Java tutorial
/******************************************************************************* * Copyright (c) 2009 Fraunhofer IWU 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: * Fraunhofer IWU - initial API and implementation *******************************************************************************/ package net.enilink.commons.ui; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.lang.reflect.Modifier; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.MultiStatus; import org.eclipse.core.runtime.Platform; import org.eclipse.core.runtime.Status; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.resource.ImageRegistry; import org.eclipse.swt.widgets.Display; import org.eclipse.ui.forms.FormColors; import org.eclipse.ui.plugin.AbstractUIPlugin; import org.osgi.framework.Bundle; import org.osgi.framework.BundleContext; import net.enilink.commons.ui.editor.EditorWidgetFactory; /** * The activator class controls the plug-in life cycle */ public class CommonsUi extends AbstractUIPlugin { private static final String ICON_PATH = "icons/"; // The plug-in ID public static final String PLUGIN_ID = "net.enilink.commons.ui"; // The shared instance private static CommonsUi plugin; private EditorWidgetFactory dialogsWidgetFactory; private static Method activateCallback; private static Method deactivateCallback; private static Method runWithDisplay; public static final boolean IS_ECLIPSE_RUNNING; static { boolean result = false; try { result = Platform.isRunning(); } catch (Throwable exception) { // Assume that we aren't running. } IS_ECLIPSE_RUNNING = result; } public static final boolean IS_RAP_RUNNING; static { boolean result = false; if (IS_ECLIPSE_RUNNING) { try { Bundle resourcesBundle = Platform.getBundle("org.eclipse.rap.ui"); result = resourcesBundle != null && (resourcesBundle.getState() & (Bundle.ACTIVE | Bundle.STARTING | Bundle.RESOLVED)) != 0; } catch (Throwable exception) { // Assume that it's not available. } } IS_RAP_RUNNING = result; if (IS_RAP_RUNNING) { try { Class<?> uiCallback = CommonsUi.class.getClassLoader() .loadClass("org.eclipse.rwt.lifecycle.UICallBack"); activateCallback = uiCallback.getMethod("activate", String.class); deactivateCallback = uiCallback.getMethod("deactivate", String.class); runWithDisplay = uiCallback.getMethod("runNonUIThreadWithFakeContext", Display.class, Runnable.class); } catch (Exception e) { // ignore } } } /** * The constructor */ public CommonsUi() { } /* * (non-Javadoc) * * @see * org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext * ) */ public void start(BundleContext context) throws Exception { super.start(context); plugin = this; } /* * (non-Javadoc) * * @see * org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext * ) */ public void stop(BundleContext context) throws Exception { if (dialogsWidgetFactory != null) { dialogsWidgetFactory.dispose(); dialogsWidgetFactory = null; } plugin = null; super.stop(context); } /** * Returns the shared instance * * @return the shared instance */ public static CommonsUi getDefault() { return plugin; } @Override protected void initializeImageRegistry(ImageRegistry registry) { initializeImageRegistry(ICommonImages.class, registry); } private void initializeImageRegistry(Class<?> clazz, ImageRegistry registry) { Field[] fields = clazz.getFields(); for (Field field : fields) { if ((field.getModifiers() & Modifier.STATIC) != 0 && field.getType() == String.class) { try { String relativeImagePath = (String) field.get(null); ImageDescriptor imageDescriptor = null; imageDescriptor = getImageDescriptor(ICON_PATH + relativeImagePath); if (imageDescriptor == null) { imageDescriptor = ImageDescriptor.getMissingImageDescriptor(); } registry.put(relativeImagePath, imageDescriptor); } catch (Exception e) { continue; } } } } /** * Returns an image descriptor for the image file at the given plug-in * relative path. * * @param path * the path * @return the image descriptor */ public static ImageDescriptor getImageDescriptor(String path) { return AbstractUIPlugin.imageDescriptorFromPlugin(PLUGIN_ID, path); //$NON-NLS-1$ } public EditorWidgetFactory getDialogsWidgetFactory() { if (dialogsWidgetFactory == null) { FormColors colors = new FormColors(Display.getCurrent()); colors.setBackground(null); colors.setForeground(null); dialogsWidgetFactory = new EditorWidgetFactory(colors); } return dialogsWidgetFactory; } public static void log(IStatus status) { getDefault().getLog().log(status); } public static void logErrorMessage(String message) { log(new Status(IStatus.ERROR, PLUGIN_ID, 0, message, null)); } public static void logErrorStatus(String message, IStatus status) { if (status == null) { logErrorMessage(message); return; } MultiStatus multi = new MultiStatus(PLUGIN_ID, 0, message, null); multi.add(status); log(multi); } public static void log(Throwable e) { log(new Status(IStatus.ERROR, PLUGIN_ID, 0, "Internal Error", e)); } public static void activateCallback(String id) { if (activateCallback != null) { try { activateCallback.invoke(null, id); } catch (Exception e) { throw new RuntimeException(e); } } } public static void deactivateCallback(String id) { if (deactivateCallback != null) { try { deactivateCallback.invoke(null, id); } catch (Exception e) { throw new RuntimeException(e); } } } public static void runWithDisplay(Display display, Runnable runnable) { if (runWithDisplay != null) { try { runWithDisplay.invoke(null, display, runnable); } catch (Exception e) { throw new RuntimeException(e); } } else { display.asyncExec(runnable); } } }