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.controller.md.sal.common.api.data.LogicalDatastoreType;
  13 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  14 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  15 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
  16 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  17 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
  18 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException;
  19 import org.opendaylight.yangtools.yang.data.api.schema.tree.TreeType;
  20 import org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTreeFactory;
  21 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  22
  23 public class NormalizedNodeAggregator {
  24     private final YangInstanceIdentifier rootIdentifier;
  25     private final List<Optional<NormalizedNode<?, ?>>> nodes;
  26     private final DataTree dataTree;
  27
  28     private NormalizedNodeAggregator(final YangInstanceIdentifier rootIdentifier, final List<Optional<NormalizedNode<?, ?>>> nodes,
  29                              final SchemaContext schemaContext, LogicalDatastoreType logicalDatastoreType) {
  30         this.rootIdentifier = rootIdentifier;
  31         this.nodes = nodes;
  32         this.dataTree = InMemoryDataTreeFactory.getInstance().create(
  33                 logicalDatastoreType == LogicalDatastoreType.CONFIGURATION ? TreeType.CONFIGURATION :
  34                     TreeType.OPERATIONAL);
  35         this.dataTree.setSchemaContext(schemaContext);
  36     }
  37
  38     /**
  39      * Combine data from all the nodes in the list into a tree with root as rootIdentifier
  40      *
  41      * @param nodes
  42      * @param schemaContext
  43      * @param logicalDatastoreType
  44      * @return
  45      * @throws DataValidationFailedException
  46      */
  47     public static Optional<NormalizedNode<?,?>> aggregate(final YangInstanceIdentifier rootIdentifier,
  48                                                           final List<Optional<NormalizedNode<?, ?>>> nodes,
  49                                                           final SchemaContext schemaContext,
  50                                                           LogicalDatastoreType logicalDatastoreType) throws DataValidationFailedException {
  51         return new NormalizedNodeAggregator(rootIdentifier, nodes, schemaContext, logicalDatastoreType).aggregate();
  52     }
  53
  54     private Optional<NormalizedNode<?,?>> aggregate() throws DataValidationFailedException {
  55         return combine().getRootNode();
  56     }
  57
  58     private NormalizedNodeAggregator combine() throws DataValidationFailedException {
  59         final DataTreeModification mod = dataTree.takeSnapshot().newModification();
  60
  61         for (final Optional<NormalizedNode<?,?>> node : nodes) {
  62             if (node.isPresent()) {
  63                 mod.merge(rootIdentifier, node.get());
  64             }
  65         }
  66         mod.ready();
  67         dataTree.validate(mod);
  68         final DataTreeCandidate candidate = dataTree.prepare(mod);
  69         dataTree.commit(candidate);
  70
  71         return this;
  72     }
  73
  74     private Optional<NormalizedNode<?, ?>> getRootNode() {
  75         return dataTree.takeSnapshot().readNode(rootIdentifier);
  76     }
  77 }