Examples of org.osgi.service.prefs.Preferences

org.osgi.service.prefs.Preferences
A node in a hierarchical collection of preference data.
This interface allows applications to store and retrieve user and system preference data. This data is stored persistently in an implementation-dependent backing store. Typical implementations include flat files, OS-specific registries, directory servers and SQL databases.
For each bundle, there is a separate tree of nodes for each user, and one for system preferences. The precise description of "user" and "system" will vary from one bundle to another. Typical information stored in the user preference tree might include font choice, and color choice for a bundle which interacts with the user via a servlet. Typical information stored in the system preference tree might include installation data, or things like high score information for a game program.
Nodes in a preference tree are named in a similar fashion to directories in a hierarchical file system. Every node in a preference tree has a node name (which is not necessarily unique), a unique absolute path name , and a path name relative to each ancestor including itself.
The root node has a node name of the empty {@code String} object (""). Everyother node has an arbitrary node name, specified at the time it is created. The only restrictions on this name are that it cannot be the empty string, and it cannot contain the slash character ('/').
The root node has an absolute path name of {@code "/"}. Children of the root node have absolute path names of {@code "/" + } <node name> .All other nodes have absolute path names of <parent's absolute path name> {@code + "/" + } <node name> . Note that allabsolute path names begin with the slash character.
A node n 's path name relative to its ancestor a is simply the string that must be appended to a 's absolute path name in order to form n 's absolute path name, with the initial slash character (if present) removed. Note that:
- No relative path names begin with the slash character.
- Every node's path name relative to itself is the empty string.
- Every node's path name relative to its parent is its node name (except for the root node, which does not have a parent).
- Every node's path name relative to the root is its absolute path name with the initial slash character removed.
Note finally that:
- No path name contains multiple consecutive slash characters.
- No path name with the exception of the root's absolute path name end in the slash character.
- Any string that conforms to these two rules is a valid path name.
Each {@code Preference} node has zero or more properties associated with it,where a property consists of a name and a value. The bundle writer is free to choose any appropriate names for properties. Their values can be of type {@code String}, {@code long}, {@code int}, {@code boolean}, {@code byte[]}, {@code float}, or {@code double} but they can always be accessed as if theywere {@code String} objects.
All node name and property name comparisons are case-sensitive.
All of the methods that modify preference data are permitted to operate asynchronously; they may return immediately, and changes will eventually propagate to the persistent backing store, with an implementation-dependent delay. The {@code flush} method may be used to synchronously force updates tothe backing store.
Implementations must automatically attempt to flush to the backing store any pending updates for a bundle's preferences when the bundle is stopped or otherwise ungets the Preferences Service.
The methods in this class may be invoked concurrently by multiple threads in a single Java Virtual Machine (JVM) without the need for external synchronization, and the results will be equivalent to some serial execution. If this class is used concurrently by multiple JVMs that store their preference data in the same backing store, the data store will not be corrupted, but no other guarantees are made concerning the consistency of the preference data. @noimplement @author $Id: faefeec3c75c0a45324035226f71728f69358cd4 $

        return sl;
    }


    public Component registerComponent(Bundle bundle, ComponentDesc componentDesc, javax.jbi.component.Component innerComponent, SharedLibrary[] sharedLibraries) throws Exception {
        String name = componentDesc.getIdentification().getName();
        Preferences prefs = preferencesService.getUserPreferences(name);
        ComponentImpl component = new ComponentImpl(bundle, componentDesc, innerComponent, prefs, autoStart, sharedLibraries);
        component.setListenerRegistry(listenerRegistry);
        // populate props from the component meta-data
        Dictionary<String, String> props = new Hashtable<String, String>();
        props.put(NAME, name);

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        return component;
    }


    public ServiceAssembly registerServiceAssembly(Bundle bundle, ServiceAssemblyDesc serviceAssemblyDesc, List<ServiceUnitImpl> sus) throws Exception {
        // Now create the SA and initialize it
        Preferences prefs = preferencesService.getUserPreferences(serviceAssemblyDesc.getIdentification().getName());
        ServiceAssemblyImpl sa = new ServiceAssemblyImpl(bundle, serviceAssemblyDesc, sus, prefs, endpointListener, autoStart);
        sa.setShutdownTimeout(shutdownTimeout);
        sa.setListenerRegistry(listenerRegistry);
        sa.init();
        serviceAssemblies.put(sa.getName(), sa);

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    }


    public abstract String getName();


    public void init() throws Exception {
        Preferences prefs = getPreferences();
        long lastInstall = prefs.getLong(LAST_INSTALL, 0);
        isFirstInstall = lastInstall == 0; 
        isModified = lastInstall == 0 || getBundle().getLastModified() > lastInstall;
        if (isModified && installRoot != null) {
            extractBundle(installRoot, getBundle(), "/");
            lastInstall = getBundle().getLastModified();
            prefs.put(AbstractLifecycleJbiArtifact.STATE, isAutoStart()
                            ? AbstractLifecycleJbiArtifact.State.Started.name()
                            : AbstractLifecycleJbiArtifact.State.Shutdown.name());
        }
    }

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                            : AbstractLifecycleJbiArtifact.State.Shutdown.name());
        }
    }


    protected void postInstall() throws Exception {
        Preferences prefs = getPreferences();
        prefs.putLong(LAST_INSTALL, getBundle().getLastModified());
        prefs.flush();
    }

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    protected Preferences getPreferences() {
        return deployer.getPreferencesService().getUserPreferences(getName());
    }


    protected void deletePreferences() throws BackingStoreException {
        Preferences prefs = getPreferences();
        prefs.clear();
        prefs.flush();
    }

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        // Few components actually use this, but Ode is one of them
        File installRoot = new File(System.getProperty("servicemix.base"), "data/jbi/" + name + "/install");
        installRoot.mkdirs();
        extractBundle(installRoot, bundle, "/");
        // Instanciate component
        Preferences prefs = preferencesService.getUserPreferences(name);
        Class clazz = classLoader.loadClass(componentDesc.getComponentClassName());
        javax.jbi.component.Component innerComponent = (javax.jbi.component.Component) clazz.newInstance();
        ComponentImpl component = new ComponentImpl(componentDesc, innerComponent, prefs, autoStart, this);
        components.put(name, component);
        // populate props from the component meta-data

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                }
            }
            return;
        }
        // Now create the SA and initialize it
        Preferences prefs = preferencesService.getUserPreferences(serviceAssembyDesc.getIdentification().getName());
        ServiceAssemblyImpl sa = new ServiceAssemblyImpl(serviceAssembyDesc, sus, prefs, autoStart);
        sa.init();
        serviceAssemblies.put(sa.getName(), sa);
        // populate props from the component meta-data
        Dictionary<String, String> props = new Hashtable<String, String>();

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    protected void maybeWrapComponent(ServiceReference reference, javax.jbi.component.Component component) {
        String name = (String) reference.getProperty(NAME);
        if (name != null && !components.containsKey(name)) {
            String type = (String) reference.getProperty(TYPE);
            Preferences prefs = preferencesService.getUserPreferences(name);
            ComponentDesc componentDesc = new ComponentDesc();
            componentDesc.setIdentification(new Identification());
            componentDesc.getIdentification().setName(name);
            componentDesc.setType(type);
            ComponentImpl wrapper = new ComponentImpl(componentDesc, component, prefs, autoStart, this);

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              return Status.OK_STATUS;
            try {
              // save the preferences nodes
              if (next.isAccessible()) {
                // save content type preferences
                Preferences projectPrefs = JSPFContentProperties.getPreferences(next, JSPFContentProperties.JSPCONTENTTYPE, false);
                if (projectPrefs != null)
                  projectPrefs.flush();
                // save language preferences
                projectPrefs = JSPFContentProperties.getPreferences(next, JSPFContentProperties.JSPLANGUAGE, false);
                if (projectPrefs != null)
                  projectPrefs.flush();


              }
            }
            catch (BackingStoreException e) {
              // we got an error saving

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     */
    private boolean processPreferences(IProject currentProject, String key, IResourceDelta projectDelta, Set projectsToSave) {
      boolean resourceChanges = false;


      // get the project-key preference node
      Preferences projectPrefs = JSPFContentProperties.getPreferences(currentProject, key, false);
      if (projectPrefs == null)
        // no preferences for this project-key, just bail
        return false;
      String[] affectedResources;
      try {
        affectedResources = projectPrefs.keys();
      }
      catch (BackingStoreException e) {
        // problems with the project scope... we gonna miss the
        // changes (but will log)
        Logger.log(Logger.WARNING_DEBUG, "Problem retreiving JSP Fragment preferences", e); //$NON-NLS-1$
        return false;
      }


      // go through each preference key (which is really a file name)
      for (int i = 0; i < affectedResources.length; i++) {
        // see if preference key/file name was file that was changed
        IResourceDelta memberDelta = projectDelta.findMember(new Path(affectedResources[i]));
        // no changes for the given resource
        if (memberDelta == null)
          continue;
        if (memberDelta.getKind() == IResourceDelta.REMOVED) {
          resourceChanges = true;
          // remove the setting for the original location
          String currentValue = projectPrefs.get(affectedResources[i], null);
          projectPrefs.remove(affectedResources[i]);
          if ((memberDelta.getFlags() & IResourceDelta.MOVED_TO) != 0) {
            // if moving, copy the setting for the new location
            IProject targetProject = ResourcesPlugin.getWorkspace().getRoot().getProject(memberDelta.getMovedToPath().segment(0));
            Preferences targetPrefs = JSPFContentProperties.getPreferences(targetProject, key, true);
            targetPrefs.put(JSPFContentProperties.getKeyFor(memberDelta.getMovedToPath()), currentValue);
            if (targetProject != currentProject)
              projectsToSave.add(targetProject);
          }
        }
      }

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