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/*
 * Copyright (c) 2016, 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.truffle.api.interop;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import com.oracle.truffle.api.frame.VirtualFrame;

/**
 * Annotation to put on your node to simplify handling of incoming inter-operability {@link Message
 * messages}.
 *
 * This node needs to be an abstract class. Sub-classes will be automatically generated, which is
 * similar to Truffle's DSL for node specialization. The node needs to define accept
 * methods, which implement the node's behaviour. The first argument of accept can be a
 * {@link VirtualFrame} (optional). The second argument of accept needs to be the
 * receiver object, i.e., a {@link TruffleObject}. Afterwards, the arguments of the message follow.
 * For example:
 *
 * {@link com.oracle.truffle.api.dsl.test.interop.Snippets.ExampleTruffleObjectMR}
 *
 * @since 0.13
 */
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.SOURCE)
public @interface Resolve {
    /**
     * Identification of the {@link Message message} to accept. Well known messages include fields
     * of the {@link Message} class (e.g. "READ", "WRITE", "UNBOX",
     * IS_NULL) or slightly mangled names of {@link Message} class factory methods (
     * EXECUTE, INVOKE). For more details on the string encoding of message names
     * see {@link Message#valueOf(java.lang.String)} method.
     *
     * @return string identification of an inter-operability message
     * @see Message#valueOf(java.lang.String)
     */
    String message();
}




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