ToolProvider.java revision 0
0N/A/*
0N/A * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
0N/A * published by the Free Software Foundation. Sun designates this
0N/A * particular file as subject to the "Classpath" exception as provided
0N/A * by Sun in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
0N/A * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
0N/A * CA 95054 USA or visit www.sun.com if you need additional information or
0N/A * have any questions.
0N/A */
0N/A
0N/Apackage javax.tools;
0N/A
0N/Aimport java.io.File;
0N/Aimport java.net.URL;
0N/Aimport java.net.URLClassLoader;
0N/Aimport java.net.MalformedURLException;
0N/Aimport java.util.Locale;
0N/Aimport java.util.logging.Logger;
0N/Aimport java.util.logging.Level;
0N/Aimport static java.util.logging.Level.*;
0N/A
0N/A/**
0N/A * Provides methods for locating tool providers, for example,
0N/A * providers of compilers. This class complements the
0N/A * functionality of {@link java.util.ServiceLoader}.
0N/A *
0N/A * @author Peter von der Ahé
0N/A * @since 1.6
0N/A */
0N/Apublic class ToolProvider {
0N/A
0N/A private ToolProvider() {}
0N/A
0N/A private static final String propertyName = "sun.tools.ToolProvider";
0N/A private static final String loggerName = "javax.tools";
0N/A
0N/A /*
0N/A * Define the system property "sun.tools.ToolProvider" to enable
0N/A * debugging:
0N/A *
0N/A * java ... -Dsun.tools.ToolProvider ...
0N/A */
0N/A static <T> T trace(Level level, Object reason) {
0N/A // NOTE: do not make this method private as it affects stack traces
0N/A try {
0N/A if (System.getProperty(propertyName) != null) {
0N/A StackTraceElement[] st = Thread.currentThread().getStackTrace();
0N/A String method = "???";
0N/A String cls = ToolProvider.class.getName();
0N/A if (st.length > 2) {
0N/A StackTraceElement frame = st[2];
0N/A method = String.format((Locale)null, "%s(%s:%s)",
0N/A frame.getMethodName(),
0N/A frame.getFileName(),
0N/A frame.getLineNumber());
0N/A cls = frame.getClassName();
0N/A }
0N/A Logger logger = Logger.getLogger(loggerName);
0N/A if (reason instanceof Throwable) {
0N/A logger.logp(level, cls, method,
0N/A reason.getClass().getName(), (Throwable)reason);
0N/A } else {
0N/A logger.logp(level, cls, method, String.valueOf(reason));
0N/A }
0N/A }
0N/A } catch (SecurityException ex) {
0N/A System.err.format((Locale)null, "%s: %s; %s%n",
0N/A ToolProvider.class.getName(),
0N/A reason,
0N/A ex.getLocalizedMessage());
0N/A }
0N/A return null;
0N/A }
0N/A
0N/A /**
0N/A * Gets the Java&trade; programming language compiler provided
0N/A * with this platform.
0N/A * @return the compiler provided with this platform or
0N/A * {@code null} if no compiler is provided
0N/A */
0N/A public static JavaCompiler getSystemJavaCompiler() {
0N/A if (Lazy.compilerClass == null)
0N/A return trace(WARNING, "Lazy.compilerClass == null");
0N/A try {
0N/A return Lazy.compilerClass.newInstance();
0N/A } catch (Throwable e) {
0N/A return trace(WARNING, e);
0N/A }
0N/A }
0N/A
0N/A /**
0N/A * Returns the class loader for tools provided with this platform.
0N/A * This does not include user-installed tools. Use the
0N/A * {@linkplain java.util.ServiceLoader service provider mechanism}
0N/A * for locating user installed tools.
0N/A *
0N/A * @return the class loader for tools provided with this platform
0N/A * or {@code null} if no tools are provided
0N/A */
0N/A public static ClassLoader getSystemToolClassLoader() {
0N/A if (Lazy.compilerClass == null)
0N/A return trace(WARNING, "Lazy.compilerClass == null");
0N/A return Lazy.compilerClass.getClassLoader();
0N/A }
0N/A
0N/A /**
0N/A * This class will not be initialized until one of the above
0N/A * methods are called. This ensures that searching for the
0N/A * compiler does not affect platform start up.
0N/A */
0N/A static class Lazy {
0N/A private static final String defaultJavaCompilerName
0N/A = "com.sun.tools.javac.api.JavacTool";
0N/A private static final String[] defaultToolsLocation
0N/A = { "lib", "tools.jar" };
0N/A static final Class<? extends JavaCompiler> compilerClass;
0N/A static {
0N/A Class<? extends JavaCompiler> c = null;
0N/A try {
0N/A c = findClass().asSubclass(JavaCompiler.class);
0N/A } catch (Throwable t) {
0N/A trace(WARNING, t);
0N/A }
0N/A compilerClass = c;
0N/A }
0N/A
0N/A private static Class<?> findClass()
0N/A throws MalformedURLException, ClassNotFoundException
0N/A {
0N/A try {
0N/A return enableAsserts(Class.forName(defaultJavaCompilerName, false, null));
0N/A } catch (ClassNotFoundException e) {
0N/A trace(FINE, e);
0N/A }
0N/A File file = new File(System.getProperty("java.home"));
0N/A if (file.getName().equalsIgnoreCase("jre"))
0N/A file = file.getParentFile();
0N/A for (String name : defaultToolsLocation)
0N/A file = new File(file, name);
0N/A URL[] urls = {file.toURI().toURL()};
0N/A trace(FINE, urls[0].toString());
0N/A ClassLoader cl = URLClassLoader.newInstance(urls);
0N/A cl.setPackageAssertionStatus("com.sun.tools.javac", true);
0N/A return Class.forName(defaultJavaCompilerName, false, cl);
0N/A }
0N/A
0N/A private static Class<?> enableAsserts(Class<?> cls) {
0N/A try {
0N/A ClassLoader loader = cls.getClassLoader();
0N/A if (loader != null)
0N/A loader.setPackageAssertionStatus("com.sun.tools.javac", true);
0N/A else
0N/A trace(FINE, "loader == null");
0N/A } catch (SecurityException ex) {
0N/A trace(FINE, ex);
0N/A }
0N/A return cls;
0N/A }
0N/A }
0N/A}