opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/tree/data/NoopDataTreeCandidate.java

   1 /*
   2  * Copyright (c) 2014 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.md.sal.dom.store.impl.tree.data;
   9
  10 import java.util.Collections;
  11
  12 import org.opendaylight.controller.md.sal.dom.store.impl.tree.DataTreeCandidateNode;
  13 import org.opendaylight.controller.md.sal.dom.store.impl.tree.ModificationType;
  14 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier;
  15 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier.PathArgument;
  16 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  17
  18 import com.google.common.base.Optional;
  19 import com.google.common.base.Preconditions;
  20
  21 final class NoopDataTreeCandidate extends AbstractDataTreeCandidate {
  22     private static final DataTreeCandidateNode ROOT = new DataTreeCandidateNode() {
  23         @Override
  24         public ModificationType getModificationType() {
  25             return ModificationType.UNMODIFIED;
  26         }
  27
  28         @Override
  29         public Iterable<DataTreeCandidateNode> getChildNodes() {
  30             return Collections.emptyList();
  31         }
  32
  33         @Override
  34         public PathArgument getIdentifier() {
  35             throw new IllegalStateException("Attempted to read identifier of the no-operation change");
  36         }
  37
  38         @Override
  39         public Optional<NormalizedNode<?, ?>> getDataAfter() {
  40             return Optional.absent();
  41         }
  42
  43         @Override
  44         public Optional<NormalizedNode<?, ?>> getDataBefore() {
  45             return Optional.absent();
  46         }
  47     };
  48
  49     protected NoopDataTreeCandidate(final InstanceIdentifier rootPath, final ModifiedNode modificationRoot) {
  50         super(rootPath);
  51         Preconditions.checkArgument(modificationRoot.getType() == ModificationType.UNMODIFIED);
  52     }
  53
  54     @Override
  55     public DataTreeCandidateNode getRootNode() {
  56         return ROOT;
  57     }
  58 }