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