Java tutorial
/** * Copyright (c) 2013-2016 Angelo ZERR. * 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: * Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation */ package tern.eclipse.ide.internal.ui.descriptors; import java.io.File; import java.net.MalformedURLException; import java.net.URL; import java.util.HashMap; import java.util.Map; import org.eclipse.core.resources.IProject; import org.eclipse.core.runtime.IConfigurationElement; import org.eclipse.core.runtime.IExtensionDelta; import org.eclipse.core.runtime.IExtensionRegistry; import org.eclipse.core.runtime.IRegistryChangeEvent; import org.eclipse.core.runtime.IRegistryChangeListener; import org.eclipse.core.runtime.Platform; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.ImageData; import org.eclipse.swt.graphics.ImageLoader; import org.eclipse.swt.widgets.Composite; import tern.eclipse.ide.internal.ui.Trace; import tern.eclipse.ide.internal.ui.controls.TernModuleOptionsPanel; import tern.eclipse.ide.ui.TernUIPlugin; import tern.eclipse.ide.ui.descriptors.ITernModuleDescriptorManager; import tern.eclipse.ide.ui.descriptors.ITernModuleImage; import tern.eclipse.ide.ui.descriptors.options.ITernModuleOptionFactory; import tern.eclipse.jface.images.TernImagesRegistry; import tern.server.ITernModule; import tern.server.protocol.completions.TernCompletionItem; /** * Tern descriptor manager. * */ public class TernModuleDescriptorManager implements ITernModuleDescriptorManager, IRegistryChangeListener { private static final String EXTENSION_TERN_MODULE_DESCRIPTORS = "ternModuleDescriptors"; private static final TernModuleDescriptorManager INSTANCE = new TernModuleDescriptorManager(); private static final String IMAGE_DIR = "tern-images"; //$NON-NLS-1$ // cached copy of all tern module images private Map<String, ITernModuleImage> ternModuleImages; // cached copy of all tern module images private Map<String, ITernModuleOptionFactory> ternModuleOptionFactories; private boolean registryListenerIntialized; private HashMap<ImageDescriptor, URL> fURLMap; private final File fTempDir; private int fImageCount; public static TernModuleDescriptorManager getManager() { return INSTANCE; } public TernModuleDescriptorManager() { this.registryListenerIntialized = false; fURLMap = new HashMap<ImageDescriptor, URL>(); fTempDir = getTempDir(); fImageCount = 0; } @Override public void registryChanged(final IRegistryChangeEvent event) { IExtensionDelta[] deltas = event.getExtensionDeltas(TernUIPlugin.PLUGIN_ID, EXTENSION_TERN_MODULE_DESCRIPTORS); if (deltas != null) { for (IExtensionDelta delta : deltas) handleTernDescriptorDelta(delta); } } @Override public Image getImage(ITernModule module) { return TernImagesRegistry.getImage(module); } @Override public ImageDescriptor getImageDescriptor(ITernModule module) { return TernImagesRegistry.getImageDescriptor(module); } @Override public Composite createOptionsPanel(Composite parent, ITernModule module, IProject project) { return new TernModuleOptionsPanel(parent, module, project); } @Override public ITernModuleImage getTernModuleImage(String id) { if (ternModuleImages == null) loadTernDescriptors(); return ternModuleImages.get(id); } @Override public ITernModuleOptionFactory getTernModuleOptionFactory(String id) { if (ternModuleOptionFactories == null) loadTernDescriptors(); return ternModuleOptionFactories.get(id); } /** * Load the Nodejs installs. */ private synchronized void loadTernDescriptors() { if (ternModuleImages != null) return; Trace.trace(Trace.EXTENSION_POINT, "->- Loading .ternModuleDescriptors extension point ->-"); IExtensionRegistry registry = Platform.getExtensionRegistry(); IConfigurationElement[] cf = registry.getConfigurationElementsFor(TernUIPlugin.PLUGIN_ID, EXTENSION_TERN_MODULE_DESCRIPTORS); Map<String, ITernModuleOptionFactory> optionFactories = new HashMap<String, ITernModuleOptionFactory>(); Map<String, ITernModuleImage> images = new HashMap<String, ITernModuleImage>(); addTernDescriptors(cf, images, optionFactories); addRegistryListenerIfNeeded(); ternModuleImages = images; ternModuleOptionFactories = optionFactories; Trace.trace(Trace.EXTENSION_POINT, "-<- Done loading .ternModuleDescriptors extension point -<-"); } /** * Load the Nodejs installs. * * @param optionFactories */ private synchronized void addTernDescriptors(IConfigurationElement[] cf, Map<String, ITernModuleImage> images, Map<String, ITernModuleOptionFactory> optionFactories) { for (IConfigurationElement ce : cf) { try { if ("optionFactory".equals(ce.getName())) { String id = ce.getAttribute("id"); ITernModuleOptionFactory factory = (ITernModuleOptionFactory) ce .createExecutableExtension("class"); optionFactories.put(id, factory); } else if ("image".equals(ce.getName())) { TernModuleImage ternDescriptor = new TernModuleImage(ce); images.put(ternDescriptor.getId(), ternDescriptor); } Trace.trace(Trace.EXTENSION_POINT, " Loaded ternDescriptor: " + ce.getAttribute("id")); } catch (Throwable t) { Trace.trace(Trace.SEVERE, " Could not load ternDescriptor: " + ce.getAttribute("id"), t); } } } protected void handleTernDescriptorDelta(IExtensionDelta delta) { if (ternModuleImages == null) // not loaded yet return; IConfigurationElement[] cf = delta.getExtension().getConfigurationElements(); Map<String, ITernModuleOptionFactory> optionFactories = new HashMap<String, ITernModuleOptionFactory>(); Map<String, ITernModuleImage> images = new HashMap<String, ITernModuleImage>(); if (delta.getKind() == IExtensionDelta.ADDED) { addTernDescriptors(cf, images, optionFactories); } else { // int size = list.size(); // TernModuleImage[] st = new TernModuleImage[size]; // int size2 = cf.length; // // for (int i = 0; i < size; i++) { // for (int j = 0; j < size2; j++) { // if (st[i].getId().equals(cf[j].getAttribute("id"))) { // st[i].dispose(); // list.remove(st[i]); // } // } // } } ternModuleImages = images; ternModuleOptionFactories = optionFactories; } private void addRegistryListenerIfNeeded() { if (registryListenerIntialized) return; IExtensionRegistry registry = Platform.getExtensionRegistry(); registry.addRegistryChangeListener(this, TernUIPlugin.PLUGIN_ID); registryListenerIntialized = true; } public void initialize() { } public void destroy() { Platform.getExtensionRegistry().removeRegistryChangeListener(this); if (fTempDir != null) { delete(fTempDir); } fURLMap = null; } @Override public Image getImage(TernCompletionItem item) { // Retrieve the JS type (boolean, array, string, number, or fn). String jsType = TernImagesRegistry.getJSType(item, true); // Retrieve the origin name (ex : yui instead of using yui3) ITernModule module = item.getTernModule(); return TernImagesRegistry.getImage(jsType, module); } @Override public ImageDescriptor getImageDescriptor(TernCompletionItem item) { // Retrieve the JS type (boolean, array, string, number, or fn). String jsType = TernImagesRegistry.getJSType(item, true); // Retrieve the origin name (ex : yui instead of using yui3) ITernModule module = item.getTernModule(); return TernImagesRegistry.getImageDescriptor(jsType, module); } private File getTempDir() { try { File imageDir = TernUIPlugin.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()) { Trace.trace(Trace.SEVERE, "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(); } public URL getImageURL(ImageDescriptor descriptor) { if (fTempDir == null) return null; 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) { Trace.trace(Trace.SEVERE, "Failed to create image directory ", e); //$NON-NLS-1$ } 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++; } }