/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.errorprone;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.sun.tools.javac.api.ClientCodeWrapper.Trusted;
import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.util.Context;
import java.net.URL;
import java.net.URLClassLoader;
import javax.tools.JavaFileManager;
/**
* A classloader that allows plugins to access the Error Prone classes from the compiler classpath.
*/
// TODO(cushon): consolidate with Bazel's ClassLoaderMaskingPlugin
public class MaskedClassLoader extends ClassLoader {
/**
* An alternative to {@link JavacFileManager#preRegister(Context)} that installs a {@link
* MaskedClassLoader}.
*/
public static void preRegisterFileManager(Context context) {
context.put(
JavaFileManager.class,
new Context.Factory<JavaFileManager>() {
@Override
public JavaFileManager make(Context c) {
return new MaskedFileManager(c);
}
});
}
public MaskedClassLoader(ClassLoader parent) {
super(parent);
}
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
if (name.startsWith("com.google.errorprone.")
|| name.startsWith("org.checkerframework.dataflow.")) {
return Class.forName(name);
} else {
throw new ClassNotFoundException(name);
}
}
@Trusted
static class MaskedFileManager extends JavacFileManager {
public MaskedFileManager(Context context) {
super(context, true, UTF_8);
}
public MaskedFileManager() {
this(new Context());
}
@Override
protected ClassLoader getClassLoader(URL[] urls) {
return new URLClassLoader(
urls, new MaskedClassLoader(JavacFileManager.class.getClassLoader()));
}
}
}