restconf/restconf-nb/src/main/java/org/opendaylight/restconf/nb/rfc8040/streams/XmlDataTreeCandidateSerializer.java

   1 /*
   2  * Copyright (c) 2020 PANTHEON.tech, s.r.o. 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.restconf.nb.rfc8040.streams;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import java.util.Collection;
  13 import javax.xml.stream.XMLStreamWriter;
  14 import org.eclipse.jdt.annotation.NonNull;
  15 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.md.sal.remote.rev140114.DataChangedNotification;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.md.sal.remote.rev140114.data.changed.notification.DataChangeEvent;
  17 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  18 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  19 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
  20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  21 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
  22 import org.opendaylight.yangtools.yang.data.codec.xml.XMLStreamNormalizedNodeStreamWriter;
  23 import org.opendaylight.yangtools.yang.data.tree.api.DataTreeCandidateNode;
  24 import org.opendaylight.yangtools.yang.data.tree.api.ModificationType;
  25 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  26 import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack;
  27 import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack.Inference;
  28
  29 final class XmlDataTreeCandidateSerializer extends AbstractWebsocketSerializer<Exception> {
  30     private static final @NonNull NodeIdentifier DATA_CHANGE_EVENT_NID = NodeIdentifier.create(DataChangeEvent.QNAME);
  31
  32     private final XMLStreamWriter xmlWriter;
  33
  34     XmlDataTreeCandidateSerializer(final EffectiveModelContext context, final XMLStreamWriter xmlWriter) {
  35         super(context);
  36         this.xmlWriter = requireNonNull(xmlWriter);
  37     }
  38
  39     @Override
  40     void serializeData(final Inference parent, final Collection<PathArgument> dataPath,
  41             final DataTreeCandidateNode candidate, final boolean skipData) throws Exception {
  42         final var modificationType = candidate.modificationType();
  43         if (modificationType != ModificationType.UNMODIFIED) {
  44             final var stack = SchemaInferenceStack.of(parent.getEffectiveModelContext());
  45             stack.enterSchemaTree(DataChangedNotification.QNAME);
  46
  47             final var writer = XMLStreamNormalizedNodeStreamWriter.create(xmlWriter, stack.toInference());
  48             writer.startMapNode(DATA_CHANGE_EVENT_NID, 1);
  49
  50             final var path = YangInstanceIdentifier.of(dataPath);
  51             writer.startMapEntryNode(NodeIdentifierWithPredicates.of(DataChangeEvent.QNAME, PATH_QNAME, path), 4);
  52             writer.startLeafNode(PATH_NID);
  53             writer.scalarValue(path);
  54             writer.endNode();
  55
  56             writer.startLeafNode(OPERATION_NID);
  57             writer.scalarValue(modificationTypeToOperation(candidate));
  58             writer.endNode();
  59
  60             if (!skipData) {
  61                 final var dataAfter = getDataAfter(candidate);
  62                 if (dataAfter != null) {
  63                     writer.flush();
  64                     xmlWriter.writeStartElement(DATA_NAME);
  65                     final var nnWriter = NormalizedNodeWriter.forStreamWriter(
  66                         XMLStreamNormalizedNodeStreamWriter.create(xmlWriter, parent));
  67                     nnWriter.write(dataAfter);
  68                     nnWriter.flush();
  69                     xmlWriter.writeEndElement();
  70                 }
  71             }
  72
  73             writer.endNode();
  74             writer.endNode();
  75         }
  76     }
  77 }