| /* |
| * Copyright 2005-2006 Sun Microsystems, Inc. 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. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| package javax.tools; |
| |
| import java.io.File; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.net.MalformedURLException; |
| import java.util.Locale; |
| import java.util.logging.Logger; |
| import java.util.logging.Level; |
| import static java.util.logging.Level.*; |
| |
| /** |
| * Provides methods for locating tool providers, for example, |
| * providers of compilers. This class complements the |
| * functionality of {@link java.util.ServiceLoader}. |
| * |
| * @author Peter von der Ahé |
| * @since 1.6 |
| */ |
| public class ToolProvider { |
| |
| private ToolProvider() {} |
| |
| private static final String propertyName = "sun.tools.ToolProvider"; |
| private static final String loggerName = "javax.tools"; |
| |
| /* |
| * Define the system property "sun.tools.ToolProvider" to enable |
| * debugging: |
| * |
| * java ... -Dsun.tools.ToolProvider ... |
| */ |
| static <T> T trace(Level level, Object reason) { |
| // NOTE: do not make this method private as it affects stack traces |
| try { |
| if (System.getProperty(propertyName) != null) { |
| StackTraceElement[] st = Thread.currentThread().getStackTrace(); |
| String method = "???"; |
| String cls = ToolProvider.class.getName(); |
| if (st.length > 2) { |
| StackTraceElement frame = st[2]; |
| method = String.format((Locale)null, "%s(%s:%s)", |
| frame.getMethodName(), |
| frame.getFileName(), |
| frame.getLineNumber()); |
| cls = frame.getClassName(); |
| } |
| Logger logger = Logger.getLogger(loggerName); |
| if (reason instanceof Throwable) { |
| logger.logp(level, cls, method, |
| reason.getClass().getName(), (Throwable)reason); |
| } else { |
| logger.logp(level, cls, method, String.valueOf(reason)); |
| } |
| } |
| } catch (SecurityException ex) { |
| System.err.format((Locale)null, "%s: %s; %s%n", |
| ToolProvider.class.getName(), |
| reason, |
| ex.getLocalizedMessage()); |
| } |
| return null; |
| } |
| |
| /** |
| * Gets the Java™ programming language compiler provided |
| * with this platform. |
| * @return the compiler provided with this platform or |
| * {@code null} if no compiler is provided |
| */ |
| public static JavaCompiler getSystemJavaCompiler() { |
| if (Lazy.compilerClass == null) |
| return trace(WARNING, "Lazy.compilerClass == null"); |
| try { |
| return Lazy.compilerClass.newInstance(); |
| } catch (Throwable e) { |
| return trace(WARNING, e); |
| } |
| } |
| |
| /** |
| * Returns the class loader for tools provided with this platform. |
| * This does not include user-installed tools. Use the |
| * {@linkplain java.util.ServiceLoader service provider mechanism} |
| * for locating user installed tools. |
| * |
| * @return the class loader for tools provided with this platform |
| * or {@code null} if no tools are provided |
| */ |
| public static ClassLoader getSystemToolClassLoader() { |
| if (Lazy.compilerClass == null) |
| return trace(WARNING, "Lazy.compilerClass == null"); |
| return Lazy.compilerClass.getClassLoader(); |
| } |
| |
| /** |
| * This class will not be initialized until one of the above |
| * methods are called. This ensures that searching for the |
| * compiler does not affect platform start up. |
| */ |
| static class Lazy { |
| private static final String defaultJavaCompilerName |
| = "com.sun.tools.javac.api.JavacTool"; |
| private static final String[] defaultToolsLocation |
| = { "lib", "tools.jar" }; |
| static final Class<? extends JavaCompiler> compilerClass; |
| static { |
| Class<? extends JavaCompiler> c = null; |
| try { |
| c = findClass().asSubclass(JavaCompiler.class); |
| } catch (Throwable t) { |
| trace(WARNING, t); |
| } |
| compilerClass = c; |
| } |
| |
| private static Class<?> findClass() |
| throws MalformedURLException, ClassNotFoundException |
| { |
| try { |
| return enableAsserts(Class.forName(defaultJavaCompilerName, false, null)); |
| } catch (ClassNotFoundException e) { |
| trace(FINE, e); |
| } |
| File file = new File(System.getProperty("java.home")); |
| if (file.getName().equalsIgnoreCase("jre")) |
| file = file.getParentFile(); |
| for (String name : defaultToolsLocation) |
| file = new File(file, name); |
| URL[] urls = {file.toURI().toURL()}; |
| trace(FINE, urls[0].toString()); |
| ClassLoader cl = URLClassLoader.newInstance(urls); |
| cl.setPackageAssertionStatus("com.sun.tools.javac", true); |
| return Class.forName(defaultJavaCompilerName, false, cl); |
| } |
| |
| private static Class<?> enableAsserts(Class<?> cls) { |
| try { |
| ClassLoader loader = cls.getClassLoader(); |
| if (loader != null) |
| loader.setPackageAssertionStatus("com.sun.tools.javac", true); |
| else |
| trace(FINE, "loader == null"); |
| } catch (SecurityException ex) { |
| trace(FINE, ex); |
| } |
| return cls; |
| } |
| } |
| } |