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/*
* This file is part of spark.
*
* Copyright (c) lucko (Luck) <luck@lucko.me>
* Copyright (c) contributors
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package me.lucko.spark.common.util;
import net.bytebuddy.agent.ByteBuddyAgent;
import org.checkerframework.checker.nullness.qual.Nullable;
import java.lang.instrument.Instrumentation;
import java.util.HashMap;
import java.util.Map;
/**
* Uses {@link Instrumentation} to find a class reference for given class names.
*
* <p>This is necessary as we don't always have access to the classloader for a given class.</p>
*/
public class ClassFinder {
private final Map<String, Class<?>> classes = new HashMap<>();
public ClassFinder() {
Instrumentation instrumentation;
try {
instrumentation = ByteBuddyAgent.install();
} catch (Exception e) {
return;
}
if (instrumentation == null) {
return;
}
// obtain and cache loaded classes
for (Class<?> loadedClass : instrumentation.getAllLoadedClasses()) {
this.classes.put(loadedClass.getName(), loadedClass);
}
}
public @Nullable Class<?> findClass(String className) {
// try instrumentation
Class<?> clazz = this.classes.get(className);
if (clazz != null) {
return clazz;
}
// try Class.forName
try {
return Class.forName(className);
} catch (Throwable e) {
// ignore
}
return null;
}
}
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