org.codehaus.groovy.vmplugin.v7.Java7 Maven / Gradle / Ivy
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Groovy: A powerful, dynamic language for the JVM
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.codehaus.groovy.vmplugin.v7;
import org.codehaus.groovy.GroovyBugError;
import org.codehaus.groovy.vmplugin.v6.Java6;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* Java 7 based functions. Currently just a stub but you can
* add your own methods to your own version and place it on the classpath
* ahead of this one.
*
* @author Jochen Theodorou
*/
public class Java7 extends Java6 {
private static final Constructor LOOKUP_Constructor;
static {
Constructor con = null;
try {
con = MethodHandles.Lookup.class.getDeclaredConstructor(Class.class, int.class);
} catch (NoSuchMethodException e) {
throw new GroovyBugError(e);
}
try {
if (!con.isAccessible()) {
final Constructor tmp = con;
AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
tmp.setAccessible(true);
return null;
}
});
}
} catch (SecurityException se) {
con = null;
}
LOOKUP_Constructor = con;
}
@Override
public void invalidateCallSites() {
IndyInterface.invalidateSwitchPoints();
}
@Override
public int getVersion() {
return 7;
}
@Override
public Object getInvokeSpecialHandle(final Method method, final Object receiver) {
if (LOOKUP_Constructor==null) {
return super.getInvokeSpecialHandle(method, receiver);
}
if (!method.isAccessible()) {
AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
method.setAccessible(true);
return null;
}
});
}
Class declaringClass = method.getDeclaringClass();
try {
return LOOKUP_Constructor.
newInstance(declaringClass, MethodHandles.Lookup.PRIVATE).
unreflectSpecial(method, declaringClass).
bindTo(receiver);
} catch (ReflectiveOperationException e) {
throw new GroovyBugError(e);
}
}
@Override
public Object invokeHandle(Object handle, Object[] args) throws Throwable {
MethodHandle mh = (MethodHandle) handle;
return mh.invokeWithArguments(args);
}
}