sts-saguenay-android/luticateutils/src/main/java/com/luticate/utils/dbo/LuDbo.java

package com.luticate.utils.dbo;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.AbstractMap;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.Vector;

/**
 * Created by robin on 11/27/15.
 */
public abstract class LuDbo {

    public void fromString(String data) throws Exception
    {
        JSONObject json = new JSONObject(data);
        fromJson(json);
    }

    public String getFieldFromJson(String jsonName)
    {
        if (!jsonName.startsWith("_")) {
            return String.format("_%s", jsonName);
        }
        return jsonName;
    }

    public String getJsonFromField(String fieldName)
    {
        if (fieldName.startsWith("_")) {
            return fieldName.substring(1);
        }
        return fieldName;
    }

    public Object getObjectFromJson(Class clazz, JSONObject json, String key) throws Exception {
        if (json.isNull(key)) {
            return null;
        }

        if (clazz == Byte.class || clazz == byte.class) {
            return (byte) json.getInt(key);
        }
        if (clazz == Character.class || clazz == char.class) {
            return json.getString(key).charAt(0);
        }
        if (clazz == Short.class || clazz == short.class) {
            return (short) json.getInt(key);
        }
        if (clazz == Integer.class || clazz == int.class) {
            return json.getInt(key);
        }
        if (clazz == Long.class || clazz == long.class) {
            return json.getLong(key);
        }
        if (clazz == Float.class || clazz == float.class) {
            return (float) json.getDouble(key);
        }
        if (clazz == Double.class || clazz == double.class) {
            return json.getDouble(key);
        }
        if (clazz == Boolean.class || clazz == boolean.class) {
            return json.getBoolean(key);
        }
        if (clazz == String.class) {
            return json.getString(key);
        }
        if (LuDbo.class.isAssignableFrom(clazz)) {
            LuDbo dbo = (LuDbo) getInstance(clazz);
            dbo.fromJson(json.getJSONObject(key));
            return dbo;
        }
        return null;
    }

    public Object getObjectFromJson(Class clazz, JSONArray json, int key) throws Exception {
        if (json.isNull(key)) {
            return null;
        }

        if (clazz == Byte.class || clazz == byte.class) {
            return (byte) json.getInt(key);
        }
        if (clazz == Character.class || clazz == char.class) {
            return json.getString(key).charAt(0);
        }
        if (clazz == Short.class || clazz == short.class) {
            return (short) json.getInt(key);
        }
        if (clazz == Integer.class || clazz == int.class) {
            return json.getInt(key);
        }
        if (clazz == Long.class || clazz == long.class) {
            return json.getLong(key);
        }
        if (clazz == Float.class || clazz == float.class) {
            return (float) json.getDouble(key);
        }
        if (clazz == Double.class || clazz == double.class) {
            return json.getDouble(key);
        }
        if (clazz == Boolean.class || clazz == boolean.class) {
            return json.getBoolean(key);
        }
        if (clazz == String.class) {
            return json.getString(key);
        }
        if (LuDbo.class.isAssignableFrom(clazz)) {
            LuDbo dbo = (LuDbo) getInstance(clazz);
            dbo.fromJson(json.getJSONObject(key));
            return dbo;
        }
        return null;
    }

    public Object getInstance(Class clazz) throws Exception {
        if (clazz == List.class) {
            return new Vector<>();
        }
        if (clazz == AbstractMap.class) {
            return new HashMap<>();
        }
        return clazz.newInstance();
    }

    public void fromJson(JSONObject json) throws Exception
    {
        for (Field field : getClass().getDeclaredFields()) {
            String key = getJsonFromField(field.getName());
            Class clazz = field.getType();
            Object value = null;
            if (json.has(key)) {
                if (List.class.isAssignableFrom(clazz)) {
                    ParameterizedType parameterizedType = (ParameterizedType) field.getGenericType();
                    Class type = (Class) parameterizedType.getActualTypeArguments()[0];
                    List<Object> list = (List<Object>) getInstance(clazz);
                    JSONArray jsonArray = json.getJSONArray(key);
                    for (int i = 0; i < jsonArray.length(); ++i) {
                        list.add(getObjectFromJson(type, jsonArray, i));
                    }
                    value = list;
                }
                else if (clazz.isArray()) {
                    Class type = clazz.getComponentType();
                    JSONArray jsonArray = json.getJSONArray(key);
                    Object array = Array.newInstance(type, jsonArray.length());
                    for (int i = 0; i < jsonArray.length(); ++i) {
                        Array.set(array, i, getObjectFromJson(type, jsonArray, i));
                    }
                    value = array;
                }
                else if (AbstractMap.class.isAssignableFrom(clazz)) {
                    ParameterizedType parameterizedType = (ParameterizedType) field.getGenericType();
                    Class type = (Class) parameterizedType.getActualTypeArguments()[0];
                    if (type == String.class) {
                        type = (Class) parameterizedType.getActualTypeArguments()[1];
                        AbstractMap<String, Object> map = (AbstractMap<String, Object>) getInstance(clazz);
                        JSONObject obj = json.getJSONObject(key);
                        Iterator<String> it = obj.keys();
                        while (it.hasNext()) {
                            String k = it.next();
                            map.put(k, getObjectFromJson(type, obj, k));
                        }
                        value = map;
                    }
                }
                else {
                    value = getObjectFromJson(clazz, json, key);
                }
            }
            field.setAccessible(true);
            field.set(this, value);
            field.setAccessible(false);
        }
    }

    public HashMap<String, Object> toArray()
    {
        HashMap<String, Object> map = new HashMap<>();

        for (Field field : getClass().getDeclaredFields()) {
            String key = getJsonFromField(field.getName());
            Class clazz = field.getType();
        }

        return map;
    }

    public JSONObject toJson()
    {
        return new JSONObject(toArray());
    }

    @Override
    public String toString()
    {
        return toJson().toString();
    }
}