opendaylight/netconf/mdsal-netconf-connector/src/main/java/org/opendaylight/controller/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.controller.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.controller.netconf.api.xml.XmlNetconfConstants;
  22 import org.opendaylight.controller.netconf.mdsal.connector.CurrentSchemaContext;
  23 import org.opendaylight.controller.netconf.mdsal.connector.TransactionProvider;
  24 import org.opendaylight.controller.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, final TransactionProvider transactionProvider) {
  40         super(netconfSessionIdForReporting, schemaContext);
  41         this.transactionProvider = transactionProvider;
  42     }
  43
  44     @Override
  45     protected Element handleWithNoSubsequentOperations(Document document, XmlElement operationElement) throws DocumentedException {
  46
  47         final Optional<YangInstanceIdentifier> dataRootOptional = getDataRootFromFilter(operationElement);
  48         if (!dataRootOptional.isPresent()) {
  49             return XmlUtil.createElement(document, XmlNetconfConstants.DATA_KEY, Optional.<String>absent());
  50         }
  51
  52         final YangInstanceIdentifier dataRoot = dataRootOptional.get();
  53
  54         DOMDataReadWriteTransaction rwTx = getTransaction(Datastore.running);
  55         try {
  56             final Optional<NormalizedNode<?, ?>> normalizedNodeOptional = rwTx.read(LogicalDatastoreType.OPERATIONAL, dataRoot).checkedGet();
  57             transactionProvider.abortRunningTransaction(rwTx);
  58
  59             if (!normalizedNodeOptional.isPresent()) {
  60                 return XmlUtil.createElement(document, XmlNetconfConstants.DATA_KEY, Optional.<String>absent());
  61             }
  62
  63             return serializeNodeWithParentStructure(document, dataRoot, normalizedNodeOptional.get());
  64         } catch (ReadFailedException e) {
  65             LOG.warn("Unable to read data: {}", dataRoot, e);
  66             throw new IllegalStateException("Unable to read data " + dataRoot, e);
  67         }
  68     }
  69
  70     private DOMDataReadWriteTransaction getTransaction(Datastore datastore) throws DocumentedException{
  71         if (datastore == Datastore.candidate) {
  72             return transactionProvider.getOrCreateTransaction();
  73         } else if (datastore == Datastore.running) {
  74             return transactionProvider.createRunningTransaction();
  75         }
  76         throw new DocumentedException("Incorrect Datastore: ", ErrorType.protocol, ErrorTag.bad_element, ErrorSeverity.error);
  77     }
  78
  79     @Override
  80     protected String getOperationName() {
  81         return OPERATION_NAME;
  82     }
  83 }