Initial check-in.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@1924 b35dd754-fafc-0310-a699-88a17e54d16e

source/org/jivesoftware/smack/packet/DefaultPacketExtension.java

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+/**
+ * $RCSfile$
+ * $Revision$
+ * $Date$
+ *
+ * Copyright (C) 2002-2003 Jive Software. All rights reserved.
+ * ====================================================================
+ * The Jive Software License (based on Apache Software License, Version 1.1)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution,
+ *    if any, must include the following acknowledgment:
+ *       "This product includes software developed by
+ *        Jive Software (http://www.jivesoftware.com)."
+ *    Alternately, this acknowledgment may appear in the software itself,
+ *    if and wherever such third-party acknowledgments normally appear.
+ *
+ * 4. The names "Smack" and "Jive Software" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please
+ *    contact webmaster@jivesoftware.com.
+ *
+ * 5. Products derived from this software may not be called "Smack",
+ *    nor may "Smack" appear in their name, without prior written
+ *    permission of Jive Software.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL JIVE SOFTWARE OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ */
+
+package org.jivesoftware.smack.packet;
+
+import java.util.*;
+
+/**
+ * Default implementation of the PacketExtension interface. Unless a PacketExtensionProvider
+ * is registered with {@link org.jivesoftware.smack.provider.ProviderManager ProviderManager},
+ * instances of this class will be returned when getting packet extensions.<p>
+ *
+ * This class provides a very simple representation of an XML sub-document. Each element
+ * is a key in a Map with its CDATA being the value. For example, given the following
+ * XML sub-document:
+ *
+ * <pre>
+ * &lt;foo xmlns="http://bar.com"&gt;
+ *     &lt;color&gt;blue&lt;/color&gt;
+ *     &lt;food&gt;pizza&lt;/food&gt;
+ * &lt;/foo&gt;</pre>
+ *
+ * In this case, getValue("color") would return "blue", and getValue("food") would
+ * return "pizza". This parsing mechanism mechanism is very simplistic and will not work
+ * as desired in all cases (for example, if some of the elements have attributes. In those
+ * cases, a custom PacketExtensionProvider should be used.
+ *
+ * @author Matt Tucker
+ */
+public class DefaultPacketExtension implements PacketExtension {
+
+    private String elementName;
+    private String namespace;
+    private Map map;
+
+    /**
+     * Creates a new generic packet extension.
+     *
+     * @param elementName the name of the element of the XML sub-document.
+     * @param namespace the namespace of the element.
+     */
+    public DefaultPacketExtension(String elementName, String namespace) {
+        this.elementName = elementName;
+        this.namespace = namespace;
+    }
+
+     /**
+     * Returns the XML element name of the extension sub-packet root element.
+     *
+     * @return the XML element name of the packet extension.
+     */
+    public String getElementName() {
+        return elementName;
+    }
+
+    /**
+     * Returns the XML namespace of the extension sub-packet root element.
+     *
+     * @return the XML namespace of the packet extension.
+     */
+    public String getNamespace() {
+        return namespace;
+    }
+
+    public String toXML() {
+        return null;
+    }
+
+    /**
+     * Returns an Iterator for the names that can be used to get
+     * values of the packet extension.
+     *
+     * @return an Iterator for the names.
+     */
+    public synchronized Iterator getNames() {
+        if (map == null) {
+            Collections.EMPTY_LIST.iterator();
+        }
+        return Collections.unmodifiableMap(new HashMap(map)).keySet().iterator();
+    }
+
+    /**
+     * Returns a packet extension value given a name.
+     *
+     * @param name the name.
+     * @return the value.
+     */
+    public synchronized String getValue(String name) {
+        if (map == null) {
+            return null;
+        }
+        return (String)map.get(name);
+    }
+
+    /**
+     * Sets a packet extension value using the given name.
+     *
+     * @param name the name.
+     * @param value the value.
+     */
+    public synchronized void setValue(String name, String value) {
+        if (map == null) {
+            map = new HashMap();
+        }
+        map.put(name, value);
+    }
+}