com.googlecode.jsfFlex.shared.util.JSONConverter.java Source code

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Here is the source code for com.googlecode.jsfFlex.shared.util.JSONConverter.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.googlecode.jsfFlex.shared.util;

import java.util.Calendar;
import java.util.Iterator;

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

/**
 * This class will provide methods of converting from JSONObject/JSONArray to <br>
 * other forms [i.e. XML in a form of String] and other forms to JSONObject [i.e. Calendar]<br>
 * 
 * @author Ji Hoon Kim
 */
public final class JSONConverter {

    private static final String XML_VALUE_START_TAG = "<VALUE>";
    private static final String XML_VALUE_END_TAG = "</VALUE>";

    private JSONConverter() {
        super();
    }

    @SuppressWarnings("unchecked")
    public static String convertJSONObjectToXMLString(JSONObject jsonObject) throws JSONException {

        StringBuilder converted = new StringBuilder();

        for (Iterator<String> keyIterator = jsonObject.keys(); keyIterator.hasNext();) {
            String currKey = keyIterator.next();
            Object value = jsonObject.get(currKey);
            converted.append("<" + currKey + ">");

            /*
             * And here comes the ugly instanceof checks
             */
            if (value instanceof JSONObject) {
                converted.append(convertJSONObjectToXMLString(JSONObject.class.cast(value)));
            } else if (value instanceof JSONArray) {
                converted.append(convertJSONArrayToXMLString(JSONArray.class.cast(value)));
            } else {
                converted.append(value.toString());
            }

            converted.append("</" + currKey + ">");
        }

        return converted.toString();
    }

    public static String convertJSONArrayToXMLString(JSONArray jsonArray) throws JSONException {

        StringBuilder converted = new StringBuilder();

        /*
         * TODO: 
         * Check out if better JSON.jar exists, since this one is outdated and doesn't even have an Iterator. 
         */
        for (int index = 0; index < jsonArray.length(); index++) {
            Object value = jsonArray.get(index);
            converted.append(XML_VALUE_START_TAG);
            /*
             * And here comes the ugly instanceof checks
             */
            if (value instanceof JSONObject) {
                converted.append(convertJSONObjectToXMLString(JSONObject.class.cast(value)));
            } else if (value instanceof JSONArray) {
                converted.append(convertJSONArrayToXMLString(JSONArray.class.cast(value)));
            } else {
                /*
                 * Should technically only contain JSONArray or JSONObject, b/c we are now using generic value XML tag
                 * and assuming this to be known.
                 */
                converted.append(value.toString());
            }

            converted.append(XML_VALUE_END_TAG);
        }

        return converted.toString();
    }

    public static JSONArray convertJavaDateToASDateConstructorArguments(Calendar toConvert) {
        JSONArray dateConstructorArguments = new JSONArray();

        dateConstructorArguments.put(toConvert.get(Calendar.YEAR));
        dateConstructorArguments.put(toConvert.get(Calendar.MONTH));
        dateConstructorArguments.put(toConvert.get(Calendar.DATE));
        dateConstructorArguments.put(toConvert.get(Calendar.HOUR_OF_DAY));
        dateConstructorArguments.put(toConvert.get(Calendar.MINUTE));
        dateConstructorArguments.put(toConvert.get(Calendar.SECOND));
        dateConstructorArguments.put(toConvert.get(Calendar.MILLISECOND));

        return dateConstructorArguments;
    }

}