opendaylight/netconf/config-netconf-connector/src/main/java/org/opendaylight/controller/netconf/confignetconfconnector/operations/DiscardChanges.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.confignetconfconnector.operations;
  10
  11 import com.google.common.base.Optional;
  12
  13 import org.opendaylight.controller.config.util.ConfigRegistryClient;
  14 import org.opendaylight.controller.netconf.api.NetconfDocumentedException;
  15 import org.opendaylight.controller.netconf.api.NetconfDocumentedException.ErrorSeverity;
  16 import org.opendaylight.controller.netconf.api.NetconfDocumentedException.ErrorTag;
  17 import org.opendaylight.controller.netconf.api.NetconfDocumentedException.ErrorType;
  18 import org.opendaylight.controller.netconf.api.xml.XmlNetconfConstants;
  19 import org.opendaylight.controller.netconf.confignetconfconnector.transactions.TransactionProvider;
  20 import org.opendaylight.controller.netconf.util.xml.XmlElement;
  21 import org.opendaylight.controller.netconf.util.xml.XmlUtil;
  22 import org.slf4j.Logger;
  23 import org.slf4j.LoggerFactory;
  24 import org.w3c.dom.Document;
  25 import org.w3c.dom.Element;
  26
  27 import java.util.HashMap;
  28 import java.util.Map;
  29
  30
  31 public class DiscardChanges extends AbstractConfigNetconfOperation {
  32
  33     public static final String DISCARD = "discard-changes";
  34
  35     private static final Logger logger = LoggerFactory.getLogger(DiscardChanges.class);
  36
  37     private final TransactionProvider transactionProvider;
  38
  39     public DiscardChanges(final TransactionProvider transactionProvider, ConfigRegistryClient configRegistryClient,
  40             String netconfSessionIdForReporting) {
  41         super(configRegistryClient, netconfSessionIdForReporting);
  42         this.transactionProvider = transactionProvider;
  43     }
  44
  45     private static void fromXml(XmlElement xml) throws NetconfDocumentedException {
  46         xml.checkName(DISCARD);
  47         xml.checkNamespace(XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_NETCONF_BASE_1_0);
  48     }
  49
  50     @Override
  51     protected String getOperationName() {
  52         return DISCARD;
  53     }
  54
  55     @Override
  56     protected Element handleWithNoSubsequentOperations(Document document, XmlElement xml) throws NetconfDocumentedException {
  57         fromXml(xml);
  58         try {
  59             this.transactionProvider.abortTransaction();
  60         } catch (final IllegalStateException e) {
  61             logger.warn("Abort failed: ", e);
  62             final Map<String, String> errorInfo = new HashMap<>();
  63             errorInfo
  64                     .put(ErrorTag.operation_failed.name(),
  65                             "Operation failed. Use 'get-config' or 'edit-config' before triggering 'discard-changes' operation");
  66             throw new NetconfDocumentedException(e.getMessage(), e, ErrorType.application, ErrorTag.operation_failed,
  67                     ErrorSeverity.error, errorInfo);
  68         }
  69         logger.trace("Changes discarded successfully from datastore {}", Datastore.candidate);
  70
  71
  72         return XmlUtil.createElement(document, XmlNetconfConstants.OK, Optional.<String>absent());
  73     }
  74 }