bundles/org.simantics.ui.workspace.tracker/src/org/simantics/ui/workspace/tracker/internal/Activator.java

   1 package org.simantics.ui.workspace.tracker.internal;
   2
   3 import org.eclipse.core.runtime.preferences.InstanceScope;
   4 import org.eclipse.jface.preference.IPreferenceStore;
   5 import org.eclipse.ui.preferences.ScopedPreferenceStore;
   6 import org.osgi.framework.BundleActivator;
   7 import org.osgi.framework.BundleContext;
   8 import org.osgi.util.tracker.ServiceTracker;
   9 import org.simantics.filesystem.services.sizetracker.DirectorySizeService;
  10 import org.simantics.ui.workspace.tracker.IWorkspaceSizeTrackerConstants;
  11
  12 /**
  13  * @author Tuukka Lehtonen
  14  * @since 1.31.0
  15  */
  16 public class Activator implements BundleActivator {
  17
  18         private static Activator instance;
  19         private static BundleContext context;
  20         private ServiceTracker<DirectorySizeService, DirectorySizeService> tracker;
  21         private IPreferenceStore preferenceStore;
  22
  23         static BundleContext getContext() {
  24                 return context;
  25         }
  26
  27         /*
  28          * (non-Javadoc)
  29          * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
  30          */
  31         public void start(BundleContext bundleContext) throws Exception {
  32                 Activator.instance = this;
  33                 Activator.context = bundleContext;
  34                 tracker = new ServiceTracker<>(bundleContext, DirectorySizeService.class, null);
  35                 tracker.open();
  36         }
  37
  38         /*
  39          * (non-Javadoc)
  40          * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
  41          */
  42         public void stop(BundleContext bundleContext) throws Exception {
  43                 tracker.close();
  44                 Activator.context = null;
  45                 Activator.instance = null;
  46         }
  47
  48         /**
  49          * @return <code>null</code> if service is no longer available
  50          */
  51         public DirectorySizeService getDirectorySizeService() {
  52                 return tracker.getService();
  53         }
  54
  55         public BundleContext getBundleContext() {
  56                 return context;
  57         }
  58
  59         public IPreferenceStore getPreferenceStore() {
  60                 if (preferenceStore == null) {
  61                         preferenceStore = new ScopedPreferenceStore(InstanceScope.INSTANCE, IWorkspaceSizeTrackerConstants.P_NODE);
  62                 }
  63                 return preferenceStore;
  64         }
  65
  66         public static Activator getDefault() {
  67                 return instance;
  68         }
  69
  70 }