/* * Copyright (c) 2001-2007 Sun Microsystems, Inc.  All rights reserved. *   *  The Sun Project JXTA(TM) Software License *   *  Redistribution and use in source and binary forms, with or without  *  modification, are permitted provided that the following conditions are met: *   *  1. Redistributions of source code must retain the above copyright notice, *     this list of conditions and the following disclaimer. *   *  2. Redistributions in binary form must reproduce the above copyright notice,  *     this list of conditions and the following disclaimer in the documentation  *     and/or other materials provided with the distribution. *   *  3. The end-user documentation included with the redistribution, if any, must  *     include the following acknowledgment: "This product includes software  *     developed by Sun Microsystems, Inc. for JXTA(TM) technology."  *     Alternately, this acknowledgment may appear in the software itself, if  *     and wherever such third-party acknowledgments normally appear. *   *  4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must  *     not be used to endorse or promote products derived from this software  *     without prior written permission. For written permission, please contact  *     Project JXTA at http://www.jxta.org. *   *  5. Products derived from this software may not be called "JXTA", nor may  *     "JXTA" appear in their name, without prior written permission of Sun. *   *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, *  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND  *  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SUN  *  MICROSYSTEMS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,  *  OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,  *  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *   *  JXTA is a registered trademark of Sun Microsystems, Inc. in the United  *  States and other countries. *   *  Please see the license information page at : *  <http://www.jxta.org/project/www/license.html> for instructions on use of  *  the license in source files. *   *  ==================================================================== *   *  This software consists of voluntary contributions made by many individuals  *  on behalf of Project JXTA. For more information on Project JXTA, please see  *  http://www.jxta.org. *   *  This license is based on the BSD license adopted by the Apache Foundation.  */package sun.net.www.protocol.urn;import java.net.URL;import java.net.URLConnection;import java.net.URLStreamHandler;import java.io.IOException;/** * Handler for URN * * @deprecated Use the URI interfaces for JXTA IDs instead of the URLs. */@Deprecatedpublic final class Handler extends URLStreamHandler {        public static Handler handler = new Handler();        /**     * Creates new Handler     **/    public Handler() {}        /**     *     **/    @Override    public URLConnection openConnection(URL connect) throws                IOException {        return null;    }        /**     *     *  Private replacement for toHexString since we need the leading 0 digits.     *  Returns a String containing byte value encoded as 2 hex characters.     *     *  @param  theByte a byte containing the value to be encoded.     *  @return	String containing byte value encoded as 2 hex characters.     */    private static String toHexDigits(byte theByte) {        final char[] HEXDIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };        StringBuilder result = new StringBuilder(2);                result.append(HEXDIGITS[(theByte >>> 4) & 15]);        result.append(HEXDIGITS[theByte & 15]);                return result.toString();    }        /**     *     * 2.4 of RFC2141 says we have to encode these chars.     *     **/    static final String needsEncoding = "%/?#" + "\\\"&<>[]^`{|}~";        /**     *     * The byte values of the chars we have to encode.     *     **/    static final byte[] encodesTo = new byte[] {        0x25, 0x2F, 0x3F, 0x23, 0x5c, 0x22, 0x26, 0x3C, 0x3E, 0x5B, 0x5D, 0x5E, 0x60, 0x7B, 0x7C, 0x7D, 0x7E    };        /**     *  Encode a string such that it is in a form acceptable for presentation     *  as a URN. First the string is encoded as UTF8 so that any high byte     *  unicode chars are ascii representable. Then any special characters in     *  the string are escaped using the URN % syntax.     *     *  @param source   the string to encode     *  @return String containing the URN acceptable presentation form.     **/    public static String encodeURN(String source) {        String asISO8559_1 = null;                try {            // first we get its bytes using UTF to encode its characters.            byte[] asBytes = source.getBytes("UTF8");                        // then read it back in as ISO-8859-1. This allows us to see the            // bytes with no translation. This string will have chars in the            // range 0-255 only.            asISO8559_1 = new String(asBytes, "ISO-8859-1");        } catch (java.io.UnsupportedEncodingException never) {            // these 2 encodings are required by all java implementations            // so this exception will never happen.            ;        }                StringBuilder result = new StringBuilder(asISO8559_1.length());                // now do the % encoding for all chars which need it.        for (int eachChar = 0; eachChar < asISO8559_1.length(); eachChar++) {            char aChar = asISO8559_1.charAt(eachChar);                        // null char is bad            if (0 == aChar) {                throw new IllegalArgumentException("URN string cannot contain null char");            }                        // in the excluded range            if ((aChar <= 32) || (aChar >= 127)) {                result.append('%');                result.append(toHexDigits((byte) aChar));            } else {                int inSpecials = needsEncoding.indexOf(aChar);                                // one of the special chars which must be encoded?                if (-1 != inSpecials) {                    result.append('%');                    result.append(toHexDigits(encodesTo[inSpecials]));                } else {                    result.append(aChar);                } // needed no encoding            }        }                return result.toString();    }        /**     *  Converts a string which was previously conveted to URN format back into     *  the unencoded format.     *     *  @param source   the string to decode     *  @return String containing the decoded form of the URN.     **/    public static String decodeURN(String source) {        StringBuilder result = new StringBuilder(source.length());        // remove the % encoding for all chars which needed it.        for (int eachChar = 0; eachChar < source.length(); eachChar++) {            char aChar = source.charAt(eachChar);            if ('%' != aChar) {                result.append(aChar);            } else {                String twoChars = source.substring(eachChar + 1, eachChar + 3);                result.append((char) Integer.parseInt(twoChars, 16));                eachChar += 2;            }        }        String fromUTF8 = null;        try {            // first we get its bytes using ISO-8859-1 to encode its characters.            // ISO-8859-1 does no mapping. Each byte is the same as the character.            byte[] asBytes = result.toString().getBytes("ISO-8859-1");            // then read it back in as UTF8. This gets us any high byte chars back            fromUTF8 = new String(asBytes, "UTF8");        } catch (java.io.UnsupportedEncodingException never) {            // these 2 encodings are required so this exception will never happen            ;        }        return fromUTF8;    }}