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/*
* Copyright (c) 2023, 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 8071693
* @summary Verify that the Introspector finds default methods inherited
* from interfaces
*/
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashSet;
import java.util.NavigableSet;
import java.util.Set;
import java.util.stream.Collectors;
public class DefaultMethodBeanPropertyTest {
//////////////////////////////////////
// //
// SCENARIO 1 //
// //
//////////////////////////////////////
public interface A1 {
default int getValue() {
return 0;
}
default Object getObj() {
return null;
}
public static int getStaticValue() {
return 0;
}
}
public interface B1 extends A1 {
}
public interface C1 extends A1 {
Number getFoo();
}
public class D1 implements C1 {
@Override
public Integer getFoo() {
return null;
}
@Override
public Float getObj() {
return null;
}
}
public static void testScenario1() {
verifyProperties(D1.class,
"getClass", // inherited method
"getValue", // inherited default method
"getFoo", // overridden interface method
"getObj" // overridden default method
);
}
//////////////////////////////////////
// //
// SCENARIO 2 //
// //
//////////////////////////////////////
public interface A2 {
default Object getFoo() {
return null;
}
}
public interface B2 extends A2 {
}
public interface C2 extends A2 {
}
public class D2 implements B2, C2 {
}
public static void testScenario2() {
verifyProperties(D2.class,
"getClass",
"getFoo"
);
}
//////////////////////////////////////
// //
// SCENARIO 3 //
// //
//////////////////////////////////////
public interface A3 {
default Object getFoo() {
return null;
}
}
public interface B3 extends A3 {
@Override
Set<?> getFoo();
}
public interface C3 extends A3 {
@Override
Collection<?> getFoo();
}
public class D3 implements B3, C3 {
@Override
public NavigableSet<?> getFoo() {
return null;
}
}
public static void testScenario3() {
verifyProperties(D3.class,
"getClass",
"getFoo"
);
}
// Helper methods
public static void verifyProperties(Class<?> type, String... getterNames) {
// Gather expected properties
final HashSet<PropertyDescriptor> expected = new HashSet<>();
for (String methodName : getterNames) {
final String suffix = methodName.substring(3);
final String propName = Introspector.decapitalize(suffix);
final Method getter;
try {
getter = type.getMethod(methodName);
} catch (NoSuchMethodException e) {
throw new Error("unexpected error", e);
}
final PropertyDescriptor propDesc;
try {
propDesc = new PropertyDescriptor(propName, getter, null);
} catch (IntrospectionException e) {
throw new Error("unexpected error", e);
}
expected.add(propDesc);
}
// Verify properties can be found directly
expected.stream()
.map(PropertyDescriptor::getName)
.filter(name -> BeanUtils.getPropertyDescriptor(type, name) == null)
.findFirst()
.ifPresent(name -> {
throw new Error("property \"" + name + "\" not found in " + type);
});
// Gather actual properties
final Set<PropertyDescriptor> actual =
Set.of(BeanUtils.getPropertyDescriptors(type));
// Verify the two sets are the same
if (!actual.equals(expected)) {
throw new Error("mismatch: " + type
+ "\nACTUAL:\n "
+ actual.stream()
.map(Object::toString)
.collect(Collectors.joining("\n "))
+ "\nEXPECTED:\n "
+ expected.stream()
.map(Object::toString)
.collect(Collectors.joining("\n ")));
}
}
// Main method
public static void main(String[] args) throws Exception {
testScenario1();
testScenario2();
testScenario3();
}
}
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