Examples of co.cask.cdap.internal.io.TypeRepresentation

co.cask.cdap.internal.io.TypeRepresentation
Helper class to represent a type parameter in a serializable form. It would be simple if we could just use the class name, but we would lose the type parameters of generic classes. If we'd use java.lang.reflect.Type, we'd not be able to serialize easily. So here we implement our own representation of the type: it supports classes and parametrized classes, it also supports static inner classes. However, it does not support interfaces (yet). This class can be serialized to Json and deserialized back without loss. Because it implements ParametrizedType, this class is compatible with TypeToken and we can use it to decode an encoded object of this type.

   * @throws UnsupportedTypeException
   */
  public static DatasetProperties objectStoreProperties(Type type, DatasetProperties props)
    throws UnsupportedTypeException {
    Schema schema = new ReflectionSchemaGenerator().generate(type);
    TypeRepresentation typeRep = new TypeRepresentation(type);
    return DatasetProperties.builder()
      .add("schema", GSON.toJson(schema))
      .add("type", GSON.toJson(typeRep))
      .addAll(props.getProperties())
      .build();

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  public ObjectStoreDataset<?> getDataset(DatasetSpecification spec,
                                          Map<String, String> arguments, ClassLoader classLoader) throws IOException {
    DatasetSpecification kvTableSpec = spec.getSpecification("objects");
    KeyValueTable table = tableDef.getDataset(kvTableSpec, arguments, classLoader);


    TypeRepresentation typeRep = GSON.fromJson(spec.getProperty("type"), TypeRepresentation.class);
    Schema schema = GSON.fromJson(spec.getProperty("schema"), Schema.class);
    return new ObjectStoreDataset(spec.getName(), table, typeRep, schema, classLoader);
  }

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Related Classes of co.cask.cdap.internal.io.TypeRepresentation

co.cask.cdap.api.dataset.lib.ObjectStores

co.cask.cdap.data2.dataset2.lib.table.ObjectStoreDefinition

java.lang.reflect.Type

java.lang.reflect.ParameterizedType

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