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+/**
+ * $RCSfile: PEPProvider.java,v $
+ * $Revision: 1.2 $
+ * $Date: 2007/11/06 02:05:09 $
+ *
+ * Copyright 2003-2007 Jive Software.
+ *
+ * All rights reserved. Licensed 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.jivesoftware.smackx.provider;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.jivesoftware.smack.packet.PacketExtension;
+import org.jivesoftware.smack.provider.PacketExtensionProvider;
+import org.xmlpull.v1.XmlPullParser;
+
+/**
+ *
+ * The PEPProvider parses incoming PEPEvent packets.
+ * (XEP-163 has a weird asymmetric deal: outbound PEP are <iq> + <pubsub> and inbound are <message> + <event>.
+ * The provider only deals with inbound, and so it only deals with <message>.
+ *
+ * Anyhoo...
+ *
+ * The way this works is that PEPxxx classes are generic <pubsub> and <message> providers, and anyone who
+ * wants to publish/receive PEPs, such as <tune>, <geoloc>, etc., simply need to extend PEPItem and register (here)
+ * a PacketExtensionProvider that knows how to parse that PEPItem extension.
+ *
+ * @author Jeff Williams
+ */
+public class PEPProvider implements PacketExtensionProvider {
+
+ Map<String, PacketExtensionProvider> nodeParsers = new HashMap<String, PacketExtensionProvider>();
+ PacketExtension pepItem;
+
+ /**
+ * Creates a new PEPProvider.
+ * ProviderManager requires that every PacketExtensionProvider has a public, no-argument constructor
+ */
+ public PEPProvider() {
+ }
+
+ public void registerPEPParserExtension(String node, PacketExtensionProvider pepItemParser) {
+ nodeParsers.put(node, pepItemParser);
+ }
+
+ /**
+ * Parses a PEPEvent packet and extracts a PEPItem from it.
+ * (There is only one per <event>.)
+ *
+ * @param parser the XML parser, positioned at the starting element of the extension.
+ * @return a PacketExtension.
+ * @throws Exception if a parsing error occurs.
+ */
+ public PacketExtension parseExtension(XmlPullParser parser) throws Exception {
+
+ boolean done = false;
+ while (!done) {
+ int eventType = parser.next();
+ if (eventType == XmlPullParser.START_TAG) {
+ if (parser.getName().equals("event")) {
+ } else if (parser.getName().equals("items")) {
+ // Figure out the node for this event.
+ String node = parser.getAttributeValue("", "node");
+ // Get the parser for this kind of node, and if found then parse the node.
+ PacketExtensionProvider nodeParser = nodeParsers.get(node);
+ if (nodeParser != null) {
+ pepItem = nodeParser.parseExtension(parser);
+ }
+ }
+ } else if (eventType == XmlPullParser.END_TAG) {
+ if (parser.getName().equals("event")) {
+ done = true;
+ }
+ }
+ }
+
+ return pepItem;
+ }
+}