001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2020, by Object Refinery Limited and Contributors.
006 *
007 * Project Info:  http://www.jfree.org/jfreechart/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
022 * USA.
023 *
024 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
025 * Other names may be trademarks of their respective owners.]
026 *
027 * -----------------
028 * URLUtilities.java
029 * -----------------
030 * (C) Copyright 2007, 2008, by Object Refinery Limited.
031 *
032 * Original Author:  David Gilbert (for Object Refinery Limited);
033 * Contributors:     -;
034 *
035 */
036
037package org.jfree.chart.urls;
038
039import java.lang.reflect.InvocationTargetException;
040import java.lang.reflect.Method;
041import java.net.URLEncoder;
042
043/**
044 * General utility methods for URLs.
045 *
046 * @since 1.0.6
047 */
048public class URLUtilities {
049
050    /** Constant used by {@link #encode(String, String)}. */
051    private static final Class[] STRING_ARGS_2 = new Class[] {String.class,
052            String.class};
053
054    /**
055     * Calls {@code java.net.URLEncoder.encode(String, String)} via
056     * reflection, if we are running on JRE 1.4 or later, otherwise reverts to
057     * the deprecated {@code URLEncoder.encode(String)} method.
058     *
059     * @param s  the string to encode.
060     * @param encoding  the encoding.
061     *
062     * @return The encoded string.
063     *
064     * @since 1.0.6
065     */
066    public static String encode(String s, String encoding) {
067        Class c = URLEncoder.class;
068        String result = null;
069        try {
070            Method m = c.getDeclaredMethod("encode", STRING_ARGS_2);
071            try {
072                result = (String) m.invoke(null, new Object[] {s, encoding});
073            }
074            catch (InvocationTargetException e) {
075                e.printStackTrace();
076            }
077            catch (IllegalAccessException e) {
078                e.printStackTrace();
079            }
080        }
081        catch (NoSuchMethodException e) {
082            // we're running on JRE 1.3.1 so this is the best we have...
083            result = URLEncoder.encode(s);
084        }
085        return result;
086    }
087
088}