opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/utils/NormalizedNodeAggregator.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 package org.opendaylight.controller.cluster.datastore.utils;
   9
  10 import com.google.common.base.Optional;
  11 import java.util.List;
  12 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  13 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  14 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
  15 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  16 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
  17 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException;
  18 import org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTreeFactory;
  19 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  20
  21 public class NormalizedNodeAggregator {
  22     private final YangInstanceIdentifier rootIdentifier;
  23     private final List<Optional<NormalizedNode<?, ?>>> nodes;
  24     private final DataTree dataTree;
  25
  26     private NormalizedNodeAggregator(YangInstanceIdentifier rootIdentifier, List<Optional<NormalizedNode<?, ?>>> nodes,
  27                              SchemaContext schemaContext) {
  28         this.rootIdentifier = rootIdentifier;
  29         this.nodes = nodes;
  30         this.dataTree = InMemoryDataTreeFactory.getInstance().create();
  31         this.dataTree.setSchemaContext(schemaContext);
  32     }
  33
  34     /**
  35      * Combine data from all the nodes in the list into a tree with root as rootIdentifier
  36      *
  37      * @param nodes
  38      * @param schemaContext
  39      * @return
  40      * @throws DataValidationFailedException
  41      */
  42     public static Optional<NormalizedNode<?,?>> aggregate(YangInstanceIdentifier rootIdentifier,
  43                                                           List<Optional<NormalizedNode<?, ?>>> nodes,
  44                                                           SchemaContext schemaContext) throws DataValidationFailedException {
  45         return new NormalizedNodeAggregator(rootIdentifier, nodes, schemaContext).aggregate();
  46     }
  47
  48     private Optional<NormalizedNode<?,?>> aggregate() throws DataValidationFailedException {
  49         return combine().getRootNode();
  50     }
  51
  52     private NormalizedNodeAggregator combine() throws DataValidationFailedException {
  53         DataTreeModification mod = dataTree.takeSnapshot().newModification();
  54
  55         for (Optional<NormalizedNode<?,?>> node : nodes) {
  56             if (node.isPresent()) {
  57                 mod.merge(rootIdentifier, node.get());
  58             }
  59         }
  60
  61         dataTree.validate(mod);
  62         final DataTreeCandidate candidate = dataTree.prepare(mod);
  63         dataTree.commit(candidate);
  64
  65         return this;
  66     }
  67
  68     private Optional<NormalizedNode<?, ?>> getRootNode() {
  69         return dataTree.takeSnapshot().readNode(rootIdentifier);
  70     }
  71 }