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