TestLayoutAttributes.java

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/*
 * @test
 * @run testng TestLayoutAttributes
 */

import jdk.incubator.foreign.MemoryLayout;
import jdk.incubator.foreign.MemoryLayouts;
import org.testng.annotations.Test;

import java.util.List;
import java.util.stream.Collectors;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertTrue;

public class TestLayoutAttributes {

    @Test
    public void testAttribute() {
        MemoryLayout ml = MemoryLayouts.BITS_32_LE
                .withAttribute("MyAttribute", 10L);
        assertEquals((long) ml.attribute("MyAttribute").orElseThrow(), 10L);
    }

    @Test
    public void testAttributeOverwrite() {
        MemoryLayout ml = MemoryLayouts.BITS_32_LE
                .withAttribute("MyAttribute", 10L);
        assertEquals((long) ml.attribute("MyAttribute").orElseThrow(), 10L);
        ml = ml.withAttribute("MyAttribute", 11L);
        assertEquals((long) ml.attribute("MyAttribute").orElseThrow(), 11L);
    }

    @Test
    public void testAttributeNonExistent() {
        MemoryLayout ml = MemoryLayouts.BITS_32_LE
                .withAttribute("MyAttribute", 10L);
        assertTrue(ml.attribute("Foo").isEmpty());
    }

    @Test
    public void testNameAttribute() {
        MemoryLayout ml = MemoryLayouts.BITS_32_LE
                .withName("foo");
        assertEquals(ml.name().orElseThrow(), "foo");
        assertEquals(ml.attribute(MemoryLayout.LAYOUT_NAME).orElseThrow(), "foo");
    }

    @Test
    public void testAttributesStream() {
        MemoryLayout ml = MemoryLayouts.BITS_32_LE
                .withName("foo")
                .withAttribute("MyAttribute", 10L);
        List<String> attribs = ml.attributes().collect(Collectors.toList());
        assertEquals(attribs.size(), 2);
        assertTrue(attribs.contains("MyAttribute"));
        assertTrue(attribs.contains(MemoryLayout.LAYOUT_NAME));
    }
}