com.sun.tools.javadoc.main.DocletInvoker Maven / Gradle / Ivy
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/*
* Copyright (c) 1998, 2016, 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 com.sun.tools.javadoc.main;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.regex.Pattern;
import javax.tools.DocumentationTool;
import javax.tools.JavaFileManager;
import com.sun.javadoc.*;
import com.sun.tools.javac.util.ClientCodeException;
import com.sun.tools.javac.util.List;
/**
* Class creates, controls and invokes doclets.
*
* This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.
*
* @author Neal Gafter (rewrite)
*/
@Deprecated
public class DocletInvoker {
private final Class docletClass;
private final String docletClassName;
private final ClassLoader appClassLoader;
private final Messager messager;
/**
* In API mode, exceptions thrown while calling the doclet are
* propagated using ClientCodeException.
*/
private final boolean apiMode;
/**
* Whether javadoc internal API should be exported to doclets
* and (indirectly) to taglets
*/
private final boolean exportInternalAPI;
private static class DocletInvokeException extends Exception {
private static final long serialVersionUID = 0;
}
private String appendPath(String path1, String path2) {
if (path1 == null || path1.length() == 0) {
return path2 == null ? "." : path2;
} else if (path2 == null || path2.length() == 0) {
return path1;
} else {
return path1 + File.pathSeparator + path2;
}
}
public DocletInvoker(Messager messager, Class docletClass, boolean apiMode, boolean exportInternalAPI) {
this.messager = messager;
this.docletClass = docletClass;
docletClassName = docletClass.getName();
appClassLoader = null;
this.apiMode = apiMode;
this.exportInternalAPI = exportInternalAPI; // for backdoor use by standard doclet for taglets
// this may not be soon enough if the class has already been loaded
if (exportInternalAPI) {
exportInternalAPI(docletClass.getClassLoader());
}
}
public DocletInvoker(Messager messager, JavaFileManager fileManager,
String docletClassName, String docletPath,
ClassLoader docletParentClassLoader,
boolean apiMode,
boolean exportInternalAPI) {
this.messager = messager;
this.docletClassName = docletClassName;
this.apiMode = apiMode;
this.exportInternalAPI = exportInternalAPI; // for backdoor use by standard doclet for taglets
if (fileManager != null && fileManager.hasLocation(DocumentationTool.Location.DOCLET_PATH)) {
appClassLoader = fileManager.getClassLoader(DocumentationTool.Location.DOCLET_PATH);
} else {
// construct class loader
String cpString = null; // make sure env.class.path defaults to dot
// do prepends to get correct ordering
cpString = appendPath(System.getProperty("env.class.path"), cpString);
cpString = appendPath(System.getProperty("java.class.path"), cpString);
cpString = appendPath(docletPath, cpString);
URL[] urls = pathToURLs(cpString);
if (docletParentClassLoader == null)
appClassLoader = new URLClassLoader(urls, getDelegationClassLoader(docletClassName));
else
appClassLoader = new URLClassLoader(urls, docletParentClassLoader);
}
if (exportInternalAPI) {
exportInternalAPI(appClassLoader);
}
// attempt to find doclet
Class dc = null;
try {
dc = appClassLoader.loadClass(docletClassName);
} catch (ClassNotFoundException exc) {
messager.error(Messager.NOPOS, "main.doclet_class_not_found", docletClassName);
messager.exit();
}
docletClass = dc;
}
/*
* Returns the delegation class loader to use when creating
* appClassLoader (used to load the doclet). The context class
* loader is the best choice, but legacy behavior was to use the
* default delegation class loader (aka system class loader).
*
* Here we favor using the context class loader. To ensure
* compatibility with existing apps, we revert to legacy
* behavior if either or both of the following conditions hold:
*
* 1) the doclet is loadable from the system class loader but not
* from the context class loader,
*
* 2) this.getClass() is loadable from the system class loader but not
* from the context class loader.
*/
private ClassLoader getDelegationClassLoader(String docletClassName) {
ClassLoader ctxCL = Thread.currentThread().getContextClassLoader();
ClassLoader sysCL = ClassLoader.getSystemClassLoader();
if (sysCL == null)
return ctxCL;
if (ctxCL == null)
return sysCL;
// Condition 1.
try {
sysCL.loadClass(docletClassName);
try {
ctxCL.loadClass(docletClassName);
} catch (ClassNotFoundException e) {
return sysCL;
}
} catch (ClassNotFoundException e) {
}
// Condition 2.
try {
if (getClass() == sysCL.loadClass(getClass().getName())) {
try {
if (getClass() != ctxCL.loadClass(getClass().getName()))
return sysCL;
} catch (ClassNotFoundException e) {
return sysCL;
}
}
} catch (ClassNotFoundException e) {
}
return ctxCL;
}
/**
* Generate documentation here. Return true on success.
*/
public boolean start(RootDoc root) {
Object retVal;
String methodName = "start";
Class[] paramTypes = { RootDoc.class };
Object[] params = { root };
try {
retVal = invoke(methodName, null, paramTypes, params);
} catch (DocletInvokeException exc) {
return false;
}
if (retVal instanceof Boolean) {
return ((Boolean)retVal);
} else {
messager.error(Messager.NOPOS, "main.must_return_boolean",
docletClassName, methodName);
return false;
}
}
/**
* Check for doclet added options here. Zero return means
* option not known. Positive value indicates number of
* arguments to option. Negative value means error occurred.
*/
public int optionLength(String option) {
Object retVal;
String methodName = "optionLength";
Class[] paramTypes = { String.class };
Object[] params = { option };
try {
retVal = invoke(methodName, 0, paramTypes, params);
} catch (DocletInvokeException exc) {
return -1;
}
if (retVal instanceof Integer) {
return ((Integer)retVal);
} else {
messager.error(Messager.NOPOS, "main.must_return_int",
docletClassName, methodName);
return -1;
}
}
/**
* Let doclet check that all options are OK. Returning true means
* options are OK. If method does not exist, assume true.
*/
public boolean validOptions(List optlist) {
Object retVal;
String options[][] = optlist.toArray(new String[optlist.length()][]);
String methodName = "validOptions";
DocErrorReporter reporter = messager;
Class[] paramTypes = { String[][].class, DocErrorReporter.class };
Object[] params = { options, reporter };
try {
retVal = invoke(methodName, Boolean.TRUE, paramTypes, params);
} catch (DocletInvokeException exc) {
return false;
}
if (retVal instanceof Boolean) {
return ((Boolean)retVal);
} else {
messager.error(Messager.NOPOS, "main.must_return_boolean",
docletClassName, methodName);
return false;
}
}
/**
* Return the language version supported by this doclet.
* If the method does not exist in the doclet, assume version 1.1.
*/
public LanguageVersion languageVersion() {
try {
Object retVal;
String methodName = "languageVersion";
Class[] paramTypes = new Class[0];
Object[] params = new Object[0];
try {
retVal = invoke(methodName, LanguageVersion.JAVA_1_1, paramTypes, params);
} catch (DocletInvokeException exc) {
return LanguageVersion.JAVA_1_1;
}
if (retVal instanceof LanguageVersion) {
return (LanguageVersion)retVal;
} else {
messager.error(Messager.NOPOS, "main.must_return_languageversion",
docletClassName, methodName);
return LanguageVersion.JAVA_1_1;
}
} catch (NoClassDefFoundError ex) { // for boostrapping, no Enum class.
return null;
}
}
/**
* Utility method for calling doclet functionality
*/
private Object invoke(String methodName, Object returnValueIfNonExistent,
Class[] paramTypes, Object[] params)
throws DocletInvokeException {
Method meth;
try {
meth = docletClass.getMethod(methodName, paramTypes);
} catch (NoSuchMethodException exc) {
if (returnValueIfNonExistent == null) {
messager.error(Messager.NOPOS, "main.doclet_method_not_found",
docletClassName, methodName);
throw new DocletInvokeException();
} else {
return returnValueIfNonExistent;
}
} catch (SecurityException exc) {
messager.error(Messager.NOPOS, "main.doclet_method_not_accessible",
docletClassName, methodName);
throw new DocletInvokeException();
}
if (!Modifier.isStatic(meth.getModifiers())) {
messager.error(Messager.NOPOS, "main.doclet_method_must_be_static",
docletClassName, methodName);
throw new DocletInvokeException();
}
ClassLoader savedCCL =
Thread.currentThread().getContextClassLoader();
try {
if (appClassLoader != null) // will be null if doclet class provided via API
Thread.currentThread().setContextClassLoader(appClassLoader);
return meth.invoke(null , params);
} catch (IllegalArgumentException | NullPointerException exc) {
messager.error(Messager.NOPOS, "main.internal_error_exception_thrown",
docletClassName, methodName, exc.toString());
throw new DocletInvokeException();
} catch (IllegalAccessException exc) {
messager.error(Messager.NOPOS, "main.doclet_method_not_accessible",
docletClassName, methodName);
throw new DocletInvokeException();
}
catch (InvocationTargetException exc) {
Throwable err = exc.getTargetException();
if (apiMode)
throw new ClientCodeException(err);
if (err instanceof java.lang.OutOfMemoryError) {
messager.error(Messager.NOPOS, "main.out.of.memory");
} else {
messager.error(Messager.NOPOS, "main.exception_thrown",
docletClassName, methodName, exc.toString());
exc.getTargetException().printStackTrace(System.err);
}
throw new DocletInvokeException();
} finally {
Thread.currentThread().setContextClassLoader(savedCCL);
}
}
/**
* Export javadoc internal API to the unnamed module for a classloader.
* This is to support continued use of existing non-standard doclets that
* use the internal toolkit API and related classes.
* @param cl the classloader
*/
private void exportInternalAPI(ClassLoader cl) {
String[] packages = {
"com.sun.tools.doclets",
"com.sun.tools.doclets.standard",
"com.sun.tools.doclets.internal.toolkit",
"com.sun.tools.doclets.internal.toolkit.taglets",
"com.sun.tools.doclets.internal.toolkit.builders",
"com.sun.tools.doclets.internal.toolkit.util",
"com.sun.tools.doclets.internal.toolkit.util.links",
"com.sun.tools.doclets.formats.html",
"com.sun.tools.doclets.formats.html.markup"
};
try {
Method getModuleMethod = Class.class.getDeclaredMethod("getModule");
Object thisModule = getModuleMethod.invoke(getClass());
Class moduleClass = Class.forName("java.lang.reflect.Module");
Method addExportsMethod = moduleClass.getDeclaredMethod("addExports", String.class, moduleClass);
Method getUnnamedModuleMethod = ClassLoader.class.getDeclaredMethod("getUnnamedModule");
Object target = getUnnamedModuleMethod.invoke(cl);
for (String pack : packages) {
addExportsMethod.invoke(thisModule, pack, target);
}
} catch (Exception e) {
// do nothing
}
}
/**
* Utility method for converting a search path string to an array of directory and JAR file
* URLs.
*
* Note that this method is called by the DocletInvoker.
*
* @param path the search path string
* @return the resulting array of directory and JAR file URLs
*/
private static URL[] pathToURLs(String path) {
java.util.List urls = new ArrayList<>();
for (String s: path.split(Pattern.quote(File.pathSeparator))) {
if (!s.isEmpty()) {
URL url = fileToURL(Paths.get(s));
if (url != null) {
urls.add(url);
}
}
}
return urls.toArray(new URL[urls.size()]);
}
/**
* Returns the directory or JAR file URL corresponding to the specified local file name.
*
* @param file the Path object
* @return the resulting directory or JAR file URL, or null if unknown
*/
private static URL fileToURL(Path file) {
Path p;
try {
p = file.toRealPath();
} catch (IOException e) {
p = file.toAbsolutePath();
}
try {
return p.normalize().toUri().toURL();
} catch (MalformedURLException e) {
return null;
}
}
}