Java tutorial
/******************************************************************************* * Copyright (c) 2011 isandlaTech, Thomas Calmant * 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: * Thomas Calmant (isandlaTech) - initial API and implementation *******************************************************************************/ package org.isandlatech.plugins.rest; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import org.eclipse.core.runtime.FileLocator; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Path; import org.eclipse.core.runtime.Platform; import org.eclipse.core.runtime.Status; import org.eclipse.core.runtime.content.IContentType; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.ImageData; import org.eclipse.ui.plugin.AbstractUIPlugin; import org.isandlatech.plugins.rest.editor.scanners.RestPartitionScanner; import org.isandlatech.plugins.rest.i18n.Messages; import org.osgi.framework.BundleContext; /** * The activator class controls the plug-in life cycle * * @author Thomas Calmant */ public class RestPlugin extends AbstractUIPlugin { /** The plug-in ID */ public static final String PLUGIN_ID = "ReSTEditor"; /** The plug-in name */ public static final String PLUGIN_NAME = Messages.getString("plugin.name"); /** * The specific rest content-type id (cf. full qualified id : PLUGIN_ID + * content-type id as defined in plug-in xml file) **/ public static final String REST_CONTENT_ID = PLUGIN_ID + ".restSource"; /** * @see the definition of this content type in the extension point * "org.eclipse.core.contenttype.contentTypes" in the manifest file of * the plug-in. */ public static final IContentType REST_CONTENT_TYPE = Platform.getContentTypeManager() .getContentType(REST_CONTENT_ID); /** The shared instance */ private static RestPlugin sPlugin; /** * Returns the shared instance * * @return the shared instance */ public static RestPlugin getDefault() { return sPlugin; } /** * 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(final String path) { return imageDescriptorFromPlugin(PLUGIN_ID, path); } /** * Logs the given status * * @param aStatus * Status to be logged */ public static void log(final IStatus aStatus) { sPlugin.getLog().log(aStatus); } /** * Logs the given error * * @param aMessage * Error message * @param aThrowable * Associated exception or error */ public static void logError(final String aMessage, final Throwable aThrowable) { IStatus status = new Status(IStatus.ERROR, PLUGIN_ID, aMessage, aThrowable); sPlugin.getLog().log(status); } /** * Logs the given information * * @param aMessage * Message to be logged */ public static void logInfo(final String aMessage) { IStatus status = new Status(IStatus.INFO, PLUGIN_ID, aMessage); sPlugin.getLog().log(status); } /** * Logs the given warning * * @param aMessage * Message to be logged */ public static void logWarning(final String aMessage) { IStatus status = new Status(IStatus.WARNING, PLUGIN_ID, aMessage); sPlugin.getLog().log(status); } /** * Makes a new image which is a 45 counter-clockwise rotation of the given * one * * @param aImage * Base image * @return A rotated image */ public static ImageDescriptor rotateImage(final Image aImage) { ImageData srcData = aImage.getImageData(); if (srcData == null) { return null; } ImageData destData = new ImageData(srcData.height, srcData.width, srcData.depth, srcData.palette); /* rotate by rearranging the pixels */ for (int i = 0; i < srcData.width; i++) { for (int j = 0; j < srcData.height; j++) { // Color int pixel = srcData.getPixel(i, j); destData.setPixel(j, srcData.width - 1 - i, pixel); // Transparency int alpha = srcData.getAlpha(i, j); destData.setAlpha(j, srcData.width - 1 - i, alpha); } } return ImageDescriptor.createFromImageData(destData); } /** The partition scanner */ private RestPartitionScanner pPartitionScanner; /** * The constructor */ public RestPlugin() { } /** * Reads the given file in the bundle * * @param aFilePath * File path, '/' is the root of the bundle JAR file * @return The file content * @throws IOException * An error occurred while opening the file stream */ public String getBundleFileContent(final String aFilePath) throws IOException { // Open the file BufferedReader reader = getBundleFileReader(aFilePath); // Read it StringBuilder content = new StringBuilder(); int charsRead = 0; char[] buffer = new char[2048]; while ((charsRead = reader.read(buffer)) > 0) { content.append(buffer, 0, charsRead); } // Close it reader.close(); return content.toString(); } /** * Opens a buffered reader for the given file in the bundle * * @param aFilePath * File path, '/' is the root of the bundle JAR file * @return A buffered reader for the requested file * @throws IOException * An error occurred while opening the file stream */ public BufferedReader getBundleFileReader(final String aFilePath) throws IOException { // Read the template file Path templatePath = new Path(aFilePath); InputStream templateStream = FileLocator.openStream(getBundle(), templatePath, false); return new BufferedReader(new InputStreamReader(templateStream)); } /** * Retrieves the plugin-instance unique partition scanner * * @return The partition scanner */ public RestPartitionScanner getPartitionScanner() { if (pPartitionScanner == null) { pPartitionScanner = new RestPartitionScanner(); } return pPartitionScanner; } /* * (non-Javadoc) * * @see * org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext * ) */ @Override public void start(final BundleContext context) throws Exception { super.start(context); sPlugin = this; } /* * (non-Javadoc) * * @see * org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext * ) */ @Override public void stop(final BundleContext context) throws Exception { sPlugin = null; super.stop(context); } }