Dépôt officiel du code source de l'ERP OpenConcerto

/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved.

 *

 * The contents of this file are subject to the terms of the GNU General Public License Version 3

 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a

 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific

 * language governing permissions and limitations under the License.

 *

 * When distributing the software, include this License Header Notice in each file.

 */

 package org.openconcerto.utils.io;

import org.openconcerto.utils.NumberUtils;

import org.openconcerto.utils.XMLDateFormat;

import java.awt.Color;

import java.math.BigDecimal;

import java.math.BigInteger;

import java.text.Format;

import java.util.Calendar;

import java.util.Date;

import com.google.gson.Gson;

import com.google.gson.JsonElement;

import com.google.gson.reflect.TypeToken;

import net.minidev.json.JSONArray;

import net.minidev.json.JSONObject;

import net.minidev.json.parser.JSONParser;

import net.minidev.json.parser.ParseException;

public class JSONConverter {

    // type-safe methods

    public static final <T> T fromJson(final Gson gson, String json, TypeToken<T> typeOfT) {

        return gson.fromJson(json, typeOfT.getType());

    }

    public static final <T> T fromJson(final Gson gson, JsonElement json, TypeToken<T> typeOfT) {

        return gson.fromJson(json, typeOfT.getType());

    }

    // ** net.minidev.json

    static private final Format DF = new XMLDateFormat();

    static synchronized private final String format(final Date d) {

        return DF.format(d);

    }

    public synchronized static String formatCalendar(final Calendar calendar) {

        return DF.format(calendar);

    }

    static synchronized private final Date parse(final String s) throws java.text.ParseException {

        return (Date) DF.parseObject(s);

    }

    public static Object getJSON(Object param) {

        Object result = null;

        if (param != null) {

            if (param instanceof HTMLable) {

                result = ((HTMLable) param).getHTML();

            } else if (param instanceof JSONAble) {

                result = ((JSONAble) param).toJSON();

            } else if (param instanceof Date) {

                result = format((Date) param);

            } else if (param instanceof Calendar) {

                result = formatCalendar(((Calendar) param));

            } else if (param instanceof Class<?>) {

                result = ((Class<?>) param).getName();

            } else if (param instanceof Iterable) {

                final Iterable<?> tmp = (Iterable<?>) param;

                final JSONArray jsonArray = new JSONArray();

                for (Object o : tmp) {

                    jsonArray.add(getJSON(o));

                }

                result = jsonArray;

            } else if (param instanceof Color) {

                if (param != null) {

                    final Color paramColor = (Color) param;

                    final JSONObject jsonColor = new JSONObject();

                    jsonColor.put("r", paramColor.getRed());

                    jsonColor.put("g", paramColor.getGreen());

                    jsonColor.put("b", paramColor.getBlue());

                    result = jsonColor;

                }

            } else if (param instanceof BigDecimal) {

                result = ((BigDecimal) param).doubleValue();

            } else {

                result = param;

            }

        }

        return result;

    }

    public static <T> T getObjectFromJSON(final Object o, final Class<T> type) {

        final T result;

        if (o != null && !o.equals("null")) {

            if (type.isInstance(o)) {

                result = type.cast(o);

            } else if (type.equals(Integer.class)) {

                final int intVal;

                if (o instanceof BigDecimal) {

                    intVal = ((BigDecimal) o).intValueExact();

                } else if (o instanceof BigInteger) {

                    // TODO use intValueExact() in Java 8

                    final BigInteger bigInt = (BigInteger) o;

                    if (bigInt.compareTo(BigInteger.valueOf(Integer.MIN_VALUE)) < 0 || bigInt.compareTo(BigInteger.valueOf(Integer.MAX_VALUE)) > 0)

                        throw new IllegalArgumentException("object (" + o.getClass().getName() + ") is not assignable for '" + type + "'");

                    intVal = bigInt.intValue();

                } else {

                    try {

                        intVal = NumberUtils.ensureInt((Long) o);

                    } catch (ArithmeticException ex) {

                        throw new IllegalArgumentException("object (" + o.getClass().getName() + ") is not assignable for '" + type + "'", ex);

                    }

                }

                result = type.cast(intVal);

            } else if (type.equals(Date.class)) {

                final String sparam = (String) o;

                try {

                    final Date c = parse(sparam);

                    result = type.cast(c);

                } catch (java.text.ParseException e) {

                    throw new IllegalArgumentException("object (" + o.getClass().getName() + ") is not assignable for '" + type + "', the format is not valid", e);

                }

            } else if (type.equals(Color.class)) {

                final JSONObject jsonColor = (JSONObject) o;

                final int r = JSONConverter.getParameterFromJSON(jsonColor, "r", Integer.class);

                final int g = JSONConverter.getParameterFromJSON(jsonColor, "g", Integer.class);

                final int b = JSONConverter.getParameterFromJSON(jsonColor, "b", Integer.class);

                result = type.cast(new Color(r, g, b));

            } else {

                result = type.cast(o);

            }

        } else {

            result = null;

        }

        return result;

    }

    public static <T> T getParameterFromJSON(final JSONObject json, final String key, final Class<T> type) {

        return getParameterFromJSON(json, key, type, null);

    }

    public static <T> T getParameterFromJSON(final JSONObject json, final String key, final Class<T> type, T defaultValue) {

        return json.containsKey(key) ? getObjectFromJSON(json.get(key), type) : defaultValue;

    }

    public static JSONObject convertStringToJsonObject(final String jsonString) {

        final JSONParser parser = new JSONParser(JSONParser.USE_HI_PRECISION_FLOAT);

        final JSONObject json;

        try {

            json = (JSONObject) parser.parse(jsonString);

        } catch (final ParseException ex) {

            throw new IllegalArgumentException(ex.getMessage(), ex);

        }

        return json;

    }

    public static JSONArray convertStringToJsonArray(final String jsonString) {

        final JSONParser parser = new JSONParser(JSONParser.USE_HI_PRECISION_FLOAT);

        final JSONArray json;

        try {

            json = (JSONArray) parser.parse(jsonString);

        } catch (final ParseException ex) {

            throw new IllegalArgumentException(ex.getMessage(), ex);

        }

        return json;

    }

}