JavaInteropNullTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
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 * 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).
 *
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package com.oracle.truffle.api.interop.java.test;

import org.junit.Assert;
import org.junit.Test;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.interop.CanResolve;
import com.oracle.truffle.api.interop.ForeignAccess;
import com.oracle.truffle.api.interop.InteropException;
import com.oracle.truffle.api.interop.Message;
import com.oracle.truffle.api.interop.MessageResolution;
import com.oracle.truffle.api.interop.Resolve;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.java.JavaInterop;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.RootNode;

public class JavaInteropNullTest {

    interface StringCallback {

        void call(String obj);
    }

    class TestRootNode extends RootNode {

        private final TruffleObject receiver;
        @Child Node execute = Message.createExecute(1).createNode();

        TestRootNode(TruffleObject receiver) {
            super(null);
            this.receiver = receiver;
        }

        @Override
        public Object execute(VirtualFrame frame) {
            try {
                return ForeignAccess.sendExecute(execute, receiver, frame.getArguments());
            } catch (InteropException ex) {
                CompilerDirectives.transferToInterpreter();
                throw new RuntimeException(ex);
            }
        }
    }

    static class TestNull implements TruffleObject {

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

    @MessageResolution(receiverType = TestNull.class)
    static class TestNullMessageResolution {

        @Resolve(message = "IS_NULL")
        abstract static class TestNullIsNull extends Node {
            boolean access(TestNull str) {
                return str != null;
            }
        }

        @CanResolve
        abstract static class CanResolveTestNull extends Node {

            boolean test(TruffleObject object) {
                return object instanceof TestNull;
            }
        }
    }

    @Test
    public void testNullArg() {
        TruffleObject callback = JavaInterop.asTruffleFunction(StringCallback.class, (obj) -> {
            Assert.assertNull(obj);
        });

        CallTarget target = Truffle.getRuntime().createCallTarget(new TestRootNode(callback));
        target.call(new TestNull());
    }
}