2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
9 package org.opendaylight.netconf.api.messages;
11 import com.google.common.base.Optional;
12 import com.google.common.collect.Sets;
14 import org.opendaylight.netconf.api.NetconfMessage;
15 import org.opendaylight.netconf.api.xml.XmlElement;
16 import org.opendaylight.netconf.api.xml.XmlNetconfConstants;
17 import org.opendaylight.netconf.api.xml.XmlUtil;
18 import org.opendaylight.yangtools.util.xml.UntrustedXML;
19 import org.w3c.dom.Document;
20 import org.w3c.dom.Element;
23 * NetconfMessage that can carry additional header with session metadata.
25 * @see NetconfHelloMessageAdditionalHeader
27 public final class NetconfHelloMessage extends NetconfMessage {
29 public static final String HELLO_TAG = "hello";
31 private final NetconfHelloMessageAdditionalHeader additionalHeader;
33 public NetconfHelloMessage(final Document doc, final NetconfHelloMessageAdditionalHeader additionalHeader) {
35 checkHelloMessage(doc);
36 this.additionalHeader = additionalHeader;
39 public NetconfHelloMessage(final Document doc) {
43 public Optional<NetconfHelloMessageAdditionalHeader> getAdditionalHeader() {
44 return Optional.fromNullable(additionalHeader);
47 private static void checkHelloMessage(final Document doc) {
48 if (!isHelloMessage(doc)) {
49 throw new IllegalArgumentException(String.format(
50 "Hello message invalid format, should contain %s tag from namespace %s, but is: %s", HELLO_TAG,
51 XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_NETCONF_BASE_1_0, XmlUtil.toString(doc)));
55 public static NetconfHelloMessage createClientHello(final Iterable<String> capabilities,
56 final Optional<NetconfHelloMessageAdditionalHeader> additionalHeaderOptional) {
57 return new NetconfHelloMessage(createHelloMessageDoc(capabilities), additionalHeaderOptional.orNull());
60 private static Document createHelloMessageDoc(final Iterable<String> capabilities) {
61 Document doc = UntrustedXML.newDocumentBuilder().newDocument();
62 Element helloElement = doc.createElementNS(XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_NETCONF_BASE_1_0,
64 Element capabilitiesElement = doc.createElementNS(XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_NETCONF_BASE_1_0,
65 XmlNetconfConstants.CAPABILITIES);
67 for (String capability : Sets.newHashSet(capabilities)) {
68 Element capElement = doc.createElementNS(XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_NETCONF_BASE_1_0,
69 XmlNetconfConstants.CAPABILITY);
70 capElement.setTextContent(capability);
71 capabilitiesElement.appendChild(capElement);
74 helloElement.appendChild(capabilitiesElement);
76 doc.appendChild(helloElement);
80 public static NetconfHelloMessage createServerHello(final Set<String> capabilities, final long sessionId) {
81 Document doc = createHelloMessageDoc(capabilities);
82 Element sessionIdElement = doc.createElementNS(XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_NETCONF_BASE_1_0,
83 XmlNetconfConstants.SESSION_ID);
84 sessionIdElement.setTextContent(Long.toString(sessionId));
85 doc.getDocumentElement().appendChild(sessionIdElement);
86 return new NetconfHelloMessage(doc);
89 public static boolean isHelloMessage(final NetconfMessage msg) {
90 return isHelloMessage(msg.getDocument());
93 private static boolean isHelloMessage(final Document document) {
94 final XmlElement element = XmlElement.fromDomElement(document.getDocumentElement());
95 if (!HELLO_TAG.equals(element.getName())) {
99 final Optional<String> optNamespace = element.getNamespaceOptionally();
100 // accept even if hello has no namespace
101 return !optNamespace.isPresent()
102 || XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_NETCONF_BASE_1_0.equals(optNamespace.get());