Examples of org.apache.felix.prefs.PreferencesImpl

org.apache.felix.prefs.PreferencesImpl
This is an implementation of the preferences. The access to the preferences is synchronized on the instance by making (nearly) all public methods synchronized. This avoids the heavy management of a separate read/write lock. Such a lock is too heavy for the simple operations preferences support. The various getXX and putXX methods are not synchronized as they all use the get/put methods which are synchronized.

    throws RepositoryException {
        this.readPreferences(prefs, session, node);
        final NodeIterator iterator = node.getNodes();
        while ( iterator.hasNext() ) {
            final Node current = iterator.nextNode();
            final PreferencesImpl impl = (PreferencesImpl)prefs.node(current.getName());
            this.readTree(impl, session, current);
        }
    }

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    public PreferencesImpl load(BackingStoreManager manager, PreferencesDescription desc) throws BackingStoreException {
        final Session session = this.checkInitialized();
        try {
            final String path = this.getNodePath(desc);
            if ( session.itemExists(path) ) {
                final PreferencesImpl root = new PreferencesImpl(desc, manager);
                this.readTree(root, session, (Node)session.getItem(path));


                return root;
            }
        } catch (RepositoryException re) {

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            // check for system preferences
            final PreferencesDescription systemDesc = new PreferencesDescription(bundleId, null);
            final String systemPath = this.getNodePath(systemDesc);
            if ( session.itemExists(systemPath) ) {
                final Node rootNode = (Node)session.getItem(systemPath);
                final PreferencesImpl root = new PreferencesImpl(systemDesc, manager);
                this.readTree(root, session, rootNode);
            }
            // user preferences
            final String userPath = this.rootNodePath + '/' + bundleId + '/' + "users";
            if ( session.itemExists(userPath) ) {
                final NodeIterator iterator = ((Node)session.getItem(userPath)).getNodes();
                while ( iterator.hasNext() ) {
                    final Node current = iterator.nextNode();
                    final PreferencesDescription desc = new PreferencesDescription(bundleId, current.getName());
                    final PreferencesImpl root = new PreferencesImpl(desc, manager);


                    this.readTree(root, session, current);


                    list.add(root);
                }

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    protected void store(PreferencesImpl prefs, Session session)
    throws BackingStoreException, RepositoryException {
        // do we need to store at all?
        if ( prefs.getChangeSet().hasChanges() ) {
            // load existing data
            final PreferencesImpl savedData = this.load(prefs.getBackingStoreManager(), prefs.getDescription());
            if ( savedData != null ) {
                // merge with saved version
                final PreferencesImpl n = savedData.getOrCreateNode(prefs.absolutePath());
                n.applyChanges(prefs);
                prefs = n;
            }
            this.writePreferences(prefs, session);
        }
        // now process children
        @SuppressWarnings("unchecked")
        final Iterator<PreferencesImpl> i = prefs.getChildren().iterator();
        while ( i.hasNext() ) {
            final PreferencesImpl p = i.next();
            this.store(p, session);
        }


    }

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    /**
     * @see org.apache.felix.prefs.BackingStore#update(org.apache.felix.prefs.PreferencesImpl)
     */
    public void update(PreferencesImpl prefs) throws BackingStoreException {
        final PreferencesImpl root = this.load(prefs.getBackingStoreManager(), prefs.getDescription());
        if ( root != null ) {
            // and now update
            if ( root.nodeExists(prefs.absolutePath()) ) {
                final PreferencesImpl updated = (PreferencesImpl)root.node(prefs.absolutePath());
                prefs.update(updated);
            }
        }
    }

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    /**
     * @see org.osgi.service.prefs.PreferencesService#getSystemPreferences()
     */
    public synchronized Preferences getSystemPreferences() {
        if ( this.systemTree == null ) {
            this.systemTree = new PreferencesImpl(new PreferencesDescription(this.bundleId, null), this.storeManager);
        }
        // sync with latest version from store
        try {
            this.systemTree.sync();
        } catch (BackingStoreException ignore) {

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    /**
     * @see org.osgi.service.prefs.PreferencesService#getUserPreferences(java.lang.String)
     */
    public synchronized Preferences getUserPreferences(String name) {
        PreferencesImpl result = (PreferencesImpl) this.trees.get(name);
        // if the tree does not exist yet, create it
        if (result == null || !result.isValid()) {
            result = new PreferencesImpl(new PreferencesDescription(this.bundleId, name), this.storeManager);
            this.trees.put(name, result);
        }
        // sync with latest version from store
        try {
            result.sync();
        } catch (BackingStoreException ignore) {
            // we ignore this
        }
        return result;
    }

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org.apache.felix.prefs.impl.PreferencesServiceImpl

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