restconf/restconf-nb/src/main/java/org/opendaylight/restconf/nb/rfc8040/streams/listeners/JsonDataTreeCandidateSerializer.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.listeners;
   9
  10 import static java.util.Objects.requireNonNull;
  11 import static org.opendaylight.yangtools.yang.data.codec.gson.JSONNormalizedNodeStreamWriter.createNestedWriter;
  12
  13 import com.google.gson.stream.JsonWriter;
  14 import java.io.IOException;
  15 import java.util.Collection;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.md.sal.remote.rev140114.DataChangedNotification;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.md.sal.remote.rev140114.data.changed.notification.DataChangeEvent;
  18 import org.opendaylight.yangtools.yang.common.XMLNamespace;
  19 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  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.gson.JSONCodecFactorySupplier;
  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.api.stmt.SchemaNodeIdentifier.Absolute;
  27 import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack.Inference;
  28
  29 final class JsonDataTreeCandidateSerializer extends AbstractWebsocketSerializer<IOException> {
  30     private static final XMLNamespace SAL_REMOTE_NS = DataChangedNotification.QNAME.getNamespace();
  31     private static final Absolute DATA_CHANGE_EVENT = Absolute.of(DataChangedNotification.QNAME, DataChangeEvent.QNAME);
  32
  33     private final JSONCodecFactorySupplier codecSupplier;
  34     private final JsonWriter jsonWriter;
  35
  36     JsonDataTreeCandidateSerializer(final EffectiveModelContext context,
  37             final JSONCodecFactorySupplier codecSupplier, final JsonWriter jsonWriter) {
  38         super(context);
  39         this.codecSupplier = requireNonNull(codecSupplier);
  40         this.jsonWriter = requireNonNull(jsonWriter);
  41     }
  42
  43     @Override
  44     void serializeData(final Inference parent, final Collection<PathArgument> dataPath,
  45             final DataTreeCandidateNode candidate, final boolean skipData) throws IOException {
  46         jsonWriter.beginObject();
  47
  48         final var modificationType = candidate.modificationType();
  49         if (modificationType != ModificationType.UNMODIFIED) {
  50             final var codecs = codecSupplier.getShared(parent.getEffectiveModelContext());
  51             try (var writer = createNestedWriter(codecs, DATA_CHANGE_EVENT, SAL_REMOTE_NS, jsonWriter)) {
  52                 writer.startLeafNode(PATH_NID);
  53                 writer.scalarValue(YangInstanceIdentifier.of(dataPath));
  54                 writer.endNode();
  55
  56                 writer.startLeafNode(OPERATION_NID);
  57                 writer.scalarValue(modificationTypeToOperation(candidate));
  58                 writer.endNode();
  59             }
  60
  61             if (!skipData) {
  62                 final var dataAfter = getDataAfter(candidate);
  63                 if (dataAfter != null) {
  64                     jsonWriter.name("data").beginObject();
  65                     try (var writer = createNestedWriter(codecs, parent, SAL_REMOTE_NS, jsonWriter)) {
  66                         NormalizedNodeWriter.forStreamWriter(writer).write(dataAfter).flush();
  67                     }
  68                     jsonWriter.endObject();
  69                 }
  70             }
  71         }
  72
  73         jsonWriter.endObject();
  74     }
  75 }