| /** |
| * 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.tajo.engine.json; |
| |
| import com.google.gson.Gson; |
| import com.google.gson.GsonBuilder; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.tajo.catalog.TableMeta; |
| import org.apache.tajo.catalog.json.FunctionAdapter; |
| import org.apache.tajo.catalog.json.TableMetaAdapter; |
| import org.apache.tajo.common.TajoDataTypes.DataType; |
| import org.apache.tajo.datum.Datum; |
| import org.apache.tajo.json.*; |
| import org.apache.tajo.plan.expr.EvalNode; |
| import org.apache.tajo.plan.function.AggFunction; |
| import org.apache.tajo.plan.function.GeneralFunction; |
| import org.apache.tajo.plan.logical.LogicalNode; |
| import org.apache.tajo.function.Function; |
| import org.apache.tajo.plan.serder.EvalNodeAdapter; |
| import org.apache.tajo.plan.serder.LogicalNodeAdapter; |
| import org.apache.tajo.util.TUtil; |
| |
| import java.lang.reflect.Type; |
| import java.util.Map; |
| import java.util.TimeZone; |
| |
| public class CoreGsonHelper { |
| private static Gson gson; |
| private static Gson gsonPretty; |
| |
| private CoreGsonHelper() { |
| } |
| |
| private static Map<Type, GsonSerDerAdapter> registerAdapters() { |
| Map<Type, GsonSerDerAdapter> adapters = TUtil.newHashMap(); |
| adapters.put(Path.class, new PathSerializer()); |
| adapters.put(Class.class, new ClassNameSerializer()); |
| adapters.put(LogicalNode.class, new LogicalNodeAdapter()); |
| adapters.put(EvalNode.class, new EvalNodeAdapter()); |
| adapters.put(TableMeta.class, new TableMetaAdapter()); |
| adapters.put(Function.class, new FunctionAdapter()); |
| adapters.put(GeneralFunction.class, new FunctionAdapter()); |
| adapters.put(AggFunction.class, new FunctionAdapter()); |
| adapters.put(Datum.class, new DatumAdapter()); |
| adapters.put(DataType.class, new DataTypeAdapter()); |
| adapters.put(TimeZone.class, new TimeZoneGsonSerdeAdapter()); |
| |
| return adapters; |
| } |
| |
| public static Gson getInstance() { |
| if (gson == null ) { |
| GsonHelper helper = new GsonHelper(registerAdapters()); |
| gson = helper.getGson(); |
| } |
| return gson; |
| } |
| |
| public static Gson getPrettyInstance() { |
| if (gsonPretty == null) { |
| GsonBuilder prettyBuilder = new GsonBuilder() |
| .setPrettyPrinting() |
| .excludeFieldsWithoutExposeAnnotation(); |
| GsonHelper.registerAdapters(prettyBuilder, registerAdapters()); |
| gsonPretty = prettyBuilder.create(); |
| } |
| |
| return gsonPretty; |
| } |
| |
| public static String toJson(GsonObject object, Class<? extends GsonObject> clazz) { |
| return getInstance().toJson(object, clazz); |
| } |
| |
| public static <T extends GsonObject> T fromJson(String json, Class<T> clazz) { |
| return getInstance().fromJson(json, clazz); |
| } |
| } |