/******************************************************************************* * Copyright ? 2008 Sandro Badame. All Rights Reserved. *  * This software and the accompanying materials is available under the  * Eclipse Public License 1.0 (EPL), which accompanies this distribution, and is * available at http://visualjpf.sourceforge.net/epl-v10.html ******************************************************************************/package com.javapathfinder.vjp;import java.io.IOException;import java.net.URL;import org.eclipse.core.runtime.FileLocator;import org.eclipse.core.runtime.Path;import org.eclipse.core.runtime.Status;import org.eclipse.ui.plugin.AbstractUIPlugin;import org.osgi.framework.BundleContext;/** * VJP serves as the main class for the VJP Project. This class serves as a * utility to provide access to the logging and file system for this plugin. *  * @author Sandro Badame */public class VJP extends AbstractUIPlugin {  /**   * This is a unique id for the VJP plugin.   * @see org.eclipse.ui.plugin.AbstractUIPlugin   */  public static final String PLUGIN_ID = "com.javapathfinder.vjp";  /**   * This is a shared singleton instance of the VJP plugin class.   */  private static VJP plugin;    /**   * Returns the shared instance   *    * @return the shared instance   */  public static VJP getDefault() {    return plugin;  }  /**   * Convenience method to log any type of message.   * The code for this log will be Status.OK   */  public static void log(int severity, String message, Throwable exception) {    getDefault().getLog().log(new Status(severity, PLUGIN_ID, Status.OK,                                         message, exception));  }  /**   * Convenience method to log plugin information.   */  public static void logInfo(String message) {    log(Status.INFO, message, null);  }  /**   * Convenience method to log Warnings without an exception This call is   * exactly equivalent to logWarning(message, null) @param message the message   * to include with the warning   */  public static void logWarning(String message) {    logWarning(message, null);  }  /**   * Convenience method to log Warnings along with an exception @param message   * the message to include with the warning @param exception the exception to   * include with the warning   */  public static void logWarning(String message, Exception exception) {    log(Status.WARNING, message, exception);  }  /**   * Convenience method to log errors   * @param message the message to display with this error   * @param exception the exception to associate with ths error.   */  public static void logError(String message, Throwable exception) {    log(Status.ERROR, message, exception);  }      /**   * Convenience method to log errors   * @param message the message to display with this error   */  public static void logError(String message) {    logError(message, new Exception());  }  /**   * Gives an absolute path to the root of the VJP plugin directory   * @return an absolute path to the root of the VJP plugin directory   */  public static String getRootPath() {    try {      return FileLocator.toFileURL(plugin.getBundle().getEntry("/")).getPath();    } catch (IOException e) {      // I don't really know when/how this would happen.      logError("Error finding path to root directory of VJP.", e);      return null;    }  }  /**   * Gives a URL that points to the resource given by the path   * @return a URL pointing to the resource specified. null if the resource   *         doesn't exist.   */  public static URL getResourceURL(String path) {    return FileLocator.find(plugin.getBundle(), new Path(path), null);  }  /**   * The default constructor for this plugin.    * This is usually called by Eclipse and need not be called.   */  public VJP() {    plugin = this;  }  /**   * Used by Eclipse to start the plugin.   * VJP does nothing special here.   *    * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)   */  public void start(BundleContext context) throws Exception {    super.start(context);  }  /**   * Used by Eclipse to stop the plugin.   * VJP only sets its own reference to this plugin to null. (ie: getDefault()   * will return null)   *    * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)   */  public void stop(BundleContext context) throws Exception {    plugin = null;    super.stop(context);  }}