TestCallback.java

/*
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 * 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.
 *
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package com.oracle.truffle.nfi.test.interop;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.interop.ArityException;
import com.oracle.truffle.api.interop.ForeignAccess;
import com.oracle.truffle.api.interop.TruffleObject;

public class TestCallback implements TruffleObject {

    public interface Function {

        @TruffleBoundary
        Object call(Object... args);
    }

    private final int arity;
    private final Function function;

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

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

    @Override
    public ForeignAccess getForeignAccess() {
        return TestCallbackMessageResolutionForeign.ACCESS;
    }
}