langtools/src/jdk.javadoc/share/classes/com/sun/tools/javadoc/main/DocletInvoker.java
author alanb
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permissions -rw-r--r--
8177530: Module system implementation refresh (4/2017) Reviewed-by: jjg Contributed-by: alan.bateman@oracle.com, jan.lahoda@oracle.com
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/*
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 * Copyright (c) 1998, 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 com.sun.tools.javadoc.main;
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import java.io.File;
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import java.io.IOException;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.ArrayList;
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import java.util.regex.Pattern;
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import javax.tools.DocumentationTool;
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import javax.tools.JavaFileManager;
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import com.sun.javadoc.*;
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import com.sun.tools.javac.util.ClientCodeException;
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import com.sun.tools.javac.util.List;
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/**
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 * Class creates, controls and invokes doclets.
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 *
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 *  <p><b>This is NOT part of any supported API.
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 *  If you write code that depends on this, you do so at your own risk.
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 *  This code and its internal interfaces are subject to change or
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 *  deletion without notice.</b>
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 *
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 * @author Neal Gafter (rewrite)
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 */
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@Deprecated
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public class DocletInvoker {
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    private final Class<?> docletClass;
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    private final String docletClassName;
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    private final ClassLoader appClassLoader;
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    private final Messager messager;
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    /**
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     * In API mode, exceptions thrown while calling the doclet are
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     * propagated using ClientCodeException.
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     */
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    private final boolean apiMode;
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    /**
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     * Whether javadoc internal API should be exported to doclets
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     * and (indirectly) to taglets
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     */
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    private final boolean exportInternalAPI;
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    private static class DocletInvokeException extends Exception {
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        private static final long serialVersionUID = 0;
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    }
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    private String appendPath(String path1, String path2) {
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        if (path1 == null || path1.length() == 0) {
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            return path2 == null ? "." : path2;
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        } else if (path2 == null || path2.length() == 0) {
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            return path1;
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        } else {
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            return path1  + File.pathSeparator + path2;
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        }
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    }
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    public DocletInvoker(Messager messager, Class<?> docletClass, boolean apiMode, boolean exportInternalAPI) {
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        this.messager = messager;
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        this.docletClass = docletClass;
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        docletClassName = docletClass.getName();
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        appClassLoader = null;
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        this.apiMode = apiMode;
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        this.exportInternalAPI = exportInternalAPI; // for backdoor use by standard doclet for taglets
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        // this may not be soon enough if the class has already been loaded
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        if (exportInternalAPI) {
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            exportInternalAPI(docletClass.getClassLoader());
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        }
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    }
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    public DocletInvoker(Messager messager, JavaFileManager fileManager,
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                         String docletClassName, String docletPath,
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                         ClassLoader docletParentClassLoader,
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                         boolean apiMode,
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                         boolean exportInternalAPI) {
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        this.messager = messager;
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        this.docletClassName = docletClassName;
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        this.apiMode = apiMode;
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        this.exportInternalAPI = exportInternalAPI; // for backdoor use by standard doclet for taglets
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        if (fileManager != null && fileManager.hasLocation(DocumentationTool.Location.DOCLET_PATH)) {
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            appClassLoader = fileManager.getClassLoader(DocumentationTool.Location.DOCLET_PATH);
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        } else {
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            // construct class loader
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            String cpString = null;   // make sure env.class.path defaults to dot
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            // do prepends to get correct ordering
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            cpString = appendPath(System.getProperty("env.class.path"), cpString);
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            cpString = appendPath(System.getProperty("java.class.path"), cpString);
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            cpString = appendPath(docletPath, cpString);
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            URL[] urls = pathToURLs(cpString);
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            if (docletParentClassLoader == null)
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                appClassLoader = new URLClassLoader(urls, getDelegationClassLoader(docletClassName));
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            else
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                appClassLoader = new URLClassLoader(urls, docletParentClassLoader);
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        }
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        if (exportInternalAPI) {
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            exportInternalAPI(appClassLoader);
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        }
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        // attempt to find doclet
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        Class<?> dc = null;
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        try {
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            dc = appClassLoader.loadClass(docletClassName);
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        } catch (ClassNotFoundException exc) {
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            messager.error(Messager.NOPOS, "main.doclet_class_not_found", docletClassName);
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            messager.exit();
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        }
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        docletClass = dc;
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    }
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    /*
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     * Returns the delegation class loader to use when creating
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     * appClassLoader (used to load the doclet).  The context class
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     * loader is the best choice, but legacy behavior was to use the
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     * default delegation class loader (aka system class loader).
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     *
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     * Here we favor using the context class loader.  To ensure
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     * compatibility with existing apps, we revert to legacy
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     * behavior if either or both of the following conditions hold:
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     *
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     * 1) the doclet is loadable from the system class loader but not
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     *    from the context class loader,
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     *
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     * 2) this.getClass() is loadable from the system class loader but not
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     *    from the context class loader.
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     */
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    private ClassLoader getDelegationClassLoader(String docletClassName) {
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        ClassLoader ctxCL = Thread.currentThread().getContextClassLoader();
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        ClassLoader sysCL = ClassLoader.getSystemClassLoader();
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        if (sysCL == null)
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            return ctxCL;
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        if (ctxCL == null)
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            return sysCL;
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        // Condition 1.
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        try {
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            sysCL.loadClass(docletClassName);
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            try {
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                ctxCL.loadClass(docletClassName);
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            } catch (ClassNotFoundException e) {
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                return sysCL;
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            }
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        } catch (ClassNotFoundException e) {
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        }
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        // Condition 2.
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        try {
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            if (getClass() == sysCL.loadClass(getClass().getName())) {
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                try {
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                    if (getClass() != ctxCL.loadClass(getClass().getName()))
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                        return sysCL;
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                } catch (ClassNotFoundException e) {
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                    return sysCL;
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                }
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            }
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        } catch (ClassNotFoundException e) {
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        }
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        return ctxCL;
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    }
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    /**
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     * Generate documentation here.  Return true on success.
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     */
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    public boolean start(RootDoc root) {
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        Object retVal;
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        String methodName = "start";
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        Class<?>[] paramTypes = { RootDoc.class };
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        Object[] params = { root };
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        try {
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            retVal = invoke(methodName, null, paramTypes, params);
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        } catch (DocletInvokeException exc) {
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            return false;
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        }
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        if (retVal instanceof Boolean) {
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            return ((Boolean)retVal);
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        } else {
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            messager.error(Messager.NOPOS, "main.must_return_boolean",
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                           docletClassName, methodName);
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            return false;
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        }
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    }
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    /**
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     * Check for doclet added options here. Zero return means
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     * option not known.  Positive value indicates number of
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     * arguments to option.  Negative value means error occurred.
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     */
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    public int optionLength(String option) {
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        Object retVal;
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        String methodName = "optionLength";
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        Class<?>[] paramTypes = { String.class };
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        Object[] params = { option };
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        try {
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            retVal = invoke(methodName, 0, paramTypes, params);
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        } catch (DocletInvokeException exc) {
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            return -1;
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        }
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        if (retVal instanceof Integer) {
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            return ((Integer)retVal);
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        } else {
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            messager.error(Messager.NOPOS, "main.must_return_int",
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                           docletClassName, methodName);
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            return -1;
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        }
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    }
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    /**
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     * Let doclet check that all options are OK. Returning true means
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     * options are OK.  If method does not exist, assume true.
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     */
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    public boolean validOptions(List<String[]> optlist) {
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        Object retVal;
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        String options[][] = optlist.toArray(new String[optlist.length()][]);
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        String methodName = "validOptions";
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        DocErrorReporter reporter = messager;
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        Class<?>[] paramTypes = { String[][].class, DocErrorReporter.class };
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        Object[] params = { options, reporter };
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        try {
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            retVal = invoke(methodName, Boolean.TRUE, paramTypes, params);
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        } catch (DocletInvokeException exc) {
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            return false;
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        }
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        if (retVal instanceof Boolean) {
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            return ((Boolean)retVal);
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        } else {
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            messager.error(Messager.NOPOS, "main.must_return_boolean",
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                           docletClassName, methodName);
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            return false;
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        }
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    }
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    /**
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     * Return the language version supported by this doclet.
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     * If the method does not exist in the doclet, assume version 1.1.
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     */
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    public LanguageVersion languageVersion() {
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        try {
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            Object retVal;
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            String methodName = "languageVersion";
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            Class<?>[] paramTypes = new Class<?>[0];
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            Object[] params = new Object[0];
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            try {
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                retVal = invoke(methodName, LanguageVersion.JAVA_1_1, paramTypes, params);
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            } catch (DocletInvokeException exc) {
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                return LanguageVersion.JAVA_1_1;
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            }
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            if (retVal instanceof LanguageVersion) {
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                return (LanguageVersion)retVal;
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            } else {
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                messager.error(Messager.NOPOS, "main.must_return_languageversion",
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                               docletClassName, methodName);
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                return LanguageVersion.JAVA_1_1;
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            }
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        } catch (NoClassDefFoundError ex) { // for boostrapping, no Enum class.
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            return null;
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        }
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    }
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    /**
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     * Utility method for calling doclet functionality
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     */
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    private Object invoke(String methodName, Object returnValueIfNonExistent,
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                          Class<?>[] paramTypes, Object[] params)
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        throws DocletInvokeException {
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            Method meth;
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            try {
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                meth = docletClass.getMethod(methodName, paramTypes);
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            } catch (NoSuchMethodException exc) {
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                if (returnValueIfNonExistent == null) {
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                    messager.error(Messager.NOPOS, "main.doclet_method_not_found",
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                                   docletClassName, methodName);
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                    throw new DocletInvokeException();
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                } else {
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                    return returnValueIfNonExistent;
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                }
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            } catch (SecurityException exc) {
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                messager.error(Messager.NOPOS, "main.doclet_method_not_accessible",
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                               docletClassName, methodName);
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                throw new DocletInvokeException();
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            }
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            if (!Modifier.isStatic(meth.getModifiers())) {
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                messager.error(Messager.NOPOS, "main.doclet_method_must_be_static",
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                               docletClassName, methodName);
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                throw new DocletInvokeException();
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            }
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            ClassLoader savedCCL =
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                Thread.currentThread().getContextClassLoader();
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            try {
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                if (appClassLoader != null) // will be null if doclet class provided via API
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                    Thread.currentThread().setContextClassLoader(appClassLoader);
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                return meth.invoke(null , params);
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            } catch (IllegalArgumentException | NullPointerException exc) {
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                messager.error(Messager.NOPOS, "main.internal_error_exception_thrown",
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                               docletClassName, methodName, exc.toString());
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                throw new DocletInvokeException();
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            } catch (IllegalAccessException exc) {
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                messager.error(Messager.NOPOS, "main.doclet_method_not_accessible",
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                               docletClassName, methodName);
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                throw new DocletInvokeException();
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            }
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            catch (InvocationTargetException exc) {
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                Throwable err = exc.getTargetException();
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                if (apiMode)
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                    throw new ClientCodeException(err);
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                if (err instanceof java.lang.OutOfMemoryError) {
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                    messager.error(Messager.NOPOS, "main.out.of.memory");
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                } else {
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                    messager.error(Messager.NOPOS, "main.exception_thrown",
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                               docletClassName, methodName, exc.toString());
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                    exc.getTargetException().printStackTrace(System.err);
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                }
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                throw new DocletInvokeException();
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            } finally {
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                Thread.currentThread().setContextClassLoader(savedCCL);
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            }
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    }
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   358
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    /**
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     * Export javadoc internal API to the unnamed module for a classloader.
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     * This is to support continued use of existing non-standard doclets that
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     * use the internal toolkit API and related classes.
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     * @param cl the classloader
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   364
     */
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    private void exportInternalAPI(ClassLoader cl) {
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        String[] packages = {
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            "com.sun.tools.doclets",
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            "com.sun.tools.doclets.standard",
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            "com.sun.tools.doclets.internal.toolkit",
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   370
            "com.sun.tools.doclets.internal.toolkit.taglets",
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            "com.sun.tools.doclets.internal.toolkit.builders",
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            "com.sun.tools.doclets.internal.toolkit.util",
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   373
            "com.sun.tools.doclets.internal.toolkit.util.links",
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   374
            "com.sun.tools.doclets.formats.html",
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   375
            "com.sun.tools.doclets.formats.html.markup"
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        };
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   378
        try {
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            Method getModuleMethod = Class.class.getDeclaredMethod("getModule");
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            Object thisModule = getModuleMethod.invoke(getClass());
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   381
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            Class<?> moduleClass = Class.forName("java.lang.Module");
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            Method addExportsMethod = moduleClass.getDeclaredMethod("addExports", String.class, moduleClass);
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   384
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   385
            Method getUnnamedModuleMethod = ClassLoader.class.getDeclaredMethod("getUnnamedModule");
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   386
            Object target = getUnnamedModuleMethod.invoke(cl);
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   387
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   388
            for (String pack : packages) {
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   389
                addExportsMethod.invoke(thisModule, pack, target);
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   390
            }
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   391
        } catch (Exception e) {
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   392
            // do nothing
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   393
        }
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diff changeset
   394
    }
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diff changeset
   395
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   396
    /**
28707
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   397
     * Utility method for converting a search path string to an array of directory and JAR file
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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diff changeset
   398
     * URLs.
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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diff changeset
   399
     *
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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diff changeset
   400
     * Note that this method is called by the DocletInvoker.
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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parents: 25874
diff changeset
   401
     *
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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parents: 25874
diff changeset
   402
     * @param path the search path string
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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parents: 25874
diff changeset
   403
     * @return the resulting array of directory and JAR file URLs
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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parents: 25874
diff changeset
   404
     */
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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parents: 25874
diff changeset
   405
    private static URL[] pathToURLs(String path) {
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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parents: 25874
diff changeset
   406
        java.util.List<URL> urls = new ArrayList<>();
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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parents: 25874
diff changeset
   407
        for (String s: path.split(Pattern.quote(File.pathSeparator))) {
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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diff changeset
   408
            if (!s.isEmpty()) {
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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diff changeset
   409
                URL url = fileToURL(Paths.get(s));
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   410
                if (url != null) {
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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diff changeset
   411
                    urls.add(url);
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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diff changeset
   412
                }
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   413
            }
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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parents: 25874
diff changeset
   414
        }
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   415
        return urls.toArray(new URL[urls.size()]);
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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parents: 25874
diff changeset
   416
    }
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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parents: 25874
diff changeset
   417
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   418
    /**
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
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diff changeset
   419
     * Returns the directory or JAR file URL corresponding to the specified local file name.
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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diff changeset
   420
     *
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   421
     * @param file the Path object
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   422
     * @return the resulting directory or JAR file URL, or null if unknown
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   423
     */
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
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parents: 25874
diff changeset
   424
    private static URL fileToURL(Path file) {
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   425
        Path p;
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   426
        try {
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   427
            p = file.toRealPath();
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   428
        } catch (IOException e) {
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   429
            p = file.toAbsolutePath();
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   430
        }
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   431
        try {
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   432
            return p.normalize().toUri().toURL();
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   433
        } catch (MalformedURLException e) {
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   434
            return null;
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
parents: 25874
diff changeset
   435
        }
2ec91c67b30b 8071617: move pathToURLs from javac.file.Locations to javadoc.DocletInvoker
jjg
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diff changeset
   436
    }
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   437
}