restconf/restconf-nb-rfc8040/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
  12 import com.google.gson.stream.JsonWriter;
  13 import java.io.IOException;
  14 import java.util.Collection;
  15 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  16 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  17 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  18 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
  19 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
  20 import org.opendaylight.yangtools.yang.data.codec.gson.JSONNormalizedNodeStreamWriter;
  21 import org.opendaylight.yangtools.yang.data.tree.api.DataTreeCandidateNode;
  22 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  23 import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack.Inference;
  24
  25 final class JsonDataTreeCandidateSerializer extends AbstractWebsocketSerializer<IOException> {
  26     private final JSONCodecFactorySupplier codecSupplier;
  27     private final JsonWriter jsonWriter;
  28
  29     JsonDataTreeCandidateSerializer(final EffectiveModelContext context,
  30             final JSONCodecFactorySupplier codecSupplier, final JsonWriter jsonWriter) {
  31         super(context);
  32         this.codecSupplier = requireNonNull(codecSupplier);
  33         this.jsonWriter = requireNonNull(jsonWriter);
  34     }
  35
  36     @Override
  37     void serializeData(final Inference parent, final Collection<PathArgument> dataPath,
  38             final DataTreeCandidateNode candidate, final boolean skipData) throws IOException {
  39         NormalizedNodeStreamWriter nestedWriter = JSONNormalizedNodeStreamWriter.createNestedWriter(
  40             codecSupplier.getShared(parent.getEffectiveModelContext()), parent, null, jsonWriter);
  41         jsonWriter.beginObject();
  42         serializePath(dataPath);
  43
  44         if (!skipData && candidate.getDataAfter().isPresent()) {
  45             jsonWriter.name("data").beginObject();
  46             NormalizedNodeWriter nodeWriter = NormalizedNodeWriter.forStreamWriter(nestedWriter);
  47             nodeWriter.write(candidate.getDataAfter().get());
  48             nodeWriter.flush();
  49
  50             // end data
  51             jsonWriter.endObject();
  52         }
  53
  54         serializeOperation(candidate);
  55         jsonWriter.endObject();
  56     }
  57
  58     @Override
  59     void serializeOperation(final DataTreeCandidateNode candidate)
  60             throws IOException {
  61         jsonWriter.name("operation").value(modificationTypeToOperation(candidate, candidate.getModificationType()));
  62     }
  63
  64     @Override
  65     void serializePath(final Collection<YangInstanceIdentifier.PathArgument> pathArguments)
  66             throws IOException {
  67         jsonWriter.name("path").value(convertPath(pathArguments));
  68     }
  69 }