/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. * */ package org.apache.vysper.xmpp.modules.extension.xep0060_pubsub.storageprovider; import java.util.HashMap; import java.util.Map; import org.apache.vysper.xmpp.modules.extension.xep0060_pubsub.NodeVisitor; import org.apache.vysper.xmpp.modules.extension.xep0060_pubsub.model.LeafNode; /** * This storage provider keeps all objects in memory and looses its content when * removed from memory. This is the default storage provider for collection nodes. * * @author The Apache MINA Project (http://mina.apache.org) */ public class CollectionNodeInMemoryStorageProvider implements CollectionNodeStorageProvider { // Map to store the nodes, access via JID protected Map<String, LeafNode> nodes; /** * Initialize the storage provider. */ public CollectionNodeInMemoryStorageProvider() { nodes = new HashMap<String, LeafNode>(); } /** * Search for a LeafNode via its name. */ public LeafNode findNode(String nodeName) { return nodes.get(nodeName); } /** * Check whether an LeafNode with the given node is already known. */ public boolean containsNode(String nodeName) { return nodes.containsKey(nodeName); } /** * Add the given LeafNode with the given JID to the storage. * An existing node with the same JID will be replaced. */ public void storeNode(LeafNode node) { nodes.put(node.getName(), node); } /** * Walk through all known nodes, calling visit on each. * * @param nv the visitor to be called. */ public void acceptNodes(NodeVisitor nv) { for (String node : nodes.keySet()) { nv.visit(nodes.get(node)); } } /** * The in-memory storage provider does not need initialization beyond creating the objects. */ public void initialize() { // empty } /** * Delete the node specified by nodeName. */ public void deleteNode(String nodeName) { LeafNode n = findNode(nodeName); n.delete(); this.nodes.remove(nodeName); } }