back to one jar pls

src/main/java/me/clip/placeholderapi/util/FileUtil.java

@@ -0,0 +1,77 @@
+/*
+ * This file is part of PlaceholderAPI
+ *
+ * PlaceholderAPI
+ * Copyright (c) 2015 - 2026 PlaceholderAPI Team
+ *
+ * PlaceholderAPI 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.
+ *
+ * PlaceholderAPI 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.clip.placeholderapi.util;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.jar.JarEntry;
+import java.util.jar.JarInputStream;
+
+public class FileUtil {
+
+    @Nullable
+    public static <T> Class<? extends T> findClass(@NotNull final File file,
+                                                   @NotNull final Class<T> clazz) throws IOException, ClassNotFoundException {
+        if (!file.exists()) {
+            return null;
+        }
+
+        final URL jar = file.toURI().toURL();
+        final URLClassLoader loader = new URLClassLoader(new URL[]{jar}, clazz.getClassLoader());
+        final List<String> matches = new ArrayList<>();
+        final List<Class<? extends T>> classes = new ArrayList<>();
+
+        try (final JarInputStream stream = new JarInputStream(jar.openStream())) {
+            JarEntry entry;
+            while ((entry = stream.getNextJarEntry()) != null) {
+                final String name = entry.getName();
+                if (name.isEmpty() || !name.endsWith(".class")) {
+                    continue;
+                }
+
+                matches.add(name.substring(0, name.lastIndexOf('.')).replace('/', '.'));
+            }
+
+            for (final String match : matches) {
+                try {
+                    final Class<?> loaded = loader.loadClass(match);
+                    if (clazz.isAssignableFrom(loaded)) {
+                        classes.add(loaded.asSubclass(clazz));
+                    }
+                } catch (final NoClassDefFoundError ignored) {
+                }
+            }
+        }
+        if (classes.isEmpty()) {
+            loader.close();
+            return null;
+        }
+        return classes.get(0);
+    }
+
+}