001/**
002 *
003 * Copyright the original author or authors
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smackx.pubsub;
018
019import java.util.Collections;
020import java.util.List;
021
022/**
023 * Represents the element holding the list of subscription elements.
024 * 
025 * @author Robin Collier
026 */
027public class SubscriptionsExtension extends NodeExtension
028{
029        protected List<Subscription> items = Collections.emptyList();
030        
031        /**
032         * Subscriptions to the root node
033         * 
034         * @param subList The list of subscriptions
035         */
036        public SubscriptionsExtension(List<Subscription> subList)
037        {
038                super(PubSubElementType.SUBSCRIPTIONS);
039                
040                if (subList != null)
041                        items = subList;
042        }
043
044        /**
045         * Subscriptions to the specified node.
046         * 
047         * @param nodeId The node subscribed to
048         * @param subList The list of subscriptions
049         */
050        public SubscriptionsExtension(String nodeId, List<Subscription> subList)
051        {
052                super(PubSubElementType.SUBSCRIPTIONS, nodeId);
053
054                if (subList != null)
055                        items = subList;
056        }
057
058        /**
059         * Gets the list of subscriptions.
060         * 
061         * @return List of subscriptions
062         */
063        public List<Subscription> getSubscriptions()
064        {
065                return items;
066        }
067
068        @Override
069        public CharSequence toXML()
070        {
071                if ((items == null) || (items.size() == 0))
072                {
073                        return super.toXML();
074                }
075                else
076                {
077                        StringBuilder builder = new StringBuilder("<");
078                        builder.append(getElementName());
079                        
080                        if (getNode() != null)
081                        {
082                                builder.append(" node='");
083                                builder.append(getNode());
084                                builder.append("'");
085                        }
086                        builder.append(">");
087                        
088                        for (Subscription item : items)
089                        {
090                                builder.append(item.toXML());
091                        }
092                        
093                        builder.append("</");
094                        builder.append(getElementName());
095                        builder.append(">");
096                        return builder.toString();
097                }
098        }
099}