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    • com.github.devswork.util.JSON4FastJSON Maven / Gradle / Ivy

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    package com.github.devswork.util;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.util.FieldInfo;
import com.alibaba.fastjson.util.TypeUtils;

import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

public class JSON4FastJSON {

    public static Object toJSON(Object javaObject) {

        ParserConfig mapping = ParserConfig.getGlobalInstance();

        if (javaObject == null) {
            return null;
        }

        if (javaObject instanceof JSON4FastJSON) {
            return javaObject;
        }

        if (javaObject instanceof Map) {
            Map map = (Map) javaObject;
            JSONObject json = null;
            if (javaObject instanceof LinkedHashMap) {
                json = new JSONObject(map.size(), true);
            } else {
                json = new JSONObject(map.size());
            }

            for (Map.Entry entry : map.entrySet()) {
                Object key = entry.getKey();
                String jsonKey = TypeUtils.castToString(key);
                Object jsonValue = toJSON(entry.getValue());
                json.put(jsonKey, jsonValue);
            }

            return json;
        }

        if (javaObject instanceof Collection) {
            Collection collection = (Collection) javaObject;

            JSONArray array = new JSONArray(collection.size());

            for (Object item : collection) {
                Object jsonValue = toJSON(item);
                array.add(jsonValue);
            }

            return array;
        }

        Class clazz = javaObject.getClass();

        if (clazz.isEnum()) {
            return ((Enum) javaObject).name();
        }

        if (clazz.isArray()) {
            int len = Array.getLength(javaObject);

            JSONArray array = new JSONArray(len);

            for (int i = 0; i < len; ++i) {
                Object item = Array.get(javaObject, i);
                Object jsonValue = toJSON(item);
                array.add(jsonValue);
            }

            return array;
        }

        if (mapping.isPrimitive(clazz)) {
            return javaObject;
        }

        try {
            List getters = TypeUtils.computeGetters(clazz, null);

            JSONObject json = new JSONObject(getters.size());

            for (FieldInfo field : getters) {
                Object value = field.get(javaObject);
                Object jsonValue = toJSON(value);

                json.put(field.name, jsonValue);
            }

            return json;
        } catch (IllegalAccessException e) {
            throw new JSONException("toJSON error", e);
        } catch (InvocationTargetException e) {
            throw new JSONException("toJSON error", e);
        }
    }

}
    
    
    
    

    




    
    
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