org.glassfish.tests.utils.ReflectionUtils Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2021 Contributors to the Eclipse Foundation
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.tests.utils;
import java.lang.reflect.Field;
/**
* Utilities to create a configured Habitat and cache them
*
* @author David Matejcek
* @deprecated Using reflection in tests is considered as bad practice. Use it only if you don't
* have another option.
*/
@Deprecated
public class ReflectionUtils {
/**
* Sets the static field of the class to the given value.
*/
public static void setStaticField(final Class clazz, final String fieldName, final Object value) {
try {
final Field field = clazz.getDeclaredField(fieldName);
field.setAccessible(true);
field.set(null, value);
} catch (final Exception e) {
throw new IllegalStateException(
"Failed to set static field " + fieldName + " of " + clazz + " to " + value,
e);
}
}
/**
* @param an expected assignable type of the field value.
* @return a value of the static field of the clazz
*/
public static T getStaticField(final Class clazz, final String fieldName) {
try {
final Field field = clazz.getDeclaredField(fieldName);
field.setAccessible(true);
return (T) field.get(null);
} catch (final Exception e) {
throw new IllegalStateException("Failed to get static field " + fieldName + " of " + clazz, e);
}
}
/**
* Sets the field of the instance to the given value.
*/
public static void setField(final Object instance, final String fieldName, final Object value) {
try {
final Field field = instance.getClass().getDeclaredField(fieldName);
field.setAccessible(true);
field.set(instance, value);
} catch (final Exception e) {
throw new IllegalStateException("Failed to set field " + fieldName + " of " + instance + " to " + value, e);
}
}
/**
* @param an expected assignable type of the field value.
* @param fieldName a field declared in the instance's class
* @return a value of the field of the instance
*/
public static T getField(final Object instance, final String fieldName) {
return getField(instance, fieldName, instance.getClass());
}
/**
* @param an expected assignable type of the field value.
* @param fieldName a field declared in the ancestor of the instance
* @return a value of the field of the instance
*/
public static T getField(final Object instance, final String fieldName, final Class ancestorOfInstance) {
try {
final Field field = ancestorOfInstance.getDeclaredField(fieldName);
field.setAccessible(true);
return (T) field.get(instance);
} catch (final Exception e) {
throw new IllegalStateException("Failed to get a value of field " + fieldName + " of " + instance, e);
}
}
}