org.eclipse.linuxtools.lttng2.ui/src/org/eclipse/linuxtools/internal/lttng2/ui/Activator.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Francois Chouinard - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.linuxtools.internal.lttng2.ui;
  14
  15 import java.net.URL;
  16
  17 import org.eclipse.jface.resource.ImageDescriptor;
  18 import org.eclipse.jface.resource.ImageRegistry;
  19 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.preferences.ControlPreferences;
  20 import org.eclipse.swt.graphics.Image;
  21 import org.eclipse.ui.plugin.AbstractUIPlugin;
  22 import org.osgi.framework.BundleContext;
  23
  24 /**
  25  * The activator class controls the plug-in life cycle
  26  */
  27 public class Activator extends AbstractUIPlugin {
  28
  29     // ------------------------------------------------------------------------
  30     // Attributes
  31     // ------------------------------------------------------------------------
  32
  33     /**
  34      *  The plug-in ID
  35      */
  36     public static final String PLUGIN_ID = "org.eclipse.linuxtools.lttng2.ui"; //$NON-NLS-1$
  37
  38     /**
  39      *  The shared instance
  40      */
  41     private static Activator plugin;
  42
  43     // ------------------------------------------------------------------------
  44     // Constructors
  45     // ------------------------------------------------------------------------
  46
  47     /**
  48      * The constructor
  49      */
  50     public Activator() {
  51     }
  52
  53     // ------------------------------------------------------------------------
  54     // Accessors
  55     // ------------------------------------------------------------------------
  56
  57     /**
  58      * Returns the shared instance
  59      *
  60      * @return the shared instance
  61      */
  62     public static Activator getDefault() {
  63         return plugin;
  64     }
  65
  66     // ------------------------------------------------------------------------
  67     // AbstractUIPlugin
  68     // ------------------------------------------------------------------------
  69
  70     /* (non-Javadoc)
  71      * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)
  72      */
  73     @Override
  74     public void start(BundleContext context) throws Exception {
  75         super.start(context);
  76         plugin = this;
  77         ControlPreferences.getInstance().init(getPreferenceStore());
  78     }
  79
  80     /* (non-Javadoc)
  81      * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
  82      */
  83     @Override
  84     public void stop(BundleContext context) throws Exception {
  85         ControlPreferences.getInstance().dispose();
  86         plugin = null;
  87         super.stop(context);
  88     }
  89
  90     /* (non-Javadoc)
  91      * @see org.eclipse.ui.plugin.AbstractUIPlugin#initializeImageRegistry(org.eclipse.jface.resource.ImageRegistry)
  92      */
  93     @Override
  94     protected void initializeImageRegistry(ImageRegistry reg) {
  95     }
  96
  97     // ------------------------------------------------------------------------
  98     // Operations
  99     // ------------------------------------------------------------------------
 100
 101     public Image getImageFromPath(String path) {
 102         return getImageDescripterFromPath(path).createImage();
 103     }
 104
 105     public ImageDescriptor getImageDescripterFromPath(String path) {
 106         return AbstractUIPlugin.imageDescriptorFromPlugin(PLUGIN_ID, path);
 107     }
 108
 109     public Image getImageFromImageRegistry(String path) {
 110         Image icon = getImageRegistry().get(path);
 111         if (icon == null) {
 112             icon = getImageDescripterFromPath(path).createImage();
 113             plugin.getImageRegistry().put(path, icon);
 114         }
 115         return icon;
 116     }
 117
 118     /**
 119      * Loads the image in the plug-ins image registry (if necessary) and returns the image
 120      * @param url - URL relative to the Bundle
 121      * @return  the image
 122      */
 123     public Image loadIcon(String url) {
 124         String key = plugin.getBundle().getSymbolicName() + "/" + url; //$NON-NLS-1$
 125         Image icon = plugin.getImageRegistry().get(key);
 126         if (icon == null) {
 127             URL imageURL = plugin.getBundle().getResource(url);
 128             ImageDescriptor descriptor = ImageDescriptor.createFromURL(imageURL);
 129             icon = descriptor.createImage();
 130             plugin.getImageRegistry().put(key, icon);
 131         }
 132         return icon;
 133     }
 134
 135 }