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SourcepathIgnoringInvocationHandler.java
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SourcepathIgnoringInvocationHandler.java
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/*
* Copyright 2017 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.JavaFileObject;
import javax.tools.StandardLocation;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.Set;
/**
* Intercepts JavaFileManager calls to ignore files on the sourcepath.
*/
public class SourcepathIgnoringInvocationHandler implements InvocationHandler {
private static final String HAS_LOCATION_METHOD = "hasLocation";
private static final String LIST_METHOD = "list";
private final Object proxied;
public SourcepathIgnoringInvocationHandler(Object proxied) {
this.proxied = proxied;
}
@Override
@SuppressWarnings("unchecked")
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getName().equals(HAS_LOCATION_METHOD)) {
// There is currently a requirement in the JDK9 javac implementation
// that when javac is invoked with an explicitly empty sourcepath
// (i.e. {@code --sourcepath ""}), it won't allow you to compile a java 9
// module. However, we really want to explicitly set an empty sourcepath
// so that we don't implicitly pull in unrequested sourcefiles which
// haven't been snapshotted because we will consider the task up-to-date
// if the implicit files change.
//
// This implementation of hasLocation() pretends that the JavaFileManager
// has no concept of a source path.
if (args[0].equals(StandardLocation.SOURCE_PATH)) {
return false;
}
}
if (method.getName().equals(LIST_METHOD)) {
// If we are pretending that we don't have a sourcepath, the compiler will
// look on the classpath for sources. Since we don't want to bring in any
// sources implicitly from the classpath, we have to ignore source files
// found on the classpath.
if (args[0].equals(StandardLocation.CLASS_PATH)) {
((Set<JavaFileObject.Kind>) args[2]).remove(JavaFileObject.Kind.SOURCE);
}
}
return method.invoke(proxied, args);
}
}