opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/md/sal/binding/impl/LazyDataObjectModification.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.md.sal.binding.impl;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.base.Preconditions;
  12 import java.util.ArrayList;
  13 import java.util.Collection;
  14 import java.util.Iterator;
  15 import java.util.List;
  16 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  17 import org.opendaylight.yangtools.binding.data.codec.api.BindingCodecTreeNode;
  18 import org.opendaylight.yangtools.yang.binding.Augmentation;
  19 import org.opendaylight.yangtools.yang.binding.ChildOf;
  20 import org.opendaylight.yangtools.yang.binding.DataObject;
  21 import org.opendaylight.yangtools.yang.binding.Identifiable;
  22 import org.opendaylight.yangtools.yang.binding.Identifier;
  23 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  24 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier.PathArgument;
  25 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  26 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  27 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 /**
  32  * Lazily translated {@link DataObjectModification} based on {@link DataTreeCandidateNode}.
  33  *
  34  * {@link LazyDataObjectModification} represents Data tree change event,
  35  * but whole tree is not translated or resolved eagerly, but only child nodes
  36  * which are directly accessed by user of data object modification.
  37  *
  38  * @param <T> Type of Binding Data Object
  39  */
  40 class LazyDataObjectModification<T extends DataObject> implements DataObjectModification<T> {
  41
  42     private final static Logger LOG = LoggerFactory.getLogger(LazyDataObjectModification.class);
  43
  44     private final BindingCodecTreeNode<T> codec;
  45     private final DataTreeCandidateNode domData;
  46     private final PathArgument identifier;
  47     private Collection<DataObjectModification<? extends DataObject>> childNodesCache;
  48
  49     private LazyDataObjectModification(final BindingCodecTreeNode<T> codec, final DataTreeCandidateNode domData) {
  50         this.codec = Preconditions.checkNotNull(codec);
  51         this.domData = Preconditions.checkNotNull(domData);
  52         this.identifier = codec.deserializePathArgument(domData.getIdentifier());
  53     }
  54
  55     static <T extends DataObject> DataObjectModification<T> create(final BindingCodecTreeNode<T> codec,
  56             final DataTreeCandidateNode domData) {
  57         return new LazyDataObjectModification<>(codec,domData);
  58     }
  59
  60     static Collection<DataObjectModification<? extends DataObject>> from(final BindingCodecTreeNode<?> parentCodec,
  61             final Collection<DataTreeCandidateNode> domChildNodes) {
  62         final ArrayList<DataObjectModification<? extends DataObject>> result = new ArrayList<>(domChildNodes.size());
  63         populateList(result, parentCodec, domChildNodes);
  64         return result;
  65     }
  66
  67     private static void populateList(final List<DataObjectModification<? extends DataObject>> result,
  68             final BindingCodecTreeNode<?> parentCodec, final Collection<DataTreeCandidateNode> domChildNodes) {
  69         for (final DataTreeCandidateNode domChildNode : domChildNodes) {
  70             final BindingStructuralType type = BindingStructuralType.from(domChildNode);
  71             if (type != BindingStructuralType.NOT_ADDRESSABLE) {
  72                 /*
  73                  *  Even if type is UNKNOWN, from perspective of BindingStructuralType
  74                  *  we try to load codec for it. We will use that type to further specify
  75                  *  debug log.
  76                  */
  77                 try {
  78                     final BindingCodecTreeNode<?> childCodec =
  79                             parentCodec.yangPathArgumentChild(domChildNode.getIdentifier());
  80                     populateList(result,type, childCodec, domChildNode);
  81                 } catch (final IllegalArgumentException e) {
  82                     if(type == BindingStructuralType.UNKNOWN) {
  83                         LOG.debug("Unable to deserialize unknown DOM node {}",domChildNode,e);
  84                     } else {
  85                         LOG.debug("Binding representation for DOM node {} was not found",domChildNode,e);
  86                     }
  87                 }
  88             }
  89         }
  90     }
  91
  92
  93     private static void populateList(final List<DataObjectModification<? extends DataObject>> result,
  94             final BindingStructuralType type, final BindingCodecTreeNode<?> childCodec,
  95             final DataTreeCandidateNode domChildNode) {
  96         switch (type) {
  97             case INVISIBLE_LIST:
  98                 // We use parent codec intentionally.
  99                 populateListWithSingleCodec(result, childCodec, domChildNode.getChildNodes());
 100                 break;
 101             case INVISIBLE_CONTAINER:
 102                 populateList(result, childCodec, domChildNode.getChildNodes());
 103                 break;
 104             case UNKNOWN:
 105             case VISIBLE_CONTAINER:
 106                 result.add(create(childCodec, domChildNode));
 107             default:
 108                 break;
 109         }
 110     }
 111
 112     private static void populateListWithSingleCodec(final List<DataObjectModification<? extends DataObject>> result,
 113             final BindingCodecTreeNode<?> codec, final Collection<DataTreeCandidateNode> childNodes) {
 114         for (final DataTreeCandidateNode child : childNodes) {
 115             result.add(create(codec, child));
 116         }
 117     }
 118
 119     @Override
 120     public T getDataAfter() {
 121         return deserialize(domData.getDataAfter());
 122     }
 123
 124     @Override
 125     public Class<T> getDataType() {
 126         return codec.getBindingClass();
 127     }
 128
 129     @Override
 130     public PathArgument getIdentifier() {
 131         return identifier;
 132     }
 133
 134     @Override
 135     public DataObjectModification.ModificationType getModificationType() {
 136         switch(domData.getModificationType()) {
 137             case WRITE:
 138                 return DataObjectModification.ModificationType.WRITE;
 139             case SUBTREE_MODIFIED:
 140                 return DataObjectModification.ModificationType.SUBTREE_MODIFIED;
 141             case DELETE:
 142                 return DataObjectModification.ModificationType.DELETE;
 143
 144             default:
 145                 // TODO: Should we lie about modification type instead of exception?
 146                 throw new IllegalStateException("Unsupported DOM Modification type " + domData.getModificationType());
 147         }
 148     }
 149
 150     @Override
 151     public Collection<DataObjectModification<? extends DataObject>> getModifiedChildren() {
 152         if(childNodesCache == null) {
 153             childNodesCache = from(codec,domData.getChildNodes());
 154         }
 155         return childNodesCache;
 156     }
 157
 158     @Override
 159     public DataObjectModification<? extends DataObject> getModifiedChild(final PathArgument arg) {
 160         final List<YangInstanceIdentifier.PathArgument> domArgumentList = new ArrayList<>();
 161         final BindingCodecTreeNode<?> childCodec = codec.bindingPathArgumentChild(arg, domArgumentList);
 162         final Iterator<YangInstanceIdentifier.PathArgument> toEnter = domArgumentList.iterator();
 163         DataTreeCandidateNode current = domData;
 164         while (toEnter.hasNext() && current != null) {
 165             current = current.getModifiedChild(toEnter.next());
 166         }
 167         if (current != null) {
 168             return create(childCodec, current);
 169         }
 170         return null;
 171     }
 172
 173     @Override
 174     @SuppressWarnings("unchecked")
 175     public <C extends Identifiable<K> & ChildOf<? super T>, K extends Identifier<C>> DataObjectModification<C> getModifiedChildListItem(
 176             final Class<C> listItem, final K listKey) {
 177         return (DataObjectModification<C>) getModifiedChild(new InstanceIdentifier.IdentifiableItem<>(listItem, listKey));
 178     }
 179
 180     @Override
 181     @SuppressWarnings("unchecked")
 182     public <C extends ChildOf<? super T>> DataObjectModification<C> getModifiedChildContainer(final Class<C> arg) {
 183         return (DataObjectModification<C>) getModifiedChild(new InstanceIdentifier.Item<>(arg));
 184     }
 185
 186     @Override
 187     @SuppressWarnings("unchecked")
 188     public <C extends Augmentation<T> & DataObject> DataObjectModification<C> getModifiedAugmentation(
 189             final Class<C> augmentation) {
 190         return (DataObjectModification<C>) getModifiedChild(new InstanceIdentifier.Item<>(augmentation));
 191     }
 192
 193     private T deserialize(final Optional<NormalizedNode<?, ?>> dataAfter) {
 194         if(dataAfter.isPresent()) {
 195             return codec.deserialize(dataAfter.get());
 196         }
 197         return null;
 198     }
 199 }