1/**
2 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
3 * you may not use this file except in compliance with the License.
4 * You may obtain a copy of the License at
5 *
6 *     http://www.apache.org/licenses/LICENSE-2.0
7 *
8 * Unless required by applicable law or agreed to in writing, software
9 * distributed under the License is distributed on an "AS IS" BASIS,
10 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 * See the License for the specific language governing permissions and
12 * limitations under the License.
13 */
14
15package org.jivesoftware.smackx.packet;
16
17import java.util.Collection;
18import java.util.Collections;
19
20import org.jivesoftware.smack.packet.PacketExtension;
21
22/**
23 * Extension representing a list of headers as specified in <a href="http://xmpp.org/extensions/xep-0131">Stanza Headers and Internet Metadata (SHIM)</a>
24 *
25 * @see Header
26 *
27 * @author Robin Collier
28 */
29public class HeadersExtension implements PacketExtension
30{
31	public static final String NAMESPACE = "http://jabber.org/protocol/shim";
32
33	private Collection<Header> headers = Collections.EMPTY_LIST;
34
35	public HeadersExtension(Collection<Header> headerList)
36	{
37		if (headerList != null)
38			headers = headerList;
39	}
40
41	public Collection<Header> getHeaders()
42	{
43		return headers;
44	}
45
46	public String getElementName()
47	{
48		return "headers";
49	}
50
51	public String getNamespace()
52	{
53		return NAMESPACE;
54	}
55
56	public String toXML()
57	{
58		StringBuilder builder = new StringBuilder("<" + getElementName() + " xmlns='" + getNamespace() + "'>");
59
60		for (Header header : headers)
61		{
62			builder.append(header.toXML());
63		}
64		builder.append("</" + getElementName() + '>');
65
66		return builder.toString();
67	}
68
69}
70