Jake Slack | 03928ae | 2014-05-13 18:41:56 -0700 | [diff] [blame] | 1 | // |
| 2 | // ======================================================================== |
| 3 | // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
| 4 | // ------------------------------------------------------------------------ |
| 5 | // All rights reserved. This program and the accompanying materials |
| 6 | // are made available under the terms of the Eclipse Public License v1.0 |
| 7 | // and Apache License v2.0 which accompanies this distribution. |
| 8 | // |
| 9 | // The Eclipse Public License is available at |
| 10 | // http://www.eclipse.org/legal/epl-v10.html |
| 11 | // |
| 12 | // The Apache License v2.0 is available at |
| 13 | // http://www.opensource.org/licenses/apache2.0.php |
| 14 | // |
| 15 | // You may elect to redistribute this code under either of these licenses. |
| 16 | // ======================================================================== |
| 17 | // |
| 18 | |
| 19 | |
| 20 | package org.eclipse.jetty.webapp; |
| 21 | |
| 22 | import java.util.ArrayList; |
| 23 | import java.util.List; |
| 24 | import java.util.StringTokenizer; |
| 25 | |
| 26 | |
| 27 | /* ------------------------------------------------------------ */ |
| 28 | /** |
| 29 | * ClasspathPattern performs sequential pattern matching of a class name |
| 30 | * against an internal array of classpath pattern entries. |
| 31 | * |
| 32 | * When an entry starts with '-' (minus), reverse matching is performed. |
| 33 | * When an entry ends with '.' (period), prefix matching is performed. |
| 34 | * |
| 35 | * When class is initialized from a classpath pattern string, entries |
| 36 | * in this string should be separated by ':' (semicolon) or ',' (comma). |
| 37 | */ |
| 38 | |
| 39 | public class ClasspathPattern |
| 40 | { |
| 41 | private static class Entry |
| 42 | { |
| 43 | public String classpath = null; |
| 44 | public boolean result = false; |
| 45 | public boolean partial = false; |
| 46 | } |
| 47 | |
| 48 | final private List<String> _patterns = new ArrayList<String>(); |
| 49 | final private List<Entry> _entries = new ArrayList<Entry>(); |
| 50 | |
| 51 | /* ------------------------------------------------------------ */ |
| 52 | public ClasspathPattern() |
| 53 | { |
| 54 | } |
| 55 | |
| 56 | /* ------------------------------------------------------------ */ |
| 57 | public ClasspathPattern(String[] patterns) |
| 58 | { |
| 59 | setPatterns(patterns); |
| 60 | } |
| 61 | |
| 62 | /* ------------------------------------------------------------ */ |
| 63 | public ClasspathPattern(String pattern) |
| 64 | { |
| 65 | setPattern(pattern); |
| 66 | } |
| 67 | |
| 68 | |
| 69 | /* ------------------------------------------------------------ */ |
| 70 | /** |
| 71 | * Initialize the matcher by parsing each classpath pattern in an array |
| 72 | * |
| 73 | * @param patterns array of classpath patterns |
| 74 | */ |
| 75 | private void setPatterns(String[] patterns) |
| 76 | { |
| 77 | _patterns.clear(); |
| 78 | _entries.clear(); |
| 79 | addPatterns(patterns); |
| 80 | } |
| 81 | |
| 82 | /* ------------------------------------------------------------ */ |
| 83 | /** |
| 84 | * Initialize the matcher by parsing each classpath pattern in an array |
| 85 | * |
| 86 | * @param patterns array of classpath patterns |
| 87 | */ |
| 88 | private void addPatterns(String[] patterns) |
| 89 | { |
| 90 | if (patterns != null) |
| 91 | { |
| 92 | Entry entry = null; |
| 93 | for (String pattern : patterns) |
| 94 | { |
| 95 | entry = createEntry(pattern); |
| 96 | if (entry != null) { |
| 97 | _patterns.add(pattern); |
| 98 | _entries.add(entry); |
| 99 | } |
| 100 | } |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | /* ------------------------------------------------------------ */ |
| 105 | /** |
| 106 | * Create an entry object containing information about |
| 107 | * a single classpath pattern |
| 108 | * |
| 109 | * @param pattern single classpath pattern |
| 110 | * @return corresponding Entry object |
| 111 | */ |
| 112 | private Entry createEntry(String pattern) |
| 113 | { |
| 114 | Entry entry = null; |
| 115 | |
| 116 | if (pattern != null) |
| 117 | { |
| 118 | String item = pattern.trim(); |
| 119 | if (item.length() > 0) |
| 120 | { |
| 121 | entry = new Entry(); |
| 122 | entry.result = !item.startsWith("-"); |
| 123 | entry.partial = item.endsWith("."); |
| 124 | entry.classpath = entry.result ? item : item.substring(1).trim(); |
| 125 | } |
| 126 | } |
| 127 | return entry; |
| 128 | } |
| 129 | |
| 130 | /* ------------------------------------------------------------ */ |
| 131 | /** |
| 132 | * Initialize the matcher by parsing a classpath pattern string |
| 133 | * |
| 134 | * @param pattern classpath pattern string |
| 135 | */ |
| 136 | public void setPattern(String pattern) |
| 137 | { |
| 138 | _patterns.clear(); |
| 139 | _entries.clear(); |
| 140 | addPattern(pattern); |
| 141 | } |
| 142 | |
| 143 | /* ------------------------------------------------------------ */ |
| 144 | /** |
| 145 | * Parse a classpath pattern string and appending the result |
| 146 | * to the existing configuration. |
| 147 | * |
| 148 | * @param pattern classpath pattern string |
| 149 | */ |
| 150 | public void addPattern(String pattern) |
| 151 | { |
| 152 | ArrayList<String> patterns = new ArrayList<String>(); |
| 153 | StringTokenizer entries = new StringTokenizer(pattern, ":,"); |
| 154 | while (entries.hasMoreTokens()) |
| 155 | { |
| 156 | patterns.add(entries.nextToken()); |
| 157 | } |
| 158 | |
| 159 | addPatterns((String[])patterns.toArray(new String[patterns.size()])); |
| 160 | } |
| 161 | |
| 162 | /* ------------------------------------------------------------ */ |
| 163 | /** |
| 164 | * @return array of classpath patterns |
| 165 | */ |
| 166 | public String[] getPatterns() |
| 167 | { |
| 168 | String[] patterns = null; |
| 169 | |
| 170 | if (_patterns!=null && _patterns.size() > 0) |
| 171 | { |
| 172 | patterns = _patterns.toArray(new String[_patterns.size()]); |
| 173 | } |
| 174 | |
| 175 | return patterns; |
| 176 | } |
| 177 | |
| 178 | /* ------------------------------------------------------------ */ |
| 179 | /** |
| 180 | * Match the class name against the pattern |
| 181 | * |
| 182 | * @param name name of the class to match |
| 183 | * @return true if class matches the pattern |
| 184 | */ |
| 185 | public boolean match(String name) |
| 186 | { |
| 187 | boolean result=false; |
| 188 | |
| 189 | if (_entries != null) |
| 190 | { |
| 191 | name = name.replace('/','.'); |
| 192 | |
| 193 | int startIndex = 0; |
| 194 | |
| 195 | while(startIndex < name.length() && name.charAt(startIndex) == '.') { |
| 196 | startIndex++; |
| 197 | } |
| 198 | |
| 199 | int dollar = name.indexOf("$"); |
| 200 | |
| 201 | int endIndex = dollar != -1 ? dollar : name.length(); |
| 202 | |
| 203 | for (Entry entry : _entries) |
| 204 | { |
| 205 | if (entry != null) |
| 206 | { |
| 207 | if (entry.partial) |
| 208 | { |
| 209 | if (name.regionMatches(startIndex, entry.classpath, 0, entry.classpath.length())) |
| 210 | { |
| 211 | result = entry.result; |
| 212 | break; |
| 213 | } |
| 214 | } |
| 215 | else |
| 216 | { |
| 217 | int regionLength = endIndex-startIndex; |
| 218 | if (regionLength == entry.classpath.length() |
| 219 | && name.regionMatches(startIndex, entry.classpath, 0, regionLength)) |
| 220 | { |
| 221 | result = entry.result; |
| 222 | break; |
| 223 | } |
| 224 | } |
| 225 | } |
| 226 | } |
| 227 | } |
| 228 | return result; |
| 229 | } |
| 230 | } |