystemRegistry()
{
fURLMap = new HashMap();
fTempDir = getTempDir();
new ScriptElementImageProvider();
fImageCount = 0;
}
private File getTempDir()
{
try {
File imageDir = TwigUICorePlugin.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()) {
// SymfonyUiPlugin
// .logErrorMessage("Failed to create image directory " + imageDir.toString()); //$NON-NLS-1$
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();
}
@SuppressWarnings("unchecked")
public URL getImageURL(ImageDescriptor descriptor)
{
if (fTempDir == null)
return null;
URL 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) {
// SymfonyUiPlugin.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;
}
}