/*
* 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);
}
}