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/*
* Copyright (c) 2020, 2021, 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 8225056
* @compile GetPermittedSubclasses.jcod
* @compile noSubclass/BaseC.java noSubclass/BaseI.java noSubclass/Impl1.java
* @compile noSubclass/Impl2.java
* @run main GetPermittedSubclassesTest
*/
import java.util.ArrayList;
// Test Class GetPermittedSubtpes() and Class.isSealed() APIs.
public class GetPermittedSubclassesTest {
sealed class Sealed1 permits Sub1 {}
final class Sub1 extends Sealed1 implements SealedI1 {}
sealed interface SealedI1 permits NotSealed, Sub1, Extender {}
non-sealed interface Extender extends SealedI1 { }
final class FinalC implements Extender {}
final class NotSealed implements SealedI1 {}
final class Final4 {}
public static void testSealedInfo(Class<?> c, String[] expected, boolean isSealed) {
var permitted = c.getPermittedSubclasses();
if (isSealed) {
if (permitted.length != expected.length) {
throw new RuntimeException(
"Unexpected number of permitted subclasses for: " + c.toString() +
"(" + java.util.Arrays.asList(permitted));
}
if (!c.isSealed()) {
throw new RuntimeException("Expected sealed class: " + c.toString());
}
// Create ArrayList of permitted subclasses class names.
ArrayList<String> permittedNames = new ArrayList<String>();
for (int i = 0; i < permitted.length; i++) {
permittedNames.add(permitted[i].getName());
}
if (permittedNames.size() != expected.length) {
throw new RuntimeException(
"Unexpected number of permitted names for: " + c.toString());
}
// Check that expected class names are in the permitted subclasses list.
for (int i = 0; i < expected.length; i++) {
if (!permittedNames.contains(expected[i])) {
throw new RuntimeException(
"Expected class not found in permitted subclases list, super class: " +
c.getName() + ", expected class: " + expected[i]);
}
}
} else {
// Must not be sealed.
if (c.isSealed() || permitted != null) {
throw new RuntimeException("Unexpected sealed class: " + c.toString());
}
}
}
public static void testBadSealedClass(String className,
Class<?> expectedException,
String expectedCFEMessage) throws Throwable {
try {
Class.forName(className);
throw new RuntimeException("Expected ClassFormatError exception not thrown for " + className);
} catch (ClassFormatError cfe) {
if (ClassFormatError.class != expectedException) {
throw new RuntimeException(
"Class " + className + " got unexpected exception: " + cfe.getMessage());
}
if (!cfe.getMessage().contains(expectedCFEMessage)) {
throw new RuntimeException(
"Class " + className + " got unexpected ClassFormatError exception: " + cfe.getMessage());
}
} catch (IncompatibleClassChangeError icce) {
if (IncompatibleClassChangeError.class != expectedException) {
throw new RuntimeException(
"Class " + className + " got unexpected exception: " + icce.getMessage());
}
if (!icce.getMessage().contains(expectedCFEMessage)) {
throw new RuntimeException(
"Class " + className + " got unexpected IncompatibleClassChangeError exception: " + icce.getMessage());
}
}
}
public static void main(String... args) throws Throwable {
testSealedInfo(SealedI1.class, new String[] {"GetPermittedSubclassesTest$NotSealed",
"GetPermittedSubclassesTest$Sub1",
"GetPermittedSubclassesTest$Extender"},
true);
testSealedInfo(Sealed1.class, new String[] {"GetPermittedSubclassesTest$Sub1"}, true);
testSealedInfo(Final4.class, null, false);
testSealedInfo(NotSealed.class, null, false);
// Test class with PermittedSubclasses attribute but old class file version.
testSealedInfo(OldClassFile.class, null, false);
// Test class with an empty PermittedSubclasses attribute.
testSealedInfo(NoSubclasses.class, new String[]{}, true);
// Test that a class with an empty PermittedSubclasses attribute cannot be subclass-ed.
testBadSealedClass("SubClass", IncompatibleClassChangeError.class,
"SubClass cannot inherit from sealed class NoSubclasses");
// Test returning only names of existing classes.
testSealedInfo(NoLoadSubclasses.class, new String[]{"ExistingClassFile" }, true);
// Test that loading a class with a corrupted PermittedSubclasses attribute
// causes a ClassFormatError.
testBadSealedClass("BadPermittedAttr", ClassFormatError.class,
"Permitted subclass class_info_index 15 has bad constant type");
// Test that loading a sealed final class with a PermittedSubclasses
// attribute causes a ClassFormatError.
testBadSealedClass("SealedButFinal", ClassFormatError.class,
"PermittedSubclasses attribute in final class");
// Test that loading a sealed class with an ill-formed class name in its
// PermittedSubclasses attribute causes a ClassFormatError.
testBadSealedClass("BadPermittedSubclassEntry", ClassFormatError.class,
"Illegal class name \"iDont;;Exist\" in class file");
// Test that loading a sealed class with an empty class name in its PermittedSubclasses
// attribute causes a ClassFormatError.
testBadSealedClass("EmptyPermittedSubclassEntry", ClassFormatError.class,
"Illegal class name \"\" in class file");
//test type enumerated in the PermittedSubclasses attribute,
//which are not direct subtypes of the current class are not returned:
testSealedInfo(noSubclass.BaseC.class, new String[] {"noSubclass.ImplCIntermediate"}, true);
testSealedInfo(noSubclass.BaseI.class, new String[] {"noSubclass.ImplIIntermediateI", "noSubclass.ImplIIntermediateC"}, true);
}
}
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