MethodMessageTest.java

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package com.oracle.truffle.api.interop.java.test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import org.junit.Test;

import com.oracle.truffle.api.interop.Message;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.java.JavaInterop;
import com.oracle.truffle.api.interop.java.MethodMessage;

public class MethodMessageTest {
    interface MathWrap {
        @MethodMessage(message = "READ")
        MaxFunction max();
    }

    interface MaxFunction {
        @MethodMessage(message = "IS_NULL")
        boolean isNull();

        @MethodMessage(message = "HAS_SIZE")
        boolean isArray();

        @MethodMessage(message = "GET_SIZE")
        int size();

        @MethodMessage(message = "IS_EXECUTABLE")
        boolean canExecute();

        @MethodMessage(message = "EXECUTE")
        Number compute(int a, int b);
    }

    @Test
    public void functionTest() throws Exception {
        TruffleObject truffleMath = JavaInterop.asTruffleObject(Math.class);
        MathWrap wrap = JavaInterop.asJavaObject(MathWrap.class, truffleMath);
        MaxFunction functionArityTwo = wrap.max();
        assertTrue("function can be executed", functionArityTwo.canExecute());
        assertFalse("function isn't null", functionArityTwo.isNull());
        assertFalse("function isn't array", functionArityTwo.isArray());
        int res = functionArityTwo.compute(10, 5).intValue();
        assertEquals(10, res);
    }

    @Test
    public void workWithAnArray() throws Exception {
        TruffleObject arr = JavaInterop.asTruffleObject(new Object[]{1, 2, 3});

        Boolean itIsAnArray = (Boolean) JavaInteropTest.message(Message.HAS_SIZE, arr);
        assertTrue("Yes, array", itIsAnArray);

        MaxFunction wrap = JavaInterop.asJavaObject(MaxFunction.class, arr);

        assertTrue("It is an array", wrap.isArray());
        assertFalse("No function", wrap.canExecute());
        assertFalse("Not null", wrap.isNull());

        assertEquals("Size is 3", 3, wrap.size());
    }
}