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/**
* Copyright 2018-2021 ZTE Corporation.
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.*;
import com.google.gson.reflect.TypeToken;
import org.apache.commons.lang3.StringUtils;
import java.util.Date;
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, (JsonDeserializer<Integer>) (json, typeOfT, context) -> {
try {
return json.getAsInt();
} catch (NumberFormatException e) {
return 0;
}
})
.registerTypeAdapter(Date.class, (JsonDeserializer<Date>) (jsonElement, type, jsonDeserializationContext) -> {
try {
return jsonElement == null ? null : new Date(jsonElement.getAsLong());
} catch (NumberFormatException e) {
return null;
}
})
.registerTypeAdapter(Date.class, (JsonSerializer<Date>) (date, type, jsonSerializationContext)
-> date == null ? null : new JsonPrimitive(date.getTime()))
.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> jsonToList(String gsonString, Class<T> cls) {
List<T> list = null;
if (gson != null) {
list = gson.fromJson(gsonString, TypeToken.getParameterized(List.class, cls).getType());
}
return list;
}
public static <T> List<Map<String, T>> jsonToListMaps(String gsonString, Class<T> cls) {
List<Map<String, T>> list = null;
if (gson != null) {
list = gson.fromJson(gsonString,
TypeToken.getParameterized(List.class,
TypeToken.getParameterized(Map.class, String.class, cls).getType()
).getType()
);
}
return list;
}
public static <T> Map<String, T> jsonToMap(String gsonString, Class<T> cls) {
Map<String, T> map = null;
if (gson != null) {
map = gson.fromJson(gsonString, TypeToken.getParameterized(Map.class, String.class, cls).getType());
}
return map;
}
public static String getAsString(JsonObject o, String field) {
String ret = null;
if (field == null) {
field = StringUtils.EMPTY;
}
if (o.has(field) && !o.get(field).isJsonNull()) {
ret = o.get(field).getAsString();
}
return ret;
}
public static long getAsLong(JsonObject o, String field) {
long ret = 0;
if (field == null) {
field = StringUtils.EMPTY;
}
if (o.has(field) && !o.get(field).isJsonNull()) {
ret = o.get(field).getAsLong();
}
return ret;
}
public static int getAsInt(JsonObject o, String field) {
int ret = 0;
if (field == null) {
field = StringUtils.EMPTY;
}
if (o.has(field) && !o.get(field).isJsonNull()) {
ret = o.get(field).getAsInt();
}
return ret;
}
}
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