restconf/sal-rest-connector/src/main/java/org/opendaylight/restconf/restful/utils/ReadDataTransactionUtil.java

   1 /*
   2  * Copyright (c) 2016 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.restconf.restful.utils;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.primitives.Ints;
  12 import com.google.common.util.concurrent.CheckedFuture;
  13 import java.util.Collection;
  14 import java.util.Collections;
  15 import java.util.List;
  16 import java.util.Map;
  17 import java.util.function.Function;
  18 import java.util.stream.Collectors;
  19 import javax.annotation.Nonnull;
  20 import javax.annotation.Nullable;
  21 import javax.ws.rs.core.UriInfo;
  22 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  23 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  24 import org.opendaylight.netconf.sal.restconf.impl.ControllerContext;
  25 import org.opendaylight.netconf.sal.restconf.impl.InstanceIdentifierContext;
  26 import org.opendaylight.netconf.sal.restconf.impl.RestconfDocumentedException;
  27 import org.opendaylight.netconf.sal.restconf.impl.RestconfError;
  28 import org.opendaylight.netconf.sal.restconf.impl.WriterParameters;
  29 import org.opendaylight.netconf.sal.restconf.impl.WriterParameters.WriterParametersBuilder;
  30 import org.opendaylight.restconf.restful.transaction.TransactionVarsWrapper;
  31 import org.opendaylight.restconf.utils.parser.ParserFieldsParameter;
  32 import org.opendaylight.yangtools.yang.common.QName;
  33 import org.opendaylight.yangtools.yang.common.QNameModule;
  34 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  35 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.AugmentationIdentifier;
  36 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  37 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
  38 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  39 import org.opendaylight.yangtools.yang.data.api.schema.AugmentationNode;
  40 import org.opendaylight.yangtools.yang.data.api.schema.ChoiceNode;
  41 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  42 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  43 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
  44 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  45 import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
  46 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  47 import org.opendaylight.yangtools.yang.data.impl.schema.Builders;
  48 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  49 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.CollectionNodeBuilder;
  50 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.DataContainerNodeAttrBuilder;
  51 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.DataContainerNodeBuilder;
  52 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.NormalizedNodeAttrBuilder;
  53 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.NormalizedNodeContainerBuilder;
  54 import org.opendaylight.yangtools.yang.data.util.DataSchemaContextTree;
  55 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
  56 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
  57 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
  58 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
  59 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
  60 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  61
  62 /**
  63  * Util class for read data from data store via transaction.
  64  * <ul>
  65  * <li>config
  66  * <li>state
  67  * <li>all (config + state)
  68  * </ul>
  69  *
  70  */
  71 public final class ReadDataTransactionUtil {
  72
  73     private ReadDataTransactionUtil() {
  74         throw new UnsupportedOperationException("Util class.");
  75     }
  76
  77     /**
  78      * Parse parameters from URI request and check their types and values.
  79      *
  80      *
  81      * @param identifier
  82      *            - {@link InstanceIdentifierContext}
  83      * @param uriInfo
  84      *            - URI info
  85      * @param tagged
  86      *            - set tagged for {@link WriterParameters}
  87      * @return {@link WriterParameters}
  88      */
  89     public static @Nonnull WriterParameters parseUriParameters(@Nonnull final InstanceIdentifierContext<?> identifier,
  90             @Nullable final UriInfo uriInfo, final boolean tagged) {
  91         return parseParams(identifier, uriInfo, tagged);
  92     }
  93
  94     /**
  95      * Parse parameters from URI request and check their types and values.
  96      *
  97      *
  98      * @param identifier
  99      *            - {@link InstanceIdentifierContext}
 100      * @param uriInfo
 101      *            - URI info
 102      * @return {@link WriterParameters}
 103      */
 104     public static @Nonnull WriterParameters parseUriParameters(@Nonnull final InstanceIdentifierContext<?> identifier,
 105                                                                @Nullable final UriInfo uriInfo) {
 106         return parseParams(identifier, uriInfo, false);
 107     }
 108
 109     private static WriterParameters parseParams(final InstanceIdentifierContext<?> identifier, final UriInfo uriInfo,
 110             final boolean tagged) {
 111         final WriterParametersBuilder builder = new WriterParametersBuilder();
 112         builder.setTagged(tagged);
 113
 114         if (uriInfo == null) {
 115             return builder.build();
 116         }
 117
 118         // check only allowed parameters
 119         ParametersUtil.checkParametersTypes(
 120                 RestconfDataServiceConstant.ReadData.READ_TYPE_TX,
 121                 uriInfo.getQueryParameters().keySet(),
 122                 RestconfDataServiceConstant.ReadData.CONTENT,
 123                 RestconfDataServiceConstant.ReadData.DEPTH,
 124                 RestconfDataServiceConstant.ReadData.FIELDS, RestconfDataServiceConstant.ReadData.WITH_DEFAULTS);
 125
 126         // read parameters from URI or set default values
 127         final List<String> content = uriInfo.getQueryParameters().getOrDefault(
 128                 RestconfDataServiceConstant.ReadData.CONTENT,
 129                 Collections.singletonList(RestconfDataServiceConstant.ReadData.ALL));
 130         final List<String> depth = uriInfo.getQueryParameters().getOrDefault(
 131                 RestconfDataServiceConstant.ReadData.DEPTH,
 132                 Collections.singletonList(RestconfDataServiceConstant.ReadData.UNBOUNDED));
 133         // fields
 134         final List<String> fields = uriInfo.getQueryParameters().getOrDefault(
 135                 RestconfDataServiceConstant.ReadData.FIELDS,
 136                 Collections.emptyList());
 137
 138         // parameter can be in URI at most once
 139         ParametersUtil.checkParameterCount(content, RestconfDataServiceConstant.ReadData.CONTENT);
 140         ParametersUtil.checkParameterCount(depth, RestconfDataServiceConstant.ReadData.DEPTH);
 141         ParametersUtil.checkParameterCount(fields, RestconfDataServiceConstant.ReadData.FIELDS);
 142
 143         // check and set content
 144         final String contentValue = content.get(0);
 145         if (!contentValue.equals(RestconfDataServiceConstant.ReadData.ALL)) {
 146             if (!contentValue.equals(RestconfDataServiceConstant.ReadData.CONFIG)
 147                     && !contentValue.equals(RestconfDataServiceConstant.ReadData.NONCONFIG)) {
 148                 throw new RestconfDocumentedException(
 149                         new RestconfError(RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.INVALID_VALUE,
 150                                 "Invalid content parameter: " + contentValue, null,
 151                                 "The content parameter value must be either config, nonconfig or all (default)"));
 152             }
 153         }
 154
 155         builder.setContent(content.get(0));
 156
 157         // check and set depth
 158         if (!depth.get(0).equals(RestconfDataServiceConstant.ReadData.UNBOUNDED)) {
 159             final Integer value = Ints.tryParse(depth.get(0));
 160
 161             if ((value == null)
 162                     || (!((value >= RestconfDataServiceConstant.ReadData.MIN_DEPTH)
 163                         && (value <= RestconfDataServiceConstant.ReadData.MAX_DEPTH)))) {
 164                 throw new RestconfDocumentedException(
 165                         new RestconfError(RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.INVALID_VALUE,
 166                                 "Invalid depth parameter: " + depth, null,
 167                                 "The depth parameter must be an integer between 1 and 65535 or \"unbounded\""));
 168             } else {
 169                 builder.setDepth(value);
 170             }
 171         }
 172
 173         // check and set fields
 174         if (!fields.isEmpty()) {
 175             builder.setFields(ParserFieldsParameter.parseFieldsParameter(identifier, fields.get(0)));
 176         }
 177
 178         return builder.build();
 179     }
 180
 181     /**
 182      * Read specific type of data from data store via transaction.
 183      *
 184      * @param valueOfContent
 185      *            - type of data to read (config, state, all)
 186      * @param transactionNode
 187      *            - {@link TransactionVarsWrapper} - wrapper for variables
 188      * @return {@link NormalizedNode}
 189      */
 190     public static @Nullable NormalizedNode<?, ?> readData(@Nonnull final String valueOfContent,
 191             @Nonnull final TransactionVarsWrapper transactionNode) {
 192         return readData(valueOfContent, transactionNode, null);
 193     }
 194
 195     /**
 196      * Read specific type of data from data store via transaction.
 197      *
 198      * @param valueOfContent
 199      *            - type of data to read (config, state, all)
 200      * @param transactionNode
 201      *            - {@link TransactionVarsWrapper} - wrapper for variables
 202      * @param withDefa
 203      *            - vaule of with-defaults parameter
 204      * @return {@link NormalizedNode}
 205      */
 206     public static @Nullable NormalizedNode<?, ?> readData(@Nonnull final String valueOfContent,
 207             @Nonnull final TransactionVarsWrapper transactionNode, final String withDefa) {
 208         switch (valueOfContent) {
 209             case RestconfDataServiceConstant.ReadData.CONFIG:
 210                 transactionNode.setLogicalDatastoreType(LogicalDatastoreType.CONFIGURATION);
 211                 if (withDefa == null) {
 212                     return readDataViaTransaction(transactionNode);
 213                 } else {
 214                     return prepareDataByParamWithDef(readDataViaTransaction(transactionNode),
 215                             transactionNode.getInstanceIdentifier().getInstanceIdentifier(), withDefa);
 216                 }
 217             case RestconfDataServiceConstant.ReadData.NONCONFIG:
 218                 transactionNode.setLogicalDatastoreType(LogicalDatastoreType.OPERATIONAL);
 219                 return readDataViaTransaction(transactionNode);
 220
 221             case RestconfDataServiceConstant.ReadData.ALL:
 222                 return readAllData(transactionNode, withDefa);
 223
 224             default:
 225                 throw new RestconfDocumentedException(
 226                         new RestconfError(RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.INVALID_VALUE,
 227                                 "Invalid content parameter: " + valueOfContent, null,
 228                                 "The content parameter value must be either config, nonconfig or all (default)"));
 229         }
 230     }
 231
 232     private static NormalizedNode<?, ?> prepareDataByParamWithDef(final NormalizedNode<?, ?> result,
 233             final YangInstanceIdentifier path, final String withDefa) {
 234         boolean trim;
 235         switch (withDefa) {
 236             case "trim":
 237                 trim = true;
 238                 break;
 239             case "explicit":
 240                 trim = false;
 241                 break;
 242             default:
 243                 throw new RestconfDocumentedException("");
 244         }
 245
 246         final SchemaContext ctx = ControllerContext.getInstance().getGlobalSchema();
 247         final DataSchemaContextTree baseSchemaCtxTree = DataSchemaContextTree.from(ctx);
 248         final DataSchemaNode baseSchemaNode = baseSchemaCtxTree.getChild(path).getDataSchemaNode();
 249         if (result instanceof ContainerNode) {
 250             final DataContainerNodeAttrBuilder<NodeIdentifier, ContainerNode> builder =
 251                     Builders.containerBuilder((ContainerSchemaNode) baseSchemaNode);
 252             buildCont(builder, (ContainerNode) result, baseSchemaCtxTree, path, trim);
 253             return builder.build();
 254         } else {
 255             final DataContainerNodeAttrBuilder<NodeIdentifierWithPredicates, MapEntryNode> builder =
 256                     Builders.mapEntryBuilder((ListSchemaNode) baseSchemaNode);
 257             buildMapEntryBuilder(builder, (MapEntryNode) result, baseSchemaCtxTree, path, trim,
 258                     ((ListSchemaNode) baseSchemaNode).getKeyDefinition());
 259             return builder.build();
 260         }
 261     }
 262
 263     private static void buildMapEntryBuilder(
 264             final DataContainerNodeAttrBuilder<NodeIdentifierWithPredicates, MapEntryNode> builder,
 265             final MapEntryNode result, final DataSchemaContextTree baseSchemaCtxTree,
 266             final YangInstanceIdentifier actualPath, final boolean trim, final List<QName> keys) {
 267         for (final DataContainerChild<? extends PathArgument, ?> child : result.getValue()) {
 268             final YangInstanceIdentifier path = actualPath.node(child.getIdentifier());
 269             final DataSchemaNode childSchema = baseSchemaCtxTree.getChild(path).getDataSchemaNode();
 270             if (child instanceof ContainerNode) {
 271                 final DataContainerNodeAttrBuilder<NodeIdentifier, ContainerNode> childBuilder =
 272                         Builders.containerBuilder((ContainerSchemaNode) childSchema);
 273                 buildCont(childBuilder, (ContainerNode) child, baseSchemaCtxTree, path, trim);
 274                 builder.withChild(childBuilder.build());
 275             } else if (child instanceof MapNode) {
 276                 final CollectionNodeBuilder<MapEntryNode, MapNode> childBuilder =
 277                         Builders.mapBuilder((ListSchemaNode) childSchema);
 278                 buildList(childBuilder, (MapNode) child, baseSchemaCtxTree, path, trim,
 279                         ((ListSchemaNode) childSchema).getKeyDefinition());
 280                 builder.withChild(childBuilder.build());
 281             } else if (child instanceof LeafNode) {
 282                 final String defaultVal = ((LeafSchemaNode) childSchema).getDefault();
 283                 final String nodeVal = ((LeafNode<String>) child).getValue();
 284                 final NormalizedNodeAttrBuilder<NodeIdentifier, Object, LeafNode<Object>> leafBuilder =
 285                         Builders.leafBuilder((LeafSchemaNode) childSchema);
 286                 if (keys.contains(child.getNodeType())) {
 287                     leafBuilder.withValue(((LeafNode) child).getValue());
 288                     builder.withChild(leafBuilder.build());
 289                 } else {
 290                     if (trim) {
 291                         if ((defaultVal == null) || !defaultVal.equals(nodeVal)) {
 292                             leafBuilder.withValue(((LeafNode) child).getValue());
 293                             builder.withChild(leafBuilder.build());
 294                         }
 295                     } else {
 296                         if ((defaultVal != null) && defaultVal.equals(nodeVal)) {
 297                             leafBuilder.withValue(((LeafNode) child).getValue());
 298                             builder.withChild(leafBuilder.build());
 299                         }
 300                     }
 301                 }
 302             }
 303         }
 304     }
 305
 306     private static void buildList(final CollectionNodeBuilder<MapEntryNode, MapNode> builder, final MapNode result,
 307             final DataSchemaContextTree baseSchemaCtxTree, final YangInstanceIdentifier path, final boolean trim,
 308             final List<QName> keys) {
 309         for (final MapEntryNode mapEntryNode : result.getValue()) {
 310             final YangInstanceIdentifier actualNode = path.node(mapEntryNode.getIdentifier());
 311             final DataSchemaNode childSchema = baseSchemaCtxTree.getChild(actualNode).getDataSchemaNode();
 312             final DataContainerNodeAttrBuilder<NodeIdentifierWithPredicates, MapEntryNode> mapEntryBuilder =
 313                     Builders.mapEntryBuilder((ListSchemaNode) childSchema);
 314             buildMapEntryBuilder(mapEntryBuilder, mapEntryNode, baseSchemaCtxTree, actualNode, trim, keys);
 315             builder.withChild(mapEntryBuilder.build());
 316         }
 317     }
 318
 319     private static void buildCont(final DataContainerNodeAttrBuilder<NodeIdentifier, ContainerNode> builder,
 320             final ContainerNode result, final DataSchemaContextTree baseSchemaCtxTree,
 321             final YangInstanceIdentifier actualPath, final boolean trim) {
 322         for (final DataContainerChild<? extends PathArgument, ?> child : result.getValue()) {
 323             final YangInstanceIdentifier path = actualPath.node(child.getIdentifier());
 324             final DataSchemaNode childSchema = baseSchemaCtxTree.getChild(path).getDataSchemaNode();
 325             if (child instanceof ContainerNode) {
 326                 final DataContainerNodeAttrBuilder<NodeIdentifier, ContainerNode> builderChild =
 327                         Builders.containerBuilder((ContainerSchemaNode) childSchema);
 328                 buildCont(builderChild, result, baseSchemaCtxTree, actualPath, trim);
 329                 builder.withChild(builderChild.build());
 330             } else if (child instanceof MapNode) {
 331                 final CollectionNodeBuilder<MapEntryNode, MapNode> childBuilder =
 332                         Builders.mapBuilder((ListSchemaNode) childSchema);
 333                 buildList(childBuilder, (MapNode) child, baseSchemaCtxTree, path, trim,
 334                         ((ListSchemaNode) childSchema).getKeyDefinition());
 335                 builder.withChild(childBuilder.build());
 336             } else if (child instanceof LeafNode) {
 337                 final String defaultVal = ((LeafSchemaNode) childSchema).getDefault();
 338                 final String nodeVal = ((LeafNode<String>) child).getValue();
 339                 final NormalizedNodeAttrBuilder<NodeIdentifier, Object, LeafNode<Object>> leafBuilder =
 340                         Builders.leafBuilder((LeafSchemaNode) childSchema);
 341                 if (trim) {
 342                     if ((defaultVal == null) || !defaultVal.equals(nodeVal)) {
 343                         leafBuilder.withValue(((LeafNode) child).getValue());
 344                         builder.withChild(leafBuilder.build());
 345                     }
 346                 } else {
 347                     if ((defaultVal != null) && defaultVal.equals(nodeVal)) {
 348                         leafBuilder.withValue(((LeafNode) child).getValue());
 349                         builder.withChild(leafBuilder.build());
 350                     }
 351                 }
 352             }
 353         }
 354     }
 355
 356     /**
 357      * If is set specific {@link LogicalDatastoreType} in
 358      * {@link TransactionVarsWrapper}, then read this type of data from DS. If
 359      * don't, we have to read all data from DS (state + config)
 360      *
 361      * @param transactionNode
 362      *            - {@link TransactionVarsWrapper} - wrapper for variables
 363      * @return {@link NormalizedNode}
 364      */
 365     private static @Nullable NormalizedNode<?, ?> readDataViaTransaction(
 366             @Nonnull final TransactionVarsWrapper transactionNode) {
 367         final CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> listenableFuture = transactionNode
 368                 .getTransactionChain().newReadOnlyTransaction().read(transactionNode.getLogicalDatastoreType(),
 369                         transactionNode.getInstanceIdentifier().getInstanceIdentifier());
 370         final NormalizedNodeFactory dataFactory = new NormalizedNodeFactory();
 371         FutureCallbackTx.addCallback(listenableFuture, RestconfDataServiceConstant.ReadData.READ_TYPE_TX,
 372                 dataFactory);
 373         return dataFactory.build();
 374     }
 375
 376     /**
 377      * Read config and state data, then map them.
 378      *
 379      * @param transactionNode
 380      *            - {@link TransactionVarsWrapper} - wrapper for variables
 381      * @param withDefa
 382      * @return {@link NormalizedNode}
 383      */
 384     private static @Nullable NormalizedNode<?, ?> readAllData(@Nonnull final TransactionVarsWrapper transactionNode,
 385             final String withDefa) {
 386         // PREPARE STATE DATA NODE
 387         transactionNode.setLogicalDatastoreType(LogicalDatastoreType.OPERATIONAL);
 388         final NormalizedNode<?, ?> stateDataNode = readDataViaTransaction(transactionNode);
 389
 390         // PREPARE CONFIG DATA NODE
 391         transactionNode.setLogicalDatastoreType(LogicalDatastoreType.CONFIGURATION);
 392         final NormalizedNode<?, ?> configDataNode;
 393         if (withDefa == null) {
 394             configDataNode = readDataViaTransaction(transactionNode);
 395         } else {
 396             configDataNode = prepareDataByParamWithDef(readDataViaTransaction(transactionNode),
 397                     transactionNode.getInstanceIdentifier().getInstanceIdentifier(), withDefa);
 398         }
 399
 400         // if no data exists
 401         if ((stateDataNode == null) && (configDataNode == null)) {
 402             return null;
 403         }
 404
 405         // return config data
 406         if (stateDataNode == null) {
 407             return configDataNode;
 408         }
 409
 410         // return state data
 411         if (configDataNode == null) {
 412             return stateDataNode;
 413         }
 414
 415         // merge data from config and state
 416         return mapNode(stateDataNode, configDataNode);
 417     }
 418
 419     /**
 420      * Map data by type of read node.
 421      *
 422      * @param stateDataNode
 423      *            - data node of state data
 424      * @param configDataNode
 425      *            - data node of config data
 426      * @return {@link NormalizedNode}
 427      */
 428     private static @Nonnull NormalizedNode<?, ?> mapNode(@Nonnull final NormalizedNode<?, ?> stateDataNode,
 429                                                          @Nonnull final NormalizedNode<?, ?> configDataNode) {
 430         validPossibilityOfMergeNodes(stateDataNode, configDataNode);
 431         if (configDataNode instanceof RpcDefinition) {
 432             return prepareRpcData(configDataNode, stateDataNode);
 433         } else {
 434             return prepareData(configDataNode, stateDataNode);
 435         }
 436     }
 437
 438     /**
 439      * Valid of can be data merged together.
 440      *
 441      * @param stateDataNode
 442      *            - data node of state data
 443      * @param configDataNode
 444      *            - data node of config data
 445      */
 446     private static void validPossibilityOfMergeNodes(@Nonnull final NormalizedNode<?, ?> stateDataNode,
 447                                                      @Nonnull final NormalizedNode<?, ?> configDataNode) {
 448         final QNameModule moduleOfStateData = stateDataNode.getIdentifier().getNodeType().getModule();
 449         final QNameModule moduleOfConfigData = configDataNode.getIdentifier().getNodeType().getModule();
 450         if (moduleOfStateData != moduleOfConfigData) {
 451             throw new RestconfDocumentedException("It is not possible to merge ");
 452         }
 453     }
 454
 455     /**
 456      * Prepare and map data for rpc
 457      *
 458      * @param configDataNode
 459      *            - data node of config data
 460      * @param stateDataNode
 461      *            - data node of state data
 462      * @return {@link NormalizedNode}
 463      */
 464     private static @Nonnull NormalizedNode<?, ?> prepareRpcData(@Nonnull final NormalizedNode<?, ?> configDataNode,
 465                                                                 @Nonnull final NormalizedNode<?, ?> stateDataNode) {
 466         final DataContainerNodeBuilder<NodeIdentifierWithPredicates, MapEntryNode> mapEntryBuilder = ImmutableNodes
 467                 .mapEntryBuilder();
 468         mapEntryBuilder.withNodeIdentifier((NodeIdentifierWithPredicates) configDataNode.getIdentifier());
 469
 470         // MAP CONFIG DATA
 471         mapRpcDataNode(configDataNode, mapEntryBuilder);
 472         // MAP STATE DATA
 473         mapRpcDataNode(stateDataNode, mapEntryBuilder);
 474
 475         return ImmutableNodes.mapNodeBuilder(configDataNode.getNodeType()).addChild(mapEntryBuilder.build()).build();
 476     }
 477
 478     /**
 479      * Map node to map entry builder.
 480      *
 481      * @param dataNode
 482      *            - data node
 483      * @param mapEntryBuilder
 484      *            - builder for mapping data
 485      */
 486     private static void mapRpcDataNode(@Nonnull final NormalizedNode<?, ?> dataNode,
 487                                        @Nonnull final DataContainerNodeBuilder<
 488                                                NodeIdentifierWithPredicates, MapEntryNode> mapEntryBuilder) {
 489         ((ContainerNode) dataNode).getValue().forEach(mapEntryBuilder::addChild);
 490     }
 491
 492     /**
 493      * Prepare and map all data from DS
 494      *
 495      * @param configDataNode
 496      *            - data node of config data
 497      * @param stateDataNode
 498      *            - data node of state data
 499      * @return {@link NormalizedNode}
 500      */
 501     private static @Nonnull NormalizedNode<?, ?> prepareData(@Nonnull final NormalizedNode<?, ?> configDataNode,
 502                                                              @Nonnull final NormalizedNode<?, ?> stateDataNode) {
 503         if (configDataNode instanceof MapNode) {
 504             final CollectionNodeBuilder<MapEntryNode, MapNode> builder = ImmutableNodes
 505                     .mapNodeBuilder().withNodeIdentifier(((MapNode) configDataNode).getIdentifier());
 506
 507             mapValueToBuilder(
 508                     ((MapNode) configDataNode).getValue(), ((MapNode) stateDataNode).getValue(), builder);
 509
 510             return builder.build();
 511         } else if (configDataNode instanceof MapEntryNode) {
 512             final DataContainerNodeBuilder<NodeIdentifierWithPredicates, MapEntryNode> builder = ImmutableNodes
 513                     .mapEntryBuilder().withNodeIdentifier(((MapEntryNode) configDataNode).getIdentifier());
 514
 515             mapValueToBuilder(
 516                     ((MapEntryNode) configDataNode).getValue(), ((MapEntryNode) stateDataNode).getValue(), builder);
 517
 518             return builder.build();
 519         } else if (configDataNode instanceof ContainerNode) {
 520             final DataContainerNodeAttrBuilder<NodeIdentifier, ContainerNode> builder = Builders
 521                     .containerBuilder().withNodeIdentifier(((ContainerNode) configDataNode).getIdentifier());
 522
 523             mapValueToBuilder(
 524                     ((ContainerNode) configDataNode).getValue(), ((ContainerNode) stateDataNode).getValue(), builder);
 525
 526             return builder.build();
 527         } else if (configDataNode instanceof AugmentationNode) {
 528             final DataContainerNodeBuilder<AugmentationIdentifier, AugmentationNode> builder = Builders
 529                     .augmentationBuilder().withNodeIdentifier(((AugmentationNode) configDataNode).getIdentifier());
 530
 531             mapValueToBuilder(
 532                     ((AugmentationNode) configDataNode).getValue(), ((AugmentationNode) stateDataNode).getValue(), builder);
 533
 534             return builder.build();
 535         } else if (configDataNode instanceof ChoiceNode) {
 536             final DataContainerNodeBuilder<NodeIdentifier, ChoiceNode> builder = Builders
 537                     .choiceBuilder().withNodeIdentifier(((ChoiceNode) configDataNode).getIdentifier());
 538
 539             mapValueToBuilder(
 540                     ((ChoiceNode) configDataNode).getValue(), ((ChoiceNode) stateDataNode).getValue(), builder);
 541
 542             return builder.build();
 543         } else if (configDataNode instanceof LeafNode) {
 544             return ImmutableNodes.leafNode(configDataNode.getNodeType(), configDataNode.getValue());
 545         } else {
 546             throw new RestconfDocumentedException("Bad type of node.");
 547         }
 548     }
 549
 550     /**
 551      * Map value from container node to builder.
 552      *
 553      * @param configData
 554      *            - collection of config data nodes
 555      * @param stateData
 556      *            - collection of state data nodes
 557      * @param builder
 558      *            - builder
 559      */
 560     private static <T extends NormalizedNode<? extends PathArgument, ?>> void mapValueToBuilder(
 561             @Nonnull final Collection<T> configData,
 562             @Nonnull final Collection<T> stateData,
 563             @Nonnull final NormalizedNodeContainerBuilder<?, PathArgument, T, ?> builder) {
 564         final Map<PathArgument, T> configMap = configData.stream().collect(
 565                 Collectors.toMap(NormalizedNode::getIdentifier, Function.identity()));
 566         final Map<PathArgument, T> stateMap = stateData.stream().collect(
 567                 Collectors.toMap(NormalizedNode::getIdentifier, Function.identity()));
 568
 569         // merge config and state data of children with different identifiers
 570         mapDataToBuilder(configMap, stateMap, builder);
 571
 572         // merge config and state data of children with the same identifiers
 573         mergeDataToBuilder(configMap, stateMap, builder);
 574     }
 575
 576     /**
 577      * Map data with different identifiers to builder. Data with different identifiers can be just added
 578      * as childs to parent node.
 579      *
 580      * @param configMap
 581      *            - map of config data nodes
 582      * @param stateMap
 583      *            - map of state data nodes
 584      * @param builder
 585      *           - builder
 586      */
 587     private static <T extends NormalizedNode<? extends PathArgument, ?>> void mapDataToBuilder(
 588             @Nonnull final Map<PathArgument, T> configMap,
 589             @Nonnull final Map<PathArgument, T> stateMap,
 590             @Nonnull final NormalizedNodeContainerBuilder<?, PathArgument, T, ?> builder) {
 591         configMap.entrySet().stream().filter(x -> !stateMap.containsKey(x.getKey())).forEach(
 592                 y -> builder.addChild(y.getValue()));
 593         stateMap.entrySet().stream().filter(x -> !configMap.containsKey(x.getKey())).forEach(
 594                 y -> builder.addChild(y.getValue()));
 595     }
 596
 597     /**
 598      * Map data with the same identifiers to builder. Data with the same identifiers cannot be just added but we need to
 599      * go one level down with {@code prepareData} method.
 600      *
 601      * @param configMap
 602      *            - immutable config data
 603      * @param stateMap
 604      *            - immutable state data
 605      * @param builder
 606      *           - builder
 607      */
 608     @SuppressWarnings("unchecked")
 609     private static <T extends NormalizedNode<? extends PathArgument, ?>> void mergeDataToBuilder(
 610             @Nonnull final Map<PathArgument, T> configMap,
 611             @Nonnull final Map<PathArgument, T> stateMap,
 612             @Nonnull final NormalizedNodeContainerBuilder<?, PathArgument, T, ?> builder) {
 613         // it is enough to process only config data because operational contains the same data
 614         configMap.entrySet().stream().filter(x -> stateMap.containsKey(x.getKey())).forEach(
 615                 y -> builder.addChild((T) prepareData(y.getValue(), stateMap.get(y.getKey()))));
 616     }
 617 }