001/*
002 * This library is part of OpenCms -
003 * the Open Source Content Management System
004 *
005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * For further information about Alkacon Software, please see the
018 * company website: http://www.alkacon.com
019 *
020 * For further information about OpenCms, please see the
021 * project website: http://www.opencms.org
022 *
023 * You should have received a copy of the GNU Lesser General Public
024 * License along with this library; if not, write to the Free Software
025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
026 */
027
028package org.opencms.ugc.client;
029
030import java.util.HashMap;
031import java.util.Map;
032import java.util.Random;
033
034import com.google.gwt.core.client.JavaScriptObject;
035import com.google.gwt.json.client.JSONObject;
036import com.google.gwt.json.client.JSONString;
037
038/**
039 * Various utility functions.<p>
040 */
041public class CmsJsUtils {
042
043    /** The random number generator. */
044    public static final Random RANDOM = new Random();
045
046    /**
047     * Converts a Javascript object to a map from strings to strings, ignoring all properties
048     * of the object whose value is not a string.<p>
049     *
050     * @param jso the Javascript object to convert
051     * @return the map containing the string-valued properties of the Javascript object
052     */
053    public static Map<String, String> convertJsObjectToMap(JavaScriptObject jso) {
054
055        Map<String, String> result = new HashMap<String, String>();
056        JSONObject json = new JSONObject(jso);
057        for (String key : json.keySet()) {
058            if ((json.get(key) != null) && (json.get(key).isString() != null)) {
059                result.put(key, json.get(key).isString().stringValue());
060            } else {
061                result.put(key, null);
062            }
063        }
064        return result;
065    }
066
067    /**
068     * Converts a map whose keys and values are strings to a Javascript object with the keys as attributes and the
069     * corresponding values as the attribute values.<p>
070     *
071     * @param stringMap the map to convert
072     * @return the Javascript object with the attributes defined by the map
073     */
074    public static JavaScriptObject convertMapToJsObject(Map<String, String> stringMap) {
075
076        if (stringMap == null) {
077            return null;
078        }
079        JSONObject json = new JSONObject();
080        for (Map.Entry<String, String> entry : stringMap.entrySet()) {
081            String key = entry.getKey();
082            String value = entry.getValue();
083            json.put(key, new JSONString(value));
084        }
085        return json.getJavaScriptObject();
086    }
087
088    /**
089     * Generates a random id.<p>
090     *
091     * @return the random id
092     */
093    public static String generateRandomId() {
094
095        StringBuffer buffer = new StringBuffer();
096        int base = 36;
097        for (int i = 0; i < 16; i++) {
098            buffer.append(Integer.toString(RANDOM.nextInt(base), base));
099        }
100        return buffer.toString();
101    }
102
103}