restconf/restconf-nb/src/main/java/org/opendaylight/restconf/nb/rfc8040/rests/utils/TransactionUtil.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.nb.rfc8040.rests.utils;
   9
  10 import java.util.ArrayList;
  11 import java.util.Iterator;
  12 import java.util.List;
  13 import org.opendaylight.restconf.nb.rfc8040.rests.transactions.RestconfTransaction;
  14 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  15 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  16 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  17 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  18 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  19 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  20
  21 /**
  22  * Util class for common methods of transactions.
  23  */
  24 public final class TransactionUtil {
  25     private TransactionUtil() {
  26         // Hidden on purpose
  27     }
  28
  29     /**
  30      * Merged parents of data.
  31      *
  32      * @param path          path of data
  33      * @param schemaContext {@link SchemaContext}
  34      * @param transaction   A handle to a set of DS operations
  35      */
  36     // FIXME: this method should only be invoked in MdsalRestconfStrategy, and even then only if we are crossing
  37     //        an implicit list.
  38     public static void ensureParentsByMerge(final YangInstanceIdentifier path,
  39                                             final EffectiveModelContext schemaContext,
  40                                             final RestconfTransaction transaction) {
  41         final List<PathArgument> normalizedPathWithoutChildArgs = new ArrayList<>();
  42         YangInstanceIdentifier rootNormalizedPath = null;
  43
  44         final Iterator<PathArgument> it = path.getPathArguments().iterator();
  45
  46         while (it.hasNext()) {
  47             final PathArgument pathArgument = it.next();
  48             if (rootNormalizedPath == null) {
  49                 rootNormalizedPath = YangInstanceIdentifier.create(pathArgument);
  50             }
  51
  52             if (it.hasNext()) {
  53                 normalizedPathWithoutChildArgs.add(pathArgument);
  54             }
  55         }
  56
  57         if (normalizedPathWithoutChildArgs.isEmpty()) {
  58             return;
  59         }
  60
  61         final NormalizedNode parentStructure = ImmutableNodes.fromInstanceId(schemaContext,
  62                 YangInstanceIdentifier.create(normalizedPathWithoutChildArgs));
  63         transaction.merge(rootNormalizedPath, parentStructure);
  64     }
  65 }