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/*
* KubaTech - Gregtech Addon
* Copyright (C) 2022 kuba6000
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <https://www.gnu.org/licenses/>.
*
*/
package kubatech.api.utils;
import java.lang.reflect.Field;
import java.util.HashMap;
public class ReflectionHelper {
private static final HashMap<String, HashMap<String, Field>> fields = new HashMap<>();
public static <T> T getField(Object obj, String fieldName, boolean useBasicTypes, T defaultvalue) {
Class<?> cl = obj.getClass();
String clName = cl.getName();
HashMap<String, Field> classmap = fields.computeIfAbsent(clName, s -> new HashMap<>());
try {
if (classmap.containsKey(fieldName)) {
return (T) classmap.get(fieldName).get(obj);
}
boolean exceptionDetected = false;
Field f = null;
do {
try {
f = cl.getDeclaredField(fieldName);
f.setAccessible(true);
} catch (Exception ex) {
exceptionDetected = true;
cl = cl.getSuperclass();
}
} while (exceptionDetected && !cl.equals(Object.class));
if (f == null) return defaultvalue;
classmap.put(fieldName, f);
return (T) f.get(obj);
} catch (Exception ex) {
return defaultvalue;
}
}
public static <T> T getField(Object obj, String fieldName, boolean useBasicTypes) {
return getField(obj, fieldName, useBasicTypes, null);
}
public static <T> T getField(Object obj, String fieldName) {
return getField(obj, fieldName, true, null);
}
}
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