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FilteringClassLoaderInjectingInvocationHandler.java
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FilteringClassLoaderInjectingInvocationHandler.java
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/*
* Copyright 2019 the original author or authors.
*
* 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 org.gradle.api.internal.tasks.compile.reflect;
import javax.tools.StandardLocation;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.net.URLClassLoader;
import static org.gradle.api.internal.tasks.compile.filter.AnnotationProcessorFilter.getFilteredClassLoader;
/**
* This class injects a filtering classloader when the compiler uses the standard java annotation processor path.
* This prevents Gradle classes or external libraries from being visible on the annotation processor path.
*/
public class FilteringClassLoaderInjectingInvocationHandler implements InvocationHandler {
public static final String GET_CLASS_LOADER = "getClassLoader";
private final Object proxied;
public FilteringClassLoaderInjectingInvocationHandler(Object proxied) {
this.proxied = proxied;
}
@Override
@SuppressWarnings("unchecked")
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getName().equals(GET_CLASS_LOADER) && args[0] == StandardLocation.ANNOTATION_PROCESSOR_PATH) {
ClassLoader classLoader = (ClassLoader) method.invoke(proxied, args);
if (classLoader instanceof URLClassLoader) {
return new URLClassLoader(((URLClassLoader) classLoader).getURLs(), getFilteredClassLoader(classLoader.getParent()));
} else {
return classLoader;
}
}
return method.invoke(proxied, args);
}
}