/*

 * Copyright (c) 2010, 2013, 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

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 */

/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file, and Oracle licenses the original version of this file under the BSD

 * license:

 */

/*

   Copyright 2009-2013 Attila Szegedi

*/

package jdk.dynalink.support;

import java.lang.invoke.CallSite;

import java.lang.invoke.MethodHandle;

import java.lang.invoke.MutableCallSite;

import jdk.dynalink.CallSiteDescriptor;

import jdk.dynalink.RelinkableCallSite;

import jdk.dynalink.linker.GuardedInvocation;

/**

 * A basic implementation of the {@link RelinkableCallSite} as a

 * {@link MutableCallSite}. It carries a {@link CallSiteDescriptor} passed in

 * the constructor and provides the correct implementation of the

 * {@link #initialize(MethodHandle)} method. Subclasses must provide

 * {@link #relink(GuardedInvocation, MethodHandle)} and

 * {@link #resetAndRelink(GuardedInvocation, MethodHandle)}

 * methods.

 */

public abstract class AbstractRelinkableCallSite extends MutableCallSite implements RelinkableCallSite {

    private final CallSiteDescriptor descriptor;

    /**

     * Creates a new abstract relinkable call site.

     * @param descriptor the descriptor for this call site that will be returned

     * from {@link #getDescriptor()}. The call site's {@link CallSite#type()}

     * will be equal to descriptor's {@link CallSiteDescriptor#getMethodType()}.

     * @throws NullPointerException if {@code descriptor} is null.

     */

    protected AbstractRelinkableCallSite(final CallSiteDescriptor descriptor) {

        super(descriptor.getMethodType());

        this.descriptor = descriptor;

    }

    @Override

    public CallSiteDescriptor getDescriptor() {

        return descriptor;

    }

    @Override

    public void initialize(final MethodHandle relinkAndInvoke) {

        setTarget(relinkAndInvoke);

    }

}