/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project 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 or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.nutsnbolts.reflection;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.LinkedList;
import java.util.concurrent.ConcurrentHashMap;
import org.smallmind.nutsnbolts.util.AlphaNumericComparator;
public class FieldUtility {
private static final AlphaNumericComparator<Field> ALPHA_NUMERIC_COMPARATOR = new AlphaNumericComparator<>(Field::getName);
private static final ConcurrentHashMap<Class<?>, Field[]> FIELD_MAP = new ConcurrentHashMap<>();
public static Field getField (Class<?> clazz, String name) {
for (Field field : getFields(clazz)) {
if (field.getName().equals(name)) {
return field;
}
}
return null;
}
public static Field[] getFields (final Class<?> clazz) {
Field[] fields;
if ((fields = FIELD_MAP.get(clazz)) == null) {
synchronized (FIELD_MAP) {
if ((fields = FIELD_MAP.get(clazz)) == null) {
Class<?> currentClass = clazz;
LinkedList<Field> fieldList = new LinkedList<>();
do {
for (Field field : currentClass.getDeclaredFields()) {
if (!(field.isSynthetic() || Modifier.isStatic(field.getModifiers()) || Modifier.isTransient(field.getModifiers()))) {
field.setAccessible(true);
fieldList.add(field);
}
}
} while ((currentClass = currentClass.getSuperclass()) != null);
fieldList.sort(ALPHA_NUMERIC_COMPARATOR);
fields = new Field[fieldList.size()];
fieldList.toArray(fields);
FIELD_MAP.put(clazz, fields);
}
}
}
return fields;
}
}