/*
 * Copyright (c) 2019, 2019, 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 com.oracle.svm.core;

// Checkstyle: allow reflection

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

import org.graalvm.nativeimage.Platform;
import org.graalvm.nativeimage.Platforms;

Wrapper for the InvocationHandler used by the JDK for annotations. During image generation, it makes the annotation properties available by delegating to the JDK invocation handler. At run time, the properties are stored directly in the annotation objects. See the hosted class AnnotationSupport for details. /**
 * Wrapper for the {@link InvocationHandler} used by the JDK for annotations. During image
 * generation, it makes the annotation properties available by delegating to the JDK invocation
 * handler. At run time, the properties are stored directly in the annotation objects. See the
 * hosted class AnnotationSupport for details.
 */
public final class SubstrateAnnotationInvocationHandler implements InvocationHandler {

    @Platforms(Platform.HOSTED_ONLY.class) //
    private final InvocationHandler hostedInvocationHandler;

    @Platforms(Platform.HOSTED_ONLY.class)
    public SubstrateAnnotationInvocationHandler(InvocationHandler hostedInvocationHandler) {
        this.hostedInvocationHandler = hostedInvocationHandler;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        if (SubstrateUtil.HOSTED) {
            return hostedInvocationHandler.invoke(proxy, method, args);
        } else {
            throw new IllegalArgumentException("InvocationHandler for annotations must not be used. Method: " + method.toString());
        }
    }
}