// 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 com.cloud.ovm.object;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.reflect.TypeToken;
public class Coder {
private static Gson s_gson;
private static Gson s_mapGson;
public static Object[] s_emptyParams = new Object[0];
private static class MapDecoder implements JsonDeserializer<Map<String, String>> {
@Override
public Map<String, String> deserialize(JsonElement arg0, Type arg1, JsonDeserializationContext arg2) throws JsonParseException {
if (!arg0.isJsonObject()) {
throw new JsonParseException(arg0.toString() + " is not Json Object, cannot convert to map");
}
JsonObject objs = arg0.getAsJsonObject();
Map<String, String> map = new HashMap<String, String>();
for (Entry<String, JsonElement> e : objs.entrySet()) {
if (!e.getValue().isJsonPrimitive()) {
throw new JsonParseException(e.getValue().toString() + " is not a Json primitive," + arg0 + " can not convert to map");
}
map.put(e.getKey(), e.getValue().getAsString());
}
return map;
}
}
static {
GsonBuilder _builder = new GsonBuilder();
_builder.registerTypeAdapter(Map.class, new MapDecoder());
s_mapGson = _builder.create();
s_gson = new Gson();
}
public static String toJson(Object obj) {
return s_gson.toJson(obj);
}
public static <T> T fromJson(String str, Class<T> clz) {
return s_gson.fromJson(str, clz);
}
@SuppressWarnings("unchecked")
public static Map<String, String> mapFromJson(String str) {
return s_mapGson.fromJson(str, Map.class);
}
public static List<String> listFromJson(String str) {
Type listType = new TypeToken<List<String>>() {
}.getType();
return s_gson.fromJson(str, listType);
}
}