/**
 * 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.pubsub;

import java.util.Collections;
import java.util.List;

/**
 * Represents the element holding the list of subscription elements.
 * 
 * @author Robin Collier
 */
public class SubscriptionsExtension extends NodeExtension
{
	protected List<Subscription> items = Collections.EMPTY_LIST;
	
	/**
	 * Subscriptions to the root node
	 * 
	 * @param subList The list of subscriptions
	 */
	public SubscriptionsExtension(List<Subscription> subList)
	{
		super(PubSubElementType.SUBSCRIPTIONS);
		
		if (subList != null)
			items = subList;
	}

	/**
	 * Subscriptions to the specified node.
	 * 
	 * @param nodeId The node subscribed to
	 * @param subList The list of subscriptions
	 */
	public SubscriptionsExtension(String nodeId, List<Subscription> subList)
	{
		super(PubSubElementType.SUBSCRIPTIONS, nodeId);

		if (subList != null)
			items = subList;
	}

	/**
	 * Gets the list of subscriptions.
	 * 
	 * @return List of subscriptions
	 */
	public List<Subscription> getSubscriptions()
	{
		return items;
	}

	@Override
	public String toXML()
	{
		if ((items == null) || (items.size() == 0))
		{
			return super.toXML();
		}
		else
		{
			StringBuilder builder = new StringBuilder("<");
			builder.append(getElementName());
			
			if (getNode() != null)
			{
				builder.append(" node='");
				builder.append(getNode());
				builder.append("'");
			}
			builder.append(">");
			
			for (Subscription item : items)
			{
				builder.append(item.toXML());
			}
			
			builder.append("</");
			builder.append(getElementName());
			builder.append(">");
			return builder.toString();
		}
	}
}