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/*
* Copyright 2022 Anton Tananaev (anton@traccar.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.helper;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;
import java.util.Enumeration;
import java.util.LinkedList;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
public final class ClassScanner {
private ClassScanner() {
}
public static List<Class<?>> findSubclasses(
Class<?> baseClass) throws IOException, URISyntaxException, ReflectiveOperationException {
return findSubclasses(baseClass, baseClass.getPackageName());
}
public static List<Class<?>> findSubclasses(Class<?> baseClass, String packageName)
throws IOException, URISyntaxException, ReflectiveOperationException {
List<String> names = new LinkedList<>();
String packagePath = packageName.replace('.', '/');
URL packageUrl = baseClass.getClassLoader().getResource(packagePath);
if (packageUrl.getProtocol().equals("jar")) {
String jarFileName = URLDecoder.decode(packageUrl.getFile(), StandardCharsets.UTF_8.name());
try (JarFile jf = new JarFile(jarFileName.substring(5, jarFileName.indexOf("!")))) {
Enumeration<JarEntry> jarEntries = jf.entries();
while (jarEntries.hasMoreElements()) {
String entryName = jarEntries.nextElement().getName();
if (entryName.startsWith(packagePath) && entryName.length() > packagePath.length() + 5) {
names.add(entryName.substring(packagePath.length() + 1, entryName.lastIndexOf('.')));
}
}
}
} else {
File folder = new File(new URI(packageUrl.toString()));
File[] files = folder.listFiles();
if (files != null) {
for (File actual: files) {
String entryName = actual.getName();
names.add(entryName.substring(0, entryName.lastIndexOf('.')));
}
}
}
var classes = new LinkedList<Class<?>>();
for (String name : names) {
var clazz = Class.forName(packageName + '.' + name);
if (baseClass.isAssignableFrom(clazz)) {
classes.add(clazz);
}
}
return classes;
}
}
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