langtools/src/java.compiler/share/classes/javax/tools/ToolProvider.java
author jjg
Tue, 22 Nov 2016 16:29:24 -0800
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8155765: javax.tools.ToolProvider::getSystemToolClassLoader returns app class loader even if no tool is available Reviewed-by: mchung
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/*
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 * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package javax.tools;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.Iterator;
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import java.util.ServiceConfigurationError;
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import java.util.ServiceLoader;
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/**
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 * Provides methods for locating tool providers, for example,
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 * providers of compilers.  This class complements the
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 * functionality of {@link java.util.ServiceLoader}.
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 *
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 * @author Peter von der Ahé
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 * @since 1.6
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 */
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public class ToolProvider {
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    private static final String systemJavaCompilerModule = "jdk.compiler";
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    private static final String systemJavaCompilerName   = "com.sun.tools.javac.api.JavacTool";
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    /**
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     * Returns the Java™ programming language compiler provided
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     * with this platform.
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     * <p>The file manager returned by calling
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     * {@link JavaCompiler#getStandardFileManager getStandardFileManager}
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     * on this compiler supports paths provided by any
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     * {@linkplain java.nio.file.FileSystem filesystem}.</p>
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     * @return the compiler provided with this platform or
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     * {@code null} if no compiler is provided
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     * @implNote This implementation returns the compiler provided
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     * by the {@code jdk.compiler} module if that module is available,
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     * and {@code null} otherwise.
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     */
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    public static JavaCompiler getSystemJavaCompiler() {
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        return getSystemTool(JavaCompiler.class,
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                systemJavaCompilerModule, systemJavaCompilerName);
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    }
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    private static final String systemDocumentationToolModule = "jdk.javadoc";
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    private static final String systemDocumentationToolName = "jdk.javadoc.internal.api.JavadocTool";
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    /**
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     * Returns the Java&trade; programming language documentation tool provided
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     * with this platform.
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     * <p>The file manager returned by calling
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     * {@link DocumentationTool#getStandardFileManager getStandardFileManager}
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     * on this tool supports paths provided by any
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     * {@linkplain java.nio.file.FileSystem filesystem}.</p>
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     * @return the documentation tool provided with this platform or
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     * {@code null} if no documentation tool is provided
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     * @implNote This implementation returns the tool provided
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     * by the {@code jdk.javadoc} module if that module is available,
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     * and {@code null} otherwise.
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     */
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    public static DocumentationTool getSystemDocumentationTool() {
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        return getSystemTool(DocumentationTool.class,
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                systemDocumentationToolModule, systemDocumentationToolName);
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    }
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    /**
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     * Returns a class loader that may be used to load system tools,
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     * or {@code null} if no such special loader is provided.
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     * @implSpec This implementation always returns {@code null}.
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     * @deprecated This method is subject to removal in a future version of
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     * Java SE.
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     * Use the {@link java.util.spi.ToolProvider system tool provider} or
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     * {@link java.util.ServiceLoader service loader} mechanisms to
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     * locate system tools as well as user-installed tools.
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     * @return a class loader, or {@code null}
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     */
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    @Deprecated
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    public static ClassLoader getSystemToolClassLoader() {
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        return null;
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    }
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    private static final boolean useLegacy;
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    static {
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        Class<?> c = null;
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        try {
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            c = Class.forName("java.lang.reflect.Module");
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        } catch (Throwable t) {
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        }
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        useLegacy = (c == null);
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    }
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    /**
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     * Get an instance of a system tool using the service loader.
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     * @implNote         By default, this returns the implementation in the specified module.
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     *                   For limited backward compatibility, if this code is run on an older version
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     *                   of the Java platform that does not support modules, this method will
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     *                   try and create an instance of the named class. Note that implies the
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     *                   class must be available on the system class path.
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     * @param <T>        the interface of the tool
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     * @param clazz      the interface of the tool
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     * @param moduleName the name of the module containing the desired implementation
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     * @param className  the class name of the desired implementation
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     * @return the specified implementation of the tool
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     */
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    private static <T> T getSystemTool(Class<T> clazz, String moduleName, String className) {
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        if (useLegacy) {
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            try {
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                return Class.forName(className, true, ClassLoader.getSystemClassLoader()).
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                    asSubclass(clazz).getConstructor().newInstance();
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            } catch (ReflectiveOperationException e) {
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                throw new Error(e);
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            }
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        }
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        try {
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            ServiceLoader<T> sl = ServiceLoader.load(clazz, ClassLoader.getSystemClassLoader());
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            for (Iterator<T> iter = sl.iterator(); iter.hasNext(); ) {
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                T tool = iter.next();
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                if (matches(tool, moduleName))
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                    return tool;
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            }
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        } catch (ServiceConfigurationError e) {
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            throw new Error(e);
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        }
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        return null;
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    }
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    /**
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     * Determine if this is the desired tool instance.
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     * @param <T>        the interface of the tool
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     * @param tool       the instance of the tool
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     * @param moduleName the name of the module containing the desired implementation
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     * @return true if and only if the tool matches the specified criteria
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     */
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    private static <T> boolean matches(T tool, String moduleName) {
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        PrivilegedAction<Boolean> pa = () -> {
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            // for now, use reflection to implement
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            //      return moduleName.equals(tool.getClass().getModule().getName());
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            try {
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                Method getModuleMethod = Class.class.getDeclaredMethod("getModule");
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                Object toolModule = getModuleMethod.invoke(tool.getClass());
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                Method getNameMethod = toolModule.getClass().getDeclaredMethod("getName");
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                String toolModuleName = (String) getNameMethod.invoke(toolModule);
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                return moduleName.equals(toolModuleName);
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            } catch (InvocationTargetException | NoSuchMethodException | IllegalAccessException e) {
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                return false;
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            }
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        };
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        return AccessController.doPrivileged(pa);
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    }
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06bc494ca11e Initial load
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}