diff options
| author | Shireesh Anjal <shireesh@gluster.com> | 2011-02-02 15:10:03 +0530 |
|---|---|---|
| committer | Shireesh Anjal <shireesh@gluster.com> | 2011-02-02 15:10:03 +0530 |
| commit | dfd14c05bc117df8de627c48d4615fc9d995bbe0 (patch) | |
| tree | a1d1d7d043a102d8904cb5ade021c1937172a523 /com.gluster.storage.management.gui/src/com/swtdesigner/ResourceManager.java | |
initial commit
Diffstat (limited to 'com.gluster.storage.management.gui/src/com/swtdesigner/ResourceManager.java')
| -rw-r--r-- | com.gluster.storage.management.gui/src/com/swtdesigner/ResourceManager.java | 405 |
1 files changed, 405 insertions, 0 deletions
diff --git a/com.gluster.storage.management.gui/src/com/swtdesigner/ResourceManager.java b/com.gluster.storage.management.gui/src/com/swtdesigner/ResourceManager.java new file mode 100644 index 00000000..e171da70 --- /dev/null +++ b/com.gluster.storage.management.gui/src/com/swtdesigner/ResourceManager.java @@ -0,0 +1,405 @@ +package com.swtdesigner; + +import java.io.File; +import java.io.InputStream; +import java.lang.reflect.Constructor; +import java.lang.reflect.Method; +import java.net.MalformedURLException; +import java.net.URL; +import java.util.HashMap; +import java.util.Iterator; +import java.util.Map; + +import org.eclipse.core.runtime.Platform; +import org.eclipse.jface.resource.CompositeImageDescriptor; +import org.eclipse.jface.resource.ImageDescriptor; +import org.eclipse.swt.graphics.Image; +import org.eclipse.swt.graphics.Point; +import org.eclipse.swt.graphics.Rectangle; +import org.osgi.framework.Bundle; + +/** + * Utility class for managing OS resources associated with SWT/JFace controls such as colors, fonts, images, + * etc. + * + * !!! IMPORTANT !!! Application code must explicitly invoke the <code>dispose()</code> method to release the + * operating system resources managed by cached objects when those objects and OS resources are no longer + * needed (e.g. on application shutdown) + * + * This class may be freely distributed as part of any application or plugin. + * <p> + * + * @author scheglov_ke + * @author Dan Rubel + */ +public class ResourceManager extends SWTResourceManager { + //////////////////////////////////////////////////////////////////////////// + // + // Image + // + //////////////////////////////////////////////////////////////////////////// + private static Map<ImageDescriptor, Image> m_descriptorImageMap = new HashMap<ImageDescriptor, Image>(); + /** + * Returns an {@link ImageDescriptor} stored in the file at the specified path relative to the specified + * class. + * + * @param clazz + * the {@link Class} relative to which to find the image descriptor. + * @param path + * the path to the image file. + * @return the {@link ImageDescriptor} stored in the file at the specified path. + */ + public static ImageDescriptor getImageDescriptor(Class<?> clazz, String path) { + return ImageDescriptor.createFromFile(clazz, path); + } + /** + * Returns an {@link ImageDescriptor} stored in the file at the specified path. + * + * @param path + * the path to the image file. + * @return the {@link ImageDescriptor} stored in the file at the specified path. + */ + public static ImageDescriptor getImageDescriptor(String path) { + try { + return ImageDescriptor.createFromURL(new File(path).toURI().toURL()); + } catch (MalformedURLException e) { + return null; + } + } + /** + * Returns an {@link Image} based on the specified {@link ImageDescriptor}. + * + * @param descriptor + * the {@link ImageDescriptor} for the {@link Image}. + * @return the {@link Image} based on the specified {@link ImageDescriptor}. + */ + public static Image getImage(ImageDescriptor descriptor) { + if (descriptor == null) { + return null; + } + Image image = m_descriptorImageMap.get(descriptor); + if (image == null) { + image = descriptor.createImage(); + m_descriptorImageMap.put(descriptor, image); + } + return image; + } + /** + * Maps images to decorated images. + */ + @SuppressWarnings("unchecked") + private static Map<Image, Map<Image, Image>>[] m_decoratedImageMap = new Map[LAST_CORNER_KEY]; + /** + * Returns an {@link Image} composed of a base image decorated by another image. + * + * @param baseImage + * the base {@link Image} that should be decorated. + * @param decorator + * the {@link Image} to decorate the base image. + * @return {@link Image} The resulting decorated image. + */ + public static Image decorateImage(Image baseImage, Image decorator) { + return decorateImage(baseImage, decorator, BOTTOM_RIGHT); + } + /** + * Returns an {@link Image} composed of a base image decorated by another image. + * + * @param baseImage + * the base {@link Image} that should be decorated. + * @param decorator + * the {@link Image} to decorate the base image. + * @param corner + * the corner to place decorator image. + * @return the resulting decorated {@link Image}. + */ + public static Image decorateImage(final Image baseImage, final Image decorator, final int corner) { + if (corner <= 0 || corner >= LAST_CORNER_KEY) { + throw new IllegalArgumentException("Wrong decorate corner"); + } + Map<Image, Map<Image, Image>> cornerDecoratedImageMap = m_decoratedImageMap[corner]; + if (cornerDecoratedImageMap == null) { + cornerDecoratedImageMap = new HashMap<Image, Map<Image, Image>>(); + m_decoratedImageMap[corner] = cornerDecoratedImageMap; + } + Map<Image, Image> decoratedMap = cornerDecoratedImageMap.get(baseImage); + if (decoratedMap == null) { + decoratedMap = new HashMap<Image, Image>(); + cornerDecoratedImageMap.put(baseImage, decoratedMap); + } + // + Image result = decoratedMap.get(decorator); + if (result == null) { + final Rectangle bib = baseImage.getBounds(); + final Rectangle dib = decorator.getBounds(); + final Point baseImageSize = new Point(bib.width, bib.height); + CompositeImageDescriptor compositImageDesc = new CompositeImageDescriptor() { + @Override + protected void drawCompositeImage(int width, int height) { + drawImage(baseImage.getImageData(), 0, 0); + if (corner == TOP_LEFT) { + drawImage(decorator.getImageData(), 0, 0); + } else if (corner == TOP_RIGHT) { + drawImage(decorator.getImageData(), bib.width - dib.width, 0); + } else if (corner == BOTTOM_LEFT) { + drawImage(decorator.getImageData(), 0, bib.height - dib.height); + } else if (corner == BOTTOM_RIGHT) { + drawImage(decorator.getImageData(), bib.width - dib.width, bib.height - dib.height); + } + } + @Override + protected Point getSize() { + return baseImageSize; + } + }; + // + result = compositImageDesc.createImage(); + decoratedMap.put(decorator, result); + } + return result; + } + /** + * Dispose all of the cached images. + */ + public static void disposeImages() { + SWTResourceManager.disposeImages(); + // dispose ImageDescriptor images + { + for (Iterator<Image> I = m_descriptorImageMap.values().iterator(); I.hasNext();) { + I.next().dispose(); + } + m_descriptorImageMap.clear(); + } + // dispose decorated images + for (int i = 0; i < m_decoratedImageMap.length; i++) { + Map<Image, Map<Image, Image>> cornerDecoratedImageMap = m_decoratedImageMap[i]; + if (cornerDecoratedImageMap != null) { + for (Map<Image, Image> decoratedMap : cornerDecoratedImageMap.values()) { + for (Image image : decoratedMap.values()) { + image.dispose(); + } + decoratedMap.clear(); + } + cornerDecoratedImageMap.clear(); + } + } + // dispose plugin images + { + for (Iterator<Image> I = m_URLImageMap.values().iterator(); I.hasNext();) { + I.next().dispose(); + } + m_URLImageMap.clear(); + } + } + //////////////////////////////////////////////////////////////////////////// + // + // Plugin images support + // + //////////////////////////////////////////////////////////////////////////// + /** + * Maps URL to images. + */ + private static Map<String, Image> m_URLImageMap = new HashMap<String, Image>(); + /** + * Provider for plugin resources, used by WindowBuilder at design time. + */ + public interface PluginResourceProvider { + URL getEntry(String symbolicName, String path); + } + /** + * Instance of {@link PluginResourceProvider}, used by WindowBuilder at design time. + */ + private static PluginResourceProvider m_designTimePluginResourceProvider = null; + /** + * Returns an {@link Image} based on a plugin and file path. + * + * @param plugin + * the plugin {@link Object} containing the image + * @param name + * the path to the image within the plugin + * @return the {@link Image} stored in the file at the specified path + * + * @deprecated Use {@link #getPluginImage(String, String)} instead. + */ + @Deprecated + public static Image getPluginImage(Object plugin, String name) { + try { + URL url = getPluginImageURL(plugin, name); + if (url != null) { + return getPluginImageFromUrl(url); + } + } catch (Throwable e) { + // Ignore any exceptions + } + return null; + } + /** + * Returns an {@link Image} based on a {@link Bundle} and resource entry path. + * + * @param symbolicName + * the symbolic name of the {@link Bundle}. + * @param path + * the path of the resource entry. + * @return the {@link Image} stored in the file at the specified path. + */ + public static Image getPluginImage(String symbolicName, String path) { + try { + URL url = getPluginImageURL(symbolicName, path); + if (url != null) { + return getPluginImageFromUrl(url); + } + } catch (Throwable e) { + // Ignore any exceptions + } + return null; + } + /** + * Returns an {@link Image} based on given {@link URL}. + */ + private static Image getPluginImageFromUrl(URL url) { + try { + try { + String key = url.toExternalForm(); + Image image = m_URLImageMap.get(key); + if (image == null) { + InputStream stream = url.openStream(); + try { + image = getImage(stream); + m_URLImageMap.put(key, image); + } finally { + stream.close(); + } + } + return image; + } catch (Throwable e) { + // Ignore any exceptions + } + } catch (Throwable e) { + // Ignore any exceptions + } + return null; + } + /** + * Returns an {@link ImageDescriptor} based on a plugin and file path. + * + * @param plugin + * the plugin {@link Object} containing the image. + * @param name + * the path to th eimage within the plugin. + * @return the {@link ImageDescriptor} stored in the file at the specified path. + * + * @deprecated Use {@link #getPluginImageDescriptor(String, String)} instead. + */ + @Deprecated + public static ImageDescriptor getPluginImageDescriptor(Object plugin, String name) { + try { + try { + URL url = getPluginImageURL(plugin, name); + return ImageDescriptor.createFromURL(url); + } catch (Throwable e) { + // Ignore any exceptions + } + } catch (Throwable e) { + // Ignore any exceptions + } + return null; + } + /** + * Returns an {@link ImageDescriptor} based on a {@link Bundle} and resource entry path. + * + * @param symbolicName + * the symbolic name of the {@link Bundle}. + * @param path + * the path of the resource entry. + * @return the {@link ImageDescriptor} based on a {@link Bundle} and resource entry path. + */ + public static ImageDescriptor getPluginImageDescriptor(String symbolicName, String path) { + try { + URL url = getPluginImageURL(symbolicName, path); + if (url != null) { + return ImageDescriptor.createFromURL(url); + } + } catch (Throwable e) { + // Ignore any exceptions + } + return null; + } + /** + * Returns an {@link URL} based on a {@link Bundle} and resource entry path. + */ + private static URL getPluginImageURL(String symbolicName, String path) { + // try runtime plugins + { + Bundle bundle = Platform.getBundle(symbolicName); + if (bundle != null) { + return bundle.getEntry(path); + } + } + // try design time provider + if (m_designTimePluginResourceProvider != null) { + return m_designTimePluginResourceProvider.getEntry(symbolicName, path); + } + // no such resource + return null; + } + /** + * Returns an {@link URL} based on a plugin and file path. + * + * @param plugin + * the plugin {@link Object} containing the file path. + * @param name + * the file path. + * @return the {@link URL} representing the file at the specified path. + * @throws Exception + */ + private static URL getPluginImageURL(Object plugin, String name) throws Exception { + // try to work with 'plugin' as with OSGI BundleContext + try { + Class<?> BundleClass = Class.forName("org.osgi.framework.Bundle"); //$NON-NLS-1$ + Class<?> BundleContextClass = Class.forName("org.osgi.framework.BundleContext"); //$NON-NLS-1$ + if (BundleContextClass.isAssignableFrom(plugin.getClass())) { + Method getBundleMethod = BundleContextClass.getMethod("getBundle", new Class[0]); //$NON-NLS-1$ + Object bundle = getBundleMethod.invoke(plugin, new Object[0]); + // + Class<?> PathClass = Class.forName("org.eclipse.core.runtime.Path"); //$NON-NLS-1$ + Constructor<?> pathConstructor = PathClass.getConstructor(new Class[]{String.class}); + Object path = pathConstructor.newInstance(new Object[]{name}); + // + Class<?> IPathClass = Class.forName("org.eclipse.core.runtime.IPath"); //$NON-NLS-1$ + Class<?> PlatformClass = Class.forName("org.eclipse.core.runtime.Platform"); //$NON-NLS-1$ + Method findMethod = PlatformClass.getMethod("find", new Class[]{BundleClass, IPathClass}); //$NON-NLS-1$ + return (URL) findMethod.invoke(null, new Object[]{bundle, path}); + } + } catch (Throwable e) { + // Ignore any exceptions + } + // else work with 'plugin' as with usual Eclipse plugin + { + Class<?> PluginClass = Class.forName("org.eclipse.core.runtime.Plugin"); //$NON-NLS-1$ + if (PluginClass.isAssignableFrom(plugin.getClass())) { + // + Class<?> PathClass = Class.forName("org.eclipse.core.runtime.Path"); //$NON-NLS-1$ + Constructor<?> pathConstructor = PathClass.getConstructor(new Class[]{String.class}); + Object path = pathConstructor.newInstance(new Object[]{name}); + // + Class<?> IPathClass = Class.forName("org.eclipse.core.runtime.IPath"); //$NON-NLS-1$ + Method findMethod = PluginClass.getMethod("find", new Class[]{IPathClass}); //$NON-NLS-1$ + return (URL) findMethod.invoke(plugin, new Object[]{path}); + } + } + return null; + } + //////////////////////////////////////////////////////////////////////////// + // + // General + // + //////////////////////////////////////////////////////////////////////////// + /** + * Dispose of cached objects and their underlying OS resources. This should only be called when the cached + * objects are no longer needed (e.g. on application shutdown). + */ + public static void dispose() { + disposeColors(); + disposeFonts(); + disposeImages(); + } +}
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