AssignableFromTest.java

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/*
 * @test
 * @bug 8246774
 * @summary Test for subtype stream field value assign-ability
 * @library /test/lib
 * @modules jdk.compiler
 * @compile AssignableFrom.java Point.java
 *          DefaultValues.java SuperStreamFields.java
 * @run testng AssignableFromTest
 */

import java.math.BigDecimal;
import java.math.BigInteger;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static java.lang.System.out;
import static org.testng.Assert.assertEquals;

/**
 * Basic test to check that stream field values that are not the exact
 * declared param/field type, but assignable to a declared supertype,
 * are bound/assigned correctly.
 */
public class AssignableFromTest extends AbstractTest {

    @DataProvider(name = "plainInstances")
    public Object[][] plainInstances() {
        return new Object[][] {
            new Object[] { newPlainAssignableFrom(Byte.valueOf((byte)11))   },
            new Object[] { newPlainAssignableFrom(Short.valueOf((short)22)) },
            new Object[] { newPlainAssignableFrom(Integer.valueOf(33))      },
            new Object[] { newPlainAssignableFrom(Long.valueOf(44))         },
            new Object[] { newPlainAssignableFrom(BigDecimal.valueOf(55))   },
            new Object[] { newPlainAssignableFrom(BigInteger.valueOf(66))   },
        };
    }

    /** Serialize non-record (plain) instances, deserialize as a record. */
    @Test(dataProvider = "plainInstances")
    public void testPlainToRecord(AssignableFrom objToSerialize) throws Exception {
        assert !objToSerialize.getClass().isRecord();
        out.println("serialize   : " + objToSerialize);
        byte[] bytes = serialize(objToSerialize);
        AssignableFrom objDeserialized = deserializeAsRecord(bytes);
        assert objDeserialized.getClass().isRecord();
        out.println("deserialized: " + objDeserialized);

        assertEquals(objToSerialize.number(), objDeserialized.number());
        assertEquals(objDeserialized.number(), objToSerialize.number());
        assertEquals(objDeserialized.number().getClass(), objDeserialized.number().getClass());

    }

    @DataProvider(name = "recordInstances")
    public Object[][] recordInstances() {
        return new Object[][] {
            new Object[] { newRecordAssignableFrom(Byte.valueOf((byte)21))   },
            new Object[] { newRecordAssignableFrom(Short.valueOf((short)32)) },
            new Object[] { newRecordAssignableFrom(Integer.valueOf(43))      },
            new Object[] { newRecordAssignableFrom(Long.valueOf(54))         },
            new Object[] { newRecordAssignableFrom(BigDecimal.valueOf(65))   },
            new Object[] { newRecordAssignableFrom(BigInteger.valueOf(76))   },
        };
    }

    /** Serialize record instances, deserialize as non-record (plain). */
    @Test(dataProvider = "recordInstances")
    public void testRecordToPlain(AssignableFrom objToSerialize) throws Exception {
        assert objToSerialize.getClass().isRecord();
        out.println("serialize   : " + objToSerialize);
        byte[] bytes = serialize(objToSerialize);
        AssignableFrom objDeserialized = deserializeAsPlain(bytes);
        assert !objDeserialized.getClass().isRecord();
        out.println("deserialized: " + objDeserialized);

        assertEquals(objToSerialize.number(), objDeserialized.number());
        assertEquals(objDeserialized.number(), objToSerialize.number());
        assertEquals(objDeserialized.number().getClass(), objDeserialized.number().getClass());
    }

    static AssignableFrom newPlainAssignableFrom(Number number) {
        try {
            Class<?> c = Class.forName("AssignableFromImpl", true, plainLoader);
            var obj = (AssignableFrom) c.getConstructor(Number.class).newInstance(number);
            assert !obj.getClass().isRecord();
            return obj;
        } catch (ReflectiveOperationException e) {
            throw new AssertionError(e);
        }
    }

    static AssignableFrom newRecordAssignableFrom(Number number) {
        try {
            Class<?> c = Class.forName("AssignableFromImpl", true, recordLoader);
            var obj = (AssignableFrom) c.getConstructor(Number.class).newInstance(number);
            assert obj.getClass().isRecord();
            return obj;
        } catch (ReflectiveOperationException e) {
            throw new AssertionError(e);
        }
    }
}