/**
* Copyright (C) 2009-2010 Wilfred Springer
*
* This file is part of Preon.
*
* Preon is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2, or (at your option) any later version.
*
* Preon 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 for more details.
*
* You should have received a copy of the GNU General Public License along with
* Preon; see the file COPYING. If not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Linking this library statically or dynamically with other modules is making a
* combined work based on this library. Thus, the terms and conditions of the
* GNU General Public License cover the whole combination.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent modules, and
* to copy and distribute the resulting executable under terms of your choice,
* provided that you also meet, for each linked independent module, the terms
* and conditions of the license of that module. An independent module is a
* module which is not derived from or based on this library. If you modify this
* library, you may extend this exception to your version of the library, but
* you are not obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package org.codehaus.preon.util;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import org.codehaus.preon.annotation.BoundEnumOption;
import edu.emory.mathcs.backport.java.util.Collections;
public class EnumUtils {
@SuppressWarnings("unchecked")
public static <T> Map<Long, T> getBoundEnumOptionIndex(Class<T> enumType) {
if (!enumType.isEnum()) {
return Collections.emptyMap();
} else {
Map<Long, T> result = new HashMap<Long, T>();
Field[] fields = enumType.getFields();
for (Field field : fields) {
if (field.isEnumConstant()) {
try {
field.setAccessible(true);
BoundEnumOption annotation = field
.getAnnotation(BoundEnumOption.class);
if (annotation == null) {
result.put(null, (T) field.get(null));
} else {
result.put(annotation.value(), (T) field.get(null));
}
}
catch (IllegalAccessException iae) {
iae.printStackTrace(); // Should never happen.
}
}
}
return result;
}
}
}