| /* |
| * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package javax.lang.model; |
| |
| import java.util.Collections; |
| import java.util.Set; |
| import java.util.HashSet; |
| |
| /** |
| * Source versions of the Java™ programming language. |
| * |
| * See the appropriate edition of |
| * <cite>The Java™ Language Specification</cite> |
| * for information about a particular source version. |
| * |
| * <p>Note that additional source version constants will be added to |
| * model future releases of the language. |
| * |
| * @author Joseph D. Darcy |
| * @author Scott Seligman |
| * @author Peter von der Ahé |
| * @since 1.6 |
| */ |
| public enum SourceVersion { |
| /* |
| * Summary of language evolution |
| * 1.1: nested classes |
| * 1.2: strictfp |
| * 1.3: no changes |
| * 1.4: assert |
| * 1.5: annotations, generics, autoboxing, var-args... |
| * 1.6: no changes |
| * 1.7: diamond syntax, try-with-resources, etc. |
| * 1.8: lambda expressions and default methods |
| */ |
| |
| /** |
| * The original version. |
| * |
| * The language described in |
| * <cite>The Java™ Language Specification, First Edition</cite>. |
| */ |
| RELEASE_0, |
| |
| /** |
| * The version recognized by the Java Platform 1.1. |
| * |
| * The language is {@code RELEASE_0} augmented with nested classes as described in the 1.1 update to |
| * <cite>The Java™ Language Specification, First Edition</cite>. |
| */ |
| RELEASE_1, |
| |
| /** |
| * The version recognized by the Java 2 Platform, Standard Edition, |
| * v 1.2. |
| * |
| * The language described in |
| * <cite>The Java™ Language Specification, |
| * Second Edition</cite>, which includes the {@code |
| * strictfp} modifier. |
| */ |
| RELEASE_2, |
| |
| /** |
| * The version recognized by the Java 2 Platform, Standard Edition, |
| * v 1.3. |
| * |
| * No major changes from {@code RELEASE_2}. |
| */ |
| RELEASE_3, |
| |
| /** |
| * The version recognized by the Java 2 Platform, Standard Edition, |
| * v 1.4. |
| * |
| * Added a simple assertion facility. |
| */ |
| RELEASE_4, |
| |
| /** |
| * The version recognized by the Java 2 Platform, Standard |
| * Edition 5.0. |
| * |
| * The language described in |
| * <cite>The Java™ Language Specification, |
| * Third Edition</cite>. First release to support |
| * generics, annotations, autoboxing, var-args, enhanced {@code |
| * for} loop, and hexadecimal floating-point literals. |
| */ |
| RELEASE_5, |
| |
| /** |
| * The version recognized by the Java Platform, Standard Edition |
| * 6. |
| * |
| * No major changes from {@code RELEASE_5}. |
| */ |
| RELEASE_6, |
| |
| /** |
| * The version recognized by the Java Platform, Standard Edition |
| * 7. |
| * |
| * Additions in this release include, diamond syntax for |
| * constructors, {@code try}-with-resources, strings in switch, |
| * binary literals, and multi-catch. |
| * @since 1.7 |
| */ |
| RELEASE_7, |
| |
| /** |
| * The version recognized by the Java Platform, Standard Edition |
| * 8. |
| * |
| * Additions in this release include lambda expressions and default methods. |
| * @since 1.8 |
| */ |
| RELEASE_8; |
| |
| // Note that when adding constants for newer releases, the |
| // behavior of latest() and latestSupported() must be updated too. |
| |
| /** |
| * Returns the latest source version that can be modeled. |
| * |
| * @return the latest source version that can be modeled |
| */ |
| public static SourceVersion latest() { |
| return RELEASE_8; |
| } |
| |
| private static final SourceVersion latestSupported = getLatestSupported(); |
| |
| private static SourceVersion getLatestSupported() { |
| try { |
| String specVersion = System.getProperty("java.specification.version"); |
| |
| if ("1.8".equals(specVersion)) |
| return RELEASE_8; |
| else if("1.7".equals(specVersion)) |
| return RELEASE_7; |
| else if("1.6".equals(specVersion)) |
| return RELEASE_6; |
| } catch (SecurityException se) {} |
| |
| return RELEASE_5; |
| } |
| |
| /** |
| * Returns the latest source version fully supported by the |
| * current execution environment. {@code RELEASE_5} or later must |
| * be returned. |
| * |
| * @return the latest source version that is fully supported |
| */ |
| public static SourceVersion latestSupported() { |
| return latestSupported; |
| } |
| |
| /** |
| * Returns whether or not {@code name} is a syntactically valid |
| * identifier (simple name) or keyword in the latest source |
| * version. The method returns {@code true} if the name consists |
| * of an initial character for which {@link |
| * Character#isJavaIdentifierStart(int)} returns {@code true}, |
| * followed only by characters for which {@link |
| * Character#isJavaIdentifierPart(int)} returns {@code true}. |
| * This pattern matches regular identifiers, keywords, and the |
| * literals {@code "true"}, {@code "false"}, and {@code "null"}. |
| * The method returns {@code false} for all other strings. |
| * |
| * @param name the string to check |
| * @return {@code true} if this string is a |
| * syntactically valid identifier or keyword, {@code false} |
| * otherwise. |
| */ |
| public static boolean isIdentifier(CharSequence name) { |
| String id = name.toString(); |
| |
| if (id.length() == 0) { |
| return false; |
| } |
| int cp = id.codePointAt(0); |
| if (!Character.isJavaIdentifierStart(cp)) { |
| return false; |
| } |
| for (int i = Character.charCount(cp); |
| i < id.length(); |
| i += Character.charCount(cp)) { |
| cp = id.codePointAt(i); |
| if (!Character.isJavaIdentifierPart(cp)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Returns whether or not {@code name} is a syntactically valid |
| * qualified name in the latest source version. Unlike {@link |
| * #isIdentifier isIdentifier}, this method returns {@code false} |
| * for keywords and literals. |
| * |
| * @param name the string to check |
| * @return {@code true} if this string is a |
| * syntactically valid name, {@code false} otherwise. |
| * @jls 6.2 Names and Identifiers |
| */ |
| public static boolean isName(CharSequence name) { |
| String id = name.toString(); |
| |
| for(String s : id.split("\\.", -1)) { |
| if (!isIdentifier(s) || isKeyword(s)) |
| return false; |
| } |
| return true; |
| } |
| |
| private final static Set<String> keywords; |
| static { |
| Set<String> s = new HashSet<String>(); |
| String [] kws = { |
| "abstract", "continue", "for", "new", "switch", |
| "assert", "default", "if", "package", "synchronized", |
| "boolean", "do", "goto", "private", "this", |
| "break", "double", "implements", "protected", "throw", |
| "byte", "else", "import", "public", "throws", |
| "case", "enum", "instanceof", "return", "transient", |
| "catch", "extends", "int", "short", "try", |
| "char", "final", "interface", "static", "void", |
| "class", "finally", "long", "strictfp", "volatile", |
| "const", "float", "native", "super", "while", |
| // literals |
| "null", "true", "false" |
| }; |
| for(String kw : kws) |
| s.add(kw); |
| keywords = Collections.unmodifiableSet(s); |
| } |
| |
| /** |
| * Returns whether or not {@code s} is a keyword or literal in the |
| * latest source version. |
| * |
| * @param s the string to check |
| * @return {@code true} if {@code s} is a keyword or literal, {@code false} otherwise. |
| */ |
| public static boolean isKeyword(CharSequence s) { |
| String keywordOrLiteral = s.toString(); |
| return keywords.contains(keywordOrLiteral); |
| } |
| } |
