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/*
* Copyright (c) 2001, 2021, 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 jdk.internal.reflect;
import jdk.internal.vm.annotation.Stable;
import java.lang.reflect.InvocationTargetException;
import java.util.Objects;
/** Delegates its invocation to another MethodAccessorImpl and can
change its delegate at run time. */
class DelegatingMethodAccessorImpl extends MethodAccessorImpl {
// initial non-null delegate
private final MethodAccessorImpl initialDelegate;
// alternative delegate: starts as null;
// only single change from null -> non-null is guaranteed
@Stable
private MethodAccessorImpl altDelegate;
DelegatingMethodAccessorImpl(MethodAccessorImpl delegate) {
initialDelegate = Objects.requireNonNull(delegate);
}
@Override
public Object invoke(Object obj, Object[] args)
throws IllegalArgumentException, InvocationTargetException
{
return delegate().invoke(obj, args);
}
@Override
public Object invoke(Object obj, Object[] args, Class<?> caller)
throws IllegalArgumentException, InvocationTargetException
{
return delegate().invoke(obj, args, caller);
}
private MethodAccessorImpl delegate() {
var d = altDelegate;
return d != null ? d : initialDelegate;
}
void setDelegate(MethodAccessorImpl delegate) {
altDelegate = Objects.requireNonNull(delegate);
}
}
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