tests/honeynode/honeynode-common/src/main/java/io/fd/honeycomb/transportpce/binding/converter/JSONDataObjectConverter.java

   1 /*
   2  * Copyright © 2016 AT&T 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 io.fd.honeycomb.transportpce.binding.converter;
   9
  10 import com.google.gson.stream.JsonReader;
  11 import com.google.gson.stream.JsonWriter;
  12
  13 import io.fd.honeycomb.transportpce.binding.converter.api.DataObjectConverter;
  14 import io.fd.honeycomb.transportpce.test.common.DataStoreContext;
  15
  16 import java.io.IOException;
  17 import java.io.InputStream;
  18 import java.io.InputStreamReader;
  19 import java.io.Reader;
  20 import java.io.StringWriter;
  21 import java.io.Writer;
  22 import java.util.Optional;
  23 import javax.annotation.Nonnull;
  24
  25 import org.opendaylight.yangtools.binding.data.codec.impl.BindingNormalizedNodeCodecRegistry;
  26 import org.opendaylight.yangtools.yang.binding.DataObject;
  27 import org.opendaylight.yangtools.yang.common.QName;
  28 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  29 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  30 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  31 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
  32 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactory;
  33 import org.opendaylight.yangtools.yang.data.codec.gson.JSONNormalizedNodeStreamWriter;
  34 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
  35 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
  36 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
  37 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  38 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
  39 import org.slf4j.Logger;
  40 import org.slf4j.LoggerFactory;
  41
  42 public class JSONDataObjectConverter extends AbstractDataObjectConverter {
  43
  44     private static final Logger LOG = LoggerFactory.getLogger(JSONDataObjectConverter.class);
  45
  46     private JSONDataObjectConverter(SchemaContext schemaContext, BindingNormalizedNodeCodecRegistry codecRegistry) {
  47         super(schemaContext, codecRegistry);
  48     }
  49
  50     /**
  51      * extracts codec and schema context (?).
  52      *
  53      * @param dataStoreContextUtil datastore context util used to extract codec and schema context
  54      * @return {@link AbstractDataObjectConverter}
  55      */
  56     public static DataObjectConverter createWithDataStoreUtil(@Nonnull DataStoreContext dataStoreContextUtil) {
  57         return new JSONDataObjectConverter(dataStoreContextUtil.getSchemaContext(),
  58                 dataStoreContextUtil.getBindingToNormalizedNodeCodec());
  59     }
  60
  61     /**
  62      * extracts codec and schema context (?).
  63      *
  64      * @param schemaContext schema context for converter
  65      * @param codecRegistry codec registry used for converting
  66      * @return converter
  67      */
  68     public static DataObjectConverter createWithSchemaContext(@Nonnull SchemaContext schemaContext,
  69             @Nonnull BindingNormalizedNodeCodecRegistry codecRegistry) {
  70         return new JSONDataObjectConverter(schemaContext, codecRegistry);
  71     }
  72
  73     /**
  74      * Transforms the JSON input stream into normalized nodes.
  75      *
  76      * @param inputStream of the given JSON
  77      * @return {@link Optional} instance of {@link NormalizedNode}.
  78      */
  79     @Override
  80     public Optional<NormalizedNode<? extends YangInstanceIdentifier.PathArgument, ?>> transformIntoNormalizedNode(
  81             @Nonnull InputStream inputStream) {
  82         try {
  83             JsonReader reader = new JsonReader(new InputStreamReader(inputStream, "UTF-8"));
  84             return parseInputJSON(reader);
  85         } catch (IOException e) {
  86             LOG.warn(e.getMessage(), e);
  87             return Optional.empty();
  88         }
  89     }
  90
  91     @Override
  92     public Optional<NormalizedNode<? extends YangInstanceIdentifier.PathArgument, ?>> transformIntoNormalizedNode(
  93             @Nonnull Reader inputReader, SchemaNode parentSchema) {
  94         throw new UnsupportedOperationException("Not Implemented yet");
  95     }
  96
  97     @Override
  98     public Optional<NormalizedNode<? extends YangInstanceIdentifier.PathArgument, ?>> transformIntoNormalizedNode(
  99             @Nonnull Reader inputReader) {
 100         JsonReader reader = new JsonReader(inputReader);
 101         return parseInputJSON(reader);
 102     }
 103
 104     @Override
 105     public <T extends DataObject> Writer writerFromDataObject(@Nonnull DataObject object, Class<T> dataObjectClass,
 106             ConvertType<T> convertType) {
 107         Writer writer = new StringWriter();
 108         JsonWriter jsonWriter = new JsonWriter(writer);
 109         JSONCodecFactory jsonCodecFactory = JSONCodecFactory.createLazy(getSchemaContext());
 110         NormalizedNodeStreamWriter create =
 111                 JSONNormalizedNodeStreamWriter.createExclusiveWriter(jsonCodecFactory, null, null, jsonWriter);
 112
 113         try (NormalizedNodeWriter normalizedNodeWriter = NormalizedNodeWriter.forStreamWriter(create);) {
 114             normalizedNodeWriter
 115                     .write(convertType.toNormalizedNodes(dataObjectClass.cast(object), dataObjectClass).get());
 116         } catch (IOException ioe) {
 117             throw new IllegalStateException(ioe);
 118         }
 119         return writer;
 120     }
 121
 122     @Override
 123     public <T extends DataObject> Writer writerFromRpcDataObject(@Nonnull DataObject object, Class<T> dataObjectClass,
 124             ConvertType<T> convertType, QName rpcOutputQName, String rpcName) {
 125         return null;
 126     }
 127
 128     /**
 129      * Parses the input json with concrete implementation of {@link JsonParserStream}.
 130      *
 131      * @param reader of the given JSON
 132      *
 133      */
 134     private Optional<NormalizedNode<? extends YangInstanceIdentifier.PathArgument, ?>> parseInputJSON(
 135             JsonReader reader) {
 136         NormalizedNodeResult result = new NormalizedNodeResult();
 137         try (NormalizedNodeStreamWriter streamWriter = ImmutableNormalizedNodeStreamWriter.from(result);
 138             JsonParserStream jsonParser = JsonParserStream.create(streamWriter, getSchemaContext(),
 139             getSchemaContext())) {
 140             jsonParser.parse(reader);
 141         } catch (IOException e) {
 142             LOG.warn("An error {} occured during parsing Json input stream", e.getMessage(), e);
 143             return Optional.empty();
 144         }
 145         return Optional.ofNullable(result.getResult());
 146     }
 147
 148 }