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.api.xml.XmlUtil;
  21 import org.opendaylight.netconf.mdsal.connector.CurrentSchemaContext;
  22 import org.opendaylight.netconf.mdsal.connector.TransactionProvider;
  23 import org.opendaylight.netconf.mdsal.connector.ops.Datastore;
  24 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  25 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  26 import org.slf4j.Logger;
  27 import org.slf4j.LoggerFactory;
  28 import org.w3c.dom.Document;
  29 import org.w3c.dom.Element;
  30
  31 public class Get extends AbstractGet {
  32
  33     private static final Logger LOG = LoggerFactory.getLogger(Get.class);
  34
  35     private static final String OPERATION_NAME = "get";
  36     private final TransactionProvider transactionProvider;
  37
  38     public Get(final String netconfSessionIdForReporting, final CurrentSchemaContext schemaContext,
  39                final TransactionProvider transactionProvider) {
  40         super(netconfSessionIdForReporting, schemaContext);
  41         this.transactionProvider = transactionProvider;
  42     }
  43
  44     @Override
  45     protected Element handleWithNoSubsequentOperations(final Document document, final XmlElement operationElement)
  46             throws DocumentedException {
  47
  48         final Optional<YangInstanceIdentifier> dataRootOptional = getDataRootFromFilter(operationElement);
  49         if (!dataRootOptional.isPresent()) {
  50             return XmlUtil.createElement(document, XmlNetconfConstants.DATA_KEY);
  51         }
  52
  53         final YangInstanceIdentifier dataRoot = dataRootOptional.get();
  54
  55         final DOMDataTreeReadWriteTransaction rwTx = getTransaction(Datastore.running);
  56         try {
  57             final java.util.Optional<NormalizedNode<?, ?>> normalizedNodeOptional = rwTx.read(
  58                     LogicalDatastoreType.OPERATIONAL, dataRoot).get();
  59             transactionProvider.abortRunningTransaction(rwTx);
  60
  61             if (!normalizedNodeOptional.isPresent()) {
  62                 return XmlUtil.createElement(document, XmlNetconfConstants.DATA_KEY);
  63             }
  64
  65             return serializeNodeWithParentStructure(document, dataRoot, normalizedNodeOptional.get());
  66         } catch (final InterruptedException | ExecutionException e) {
  67             LOG.warn("Unable to read data: {}", dataRoot, e);
  68             throw new IllegalStateException("Unable to read data " + dataRoot, e);
  69         }
  70     }
  71
  72     private DOMDataTreeReadWriteTransaction getTransaction(final Datastore datastore) throws DocumentedException {
  73         if (datastore == Datastore.candidate) {
  74             return transactionProvider.getOrCreateTransaction();
  75         } else if (datastore == Datastore.running) {
  76             return transactionProvider.createRunningTransaction();
  77         }
  78         throw new DocumentedException("Incorrect Datastore: ", ErrorType.PROTOCOL, ErrorTag.BAD_ELEMENT,
  79                 ErrorSeverity.ERROR);
  80     }
  81
  82     @Override
  83     protected String getOperationName() {
  84         return OPERATION_NAME;
  85     }
  86 }