org.floggy.synchronization.jme.core.impl.JSONSerializationManager.java Source code

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Here is the source code for org.floggy.synchronization.jme.core.impl.JSONSerializationManager.java

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/**
 * Copyright (c) 2006-2010 Floggy Open Source Group. All rights reserved.
 *
 * 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.floggy.synchronization.jme.core.impl;

import java.util.Calendar;
import java.util.Date;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Stack;
import java.util.TimeZone;
import java.util.Vector;

import org.floggy.org.json.me.JSONArray;
import org.floggy.org.json.me.JSONException;
import org.floggy.org.json.me.JSONObject;
import org.floggy.org.json.me.JSONStringer;

import org.floggy.synchronization.jme.core.SynchronizationException;

import net.sourceforge.floggy.persistence.Persistable;

/**
* DOCUMENT ME!
*
* @author <a href="mailto:thiago.moreira@floggy.org">Thiago Moreira</a>
* @version $Revision$
 */
public class JSONSerializationManager {
    private JSONSerializationManager() {
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Boolean receiveBoolean(String name, JSONObject jsonObject) throws JSONException {

        Object value = jsonObject.opt(name);

        if (value != null) {
            return (((Boolean) value).booleanValue()) ? Boolean.TRUE : Boolean.FALSE;
        }

        return null;
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Byte receiveByte(String name, JSONObject jsonObject) throws JSONException {

        Object value = jsonObject.opt(name);

        if (value != null) {
            if (value instanceof Byte) {
                return ((Byte) value);
            } else if (value instanceof Integer) {
                return new Byte(((Integer) value).byteValue());
            }
        }

        return null;
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Calendar receiveCalendar(String name, JSONObject jsonObject) throws JSONException {
        Calendar value = null;
        JSONObject calendar = jsonObject.optJSONObject(name);

        if (calendar != null) {
            value = Calendar.getInstance();
            value.setTimeZone(TimeZone.getTimeZone(calendar.getJSONObject("timeZone").getString("ID")));
            value.setTime(new Date(calendar.getLong("time")));
        }

        return value;
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Character receiveChar(String name, JSONObject jsonObject) throws JSONException {
        String value = jsonObject.optString(name);

        if (value.length() != 0) {
            return new Character(value.charAt(0));
        }

        return null;
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Date receiveDate(String name, JSONObject jsonObject) throws JSONException {
        JSONObject temp = jsonObject.optJSONObject(name);

        if (temp != null) {
            return new Date(temp.getLong("time"));
        }

        return null;
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Double receiveDouble(String name, JSONObject jsonObject) throws JSONException {
        Object value = jsonObject.opt(name);

        if (value != null) {
            return (Double) value;
        }

        return null;
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Float receiveFloat(String name, JSONObject jsonObject) throws JSONException {
        float value = (float) jsonObject.getDouble(name);

        return new Float(value);
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Hashtable receiveHashtable(String name, JSONObject jsonObject) throws Exception {

        JSONArray array = jsonObject.optJSONArray(name);

        if (array != null) {
            Hashtable temp = new Hashtable();

            for (int i = 0; i < array.length(); i++) {
                JSONObject keyValuePair = array.optJSONObject(i);

                JSONObject jsonKey = keyValuePair.getJSONObject("key");
                JSONObject jsonValue = keyValuePair.optJSONObject("value");

                Object key = fromJSON(jsonKey);
                Object value = fromJSON(jsonValue);

                temp.put(key, value);
            }

            return temp;
        }

        return null;
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static int receiveInt(String name, JSONObject jsonObject) throws JSONException {
        return jsonObject.optInt(name);
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Integer receiveInteger(String name, JSONObject jsonObject) throws JSONException {
        Object value = jsonObject.opt(name);

        if (value != null) {
            if (value instanceof Integer) {
                return (Integer) value;
            }
        }

        return null;
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Long receiveLong(String name, JSONObject jsonObject) throws JSONException {
        Object value = jsonObject.opt(name);

        if (value != null) {
            if (value instanceof Long) {
                return (Long) value;
            }
        }

        return null;
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws Exception DOCUMENT ME!
    */
    public static final Object receiveObject(String name, JSONObject jsonObject) throws Exception {
        JSONObject value = jsonObject.optJSONObject(name);

        if (value != null) {
            return fromJSON(value);
        }

        return null;
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Persistable receivePersistable(String name, JSONObject jsonObject) throws JSONException {
        throw new JSONException("Not implemented!");
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Short receiveShort(String name, JSONObject jsonObject) throws JSONException {
        throw new JSONException("Not implemented!");
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Stack receiveStack(String name, JSONObject jsonObject) throws JSONException {
        throw new JSONException("Not implemented!");
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static StringBuffer receiveStringBuffer(String name, JSONObject jsonObject) throws JSONException {
        String value = jsonObject.getString(name);

        return new StringBuffer(value);
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static TimeZone receiveTimeZone(String name, JSONObject jsonObject) throws JSONException {
        String value = jsonObject.getString(name);

        return TimeZone.getTimeZone(value);
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param jsonObject DOCUMENT ME!
    *
    * @return DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static Vector receiveVector(String name, JSONObject jsonObject) throws JSONException {
        throw new JSONException("Not implemented!");
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static void send(String name, Object value, JSONStringer stringer) throws JSONException {
        if (value != null) {
            stringer.key(name).value(value);
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static void sendCalendar(String name, Calendar value, JSONStringer stringer) throws JSONException {
        if (value != null) {
            stringer.key(name);

            toJSON(value, stringer);
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static void sendDate(String name, Date value, JSONStringer stringer) throws JSONException {
        if (value != null) {
            stringer.key(name);

            toJSON(value, stringer);
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws Exception DOCUMENT ME!
    */
    public static void sendHashtable(String name, Hashtable value, JSONStringer stringer) throws Exception {
        if (value != null) {
            stringer.key(name);

            toJSON(value, stringer);
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws Exception DOCUMENT ME!
    * @throws SynchronizationException DOCUMENT ME!
    */
    public static final void sendObject(Object value, JSONStringer stringer) throws Exception {
        String className = value.getClass().getName();

        if (value instanceof Calendar) {
            className = "java.util.Calendar";
        } else if (value instanceof TimeZone) {
            className = "java.util.TimeZone";
        }

        stringer.object();

        stringer.key("className").value(className);
        stringer.key("value");

        if (value instanceof Boolean) {
            stringer.value(value);
        } else if (value instanceof Byte) {
            stringer.value(value);
        } else if (value instanceof Character) {
            stringer.value(value);
        } else if (value instanceof Double) {
            stringer.value(value);
        } else if (value instanceof Float) {
            stringer.value(value);
        } else if (value instanceof Hashtable) {
            Hashtable hashtable = (Hashtable) value;
            toJSON(hashtable, stringer);
        } else if (value instanceof Integer) {
            stringer.value(value);
        } else if (value instanceof Long) {
            stringer.value(value);
        } else if (value instanceof Short) {
            stringer.value(value);
        } else if (value instanceof Stack) {
            Stack stack = (Stack) value;
            toJSON(stack, stringer);
        } else if (value instanceof String) {
            stringer.value(value);
        } else if (value instanceof StringBuffer) {
            stringer.value(value);
        } else if (value instanceof Calendar) {
            Calendar calendar = (Calendar) value;
            toJSON(calendar, stringer);
        } else if (value instanceof Date) {
            Date date = (Date) value;
            toJSON(date, stringer);
        } else if (value instanceof TimeZone) {
            TimeZone timeZone = (TimeZone) value;
            toJSON(timeZone, stringer);
        } else if (value instanceof Vector) {
            Vector vector = (Vector) value;
            toJSON(vector, stringer);
        } else {
            throw new SynchronizationException("The class " + className + " doesn't is a persistable class!");
        }

        stringer.endObject();
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws Exception DOCUMENT ME!
    */
    public static void sendPersistable(String name, Persistable value, JSONStringer stringer) throws Exception {
        if (value != null) {
            stringer.key(name);

            toJSON(value, stringer);
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws Exception DOCUMENT ME!
    */
    public static void sendStack(String name, Stack value, JSONStringer stringer) throws Exception {
        if (value != null) {
            stringer.key(name);

            toJSON(value, stringer);
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static void sendTimeZone(String name, TimeZone value, JSONStringer stringer) throws JSONException {
        if (value != null) {
            stringer.key(name);

            toJSON(value, stringer);
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param name DOCUMENT ME!
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws Exception DOCUMENT ME!
    */
    public static void sendVector(String name, Vector value, JSONStringer stringer) throws Exception {
        if (value != null) {
            stringer.key(name);

            toJSON(value, stringer);
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static void toJSON(Calendar value, JSONStringer stringer) throws JSONException {
        if (value == null) {
            stringer.value(null);
        } else {
            stringer.object();
            stringer.key("timeZone");
            toJSON(value.getTimeZone(), stringer);
            stringer.key("time").value(value.getTime().getTime());
            stringer.endObject();
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static void toJSON(Date value, JSONStringer stringer) throws JSONException {
        if (value == null) {
            stringer.value(null);
        } else {
            stringer.object();
            stringer.key("time").value(value.getTime());
            stringer.endObject();
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws Exception DOCUMENT ME!
    */
    public static void toJSON(Hashtable value, JSONStringer stringer) throws Exception {
        if (value == null) {
            stringer.value(null);
        } else {
            stringer.array();

            Enumeration keys = value.keys();

            while (keys.hasMoreElements()) {
                Object key = keys.nextElement();

                stringer.object();
                stringer.key("key");

                sendObject(key, stringer);

                stringer.key("value");

                sendObject(value.get(key), stringer);

                stringer.endObject();
            }

            stringer.endArray();
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws Exception DOCUMENT ME!
    */
    public static void toJSON(Persistable value, JSONStringer stringer) throws Exception {
        if (value == null) {
            stringer.value(null);
        } else {
            stringer.object();

            stringer.key("className");
            stringer.value(value.getClass().getName());

            stringer.endObject();
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws Exception DOCUMENT ME!
    */
    public static void toJSON(Stack value, JSONStringer stringer) throws Exception {
        if (value == null) {
            stringer.value(null);
        } else {
            stringer.array();

            Enumeration elements = value.elements();

            while (elements.hasMoreElements()) {
                Object object = elements.nextElement();
                sendObject(object, stringer);
            }

            stringer.endArray();
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws JSONException DOCUMENT ME!
    */
    public static void toJSON(TimeZone value, JSONStringer stringer) throws JSONException {
        if (value == null) {
            stringer.value(null);
        } else {
            stringer.object();
            stringer.key("ID").value(value.getID());
            stringer.endObject();
        }
    }

    /**
    * DOCUMENT ME!
    *
    * @param value DOCUMENT ME!
    * @param stringer DOCUMENT ME!
    *
    * @throws Exception DOCUMENT ME!
    */
    public static void toJSON(Vector value, JSONStringer stringer) throws Exception {
        if (value == null) {
            stringer.value(null);
        } else {
            stringer.array();

            Enumeration elements = value.elements();

            while (elements.hasMoreElements()) {
                Object object = elements.nextElement();
                sendObject(object, stringer);
            }

            stringer.endArray();
        }
    }

    protected static Object fromJSON(JSONObject jsonObject) throws Exception {
        String className = jsonObject.getString("className");

        if (className.equals("java.lang.String")) {
            return jsonObject.getString("value");
        } else if (className.equals("java.lang.Byte")) {
            return new Byte((byte) jsonObject.getInt("value"));
        } else {
            throw new SynchronizationException(className + " not supported!");
        }
    }
}