opendaylight/netconf/netconf-client/src/main/java/org/opendaylight/controller/netconf/client/NetconfClientSessionNegotiator.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   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
   7  */
   8
   9 package org.opendaylight.controller.netconf.client;
  10
  11 import com.google.common.base.Function;
  12 import com.google.common.collect.Collections2;
  13 import io.netty.channel.Channel;
  14 import io.netty.util.Timer;
  15 import io.netty.util.concurrent.Promise;
  16 import org.opendaylight.controller.netconf.api.NetconfSessionPreferences;
  17 import org.opendaylight.controller.netconf.util.AbstractNetconfSessionNegotiator;
  18 import org.opendaylight.controller.netconf.util.xml.XMLNetconfUtil;
  19 import org.opendaylight.controller.netconf.util.xml.XmlElement;
  20 import org.opendaylight.controller.netconf.util.xml.XmlNetconfConstants;
  21 import org.opendaylight.controller.netconf.util.xml.XmlUtil;
  22 import org.opendaylight.protocol.framework.SessionListener;
  23 import org.w3c.dom.Document;
  24 import org.w3c.dom.Node;
  25
  26 import javax.annotation.Nullable;
  27 import javax.xml.xpath.XPathConstants;
  28 import javax.xml.xpath.XPathExpression;
  29 import java.util.Collection;
  30 import java.util.List;
  31
  32 public class NetconfClientSessionNegotiator extends
  33         AbstractNetconfSessionNegotiator<NetconfSessionPreferences, NetconfClientSession> {
  34
  35     protected NetconfClientSessionNegotiator(NetconfSessionPreferences sessionPreferences,
  36             Promise<NetconfClientSession> promise, Channel channel, Timer timer, SessionListener sessionListener) {
  37         super(sessionPreferences, promise, channel, timer, sessionListener);
  38     }
  39
  40     private static Collection<String> getCapabilities(Document doc) {
  41         XmlElement responseElement = XmlElement.fromDomDocument(doc);
  42         XmlElement capabilitiesElement = responseElement
  43                 .getOnlyChildElementWithSameNamespace(XmlNetconfConstants.CAPABILITIES);
  44         List<XmlElement> caps = capabilitiesElement.getChildElements(XmlNetconfConstants.CAPABILITY);
  45         return Collections2.transform(caps, new Function<XmlElement, String>() {
  46
  47             @Nullable
  48             @Override
  49             public String apply(@Nullable XmlElement input) {
  50                 return input.getTextContent();
  51             }
  52         });
  53     }
  54
  55     private static final XPathExpression sessionIdXPath = XMLNetconfUtil
  56             .compileXPath("/netconf:hello/netconf:session-id");
  57
  58     private long extractSessionId(Document doc) {
  59         final Node sessionIdNode = (Node) XmlUtil.evaluateXPath(sessionIdXPath, doc, XPathConstants.NODE);
  60         String textContent = sessionIdNode.getTextContent();
  61         if (textContent == null || textContent.equals("")) {
  62             throw new IllegalStateException("Session id not received from server");
  63         }
  64
  65         return Long.valueOf(textContent);
  66     }
  67
  68     @Override
  69     protected NetconfClientSession getSession(SessionListener sessionListener, Channel channel, Document doc) {
  70         return new NetconfClientSession(sessionListener, channel, extractSessionId(doc), getCapabilities(doc));
  71     }
  72 }