netconf/sal-netconf-connector/src/main/java/org/opendaylight/netconf/sal/connect/netconf/util/NetconfMessageTransformUtil.java

   1 /*
   2  * Copyright (c) 2014 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.sal.connect.netconf.util;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.collect.ImmutableList;
  13 import com.google.common.collect.ImmutableMap;
  14 import java.io.IOException;
  15 import java.net.URI;
  16 import java.time.format.DateTimeParseException;
  17 import java.util.AbstractMap;
  18 import java.util.Collection;
  19 import java.util.Collections;
  20 import java.util.Date;
  21 import java.util.List;
  22 import java.util.Map;
  23 import java.util.Map.Entry;
  24 import javax.xml.stream.XMLStreamException;
  25 import javax.xml.stream.XMLStreamWriter;
  26 import javax.xml.transform.dom.DOMResult;
  27 import javax.xml.transform.dom.DOMSource;
  28 import org.opendaylight.controller.config.util.xml.DocumentedException;
  29 import org.opendaylight.controller.config.util.xml.XmlElement;
  30 import org.opendaylight.controller.config.util.xml.XmlUtil;
  31 import org.opendaylight.netconf.api.NetconfDocumentedException;
  32 import org.opendaylight.netconf.api.NetconfMessage;
  33 import org.opendaylight.netconf.notifications.NetconfNotification;
  34 import org.opendaylight.netconf.sal.connect.util.MessageCounter;
  35 import org.opendaylight.netconf.util.NetconfUtil;
  36 import org.opendaylight.netconf.util.messages.NetconfMessageUtil;
  37 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.netconf.base._1._0.rev110601.edit.config.input.EditContent;
  38 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.netconf.notification._1._0.rev080714.CreateSubscriptionInput;
  39 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.netconf.monitoring.rev101004.NetconfState;
  40 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.netconf.notifications.rev120206.NetconfCapabilityChange;
  41 import org.opendaylight.yangtools.yang.common.QName;
  42 import org.opendaylight.yangtools.yang.common.RpcError;
  43 import org.opendaylight.yangtools.yang.common.RpcError.ErrorSeverity;
  44 import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
  45 import org.opendaylight.yangtools.yang.data.api.ModifyAction;
  46 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  47 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  48 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  49 import org.opendaylight.yangtools.yang.data.api.schema.AnyXmlNode;
  50 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  51 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  52 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  53 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  54 import org.opendaylight.yangtools.yang.data.impl.codec.xml.XMLStreamNormalizedNodeStreamWriter;
  55 import org.opendaylight.yangtools.yang.data.impl.schema.Builders;
  56 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  57 import org.opendaylight.yangtools.yang.data.impl.schema.SchemaOrderedNormalizedNodeWriter;
  58 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.NormalizedNodeAttrBuilder;
  59 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
  60 import org.opendaylight.yangtools.yang.model.api.NotificationDefinition;
  61 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  62 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  63 import org.slf4j.Logger;
  64 import org.slf4j.LoggerFactory;
  65 import org.w3c.dom.Document;
  66 import org.w3c.dom.Element;
  67
  68 public class NetconfMessageTransformUtil {
  69
  70     private static final Logger LOG = LoggerFactory.getLogger(NetconfMessageTransformUtil.class);
  71
  72     public static final String MESSAGE_ID_PREFIX = "m";
  73     public static final String MESSAGE_ID_ATTR = "message-id";
  74
  75     public static final QName CREATE_SUBSCRIPTION_RPC_QNAME = QName.create(CreateSubscriptionInput.QNAME, "create-subscription").intern();
  76     private static final String SUBTREE = "subtree";
  77
  78     // Blank document used for creation of new DOM nodes
  79     private static final Document BLANK_DOCUMENT = XmlUtil.newDocument();
  80     public static final String EVENT_TIME = "eventTime";
  81
  82     private NetconfMessageTransformUtil() {}
  83
  84     public static final QName IETF_NETCONF_MONITORING = QName.create(NetconfState.QNAME, "ietf-netconf-monitoring").intern();
  85     public static final QName GET_DATA_QNAME = QName.create(IETF_NETCONF_MONITORING, "data").intern();
  86     public static final QName GET_SCHEMA_QNAME = QName.create(IETF_NETCONF_MONITORING, "get-schema").intern();
  87     public static final QName IETF_NETCONF_MONITORING_SCHEMA_FORMAT = QName.create(IETF_NETCONF_MONITORING, "format").intern();
  88     public static final QName IETF_NETCONF_MONITORING_SCHEMA_LOCATION = QName.create(IETF_NETCONF_MONITORING, "location").intern();
  89     public static final QName IETF_NETCONF_MONITORING_SCHEMA_IDENTIFIER = QName.create(IETF_NETCONF_MONITORING, "identifier").intern();
  90     public static final QName IETF_NETCONF_MONITORING_SCHEMA_VERSION = QName.create(IETF_NETCONF_MONITORING, "version").intern();
  91     public static final QName IETF_NETCONF_MONITORING_SCHEMA_NAMESPACE = QName.create(IETF_NETCONF_MONITORING, "namespace").intern();
  92
  93     public static final QName IETF_NETCONF_NOTIFICATIONS = QName.create(NetconfCapabilityChange.QNAME, "ietf-netconf-notifications").intern();
  94
  95     public static final QName NETCONF_QNAME = QName.create("urn:ietf:params:xml:ns:netconf:base:1.0", "2011-06-01", "netconf").intern();
  96     public static final URI NETCONF_URI = NETCONF_QNAME.getNamespace();
  97
  98     public static final QName NETCONF_DATA_QNAME = QName.create(NETCONF_QNAME, "data").intern();
  99     public static final QName NETCONF_RPC_REPLY_QNAME = QName.create(NETCONF_QNAME, "rpc-reply").intern();
 100     public static final QName NETCONF_OK_QNAME = QName.create(NETCONF_QNAME, "ok").intern();
 101     public static final QName NETCONF_ERROR_OPTION_QNAME = QName.create(NETCONF_QNAME, "error-option").intern();
 102     public static final QName NETCONF_RUNNING_QNAME = QName.create(NETCONF_QNAME, "running").intern();
 103     public static final QName NETCONF_SOURCE_QNAME = QName.create(NETCONF_QNAME, "source").intern();
 104     public static final QName NETCONF_CANDIDATE_QNAME = QName.create(NETCONF_QNAME, "candidate").intern();
 105     public static final QName NETCONF_TARGET_QNAME = QName.create(NETCONF_QNAME, "target").intern();
 106     public static final QName NETCONF_CONFIG_QNAME = QName.create(NETCONF_QNAME, "config").intern();
 107     public static final QName NETCONF_COMMIT_QNAME = QName.create(NETCONF_QNAME, "commit").intern();
 108     public static final QName NETCONF_VALIDATE_QNAME = QName.create(NETCONF_QNAME, "validate").intern();
 109     public static final QName NETCONF_COPY_CONFIG_QNAME = QName.create(NETCONF_QNAME, "copy-config").intern();
 110     public static final QName NETCONF_OPERATION_QNAME = QName.create(NETCONF_QNAME, "operation").intern();
 111     public static final QName NETCONF_DEFAULT_OPERATION_QNAME = QName.create(NETCONF_OPERATION_QNAME, "default-operation").intern();
 112     public static final QName NETCONF_EDIT_CONFIG_QNAME = QName.create(NETCONF_QNAME, "edit-config").intern();
 113     public static final QName NETCONF_GET_CONFIG_QNAME = QName.create(NETCONF_QNAME, "get-config");
 114     public static final QName NETCONF_DISCARD_CHANGES_QNAME = QName.create(NETCONF_QNAME, "discard-changes");
 115     public static final QName NETCONF_TYPE_QNAME = QName.create(NETCONF_QNAME, "type").intern();
 116     public static final QName NETCONF_FILTER_QNAME = QName.create(NETCONF_QNAME, "filter").intern();
 117     public static final QName NETCONF_GET_QNAME = QName.create(NETCONF_QNAME, "get").intern();
 118     public static final QName NETCONF_RPC_QNAME = QName.create(NETCONF_QNAME, "rpc").intern();
 119
 120     public static final URI NETCONF_ROLLBACK_ON_ERROR_URI = URI
 121             .create("urn:ietf:params:netconf:capability:rollback-on-error:1.0");
 122     public static final String ROLLBACK_ON_ERROR_OPTION = "rollback-on-error";
 123
 124     public static final URI NETCONF_CANDIDATE_URI = URI
 125             .create("urn:ietf:params:netconf:capability:candidate:1.0");
 126
 127     public static final URI NETCONF_NOTIFICATONS_URI = URI
 128             .create("urn:ietf:params:netconf:capability:notification:1.0");
 129
 130     public static final URI NETCONF_RUNNING_WRITABLE_URI = URI
 131             .create("urn:ietf:params:netconf:capability:writable-running:1.0");
 132
 133     public static final QName NETCONF_LOCK_QNAME = QName.create(NETCONF_QNAME, "lock").intern();
 134     public static final QName NETCONF_UNLOCK_QNAME = QName.create(NETCONF_QNAME, "unlock").intern();
 135
 136     // Discard changes message
 137     public static final ContainerNode DISCARD_CHANGES_RPC_CONTENT =
 138             Builders.containerBuilder().withNodeIdentifier(new NodeIdentifier(NETCONF_DISCARD_CHANGES_QNAME)).build();
 139
 140     // Commit changes message
 141     public static final ContainerNode COMMIT_RPC_CONTENT =
 142             Builders.containerBuilder().withNodeIdentifier(new NodeIdentifier(NETCONF_COMMIT_QNAME)).build();
 143
 144     // Get message
 145     public static final ContainerNode GET_RPC_CONTENT =
 146             Builders.containerBuilder().withNodeIdentifier(new NodeIdentifier(NETCONF_GET_QNAME)).build();
 147
 148     // Create-subscription changes message
 149     public static final ContainerNode CREATE_SUBSCRIPTION_RPC_CONTENT =
 150             Builders.containerBuilder().withNodeIdentifier(new NodeIdentifier(CREATE_SUBSCRIPTION_RPC_QNAME)).build();
 151
 152     public static final DataContainerChild<?, ?> EMPTY_FILTER;
 153
 154     static {
 155         final NormalizedNodeAttrBuilder<NodeIdentifier, DOMSource, AnyXmlNode> anyXmlBuilder = Builders.anyXmlBuilder().withNodeIdentifier(toId(NETCONF_FILTER_QNAME));
 156         anyXmlBuilder.withAttributes(Collections.singletonMap(NETCONF_TYPE_QNAME, SUBTREE));
 157
 158         final Element element = XmlUtil.createElement(BLANK_DOCUMENT, NETCONF_FILTER_QNAME.getLocalName(), Optional.of(NETCONF_FILTER_QNAME.getNamespace().toString()));
 159         element.setAttributeNS(NETCONF_FILTER_QNAME.getNamespace().toString(), NETCONF_TYPE_QNAME.getLocalName(), "subtree");
 160
 161         anyXmlBuilder.withValue(new DOMSource(element));
 162
 163         EMPTY_FILTER = anyXmlBuilder.build();
 164     }
 165
 166     public static DataContainerChild<?, ?> toFilterStructure(final YangInstanceIdentifier identifier, final SchemaContext ctx) {
 167         final NormalizedNodeAttrBuilder<NodeIdentifier, DOMSource, AnyXmlNode> anyXmlBuilder = Builders.anyXmlBuilder().withNodeIdentifier(toId(NETCONF_FILTER_QNAME));
 168         anyXmlBuilder.withAttributes(Collections.singletonMap(NETCONF_TYPE_QNAME, SUBTREE));
 169
 170         final NormalizedNode<?, ?> filterContent = ImmutableNodes.fromInstanceId(ctx, identifier);
 171
 172         final Element element = XmlUtil.createElement(BLANK_DOCUMENT, NETCONF_FILTER_QNAME.getLocalName(), Optional.of(NETCONF_FILTER_QNAME.getNamespace().toString()));
 173         element.setAttributeNS(NETCONF_FILTER_QNAME.getNamespace().toString(), NETCONF_TYPE_QNAME.getLocalName(), "subtree");
 174
 175         try {
 176             NetconfUtil.writeNormalizedNode(filterContent, new DOMResult(element), SchemaPath.ROOT, ctx);
 177         } catch (IOException | XMLStreamException e) {
 178             throw new IllegalStateException("Unable to serialize filter element for path " + identifier, e);
 179         }
 180         anyXmlBuilder.withValue(new DOMSource(element));
 181
 182         return anyXmlBuilder.build();
 183     }
 184
 185     public static void checkValidReply(final NetconfMessage input, final NetconfMessage output)
 186             throws NetconfDocumentedException {
 187         final String inputMsgId = input.getDocument().getDocumentElement().getAttribute(MESSAGE_ID_ATTR);
 188         final String outputMsgId = output.getDocument().getDocumentElement().getAttribute(MESSAGE_ID_ATTR);
 189
 190         if(inputMsgId.equals(outputMsgId) == false) {
 191             final Map<String,String> errorInfo = ImmutableMap.<String,String>builder()
 192                     .put( "actual-message-id", outputMsgId )
 193                     .put( "expected-message-id", inputMsgId )
 194                     .build();
 195
 196             throw new NetconfDocumentedException( "Response message contained unknown \"message-id\"",
 197                     null, NetconfDocumentedException.ErrorType.PROTOCOL,
 198                     NetconfDocumentedException.ErrorTag.BAD_ATTRIBUTE,
 199                     NetconfDocumentedException.ErrorSeverity.ERROR, errorInfo);
 200         }
 201     }
 202
 203     public static void checkSuccessReply(final NetconfMessage output) throws NetconfDocumentedException {
 204         if(NetconfMessageUtil.isErrorMessage(output)) {
 205             throw NetconfDocumentedException.fromXMLDocument(output.getDocument());
 206         }
 207     }
 208
 209     public static RpcError toRpcError( final NetconfDocumentedException ex ) {
 210         final StringBuilder infoBuilder = new StringBuilder();
 211         final Map<String, String> errorInfo = ex.getErrorInfo();
 212         if(errorInfo != null) {
 213             for( final Entry<String,String> e: errorInfo.entrySet() ) {
 214                 infoBuilder.append( '<' ).append( e.getKey() ).append( '>' ).append( e.getValue() )
 215                 .append( "</" ).append( e.getKey() ).append( '>' );
 216
 217             }
 218         }
 219
 220         final ErrorSeverity severity = toRpcErrorSeverity( ex.getErrorSeverity() );
 221         return severity == ErrorSeverity.ERROR ?
 222                 RpcResultBuilder.newError(
 223                         toRpcErrorType( ex.getErrorType() ), ex.getErrorTag().getTagValue(),
 224                         ex.getLocalizedMessage(), null, infoBuilder.toString(), ex.getCause() ) :
 225                             RpcResultBuilder.newWarning(
 226                                     toRpcErrorType( ex.getErrorType() ), ex.getErrorTag().getTagValue(),
 227                                     ex.getLocalizedMessage(), null, infoBuilder.toString(), ex.getCause() );
 228     }
 229
 230     private static ErrorSeverity toRpcErrorSeverity( final NetconfDocumentedException.ErrorSeverity severity ) {
 231         switch (severity) {
 232             case WARNING:
 233                 return RpcError.ErrorSeverity.WARNING;
 234             default:
 235                 return RpcError.ErrorSeverity.ERROR;
 236         }
 237     }
 238
 239     private static RpcError.ErrorType toRpcErrorType(final NetconfDocumentedException.ErrorType type) {
 240         switch (type) {
 241             case PROTOCOL:
 242             return RpcError.ErrorType.PROTOCOL;
 243             case RPC:
 244             return RpcError.ErrorType.RPC;
 245             case TRANSPORT:
 246             return RpcError.ErrorType.TRANSPORT;
 247         default:
 248             return RpcError.ErrorType.APPLICATION;
 249         }
 250     }
 251
 252     public static NodeIdentifier toId(final PathArgument qname) {
 253         return toId(qname.getNodeType());
 254     }
 255
 256     public static NodeIdentifier toId(final QName nodeType) {
 257         return new NodeIdentifier(nodeType);
 258     }
 259
 260     public static Element getDataSubtree(final Document doc) {
 261         return (Element) doc.getElementsByTagNameNS(NETCONF_URI.toString(), "data").item(0);
 262     }
 263
 264     public static boolean isDataRetrievalOperation(final QName rpc) {
 265         return NETCONF_URI.equals(rpc.getNamespace())
 266                 && (NETCONF_GET_CONFIG_QNAME.getLocalName().equals(rpc.getLocalName())
 267                 || NETCONF_GET_QNAME.getLocalName().equals(rpc.getLocalName()));
 268     }
 269
 270     public static ContainerSchemaNode createSchemaForDataRead(final SchemaContext schemaContext) {
 271         return new NodeContainerProxy(NETCONF_DATA_QNAME, schemaContext.getChildNodes());
 272     }
 273
 274     public static ContainerSchemaNode createSchemaForNotification(final NotificationDefinition next) {
 275         return new NodeContainerProxy(next.getQName(), next.getChildNodes(), next.getAvailableAugmentations());
 276     }
 277
 278     public static ContainerNode wrap(final QName name, final DataContainerChild<?, ?>... node) {
 279         return Builders.containerBuilder().withNodeIdentifier(toId(name)).withValue(ImmutableList.copyOf(node)).build();
 280     }
 281
 282     public static AnyXmlNode createEditConfigAnyxml(final SchemaContext ctx, final YangInstanceIdentifier dataPath,
 283                                                                      final Optional<ModifyAction> operation, final Optional<NormalizedNode<?, ?>> lastChildOverride) {
 284         final NormalizedNode<?, ?> configContent;
 285
 286         if (dataPath.isEmpty()) {
 287             Preconditions.checkArgument(lastChildOverride.isPresent(), "Data has to be present when creating structure for top level element");
 288             Preconditions.checkArgument(lastChildOverride.get() instanceof DataContainerChild<?, ?>,
 289                     "Data has to be either container or a list node when creating structure for top level element, but was: %s", lastChildOverride.get());
 290             configContent = lastChildOverride.get();
 291         } else {
 292             final Entry<QName, ModifyAction> modifyOperation =
 293                     operation.isPresent() ? new AbstractMap.SimpleEntry<>(NETCONF_OPERATION_QNAME, operation.get()) : null;
 294             configContent = ImmutableNodes.fromInstanceId(ctx, dataPath, lastChildOverride, Optional.fromNullable(modifyOperation));
 295         }
 296
 297         final Element element = XmlUtil.createElement(BLANK_DOCUMENT, NETCONF_CONFIG_QNAME.getLocalName(), Optional.of(NETCONF_CONFIG_QNAME.getNamespace().toString()));
 298         try {
 299             NetconfUtil.writeNormalizedNode(configContent, new DOMResult(element), SchemaPath.ROOT, ctx);
 300         } catch (IOException | XMLStreamException e) {
 301             throw new IllegalStateException("Unable to serialize edit config content element for path " + dataPath, e);
 302         }
 303         final DOMSource value = new DOMSource(element);
 304
 305         return Builders.anyXmlBuilder().withNodeIdentifier(toId(NETCONF_CONFIG_QNAME)).withValue(value).build();
 306     }
 307
 308     public static DataContainerChild<?, ?> createEditConfigStructure(final SchemaContext ctx, final YangInstanceIdentifier dataPath,
 309                                                                      final Optional<ModifyAction> operation, final Optional<NormalizedNode<?, ?>> lastChildOverride) {
 310         return Builders.choiceBuilder().withNodeIdentifier(toId(EditContent.QNAME))
 311                 .withChild(createEditConfigAnyxml(ctx, dataPath, operation, lastChildOverride)).build();
 312     }
 313
 314     public static SchemaPath toPath(final QName rpc) {
 315         return SchemaPath.create(true, rpc);
 316     }
 317
 318     public static Map.Entry<Date, XmlElement> stripNotification(final NetconfMessage message) {
 319         final XmlElement xmlElement = XmlElement.fromDomDocument(message.getDocument());
 320         final List<XmlElement> childElements = xmlElement.getChildElements();
 321         Preconditions.checkArgument(childElements.size() == 2, "Unable to parse notification %s, unexpected format.\nExpected 2 childElements," +
 322                 " actual childElements size is %s", message, childElements.size());
 323
 324         final XmlElement eventTimeElement;
 325         final XmlElement notificationElement;
 326
 327         if (childElements.get(0).getName().equals(EVENT_TIME)) {
 328             eventTimeElement = childElements.get(0);
 329             notificationElement = childElements.get(1);
 330         }
 331         else if(childElements.get(1).getName().equals(EVENT_TIME)) {
 332             eventTimeElement = childElements.get(1);
 333             notificationElement = childElements.get(0);
 334         } else {
 335             throw new IllegalArgumentException("Notification payload does not contain " + EVENT_TIME + " " + message);
 336         }
 337
 338         try {
 339             return new AbstractMap.SimpleEntry<>(
 340                     NetconfNotification.RFC3339_DATE_PARSER.apply(eventTimeElement.getTextContent()),
 341                     notificationElement);
 342         } catch (final DocumentedException e) {
 343             throw new IllegalArgumentException("Notification payload does not contain " + EVENT_TIME + " " + message);
 344         } catch (final DateTimeParseException e) {
 345             LOG.warn("Unable to parse event time from {}. Setting time to {}", eventTimeElement, NetconfNotification.UNKNOWN_EVENT_TIME, e);
 346             return new AbstractMap.SimpleEntry<>(NetconfNotification.UNKNOWN_EVENT_TIME, notificationElement);
 347         }
 348     }
 349
 350     public static DOMResult prepareDomResultForRpcRequest(final QName rpcQName, final MessageCounter counter) {
 351         final Document document = XmlUtil.newDocument();
 352         final Element rpcNS =
 353                 document.createElementNS(NETCONF_RPC_QNAME.getNamespace().toString(), NETCONF_RPC_QNAME.getLocalName());
 354         // set msg id
 355         rpcNS.setAttribute(MESSAGE_ID_ATTR, counter.getNewMessageId(MESSAGE_ID_PREFIX));
 356         final Element elementNS = document.createElementNS(rpcQName.getNamespace().toString(), rpcQName.getLocalName());
 357         rpcNS.appendChild(elementNS);
 358         document.appendChild(rpcNS);
 359         return new DOMResult(elementNS);
 360     }
 361
 362     public static void writeNormalizedRpc(final ContainerNode normalized, final DOMResult result,
 363                                           final SchemaPath schemaPath, final SchemaContext baseNetconfCtx) throws IOException, XMLStreamException {
 364         final XMLStreamWriter writer = NetconfUtil.XML_FACTORY.createXMLStreamWriter(result);
 365         try {
 366             try (final NormalizedNodeStreamWriter normalizedNodeStreamWriter =
 367                     XMLStreamNormalizedNodeStreamWriter.create(writer, baseNetconfCtx, schemaPath)) {
 368                 try (final SchemaOrderedNormalizedNodeWriter normalizedNodeWriter =
 369                         new SchemaOrderedNormalizedNodeWriter(normalizedNodeStreamWriter, baseNetconfCtx, schemaPath)) {
 370                     final Collection<DataContainerChild<?, ?>> value = normalized.getValue();
 371                     normalizedNodeWriter.write(value);
 372                     normalizedNodeWriter.flush();
 373                 }
 374             }
 375         } finally {
 376             try {
 377                 writer.close();
 378             } catch (final Exception e) {
 379                LOG.warn("Unable to close resource properly", e);
 380             }
 381         }
 382     }
 383 }