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.xml.XmlElement;
  16 import org.opendaylight.netconf.api.xml.XmlNetconfConstants;
  17 import org.opendaylight.netconf.mdsal.connector.CurrentSchemaContext;
  18 import org.opendaylight.netconf.mdsal.connector.TransactionProvider;
  19 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  20 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  21 import org.slf4j.Logger;
  22 import org.slf4j.LoggerFactory;
  23 import org.w3c.dom.Document;
  24 import org.w3c.dom.Element;
  25
  26 public class Get extends AbstractGet {
  27     private static final Logger LOG = LoggerFactory.getLogger(Get.class);
  28     private static final String OPERATION_NAME = "get";
  29
  30     private final TransactionProvider transactionProvider;
  31
  32     public Get(final String netconfSessionIdForReporting, final CurrentSchemaContext schemaContext,
  33             final TransactionProvider transactionProvider) {
  34         super(netconfSessionIdForReporting, schemaContext);
  35         this.transactionProvider = transactionProvider;
  36     }
  37
  38     @Override
  39     protected Element handleWithNoSubsequentOperations(final Document document, final XmlElement operationElement)
  40             throws DocumentedException {
  41
  42         final Optional<YangInstanceIdentifier> dataRootOptional = getDataRootFromFilter(operationElement);
  43         if (dataRootOptional.isEmpty()) {
  44             return document.createElement(XmlNetconfConstants.DATA_KEY);
  45         }
  46
  47         final YangInstanceIdentifier dataRoot = dataRootOptional.orElseThrow();
  48
  49         final DOMDataTreeReadWriteTransaction rwTx = transactionProvider.createRunningTransaction();
  50         try {
  51             final Optional<NormalizedNode> normalizedNodeOptional = rwTx.read(
  52                     LogicalDatastoreType.OPERATIONAL, dataRoot).get();
  53             transactionProvider.abortRunningTransaction(rwTx);
  54
  55             if (normalizedNodeOptional.isEmpty()) {
  56                 return document.createElement(XmlNetconfConstants.DATA_KEY);
  57             }
  58
  59             return serializeNodeWithParentStructure(document, dataRoot, normalizedNodeOptional.orElseThrow());
  60         } catch (final InterruptedException | ExecutionException e) {
  61             LOG.warn("Unable to read data: {}", dataRoot, e);
  62             throw new IllegalStateException("Unable to read data " + dataRoot, e);
  63         }
  64     }
  65
  66     @Override
  67     protected String getOperationName() {
  68         return OPERATION_NAME;
  69     }
  70 }