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