src.jdk.compiler.share.classes.com.sun.tools.doclint.DocLint Maven / Gradle / Ivy
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/*
* Copyright (c) 2020, 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.doclint;
import java.util.ServiceLoader;
import com.sun.source.util.JavacTask;
import com.sun.source.util.Plugin;
import java.lang.reflect.Method;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Objects;
import java.util.ServiceConfigurationError;
import java.util.function.Supplier;
import java.util.stream.Stream;
/**
* The base class for the DocLint service used by javac.
*
*
* 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.
*/
public abstract class DocLint implements Plugin {
public static final String XMSGS_OPTION = "-Xmsgs";
public static final String XMSGS_CUSTOM_PREFIX = "-Xmsgs:";
public static final String XCHECK_PACKAGE = "-XcheckPackage:";
public abstract boolean isValidOption(String opt);
public static synchronized DocLint newDocLint() {
Provider provider = new Provider() {
@Override
public Class type() {
return NoDocLint.class;
}
@Override
public DocLint get() {
return new NoDocLint();
}
};
for (DocLint docLint : ServiceLoader.load(DocLint.class, ClassLoader.getSystemClassLoader())) {
if (docLint.getName().equals("doclint")) {
return docLint;
}
}
return provider.get();
}
private static class NoDocLint extends DocLint {
@Override
public String getName() {
return "doclint-not-available";
}
@Override
public void init(JavacTask task, String... args) {
throw new IllegalStateException("doclint not available");
}
@Override
public boolean isValidOption(String s) {
// passively accept all "plausible" options
return s.equals(XMSGS_OPTION)
|| s.startsWith(XMSGS_CUSTOM_PREFIX)
|| s.startsWith(XCHECK_PACKAGE);
}
}
/**
* A Provider implementation that supports invoking, with reduced
* permissions, the static factory to obtain the provider or the provider's
* no-arg constructor.
*/
public static interface Provider extends Supplier {
/**
* Returns the provider type. There is no guarantee that this type is
* accessible or that it has a public no-args constructor. The {@link
* #get() get()} method should be used to obtain the provider instance.
*
*
* When a module declares that the provider class is created by a
* provider factory then this method returns the return type of its
* public static "{@code provider()}" method.
*
* @return The provider type
*/
Class type();
/**
* Returns an instance of the provider.
*
* @return An instance of the provider.
*
* @throws ServiceConfigurationError If the service provider cannot be
* instantiated, or in the case of a provider factory, the public static
* "{@code provider()}" method returns {@code null} or throws an error
* or exception. The {@code ServiceConfigurationError} will carry an
* appropriate cause where possible.
*/
@Override
S get();
}
private static class ProviderImpl implements Provider {
final Class service;
final Class type;
final Method factoryMethod; // factory method or null
final Constructor ctor; // public no-args constructor or null
final AccessControlContext acc;
ProviderImpl(Class service,
Class type,
Method factoryMethod,
AccessControlContext acc) {
this.service = service;
this.type = type;
this.factoryMethod = factoryMethod;
this.ctor = null;
this.acc = acc;
}
ProviderImpl(Class service,
Class type,
Constructor ctor,
AccessControlContext acc) {
this.service = service;
this.type = type;
this.factoryMethod = null;
this.ctor = ctor;
this.acc = acc;
}
@Override
public Class type() {
return type;
}
@Override
public S get() {
if (factoryMethod != null) {
return invokeFactoryMethod();
} else {
return newInstance();
}
}
/**
* Invokes the provider's "provider" method to instantiate a provider.
* When running with a security manager then the method runs with
* permissions that are restricted by the security context of whatever
* created this loader.
*/
private S invokeFactoryMethod() {
Object result = null;
Throwable exc = null;
if (acc == null) {
try {
result = factoryMethod.invoke(null);
} catch (Throwable x) {
exc = x;
}
} else {
PrivilegedExceptionAction pa = () -> factoryMethod.invoke(null);
// invoke factory method with permissions restricted by acc
try {
result = AccessController.doPrivileged(pa, acc);
} catch (Throwable x) {
if (x instanceof PrivilegedActionException) {
x = x.getCause();
}
exc = x;
}
}
if (exc != null) {
if (exc instanceof InvocationTargetException) {
exc = exc.getCause();
}
fail(service, factoryMethod + " failed", exc);
}
if (result == null) {
fail(service, factoryMethod + " returned null");
}
@SuppressWarnings("unchecked")
S p = (S) result;
return p;
}
/**
* Invokes Constructor::newInstance to instantiate a provider. When
* running with a security manager then the constructor runs with
* permissions that are restricted by the security context of whatever
* created this loader.
*/
private S newInstance() {
S p = null;
Throwable exc = null;
if (acc == null) {
try {
p = ctor.newInstance();
} catch (Throwable x) {
exc = x;
}
} else {
PrivilegedExceptionAction pa = new PrivilegedExceptionAction() {
@Override
public S run() throws Exception {
return ctor.newInstance();
}
};
// invoke constructor with permissions restricted by acc
try {
p = AccessController.doPrivileged(pa, acc);
} catch (Throwable x) {
if (x instanceof PrivilegedActionException) {
x = x.getCause();
}
exc = x;
}
}
if (exc != null) {
if (exc instanceof InvocationTargetException) {
exc = exc.getCause();
}
String cn = ctor.getDeclaringClass().getName();
fail(service,
"Provider " + cn + " could not be instantiated", exc);
}
return p;
}
// For now, equals/hashCode uses the access control context to ensure
// that two Providers created with different contexts are not equal
// when running with a security manager.
@Override
public int hashCode() {
return Objects.hash(service, type, acc);
}
@Override
public boolean equals(Object ob) {
if (!(ob instanceof ProviderImpl)) {
return false;
}
@SuppressWarnings("unchecked")
ProviderImpl that = (ProviderImpl) ob;
return this.service == that.service
&& this.type == that.type
&& Objects.equals(this.acc, that.acc);
}
private static void fail(Class service, String msg, Throwable cause)
throws ServiceConfigurationError {
throw new ServiceConfigurationError(service.getName() + ": " + msg,
cause);
}
private static void fail(Class service, String msg)
throws ServiceConfigurationError {
throw new ServiceConfigurationError(service.getName() + ": " + msg);
}
private static void fail(Class service, URL u, int line, String msg)
throws ServiceConfigurationError {
fail(service, u + ":" + line + ": " + msg);
}
}
}