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