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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.helpers;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
public class ReflectionHelper {
private static class _FieldsMethods {
HashMap<String, Field> fields = new HashMap<>();
HashMap<String, Method> methods = new HashMap<>();
}
private static final HashMap<String, _FieldsMethods> classes = new HashMap<>();
@SuppressWarnings("unchecked")
public static <T> T getField(Object obj, String fieldName, T defaultvalue) {
Class<?> cl = obj.getClass();
String clName = cl.getName();
HashMap<String, Field> classmap = classes.computeIfAbsent(clName, s -> new _FieldsMethods()).fields;
try {
if (classmap.containsKey(fieldName)) {
Field f = classmap.get(fieldName);
if (f == null) return defaultvalue;
return (T) f.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));
classmap.put(fieldName, f);
if (f == null) return defaultvalue;
return (T) f.get(obj);
} catch (Exception ex) {
return defaultvalue;
}
}
public static <T> T getField(Object obj, String fieldName) {
return getField(obj, fieldName, null);
}
@SuppressWarnings("unchecked")
public static <T> T callMethod(Object obj, String methodName, T defaultValue, Object... args) {
Class<?> cl = obj.getClass();
String clName = cl.getName();
HashMap<String, Method> classmap = classes.computeIfAbsent(clName, s -> new _FieldsMethods()).methods;
StringBuilder builder = new StringBuilder(methodName);
Class<?>[] argsTypes = new Class<?>[args.length];
for (int i = 0; i < args.length; i++) {
Class<?> arg = args[i].getClass();
builder.append(";").append(arg.getSimpleName());
argsTypes[i] = arg;
}
String methodNameUnique = builder.toString();
try {
if (classmap.containsKey(methodNameUnique)) {
Method m = classmap.get(methodNameUnique);
if (m == null) return defaultValue;
return (T) m.invoke(obj, args);
}
boolean exceptionDetected = false;
Method m = null;
do {
try {
m = cl.getDeclaredMethod(methodName, argsTypes);
m.setAccessible(true);
} catch (Exception ex) {
exceptionDetected = true;
cl = cl.getSuperclass();
}
} while (exceptionDetected && !cl.equals(Object.class));
classmap.put(methodNameUnique, m);
if (m == null) return defaultValue;
return (T) m.invoke(obj, args);
} catch (Exception ex) {
return defaultValue;
}
}
}
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