netconf/mdsal-netconf-connector/src/main/java/org/opendaylight/netconf/mdsal/connector/ops/get/Get.java

   1 /*
   2  * Copyright (c) 2015 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 package org.opendaylight.netconf.mdsal.connector.ops.get;
   9
  10 import java.util.Optional;
  11 import java.util.concurrent.ExecutionException;
  12 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  13 import org.opendaylight.mdsal.dom.api.DOMDataTreeReadWriteTransaction;
  14 import org.opendaylight.netconf.api.DocumentedException;
  15 import org.opendaylight.netconf.api.DocumentedException.ErrorSeverity;
  16 import org.opendaylight.netconf.api.DocumentedException.ErrorTag;
  17 import org.opendaylight.netconf.api.DocumentedException.ErrorType;
  18 import org.opendaylight.netconf.api.xml.XmlElement;
  19 import org.opendaylight.netconf.api.xml.XmlNetconfConstants;
  20 import org.opendaylight.netconf.mdsal.connector.CurrentSchemaContext;
  21 import org.opendaylight.netconf.mdsal.connector.TransactionProvider;
  22 import org.opendaylight.netconf.mdsal.connector.ops.Datastore;
  23 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  24 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27 import org.w3c.dom.Document;
  28 import org.w3c.dom.Element;
  29
  30 public class Get extends AbstractGet {
  31
  32     private static final Logger LOG = LoggerFactory.getLogger(Get.class);
  33
  34     private static final String OPERATION_NAME = "get";
  35     private final TransactionProvider transactionProvider;
  36
  37     public Get(final String netconfSessionIdForReporting, final CurrentSchemaContext schemaContext,
  38                final TransactionProvider transactionProvider) {
  39         super(netconfSessionIdForReporting, schemaContext);
  40         this.transactionProvider = transactionProvider;
  41     }
  42
  43     @Override
  44     protected Element handleWithNoSubsequentOperations(final Document document, final XmlElement operationElement)
  45             throws DocumentedException {
  46
  47         final Optional<YangInstanceIdentifier> dataRootOptional = getDataRootFromFilter(operationElement);
  48         if (!dataRootOptional.isPresent()) {
  49             return document.createElement(XmlNetconfConstants.DATA_KEY);
  50         }
  51
  52         final YangInstanceIdentifier dataRoot = dataRootOptional.get();
  53
  54         final DOMDataTreeReadWriteTransaction rwTx = getTransaction(Datastore.running);
  55         try {
  56             final java.util.Optional<NormalizedNode<?, ?>> normalizedNodeOptional = rwTx.read(
  57                     LogicalDatastoreType.OPERATIONAL, dataRoot).get();
  58             transactionProvider.abortRunningTransaction(rwTx);
  59
  60             if (!normalizedNodeOptional.isPresent()) {
  61                 return document.createElement(XmlNetconfConstants.DATA_KEY);
  62             }
  63
  64             return serializeNodeWithParentStructure(document, dataRoot, normalizedNodeOptional.get());
  65         } catch (final InterruptedException | ExecutionException e) {
  66             LOG.warn("Unable to read data: {}", dataRoot, e);
  67             throw new IllegalStateException("Unable to read data " + dataRoot, e);
  68         }
  69     }
  70
  71     private DOMDataTreeReadWriteTransaction getTransaction(final Datastore datastore) throws DocumentedException {
  72         if (datastore == Datastore.candidate) {
  73             return transactionProvider.getOrCreateTransaction();
  74         } else if (datastore == Datastore.running) {
  75             return transactionProvider.createRunningTransaction();
  76         }
  77         throw new DocumentedException("Incorrect Datastore: ", ErrorType.PROTOCOL, ErrorTag.BAD_ELEMENT,
  78                 ErrorSeverity.ERROR);
  79     }
  80
  81     @Override
  82     protected String getOperationName() {
  83         return OPERATION_NAME;
  84     }
  85 }