ClassInteropTest.java

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

import com.oracle.truffle.api.interop.InteropException;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import org.junit.Before;
import org.junit.Test;

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

public class ClassInteropTest {
    private TruffleObject obj;
    private XYPlus xyp;

    public static int x;
    public static double y;
    public static final int CONST = 42;
    public int value = CONST;

    public static double plus(double a, double b) {
        return a + b;
    }

    @Before
    public void initObjects() {
        obj = JavaInterop.asTruffleObject(ClassInteropTest.class);
        xyp = JavaInterop.asJavaObject(XYPlus.class, obj);
    }

    @Test
    public void doubleWrap() {
        x = 32;
        y = 10.1;
        assertEquals("Assume delegated", 42.1d, xyp.plus(xyp.x(), xyp.y()), 0.05);
    }

    @Test
    public void readCONST() {
        assertEquals("Field read", 42, xyp.CONST(), 0.01);
    }

    @Test(expected = UnknownIdentifierException.class)
    public void cannotReadValueAsItIsNotStatic() throws Exception {
        assertEquals("Field read", 42, xyp.value());
        fail("value isn't static field");
    }

    @Test
    public void canReadValueAfterCreatingNewInstance() throws Exception {
        Object objInst = JavaInteropTest.message(Message.createNew(0), obj);
        assertTrue("It is truffle object", objInst instanceof TruffleObject);
        XYPlus inst = JavaInterop.asJavaObject(XYPlus.class, (TruffleObject) objInst);
        assertEquals("Field read", 42, inst.value());
    }

    @Test(expected = UnknownIdentifierException.class)
    public void noNonStaticMethods() {
        Object res = JavaInteropTest.message(Message.READ, obj, "readCONST");
        assertNull("not found", res);
    }

    public interface XYPlus {
        int x();

        double y();

        double plus(double a, double b);

        // Checkstyle: stop method name check
        int CONST();

        // Checkstyle: resume method name check

        int value() throws InteropException;
    }
}