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A general programming library in Java
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/*
 * Copyright (c) 2015, Haiyang Li.
 * 
 * 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 com.landawn.abacus.util;

import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

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

import com.landawn.abacus.parser.ParserUtil;
import com.landawn.abacus.parser.ParserUtil.EntityInfo;
import com.landawn.abacus.parser.ParserUtil.PropInfo;
import com.landawn.abacus.type.Type;

/**
 * 
 * @since 0.8
 * 
 * @author Haiyang Li
 */
public final class JSONUtil {

    private JSONUtil() {
        // singleton.
    }

    public static JSONObject wrap(final Map map) {
        return new JSONObject(map);
    }

    /**
     * wrap(entity) -> wrap(Maps.deepEntity2Map(entity, true))
     * 
     * @param entity
     * @return
     * @see Maps#deepEntity2Map(Object)
     */
    @SuppressWarnings("unchecked")
    public static JSONObject wrap(final Object entity) {
        return new JSONObject(entity instanceof Map ? (Map) entity : Maps.deepEntity2Map(entity, true));
    }

    public static JSONArray wrap(final boolean[] array) throws JSONException {
        return new JSONArray(array);
    }

    public static JSONArray wrap(final char[] array) throws JSONException {
        return new JSONArray(array);
    }

    public static JSONArray wrap(final byte[] array) throws JSONException {
        return new JSONArray(array);
    }

    public static JSONArray wrap(final short[] array) throws JSONException {
        return new JSONArray(array);
    }

    public static JSONArray wrap(final int[] array) throws JSONException {
        return new JSONArray(array);
    }

    public static JSONArray wrap(final long[] array) throws JSONException {
        return new JSONArray(array);
    }

    public static JSONArray wrap(final float[] array) throws JSONException {
        return new JSONArray(array);
    }

    public static JSONArray wrap(final double[] array) throws JSONException {
        return new JSONArray(array);
    }

    public static JSONArray wrap(final Object[] array) throws JSONException {
        return new JSONArray(array);
    }

    public static JSONArray wrap(final Collection coll) {
        return new JSONArray(coll);
    }

    public static Map unwrap(final JSONObject jsonObject) throws JSONException {
        return unwrap(Map.class, jsonObject);
    }

    public static  T unwrap(final Class cls, final JSONObject jsonObject) throws JSONException {
        return unwrap(N. typeOf(cls), jsonObject);
    }

    @SuppressWarnings("unchecked")
    public static  T unwrap(Type type, final JSONObject jsonObject) throws JSONException {
        type = type.clazz().equals(Object.class) ? N. typeOf("Map") : type;
        final Class cls = type.clazz();

        if (type.clazz().isAssignableFrom(JSONObject.class)) {
            return (T) jsonObject;
        } else if (type.isMap()) {
            final Map map = (Map) N.newInstance(cls);
            final Iterator iter = jsonObject.keys();
            final Type valueType = type.getParameterTypes()[1];
            String key = null;
            Object value = null;

            while (iter.hasNext()) {
                key = iter.next();
                value = jsonObject.get(key);

                if (value == JSONObject.NULL) {
                    value = null;
                } else if (value != null) {
                    if (value instanceof JSONObject) {
                        value = unwrap(valueType, (JSONObject) value);
                    } else if (value instanceof JSONArray) {
                        value = unwrap(valueType, (JSONArray) value);
                    }
                }

                map.put(key, value);
            }

            return (T) map;
        } else {
            final Object entity = N.newEntity(cls, null);
            final EntityInfo entityInfo = ParserUtil.getEntityInfo(cls);
            final Iterator iter = jsonObject.keys();
            String key = null;
            Object value = null;
            PropInfo propInfo = null;

            while (iter.hasNext()) {
                key = iter.next();
                value = jsonObject.get(key);

                propInfo = entityInfo.getPropInfo(key);
                value = jsonObject.get(key);

                if (value == JSONObject.NULL) {
                    value = null;
                } else if (value != null) {
                    if (value instanceof JSONObject) {
                        value = unwrap(propInfo.type, (JSONObject) value);
                    } else if (value instanceof JSONArray) {
                        value = unwrap(propInfo.type, (JSONArray) value);
                    }
                }

                propInfo.setPropValue(entity, value);
            }

            return (T) entity;
        }
    }

    public static  List unwrap(final JSONArray jsonArray) throws JSONException {
        return unwrap(List.class, jsonArray);
    }

    /**
     * 
     * @param cls
     *            array or collection class
     * @param jsonArray
     * @return
     */
    public static  T unwrap(final Class cls, final JSONArray jsonArray) throws JSONException {
        return unwrap(N. typeOf(cls), jsonArray);
    }

    @SuppressWarnings("unchecked")
    public static  T unwrap(Type type, final JSONArray jsonArray) throws JSONException {
        type = type.clazz().equals(Object.class) ? N. typeOf("List