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-rw-r--r--src/main/java/org/traccar/helper/ClassScanner.java80
1 files changed, 80 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/helper/ClassScanner.java b/src/main/java/org/traccar/helper/ClassScanner.java
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+++ b/src/main/java/org/traccar/helper/ClassScanner.java
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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;
+ }
+
+}