| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.carbondata.core.metadata.datatype; |
| |
| import java.io.IOException; |
| |
| import org.apache.carbondata.core.util.DataTypeUtil; |
| |
| import com.google.gson.Gson; |
| import com.google.gson.TypeAdapter; |
| import com.google.gson.stream.JsonReader; |
| import com.google.gson.stream.JsonToken; |
| import com.google.gson.stream.JsonWriter; |
| |
| /** |
| * This class is added to support backward compatibility with table info object, where DATATYPE |
| * is string in old version(1.2) and OBJECT in new version(1.3) |
| */ |
| public class DataTypeAdapter extends TypeAdapter<Object> { |
| |
| private Gson fallBack_original = new Gson(); |
| |
| @Override |
| public void write(JsonWriter jsonWriter, Object o) { |
| } |
| |
| @Override |
| public Object read(JsonReader jsonReader) throws IOException { |
| JsonToken token = jsonReader.peek(); |
| if (token == JsonToken.STRING) { |
| return DataTypeUtil.valueOf(jsonReader.nextString()); |
| } else { |
| // use original deserializer logic |
| return fallBack_original.fromJson(jsonReader, DataType.class); |
| } |
| } |
| |
| } |