Return a list of all fields (whatever access status, and on whatever superclass they were defined) that can be found on this class.
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import javax.servlet.http.HttpServletResponse;
/*
* Copyright 2005 Joe Walker
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @author Joe Walker [joe at getahead dot ltd dot uk]
*/
public class Main {
/**
* Return a list of all fields (whatever access status, and on whatever
* superclass they were defined) that can be found on this class.
* <p>This is like a union of {@link Class#getDeclaredFields()} which
* ignores and super-classes, and {@link Class#getFields()} which ignored
* non-public fields
* @param clazz The class to introspect
* @return The complete list of fields
*/
public static Field[] getAllFields(Class<?> clazz)
{
List<Class<?>> classes = getAllSuperclasses(clazz);
classes.add(clazz);
return getAllFields(classes);
}
/**
* As {@link #getAllFields(Class)} but acts on a list of {@link Class}s and
* uses only {@link Class#getDeclaredFields()}.
* @param classes The list of classes to reflect on
* @return The complete list of fields
*/
private static Field[] getAllFields(List<Class<?>> classes)
{
Set<Field> fields = new HashSet<Field>();
for (Class<?> clazz : classes)
{
fields.addAll(Arrays.asList(clazz.getDeclaredFields()));
}
return fields.toArray(new Field[fields.size()]);
}
/**
* Return a List of super-classes for the given class.
* @param clazz the class to look up
* @return the List of super-classes in order going up from this one
*/
public static List<Class<?>> getAllSuperclasses(Class<?> clazz)
{
List<Class<?>> classes = new ArrayList<Class<?>>();
Class<?> superclass = clazz.getSuperclass();
while (superclass != null)
{
classes.add(superclass);
superclass = superclass.getSuperclass();
}
return classes;
}
}
Related examples in the same category
