org.dromara.hutool.json.engine.GsonEngine Maven / Gradle / Ivy
/*
* Copyright (c) 2013-2024 Hutool Team and hutool.cn
*
* 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.dromara.hutool.json.engine;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import org.dromara.hutool.core.lang.Assert;
import org.dromara.hutool.core.util.ObjUtil;
import org.dromara.hutool.json.JSONException;
import java.io.Reader;
import java.io.Writer;
import java.lang.reflect.Type;
/**
* Gson引擎实现
*
* @author Looly
* @since 6.0.0
*/
public class GsonEngine extends AbstractJSONEngine{
private Gson gson;
/**
* 构造
*/
public GsonEngine() {
// issue#IABWBL JDK8下,在IDEA旗舰版加载Spring boot插件时,启动应用不会检查字段类是否存在
// 此处构造时调用下这个类,以便触发类是否存在的检查
Assert.notNull(Gson.class);
}
@Override
public void serialize(final Object bean, final Writer writer) {
initEngine();
gson.toJson(bean, writer);
}
@SuppressWarnings("unchecked")
@Override
public T deserialize(final Reader reader, final Object type) {
initEngine();
if(type instanceof Class){
return gson.fromJson(reader, (Class)type);
} else if(type instanceof Type){
return gson.fromJson(reader, (Type)type);
}
throw new JSONException("Unsupported type: {}", type.getClass());
}
@Override
protected void reset() {
this.gson = null;
}
@Override
protected void initEngine() {
if(null != this.gson){
return;
}
final GsonBuilder builder = new GsonBuilder();
if(ObjUtil.defaultIfNull(this.config, JSONEngineConfig::isPrettyPrint, false)){
builder.setPrettyPrinting();
}
this.gson = builder.create();
}
}