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/**
* Copyright 2018 ZTE Corporation.
*
* Licensed 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.onap.holmes.common.utils;
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.JsonParseException;
import com.google.gson.reflect.TypeToken;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;
public class GsonUtil {
private static Gson gson = null;
static {
if (gson == null) {
gson = new GsonBuilder()
.registerTypeAdapter(Integer.class, new JsonDeserializer<Integer>() {
@Override
public Integer deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
try {
return json.getAsInt();
} catch (NumberFormatException e) {
return 0;
}
}
})
.create();
}
}
private GsonUtil() {
}
public static String beanToJson(Object object) {
String gsonString = null;
if (gson != null) {
gsonString = gson.toJson(object);
}
return gsonString;
}
public static <T> T jsonToBean(String gsonString, Class<T> cls) {
T t = null;
if (gson != null) {
t = gson.fromJson(gsonString, cls);
}
return t;
}
public static <T> List<T> GsonToList(String gsonString, Class<T> cls) {
List<T> list = null;
if (gson != null) {
list = gson.fromJson(gsonString, new TypeToken<List<T>>() {
}.getType());
}
return list;
}
public static <T> List<Map<String, T>> GsonToListMaps(String gsonString) {
List<Map<String, T>> list = null;
if (gson != null) {
list = gson.fromJson(gsonString,
new TypeToken<List<Map<String, T>>>() {
}.getType());
}
return list;
}
public static <T> Map<String, T> GsonToMaps(String gsonString) {
Map<String, T> map = null;
if (gson != null) {
map = gson.fromJson(gsonString, new TypeToken<Map<String, T>>() {
}.getType());
}
return map;
}
}
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