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305 lines
No EOL
15 KiB
Java
305 lines
No EOL
15 KiB
Java
/**
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* $RCSfile$
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* $Revision$
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* $Date$
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*
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* Copyright (C) 2002-2003 Jive Software. All rights reserved.
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* ====================================================================
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* The Jive Software License (based on Apache Software License, Version 1.1)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by
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* Jive Software (http://www.jivesoftware.com)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Smack" and "Jive Software" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please
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* contact webmaster@jivesoftware.com.
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*
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* 5. Products derived from this software may not be called "Smack",
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* nor may "Smack" appear in their name, without prior written
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* permission of Jive Software.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL JIVE SOFTWARE OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*/
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package org.jivesoftware.smack.provider;
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import org.jivesoftware.smack.packet.IQ;
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import org.jivesoftware.smack.packet.PacketExtension;
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import org.xmlpull.v1.*;
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import java.util.*;
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import java.net.URL;
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/**
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* Manages providers for parsing custom XML sub-documents of XMPP packets. Two types of
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* providers exist:<ul>
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* <li>IQProvider -- parses IQ requests into Java objects.
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* <li>PacketExtension -- parses XML sub-documents attached to packets into
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* PacketExtension instances.</ul>
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*
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* <b>IQProvider</b><p>
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*
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* By default, Smack only knows how to process IQ packets with query sub-packets that
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* are in a few namespaces:<ul>
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* <li>jabber:iq:auth
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* <li>jabber:iq:roster
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* <li>jabber:iq:register</ul>
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*
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* Because many more IQ types are part of XMPP and its extensions, a pluggable IQ parsing
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* mechanism is provided. IQ providers are registered by creating a smack.providers file
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* in the WEB-INF directory of your JAR file. The file is an XML document that contains
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* one or more iqProvider entries, as in the following example:
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*
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* <pre>
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* <?xml version="1.0"?>
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* <smackProviders>
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* <iqProvider>
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* <elementName>query</elementName>
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* <namespace>jabber:iq:time</namespace>
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* <className>org.jivesoftware.smack.packet.Time</className>
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* </iqProvider>
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* </smackProviders></pre>
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*
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* Each IQ provider is associated with an element name and a namespace. If multiple provider entries attempt to
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* register to handle the same namespace, the first entry loaded from the classpath will
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* take precedence. The IQ provider class can either implement the IQProvider interface,
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* or extend the IQ class. In the former case, each IQProvider is responsible for parsing
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* the raw XML stream to create an IQ instance. In the latter case, bean introspection is
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* used to try to automatically set properties of the IQ instance using the values found
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* in the IQ packet XML. For example, an XMPP time packet resembles the following:
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* <pre>
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* <iq type='result' to='joe@example.com' from='mary@example.com' id='time_1'>
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* <query xmlns='jabber:iq:time'>
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* <utc>20020910T17:58:35</utc>
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* <tz>MDT</tz>
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* <display>Tue Sep 10 12:58:35 2002</display>
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* </query>
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* </iq></pre>
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*
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* In order for this packet to be automatically mapped to the Time object listed in the
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* providers file above, it must have the methods setUtc(String), setTz(String), and
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* setDisplay(String). The introspection service will automatically try to convert the String
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* value from the XML into a boolean, int, long, float, double, or Class depending on the
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* type the IQ instance expects.<p>
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*
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* A pluggable system for packet extensions, child elements in a custom namespace for
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* message and presence packets, also exists. Each extension provider
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* is registered with a name space in the smack.providers file as in the following example:
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*
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* <pre>
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* <?xml version="1.0"?>
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* <smackProviders>
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* <extensionProvider>
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* <elementName>x</elementName>
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* <namespace>jabber:iq:event</namespace>
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* <className>org.jivesoftware.smack.packet.MessageEvent</className>
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* </extensionProvider>
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* </smackProviders></pre>
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*
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* If multiple provider entries attempt to register to handle the same element name and namespace,
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* the first entry loaded from the classpath will take precedence. Whenever a packet extension
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* is found in a packet, parsing will be passed to the correct provider. Each provider
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* can either implement the PacketExtensionProvider interface or be a standard Java Bean. In
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* the former case, each extension provider is responsible for parsing the raw XML stream to
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* contruct an object. In the latter case, bean introspection is used to try to automatically
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* set the properties of the class using the values in the packet extension sub-element. When an
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* extension provider is not registered for an element name and namespace combination, Smack will
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* store all top-level elements of the sub-packet in DefaultPacketExtension object and then
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* attach it to the packet.
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*
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* @author Matt Tucker
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*/
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public class ProviderManager {
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private static Map extensionProviders = new Hashtable();
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private static Map iqProviders = new Hashtable();
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static {
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// Load IQ processing providers.
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try {
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Enumeration enum = ProviderManager.class.getClassLoader().getResources(
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"WEB-INF/smack.providers");
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while (enum.hasMoreElements()) {
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URL url = (URL)enum.nextElement();
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java.io.InputStream providerStream = null;
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try {
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providerStream = url.openStream();
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XmlPullParserFactory factory = XmlPullParserFactory.newInstance(
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"org.xmlpull.mxp1.MXParserFactory", null);
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factory.setNamespaceAware(true);
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XmlPullParser parser = factory.newPullParser();
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parser.setInput(providerStream, "UTF-8");
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int eventType = parser.getEventType();
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do {
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if (eventType == XmlPullParser.START_TAG) {
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if (parser.getName().equals("iqProvider")) {
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parser.next();
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parser.next();
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String elementName = parser.nextText();
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parser.next();
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parser.next();
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String namespace = parser.nextText();
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parser.next();
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parser.next();
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String className = parser.nextText();
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// Only add the provider for the namespace if one isn't
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// already registered.
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String key = getProviderKey(elementName, namespace);
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if (!iqProviders.containsKey(key)) {
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// Attempt to load the provider class and then create
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// a new instance if it's an IQProvider. Otherwise, if it's
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// an IQ class, add the class object itself, then we'll use
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// reflection later to create instances of the class.
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try {
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// Add the provider to the map.
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Class provider = Class.forName(className);
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if (IQProvider.class.isAssignableFrom(provider)) {
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iqProviders.put(key, provider.newInstance());
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}
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else if (IQ.class.isAssignableFrom(provider)) {
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iqProviders.put(key, provider);
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}
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}
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catch (ClassNotFoundException cnfe) {
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cnfe.printStackTrace();
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}
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}
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}
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else if (parser.getName().equals("extensionProvider")) {
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parser.next();
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parser.next();
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String elementName = parser.nextText();
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parser.next();
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parser.next();
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String namespace = parser.nextText();
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parser.next();
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parser.next();
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String className = parser.nextText();
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// Only add the provider for the namespace if one isn't
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// already registered.
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String key = getProviderKey(elementName, namespace);
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if (!extensionProviders.containsKey(key)) {
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// Attempt to load the provider class and then create
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// a new instance if it's a Provider. Otherwise, if it's
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// a PacketExtension, add the class object itself and
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// then we'll use reflection later to create instances
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// of the class.
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try {
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// Add the provider to the map.
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Class provider = Class.forName(className);
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if (PacketExtensionProvider.class.isAssignableFrom(provider)) {
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extensionProviders.put(key, provider.newInstance());
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}
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else if (PacketExtension.class.isAssignableFrom(provider)) {
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extensionProviders.put(key, provider);
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}
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}
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catch (ClassNotFoundException cnfe) {
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cnfe.printStackTrace();
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}
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}
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}
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}
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eventType = parser.next();
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} while (eventType != XmlPullParser.END_DOCUMENT);
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}
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finally {
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try { providerStream.close(); }
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catch (Exception e) { }
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}
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}
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}
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catch (Exception e) { }
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}
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/**
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* Returns the IQ provider registered to the specified XML element name and namespace.
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* For example, if a provider was registered to the element name "query" and the
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* namespace "jabber:iq:time", then the following packet would trigger the provider:
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*
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* <pre>
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* <iq type='result' to='joe@example.com' from='mary@example.com' id='time_1'>
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* <query xmlns='jabber:iq:time'>
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* <utc>20020910T17:58:35</utc>
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* <tz>MDT</tz>
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* <display>Tue Sep 10 12:58:35 2002</display>
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* </query>
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* </iq></pre>
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*
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* <p>Note: this method is generally only called by the internal Smack classes.
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*
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* @param elementName the XML element name.
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* @param namespace the XML namespace.
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* @return the IQ provider.
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*/
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public synchronized static Object getIQProvider(String elementName, String namespace) {
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String key = getProviderKey(elementName, namespace);
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return iqProviders.get(key);
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}
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/**
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* Returns the packet extension provider registered to the specified XML element name
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* and namespace. For example, if a provider was registered to the element name "x" and the
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* namespace "jabber:x:event", then the following packet would trigger the provider:
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*
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* <pre>
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* <message to='romeo@montague.net' id='message_1'>
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* <body>Art thou not Romeo, and a Montague?</body>
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* <x xmlns='jabber:x:event'>
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* <composing/>
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* </x>
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* </message></pre>
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*
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* <p>Note: this method is generally only called by the internal Smack classes.
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*
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* @param elementName
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* @param namespace
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* @return the extenion provider.
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*/
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public synchronized static Object getExtensionProvider(String elementName, String namespace) {
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String key = getProviderKey(elementName, namespace);
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return extensionProviders.get(key);
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}
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/**
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* Returns a String key for a given element name and namespace.
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*
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* @param elementName the element name.
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* @param namespace the namespace.
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* @return a unique key for the element name and namespace pair.
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*/
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private static String getProviderKey(String elementName, String namespace) {
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StringBuffer buf = new StringBuffer();
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buf.append("<").append(elementName).append("/><").append(namespace).append("/>");
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return buf.toString();
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}
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} |