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/*
* spotless:off
* KubaTech - Gregtech Addon
* Copyright (C) 2022 - 2023 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/>.
* spotless:on
*/
package kubatech.api.helpers;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.JarURLConnection;
import java.net.URL;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Objects;
import java.util.jar.JarFile;
import java.util.stream.Collectors;
import net.minecraft.launchwrapper.Launch;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.tree.ClassNode;
public class ReflectionHelper {
private static class _FieldsMethods {
final HashMap<String, Field> fields = new HashMap<>();
final 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;
Field f = null;
do {
exceptionDetected = false;
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> boolean setField(Object obj, String fieldName, T value) {
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 false;
f.set(obj, value);
return true;
}
boolean exceptionDetected;
Field f = null;
do {
exceptionDetected = false;
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 false;
f.set(obj, value);
return true;
} catch (Exception ex) {
return false;
}
}
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;
Method m = null;
do {
exceptionDetected = false;
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;
}
}
/**
* Gets all classes in a specific package path, works only for jar files.
*
* @param packageName The package name
* @return The class nodes
*/
public static Collection<ClassNode> getClasses(String packageName) throws IOException {
ClassLoader classLoader = Thread.currentThread()
.getContextClassLoader();
assert classLoader != null;
String packagePath = packageName.replace('.', '/');
URL resource = classLoader.getResource(packagePath);
if (resource == null) throw new FileNotFoundException();
if (!resource.getProtocol()
.equals("jar")) return Collections.emptySet();
try (JarFile jar = ((JarURLConnection) resource.openConnection()).getJarFile()) {
return jar.stream()
.filter(
j -> !j.isDirectory() && j.getName()
.startsWith(packagePath)
&& j.getName()
.endsWith(".class"))
.map(j -> {
try {
String name = j.getName();
URL jarResource = Launch.classLoader.getResource(name);
if (jarResource == null) return null;
byte[] bytes;
try (InputStream is = jarResource.openStream()) {
bytes = new byte[(int) j.getSize()];
if (is.read(bytes) != bytes.length) return null;
if (is.available() > 0) return null;
}
ClassNode cn = new ClassNode();
ClassReader cr = new ClassReader(bytes);
cr.accept(cn, 0);
return cn;
} catch (IOException ignored) {}
return null;
})
.filter(Objects::nonNull)
.collect(Collectors.toSet());
}
}
}
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