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/*
* Copyright (c) 2018, 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.
*/
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
/**
* @test
* @bug 8196373
* @summary Introspector should work with overridden generic setter method
*/
public final class OverriddenGenericSetter {
static class Parent<T> {
private T value;
public final T getValue() {return value;}
protected void setValue(T value) {this.value = value;}
}
static class ChildO extends Parent<Object> {
public ChildO() {}
@Override
public void setValue(Object value) {super.setValue(value);}
}
// For overridden setXXX javac will generate the "synthetic bridge" method
// setValue(Ljava/lang/Object). We will use two different types which may be
// placed before/after bridge method.
static class ChildA extends Parent<ArithmeticException> {
public ChildA() {}
@Override
public void setValue(ArithmeticException value) {super.setValue(value);}
}
static class ChildS extends Parent<String> {
public ChildS() {}
@Override
public void setValue(String value) {super.setValue(value);}
}
public static void main(String[] args) throws Exception {
testBehaviour(ChildA.class);
testBehaviour(ChildO.class);
testBehaviour(ChildS.class);
testProperty(ChildA.class, ArithmeticException.class);
testProperty(ChildO.class, Object.class);
testProperty(ChildS.class, String.class);
}
private static void testBehaviour(Class<?> beanClass) throws Exception {
BeanInfo beanInfo = Introspector.getBeanInfo(beanClass, Object.class);
PropertyDescriptor pd = beanInfo.getPropertyDescriptors()[0];
Object bean = beanClass.getConstructor().newInstance();
Method readMethod = pd.getReadMethod();
Method writeMethod = pd.getWriteMethod();
// check roundtrip for default null values
writeMethod.invoke(bean,readMethod.invoke(bean));
writeMethod.invoke(bean,readMethod.invoke(bean));
// set property to non-default value
// check roundtrip for non-default values
Object param = pd.getPropertyType().getConstructor().newInstance();
writeMethod.invoke(bean, param);
writeMethod.invoke(bean, readMethod.invoke(bean));
writeMethod.invoke(bean, readMethod.invoke(bean));
}
private static void testProperty(Class<?> beanClass, Class<?> type) throws Exception {
BeanInfo beanInfo = Introspector.getBeanInfo(beanClass, Object.class);
PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
if (pds.length != 1) {
throw new RuntimeException("Wrong number of properties");
}
PropertyDescriptor pd = pds[0];
System.out.println("pd = " + pd);
String name = pd.getName();
if (!name.equals("value")) {
throw new RuntimeException("Wrong name: " + name);
}
Class<?> propertyType = pd.getPropertyType();
if (propertyType != type) {
throw new RuntimeException("Wrong property type: " + propertyType);
}
Method readMethod = pd.getReadMethod();
if (readMethod == null) {
throw new RuntimeException("Read method is null");
}
Class<?> returnType = readMethod.getReturnType();
if (returnType != Object.class) {
throw new RuntimeException("Wrong return type; " + returnType);
}
Method writeMethod = pd.getWriteMethod();
if (writeMethod == null) {
throw new RuntimeException("Write method is null");
}
Class<?>[] parameterTypes = writeMethod.getParameterTypes();
if (parameterTypes.length != 1) {
throw new RuntimeException("Wrong parameters " + parameterTypes);
}
if (parameterTypes[0] != type) {
throw new RuntimeException("Wrong type: " + parameterTypes[0]);
}
}
}
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