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 | } |