/**
 *
 * Copyright 2013-2014 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.receipts;

import java.util.List;
import java.util.Map;

import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.provider.EmbeddedExtensionProvider;

/**
 * Represents a <b>message delivery receipt</b> entry as specified by
 * <a href="http://xmpp.org/extensions/xep-0184.html">Message Delivery Receipts</a>.
 *
 * @author Georg Lukas
 */
public class DeliveryReceipt implements PacketExtension
{
    public static final String NAMESPACE = "urn:xmpp:receipts";
    public static final String ELEMENT = "received";

    private String id; /// original ID of the delivered message

    public DeliveryReceipt(String id)
    {
        this.id = id;
    }

    public String getId()
    {
        return id;
    }

    @Override
    public String getElementName()
    {
        return ELEMENT;
    }

    @Override
    public String getNamespace()
    {
        return NAMESPACE;
    }

    @Override
    public String toXML()
    {
        return "<received xmlns='" + NAMESPACE + "' id='" + id + "'/>";
    }

    /**
     * Get the {@link DeliveryReceipt} extension of the packet, if any.
     *
     * @param p the packet
     * @return the {@link DeliveryReceipt} extension or {@code null}
     */
    public static DeliveryReceipt getFrom(Packet p) {
        return p.getExtension(ELEMENT, NAMESPACE);
    }

    /**
     * This Provider parses and returns DeliveryReceipt packets.
     */
    public static class Provider extends EmbeddedExtensionProvider
    {

        @Override
        protected PacketExtension createReturnExtension(String currentElement, String currentNamespace,
                Map<String, String> attributeMap, List<? extends PacketExtension> content)
        {
            return new DeliveryReceipt(attributeMap.get("id"));
        }

    }
}