org.jivesoftware.smackx.packet.DefaultPrivateData Maven / Gradle / Ivy

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Smack is an Open Source XMPP (Jabber) client library for instant messaging and presence. This library provides the client side functionality as specified in the core XMPP specifications as related to the client side of said specifications.
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/**
 * $RCSfile$
 * $Revision: 7071 $
 * $Date: 2007-02-11 18:59:05 -0600 (Sun, 11 Feb 2007) $
 *
 * 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.packet;

import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * Default implementation of the PrivateData interface. Unless a PrivateDataProvider
 * is registered with the PrivateDataManager class, instances of this class will be
 * returned when getting private data.
 *
 * 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:
 *
 * 
 * <foo xmlns="http://bar.com">
 *     <color>blue</color>
 *     <food>pizza</food>
 * </foo>
 *
 * 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 {@link org.jivesoftware.smackx.provider.PrivateDataProvider} should be used.
 *
 * @author Matt Tucker
 */
public class DefaultPrivateData implements PrivateData {

    private String elementName;
    private String namespace;
    private Map map;

    /**
     * Creates a new generic private data object.
     *
     * @param elementName the name of the element of the XML sub-document.
     * @param namespace the namespace of the element.
     */
    public DefaultPrivateData(String elementName, String namespace) {
        this.elementName = elementName;
        this.namespace = namespace;
    }

     /**
     * Returns the XML element name of the private data sub-packet root element.
     *
     * @return the XML element name of the packet extension.
     */
    public String getElementName() {
        return elementName;
    }

    /**
     * Returns the XML namespace of the private data 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 (Iterator i=getNames(); i.hasNext(); ) {
            String name = (String)i.next();
            String value = getValue(name);
            buf.append("<").append(name).append(">");
            buf.append(value);
            buf.append("");
        }
        buf.append("");
        return buf.toString();
    }

    /**
     * Returns an Iterator for the names that can be used to get
     * values of the private data.
     *
     * @return an Iterator for the names.
     */
    public synchronized Iterator getNames() {
        if (map == null) {
            return Collections.EMPTY_LIST.iterator();
        }
        return Collections.unmodifiableMap(new HashMap(map)).keySet().iterator();
    }

    /**
     * Returns a 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 value given the 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);
    }
}