opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/DeletedDataTreeCandidateNode.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;
   9
  10 import com.google.common.base.Optional;
  11 import java.util.Collection;
  12 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  13 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  14 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
  15 import org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType;
  16
  17 /**
  18  * A deserialized {@link DataTreeCandidateNode} which represents a deletion.
  19  */
  20 abstract class DeletedDataTreeCandidateNode extends AbstractDataTreeCandidateNode {
  21     private DeletedDataTreeCandidateNode() {
  22         super(ModificationType.DELETE);
  23     }
  24
  25     static DataTreeCandidateNode create() {
  26         return new DeletedDataTreeCandidateNode() {
  27             @Override
  28             public PathArgument getIdentifier() {
  29                 throw new UnsupportedOperationException("Root node does not have an identifier");
  30             }
  31         };
  32     }
  33
  34     static DataTreeCandidateNode create(final PathArgument identifier) {
  35         return new DeletedDataTreeCandidateNode() {
  36             @Override
  37             public final PathArgument getIdentifier() {
  38                 return identifier;
  39             }
  40         };
  41     }
  42
  43     @Override
  44     public final Optional<NormalizedNode<?, ?>> getDataAfter() {
  45         return Optional.absent();
  46     }
  47
  48     @Override
  49     public final Collection<DataTreeCandidateNode> getChildNodes() {
  50         // We would require the before-image to reconstruct the list of nodes which
  51         // were deleted.
  52         throw new UnsupportedOperationException("Children not available after serialization");
  53     }
  54 }