| 1 | /* |
| 2 | * Copyright 2005-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package javax.lang.model; |
| 27 | |
| 28 | import java.util.Collections; |
| 29 | import java.util.Set; |
| 30 | import java.util.HashSet; |
| 31 | |
| 32 | /** |
| 33 | * Source versions of the Java™ programming language. |
| 34 | * |
| 35 | * See <a |
| 36 | * href="http://java.sun.com/docs/books/jls/">http://java.sun.com/docs/books/jls/</a> |
| 37 | * for information on editions of <i>The Java™ Language |
| 38 | * Specification</i>, including updates and clarifications. |
| 39 | * |
| 40 | * <p>Note that additional source version constants will be added to |
| 41 | * model future releases of the language. |
| 42 | * |
| 43 | * @author Joseph D. Darcy |
| 44 | * @author Scott Seligman |
| 45 | * @author Peter von der Ahé |
| 46 | * @since 1.6 |
| 47 | */ |
| 48 | public enum SourceVersion { |
| 49 | /* |
| 50 | * Summary of language evoluation |
| 51 | * 1.1: nested classes |
| 52 | * 1.2: strictfp |
| 53 | * 1.3: no changes |
| 54 | * 1.4: assert |
| 55 | * 1.5: annotations, generics, autoboxing, var-args... |
| 56 | * 1.6: no changes |
| 57 | */ |
| 58 | |
| 59 | /** |
| 60 | * The original version. |
| 61 | * |
| 62 | * The language described in the first edition of <i>The |
| 63 | * Java™ Language Specification</i>. |
| 64 | */ |
| 65 | RELEASE_0, |
| 66 | |
| 67 | /** |
| 68 | * The version recognized by the Java Platform 1.1. |
| 69 | * |
| 70 | * The language is {@code RELEASE_0} <a |
| 71 | * href="http://java.sun.com/docs/books/jls/first_edition/html/1.1Update.html">augmented</a> |
| 72 | * with nested classes. |
| 73 | */ |
| 74 | RELEASE_1, |
| 75 | |
| 76 | /** |
| 77 | * The version recognized by the Java 2 Platform, Standard Edition, |
| 78 | * v 1.2. |
| 79 | * |
| 80 | * The language described in <i>The Java™ Language |
| 81 | * Specification, Second Edition</i>, which includes the {@code |
| 82 | * strictfp} modifier. |
| 83 | */ |
| 84 | RELEASE_2, |
| 85 | |
| 86 | /** |
| 87 | * The version recognized by the Java 2 Platform, Standard Edition, |
| 88 | * v 1.3. |
| 89 | * |
| 90 | * No major changes from {@code RELEASE_2}. |
| 91 | */ |
| 92 | RELEASE_3, |
| 93 | |
| 94 | /** |
| 95 | * The version recognized by the Java 2 Platform, Standard Edition, |
| 96 | * v 1.4. |
| 97 | * |
| 98 | * Added a simple assertion facility. |
| 99 | */ |
| 100 | RELEASE_4, |
| 101 | |
| 102 | /** |
| 103 | * The version recognized by the Java 2 Platform, Standard |
| 104 | * Edition 5.0. |
| 105 | * |
| 106 | * The language described in <i>The Java™ Language |
| 107 | * Specification, Third Edition</i>. First release to support |
| 108 | * generics, annotations, autoboxing, var-args, enhanced {@code |
| 109 | * for} loop, and hexadecimal floating-point literals. |
| 110 | */ |
| 111 | RELEASE_5, |
| 112 | |
| 113 | /** |
| 114 | * The version recognized by the Java Platform, Standard Edition |
| 115 | * 6. |
| 116 | * |
| 117 | * No major changes from {@code RELEASE_5}. |
| 118 | */ |
| 119 | RELEASE_6, |
| 120 | |
| 121 | /** |
| 122 | * The version recognized by the Java Platform, Standard Edition |
| 123 | * 7. |
| 124 | * |
| 125 | * @since 1.7 |
| 126 | */ |
| 127 | RELEASE_7; |
| 128 | |
| 129 | // Note that when adding constants for newer releases, the |
| 130 | // behavior of latest() and latestSupported() must be updated too. |
| 131 | |
| 132 | /** |
| 133 | * Returns the latest source version that can be modeled. |
| 134 | * |
| 135 | * @return the latest source version that can be modeled |
| 136 | */ |
| 137 | public static SourceVersion latest() { |
| 138 | return RELEASE_7; |
| 139 | } |
| 140 | |
| 141 | private static final SourceVersion latestSupported = getLatestSupported(); |
| 142 | |
| 143 | private static SourceVersion getLatestSupported() { |
| 144 | try { |
| 145 | String specVersion = System.getProperty("java.specification.version"); |
| 146 | if ("1.7".equals(specVersion)) |
| 147 | return RELEASE_7; |
| 148 | else if ("1.6".equals(specVersion)) |
| 149 | return RELEASE_6; |
| 150 | } catch (SecurityException se) {} |
| 151 | |
| 152 | return RELEASE_5; |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * Returns the latest source version fully supported by the |
| 157 | * current execution environment. {@code RELEASE_5} or later must |
| 158 | * be returned. |
| 159 | * |
| 160 | * @return the latest source version that is fully supported |
| 161 | */ |
| 162 | public static SourceVersion latestSupported() { |
| 163 | return latestSupported; |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * Returns whether or not {@code name} is a syntactically valid |
| 168 | * identifier (simple name) or keyword in the latest source |
| 169 | * version. The method returns {@code true} if the name consists |
| 170 | * of an initial character for which {@link |
| 171 | * Character#isJavaIdentifierStart(int)} returns {@code true}, |
| 172 | * followed only by characters for which {@link |
| 173 | * Character#isJavaIdentifierPart(int)} returns {@code true}. |
| 174 | * This pattern matches regular identifiers, keywords, and the |
| 175 | * literals {@code "true"}, {@code "false"}, and {@code "null"}. |
| 176 | * The method returns {@code false} for all other strings. |
| 177 | * |
| 178 | * @param name the string to check |
| 179 | * @return {@code true} if this string is a |
| 180 | * syntactically valid identifier or keyword, {@code false} |
| 181 | * otherwise. |
| 182 | */ |
| 183 | public static boolean isIdentifier(CharSequence name) { |
| 184 | String id = name.toString(); |
| 185 | |
| 186 | if (id.length() == 0) { |
| 187 | return false; |
| 188 | } |
| 189 | int cp = id.codePointAt(0); |
| 190 | if (!Character.isJavaIdentifierStart(cp)) { |
| 191 | return false; |
| 192 | } |
| 193 | for (int i = Character.charCount(cp); |
| 194 | i < id.length(); |
| 195 | i += Character.charCount(cp)) { |
| 196 | cp = id.codePointAt(i); |
| 197 | if (!Character.isJavaIdentifierPart(cp)) { |
| 198 | return false; |
| 199 | } |
| 200 | } |
| 201 | return true; |
| 202 | } |
| 203 | |
| 204 | /** |
| 205 | * Returns whether or not {@code name} is a syntactically valid |
| 206 | * qualified name in the latest source version. Unlike {@link |
| 207 | * #isIdentifier isIdentifier}, this method returns {@code false} |
| 208 | * for keywords and literals. |
| 209 | * |
| 210 | * @param name the string to check |
| 211 | * @return {@code true} if this string is a |
| 212 | * syntactically valid name, {@code false} otherwise. |
| 213 | * @jls3 6.2 Names and Identifiers |
| 214 | */ |
| 215 | public static boolean isName(CharSequence name) { |
| 216 | String id = name.toString(); |
| 217 | |
| 218 | for(String s : id.split("\\.", -1)) { |
| 219 | if (!isIdentifier(s) || isKeyword(s)) |
| 220 | return false; |
| 221 | } |
| 222 | return true; |
| 223 | } |
| 224 | |
| 225 | private final static Set<String> keywords; |
| 226 | static { |
| 227 | Set<String> s = new HashSet<String>(); |
| 228 | String [] kws = { |
| 229 | "abstract", "continue", "for", "new", "switch", |
| 230 | "assert", "default", "if", "package", "synchronized", |
| 231 | "boolean", "do", "goto", "private", "this", |
| 232 | "break", "double", "implements", "protected", "throw", |
| 233 | "byte", "else", "import", "public", "throws", |
| 234 | "case", "enum", "instanceof", "return", "transient", |
| 235 | "catch", "extends", "int", "short", "try", |
| 236 | "char", "final", "interface", "static", "void", |
| 237 | "class", "finally", "long", "strictfp", "volatile", |
| 238 | "const", "float", "native", "super", "while", |
| 239 | // literals |
| 240 | "null", "true", "false" |
| 241 | }; |
| 242 | for(String kw : kws) |
| 243 | s.add(kw); |
| 244 | keywords = Collections.unmodifiableSet(s); |
| 245 | } |
| 246 | |
| 247 | /** |
| 248 | * Returns whether or not {@code s} is a keyword or literal in the |
| 249 | * latest source version. |
| 250 | * |
| 251 | * @param s the string to check |
| 252 | * @return {@code true} if {@code s} is a keyword or literal, {@code false} otherwise. |
| 253 | */ |
| 254 | public static boolean isKeyword(CharSequence s) { |
| 255 | String keywordOrLiteral = s.toString(); |
| 256 | return keywords.contains(keywordOrLiteral); |
| 257 | } |
| 258 | } |