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products/sources/formale Sprachen/Java/Openjdk/test/jdk/java/lang/reflect/records/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 8 kB

Quelle IsRecordTest.java Sprache: JAVA

/*
* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

/*
* @test
* @bug 8255560
* @summary Class::isRecord should check that the current class is final and not abstract
* @modules java.base/jdk.internal.org.objectweb.asm
* @library /test/lib
* @run testng/othervm IsRecordTest
* @run testng/othervm/java.security.policy=allPermissions.policy IsRecordTest
*/

import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.List;
import java.util.Map;
import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.Opcodes;
import jdk.test.lib.ByteCodeLoader;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static java.lang.System.out;
import static jdk.internal.org.objectweb.asm.ClassWriter.*;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertTrue;

public class IsRecordTest {

    @DataProvider(name = "scenarios")
    public Object[][] scenarios() {
        return new Object[][] {
             // isFinal, isAbstract, extendJLR, withRecAttr, expectIsRecord
             {     false,    false,     false,    true,      false    },
             {     false,    false,     true,     true,      false    },
             {     false,    true,      false,    true,      false    },
             {     false,    true,      true,     true,      false    },
             {     true,     false,     false,    true,      false    },
             {     true,     false,     true,     true,      true     },

             {     false,    false,     false,    false,     false    },
             {     false,    false,     true,     false,     false    },
             {     false,    true,      false,    false,     false    },
             {     false,    true,      true,     false,     false    },
             {     true,     false,     false,    false,     false    },
             {     true,     false,     true,     false,     false    },
        };
    }

    /**
     * Tests the valid combinations of i) final/non-final, ii) abstract/non-abstract,
     * iii) direct subclass of j.l.Record (or not), along with the presence or
     * absence of a record attribute.
     */
    @Test(dataProvider = "scenarios")
    public void testDirectSubClass(boolean isFinal,
                                   boolean isAbstract,
                                   boolean extendsJLR,
                                   boolean withRecordAttr,
                                   boolean expectIsRecord) throws Exception {
        out.println("\n--- testDirectSubClass isFinal=%s, isAbstract=%s, extendsJLR=%s, withRecordAttr=%s, expectIsRecord=%s ---"
                .formatted(isFinal, isAbstract, extendsJLR, withRecordAttr, expectIsRecord));

        List<RecordComponentEntry> rc = null;
        if (withRecordAttr)
            rc = List.of(new RecordComponentEntry("x", "I"));
        String superName = extendsJLR ? "java/lang/Record" : "java/lang/Object";
        var classBytes = generateClassBytes("C", isFinal, isAbstract, superName, rc);
        Class<?> cls = ByteCodeLoader.load("C", classBytes);
        out.println("cls=%s, Record::isAssignable=%s, isRecord=%s"
                .formatted(cls, Record.class.isAssignableFrom(cls), cls.isRecord()));
        assertEquals(cls.isRecord(), expectIsRecord);
        var getRecordComponents = cls.getRecordComponents();
        assertTrue(expectIsRecord ? getRecordComponents != null : getRecordComponents == null);
    }

    /**
     * Tests the valid combinations of i) final/non-final, ii) abstract/non-abstract,
     * along with the presence or absence of a record attribute, where the class has
     * a superclass whose superclass is j.l.Record.
     */
    @Test(dataProvider = "scenarios")
    public void testIndirectSubClass(boolean isFinal,
                                     boolean isAbstract,
                                     boolean unused1,
                                     boolean withRecordAttr,
                                     boolean unused2) throws Exception {
        out.println("\n--- testIndirectSubClass isFinal=%s, isAbstract=%s withRecordAttr=%s ---"
                .formatted(isFinal, isAbstract, withRecordAttr));

        List<RecordComponentEntry> rc = null;
        if (withRecordAttr)
            rc = List.of(new RecordComponentEntry("x", "I"));
        var supFooClassBytes = generateClassBytes("SupFoo", false, isAbstract, "java/lang/Record", rc);
        var subFooClassBytes = generateClassBytes("SubFoo", isFinal, isAbstract, "SupFoo", rc);
        var allClassBytes = Map.of("SupFoo", supFooClassBytes,
                                   "SubFoo", subFooClassBytes);

        ClassLoader loader = new ByteCodeLoader(allClassBytes, null);
        Class<?> supFooCls = loader.loadClass("SupFoo");
        Class<?> subFooCls = loader.loadClass("SubFoo");
        for (var cls : List.of(supFooCls, subFooCls))
            out.println("cls=%s, Record::isAssignable=%s, isRecord=%s"
                    .formatted(cls, Record.class.isAssignableFrom(cls), cls.isRecord()));
        assertFalse(supFooCls.isRecord());
        assertFalse(subFooCls.isRecord());
        assertEquals(supFooCls.getRecordComponents(), null);
        assertEquals(subFooCls.getRecordComponents(), null);
    }

    /** Tests record-ness properties of traditionally compiled classes. */
    @Test
    public void testBasicRecords() {
        out.println("\n--- testBasicRecords ---");
        record EmptyRecord () { }
        assertTrue(EmptyRecord.class.isRecord());
        assertEquals(EmptyRecord.class.getRecordComponents().length, 0);

        record FooRecord (int x) { }
        assertTrue(FooRecord.class.isRecord());
        assertTrue(FooRecord.class.getRecordComponents() != null);

        final record FinalFooRecord (int x) { }
        assertTrue(FinalFooRecord.class.isRecord());
        assertTrue(FinalFooRecord.class.getRecordComponents() != null);

        class A { }
        assertFalse(A.class.isRecord());
        assertFalse(A.class.getRecordComponents() != null);

        final class B { }
        assertFalse(B.class.isRecord());
        assertFalse(B.class.getRecordComponents() != null);
    }

    // --  infra

    // Generates a class with the given properties.
    byte[] generateClassBytes(String className,
                              boolean isFinal,
                              boolean isAbstract,
                              String superName,
                              List<RecordComponentEntry> components) {
        ClassWriter cw = new ClassWriter(COMPUTE_MAXS | COMPUTE_FRAMES);

        int access = 0;
        if (isFinal)
            access = access | Opcodes.ACC_FINAL;
        if (isAbstract)
            access = access | Opcodes.ACC_ABSTRACT;

        cw.visit(Opcodes.V16,
                 access,
                 className,
                 null,
                 superName,
                 null);

        if (components != null)
            components.forEach(rc -> cw.visitRecordComponent(rc.name(), rc.descriptor(), null));

        cw.visitEnd();
        return cw.toByteArray();
    }

    record RecordComponentEntry (String name, String descriptor) { }

}

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