1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/classes/javax/lang/model/SourceVersion.java Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,258 @@
1.4 +/*
1.5 + * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Sun designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Sun in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.25 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.26 + * have any questions.
1.27 + */
1.28 +
1.29 +package javax.lang.model;
1.30 +
1.31 +import java.util.Collections;
1.32 +import java.util.Set;
1.33 +import java.util.HashSet;
1.34 +
1.35 +/**
1.36 + * Source versions of the Java™ programming language.
1.37 + *
1.38 + * See <a
1.39 + * href="http://java.sun.com/docs/books/jls/">http://java.sun.com/docs/books/jls/</a>
1.40 + * for information on editions of <i>The Java™ Language
1.41 + * Specification</i>, including updates and clarifications.
1.42 + *
1.43 + * <p>Note that additional source version constants will be added to
1.44 + * model future releases of the language.
1.45 + *
1.46 + * @author Joseph D. Darcy
1.47 + * @author Scott Seligman
1.48 + * @author Peter von der Ahé
1.49 + * @since 1.6
1.50 + */
1.51 +public enum SourceVersion {
1.52 + /*
1.53 + * Summary of language evoluation
1.54 + * 1.1: nested classes
1.55 + * 1.2: strictfp
1.56 + * 1.3: no changes
1.57 + * 1.4: assert
1.58 + * 1.5: annotations, generics, autoboxing, var-args...
1.59 + * 1.6: no changes
1.60 + */
1.61 +
1.62 + /**
1.63 + * The original version.
1.64 + *
1.65 + * The language described in the first edition of <i>The
1.66 + * Java™ Language Specification</i>.
1.67 + */
1.68 + RELEASE_0,
1.69 +
1.70 + /**
1.71 + * The version recognized by the Java Platform 1.1.
1.72 + *
1.73 + * The language is {@code RELEASE_0} <a
1.74 + * href="http://java.sun.com/docs/books/jls/first_edition/html/1.1Update.html">augmented</a>
1.75 + * with nested classes.
1.76 + */
1.77 + RELEASE_1,
1.78 +
1.79 + /**
1.80 + * The version recognized by the Java 2 Platform, Standard Edition,
1.81 + * v 1.2.
1.82 + *
1.83 + * The language described in <i>The Java™ Language
1.84 + * Specification, Second Edition</i>, which includes the {@code
1.85 + * strictfp} modifier.
1.86 + */
1.87 + RELEASE_2,
1.88 +
1.89 + /**
1.90 + * The version recognized by the Java 2 Platform, Standard Edition,
1.91 + * v 1.3.
1.92 + *
1.93 + * No major changes from {@code RELEASE_2}.
1.94 + */
1.95 + RELEASE_3,
1.96 +
1.97 + /**
1.98 + * The version recognized by the Java 2 Platform, Standard Edition,
1.99 + * v 1.4.
1.100 + *
1.101 + * Added a simple assertion facility.
1.102 + */
1.103 + RELEASE_4,
1.104 +
1.105 + /**
1.106 + * The version recognized by the Java 2 Platform, Standard
1.107 + * Edition 5.0.
1.108 + *
1.109 + * The language described in <i>The Java™ Language
1.110 + * Specification, Third Edition</i>. First release to support
1.111 + * generics, annotations, autoboxing, var-args, enhanced {@code
1.112 + * for} loop, and hexadecimal floating-point literals.
1.113 + */
1.114 + RELEASE_5,
1.115 +
1.116 + /**
1.117 + * The version recognized by the Java Platform, Standard Edition
1.118 + * 6.
1.119 + *
1.120 + * No major changes from {@code RELEASE_5}.
1.121 + */
1.122 + RELEASE_6,
1.123 +
1.124 + /**
1.125 + * The version recognized by the Java Platform, Standard Edition
1.126 + * 7.
1.127 + *
1.128 + * @since 1.7
1.129 + */
1.130 + RELEASE_7;
1.131 +
1.132 + // Note that when adding constants for newer releases, the
1.133 + // behavior of latest() and latestSupported() must be updated too.
1.134 +
1.135 + /**
1.136 + * Returns the latest source version that can be modeled.
1.137 + *
1.138 + * @return the latest source version that can be modeled
1.139 + */
1.140 + public static SourceVersion latest() {
1.141 + return RELEASE_7;
1.142 + }
1.143 +
1.144 + private static final SourceVersion latestSupported = getLatestSupported();
1.145 +
1.146 + private static SourceVersion getLatestSupported() {
1.147 + try {
1.148 + String specVersion = System.getProperty("java.specification.version");
1.149 + if ("1.7".equals(specVersion))
1.150 + return RELEASE_7;
1.151 + else if ("1.6".equals(specVersion))
1.152 + return RELEASE_6;
1.153 + } catch (SecurityException se) {}
1.154 +
1.155 + return RELEASE_5;
1.156 + }
1.157 +
1.158 + /**
1.159 + * Returns the latest source version fully supported by the
1.160 + * current execution environment. {@code RELEASE_5} or later must
1.161 + * be returned.
1.162 + *
1.163 + * @return the latest source version that is fully supported
1.164 + */
1.165 + public static SourceVersion latestSupported() {
1.166 + return latestSupported;
1.167 + }
1.168 +
1.169 + /**
1.170 + * Returns whether or not {@code name} is a syntactically valid
1.171 + * identifier (simple name) or keyword in the latest source
1.172 + * version. The method returns {@code true} if the name consists
1.173 + * of an initial character for which {@link
1.174 + * Character#isJavaIdentifierStart(int)} returns {@code true},
1.175 + * followed only by characters for which {@link
1.176 + * Character#isJavaIdentifierPart(int)} returns {@code true}.
1.177 + * This pattern matches regular identifiers, keywords, and the
1.178 + * literals {@code "true"}, {@code "false"}, and {@code "null"}.
1.179 + * The method returns {@code false} for all other strings.
1.180 + *
1.181 + * @param name the string to check
1.182 + * @return {@code true} if this string is a
1.183 + * syntactically valid identifier or keyword, {@code false}
1.184 + * otherwise.
1.185 + */
1.186 + public static boolean isIdentifier(CharSequence name) {
1.187 + String id = name.toString();
1.188 +
1.189 + if (id.length() == 0) {
1.190 + return false;
1.191 + }
1.192 + int cp = id.codePointAt(0);
1.193 + if (!Character.isJavaIdentifierStart(cp)) {
1.194 + return false;
1.195 + }
1.196 + for (int i = Character.charCount(cp);
1.197 + i < id.length();
1.198 + i += Character.charCount(cp)) {
1.199 + cp = id.codePointAt(i);
1.200 + if (!Character.isJavaIdentifierPart(cp)) {
1.201 + return false;
1.202 + }
1.203 + }
1.204 + return true;
1.205 + }
1.206 +
1.207 + /**
1.208 + * Returns whether or not {@code name} is a syntactically valid
1.209 + * qualified name in the latest source version. Unlike {@link
1.210 + * #isIdentifier isIdentifier}, this method returns {@code false}
1.211 + * for keywords and literals.
1.212 + *
1.213 + * @param name the string to check
1.214 + * @return {@code true} if this string is a
1.215 + * syntactically valid name, {@code false} otherwise.
1.216 + * @jls3 6.2 Names and Identifiers
1.217 + */
1.218 + public static boolean isName(CharSequence name) {
1.219 + String id = name.toString();
1.220 +
1.221 + for(String s : id.split("\\.", -1)) {
1.222 + if (!isIdentifier(s) || isKeyword(s))
1.223 + return false;
1.224 + }
1.225 + return true;
1.226 + }
1.227 +
1.228 + private final static Set<String> keywords;
1.229 + static {
1.230 + Set<String> s = new HashSet<String>();
1.231 + String [] kws = {
1.232 + "abstract", "continue", "for", "new", "switch",
1.233 + "assert", "default", "if", "package", "synchronized",
1.234 + "boolean", "do", "goto", "private", "this",
1.235 + "break", "double", "implements", "protected", "throw",
1.236 + "byte", "else", "import", "public", "throws",
1.237 + "case", "enum", "instanceof", "return", "transient",
1.238 + "catch", "extends", "int", "short", "try",
1.239 + "char", "final", "interface", "static", "void",
1.240 + "class", "finally", "long", "strictfp", "volatile",
1.241 + "const", "float", "native", "super", "while",
1.242 + // literals
1.243 + "null", "true", "false"
1.244 + };
1.245 + for(String kw : kws)
1.246 + s.add(kw);
1.247 + keywords = Collections.unmodifiableSet(s);
1.248 + }
1.249 +
1.250 + /**
1.251 + * Returns whether or not {@code s} is a keyword or literal in the
1.252 + * latest source version.
1.253 + *
1.254 + * @param s the string to check
1.255 + * @return {@code true} if {@code s} is a keyword or literal, {@code false} otherwise.
1.256 + */
1.257 + public static boolean isKeyword(CharSequence s) {
1.258 + String keywordOrLiteral = s.toString();
1.259 + return keywords.contains(keywordOrLiteral);
1.260 + }
1.261 +}
