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
   9 package org.opendaylight.netconf.mdsal.connector.ops.get;
  10
  11 import com.google.common.base.Optional;
  12 import org.opendaylight.controller.config.util.xml.DocumentedException;
  13 import org.opendaylight.controller.config.util.xml.DocumentedException.ErrorSeverity;
  14 import org.opendaylight.controller.config.util.xml.DocumentedException.ErrorTag;
  15 import org.opendaylight.controller.config.util.xml.DocumentedException.ErrorType;
  16 import org.opendaylight.controller.config.util.xml.XmlElement;
  17 import org.opendaylight.controller.config.util.xml.XmlUtil;
  18 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  19 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  20 import org.opendaylight.controller.md.sal.dom.api.DOMDataReadWriteTransaction;
  21 import org.opendaylight.netconf.api.xml.XmlNetconfConstants;
  22 import org.opendaylight.netconf.mdsal.connector.CurrentSchemaContext;
  23 import org.opendaylight.netconf.mdsal.connector.TransactionProvider;
  24 import org.opendaylight.netconf.mdsal.connector.ops.Datastore;
  25 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  26 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29 import org.w3c.dom.Document;
  30 import org.w3c.dom.Element;
  31
  32 public class Get extends AbstractGet {
  33
  34     private static final Logger LOG = LoggerFactory.getLogger(Get.class);
  35
  36     private static final String OPERATION_NAME = "get";
  37     private final TransactionProvider transactionProvider;
  38
  39     public Get(final String netconfSessionIdForReporting, final CurrentSchemaContext schemaContext,
  40                final TransactionProvider transactionProvider) {
  41         super(netconfSessionIdForReporting, schemaContext);
  42         this.transactionProvider = transactionProvider;
  43     }
  44
  45     @Override
  46     protected Element handleWithNoSubsequentOperations(final Document document, final XmlElement operationElement)
  47             throws DocumentedException {
  48
  49         final Optional<YangInstanceIdentifier> dataRootOptional = getDataRootFromFilter(operationElement);
  50         if (!dataRootOptional.isPresent()) {
  51             return XmlUtil.createElement(document, XmlNetconfConstants.DATA_KEY, Optional.<String>absent());
  52         }
  53
  54         final YangInstanceIdentifier dataRoot = dataRootOptional.get();
  55
  56         final DOMDataReadWriteTransaction rwTx = getTransaction(Datastore.running);
  57         try {
  58             final Optional<NormalizedNode<?, ?>> normalizedNodeOptional = rwTx.read(
  59                     LogicalDatastoreType.OPERATIONAL, dataRoot).checkedGet();
  60             transactionProvider.abortRunningTransaction(rwTx);
  61
  62             if (!normalizedNodeOptional.isPresent()) {
  63                 return XmlUtil.createElement(document, XmlNetconfConstants.DATA_KEY, Optional.<String>absent());
  64             }
  65
  66             return serializeNodeWithParentStructure(document, dataRoot, normalizedNodeOptional.get());
  67         } catch (final ReadFailedException e) {
  68             LOG.warn("Unable to read data: {}", dataRoot, e);
  69             throw new IllegalStateException("Unable to read data " + dataRoot, e);
  70         }
  71     }
  72
  73     private DOMDataReadWriteTransaction getTransaction(final Datastore datastore) throws DocumentedException {
  74         if (datastore == Datastore.candidate) {
  75             return transactionProvider.getOrCreateTransaction();
  76         } else if (datastore == Datastore.running) {
  77             return transactionProvider.createRunningTransaction();
  78         }
  79         throw new DocumentedException("Incorrect Datastore: ", ErrorType.PROTOCOL, ErrorTag.BAD_ELEMENT,
  80                 ErrorSeverity.ERROR);
  81     }
  82
  83     @Override
  84     protected String getOperationName() {
  85         return OPERATION_NAME;
  86     }
  87 }