Uri.java revision 524:dcaa586ab756
1/* 2 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25/* 26 * Copyright (C) 2004-2011 27 * 28 * Permission is hereby granted, free of charge, to any person obtaining a copy 29 * of this software and associated documentation files (the "Software"), to deal 30 * in the Software without restriction, including without limitation the rights 31 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 32 * copies of the Software, and to permit persons to whom the Software is 33 * furnished to do so, subject to the following conditions: 34 * 35 * The above copyright notice and this permission notice shall be included in 36 * all copies or substantial portions of the Software. 37 * 38 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 39 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 40 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 41 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 42 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 43 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 44 * THE SOFTWARE. 45 */ 46package com.sun.xml.internal.rngom.util; 47 48import java.net.URL; 49import java.net.MalformedURLException; 50import java.io.UnsupportedEncodingException; 51 52public class Uri { 53 private static String utf8 = "UTF-8"; 54 55 public static boolean isValid(String s) { 56 return isValidPercent(s) && isValidFragment(s) && isValidScheme(s); 57 } 58 59 private static final String HEX_DIGITS = "0123456789abcdef"; 60 61 public static String escapeDisallowedChars(String s) { 62 StringBuffer buf = null; 63 int len = s.length(); 64 int done = 0; 65 for (;;) { 66 int i = done; 67 for (;;) { 68 if (i == len) { 69 if (done == 0) 70 return s; 71 break; 72 } 73 if (isExcluded(s.charAt(i))) 74 break; 75 i++; 76 } 77 if (buf == null) 78 buf = new StringBuffer(); 79 if (i > done) { 80 buf.append(s.substring(done, i)); 81 done = i; 82 } 83 if (i == len) 84 break; 85 for (i++; i < len && isExcluded(s.charAt(i)); i++) 86 ; 87 String tem = s.substring(done, i); 88 byte[] bytes; 89 try { 90 bytes = tem.getBytes(utf8); 91 } 92 catch (UnsupportedEncodingException e) { 93 utf8 = "UTF8"; 94 try { 95 bytes = tem.getBytes(utf8); 96 } 97 catch (UnsupportedEncodingException e2) { 98 // Give up 99 return s; 100 } 101 } 102 for (int j = 0; j < bytes.length; j++) { 103 buf.append('%'); 104 buf.append(HEX_DIGITS.charAt((bytes[j] & 0xFF) >> 4)); 105 buf.append(HEX_DIGITS.charAt(bytes[j] & 0xF)); 106 } 107 done = i; 108 } 109 return buf.toString(); 110 } 111 112 private static final String excluded = "<>\"{}|\\^`"; 113 114 private static boolean isExcluded(char c) { 115 return c <= 0x20 || c >= 0x7F || excluded.indexOf(c) >= 0; 116 } 117 118 private static boolean isAlpha(char c) { 119 return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'); 120 } 121 122 private static boolean isHexDigit(char c) { 123 return ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F') || isDigit(c); 124 } 125 126 private static boolean isDigit(char c) { 127 return '0' <= c && c <= '9'; 128 } 129 130 private static boolean isSchemeChar(char c) { 131 return isAlpha(c) || isDigit(c) || c == '+' || c == '-' || c =='.'; 132 } 133 134 private static boolean isValidPercent(String s) { 135 int len = s.length(); 136 for (int i = 0; i < len; i++) 137 if (s.charAt(i) == '%') { 138 if (i + 2 >= len) 139 return false; 140 else if (!isHexDigit(s.charAt(i + 1)) 141 || !isHexDigit(s.charAt(i + 2))) 142 return false; 143 } 144 return true; 145 } 146 147 private static boolean isValidFragment(String s) { 148 int i = s.indexOf('#'); 149 return i < 0 || s.indexOf('#', i + 1) < 0; 150 } 151 152 private static boolean isValidScheme(String s) { 153 if (!isAbsolute(s)) 154 return true; 155 int i = s.indexOf(':'); 156 if (i == 0 157 || i + 1 == s.length() 158 || !isAlpha(s.charAt(0))) 159 return false; 160 while (--i > 0) 161 if (!isSchemeChar(s.charAt(i))) 162 return false; 163 return true; 164 } 165 166 public static String resolve(String baseUri, String uriReference) { 167 if (!isAbsolute(uriReference) && baseUri != null && isAbsolute(baseUri)) { 168 try { 169 return new URL(new URL(baseUri), uriReference).toString(); 170 } 171 catch (MalformedURLException e) { } 172 } 173 return uriReference; 174 } 175 176 public static boolean hasFragmentId(String uri) { 177 return uri.indexOf('#') >= 0; 178 } 179 180 public static boolean isAbsolute(String uri) { 181 int i = uri.indexOf(':'); 182 if (i < 0) 183 return false; 184 while (--i >= 0) { 185 switch (uri.charAt(i)) { 186 case '#': 187 case '/': 188 case '?': 189 return false; 190 } 191 } 192 return true; 193 } 194} 195