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Change-Id: I49ce97136c17173c4ae3965c694af6e7bc49897d

1 files changed, 133 insertions, 0 deletions

diff --git a/src/org/jivesoftware/smack/packet/DefaultPacketExtension.java b/src/org/jivesoftware/smack/packet/DefaultPacketExtension.java
new file mode 100644
index 0000000..6cc7934
--- /dev/null
+++ b/src/org/jivesoftware/smack/packet/DefaultPacketExtension.java
@@ -0,0 +1,133 @@
+/**
+ * $RCSfile$
+ * $Revision$
+ * $Date$
+ *
+ * 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.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<String,String> 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() {
+        StringBuilder buf = new StringBuilder();
+        buf.append("<").append(elementName).append(" xmlns=\"").append(namespace).append("\">");
+        for (String name : getNames()) {
+            String value = getValue(name);
+            buf.append("<").append(name).append(">");
+            buf.append(value);
+            buf.append("</").append(name).append(">");
+        }
+        buf.append("</").append(elementName).append(">");
+        return buf.toString();
+    }
+
+    /**
+     * Returns an unmodifiable collection of the names that can be used to get
+     * values of the packet extension.
+     *
+     * @return the names.
+     */
+    public synchronized Collection<String> getNames() {
+        if (map == null) {
+            return Collections.emptySet();
+        }
+        return Collections.unmodifiableSet(new HashMap<String,String>(map).keySet());
+    }
+
+    /**
+     * 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 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<String,String>();
+        }
+        map.put(name, value);
+    }
+}
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