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 * permitted provided that the following conditions are met:
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 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided
 * with the distribution.
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 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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package com.oracle.truffle.llvm.tests.interop.values;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.interop.ArityException;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.library.ExportLibrary;
import com.oracle.truffle.api.library.ExportMessage;

@ExportLibrary(InteropLibrary.class)
public class TestCallback implements TruffleObject {

    public interface Function {

        Object call(Object... args);
    }

    private final int arity;
    private final Function function;

    public TestCallback(int arity, Function function) {
        this.arity = arity;
        this.function = function;
    }

    @TruffleBoundary
    Object call(Object... args) throws ArityException {
        if (args.length == arity) {
            Object ret = function.call(args);
            return ret;
        } else {
            throw ArityException.create(arity, args.length);
        }
    }

    @ExportMessage
    boolean isExecutable() {
        return true;
    }

    @ExportMessage
    Object execute(Object[] arguments) throws ArityException {
        Object res = call(arguments);
        return res == null ? new NullValue() : res;
    }
}