/**
 *
 * Copyright the original author or authors
 *
 * 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.emptyList();

    /**
     * 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 CharSequence 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();
        }
    }
}
