--- /dev/null
+/*
+ * Copyright 2005-2010 the original author or authors.
+ *
+ * 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.wamblee.classloading;
+
+import java.io.File;
+import java.io.IOException;
+
+import java.lang.reflect.Method;
+
+import java.net.URL;
+import java.net.URLClassLoader;
+
+/**
+ * Utility for working with the class loader. Based on the ClassPathHacker
+ * example found on the internet.
+ */
+public class ClassLoaderUtils {
+ // No logging in this class to keep the required class libraries
+ // limited to the standard java classes. This allows use of the
+ // utilities in an environment with a very limited classpath.
+ private static final String JAR_SUFFIX = ".jar";
+
+ /**
+ * Adds all jars in the given directory to the class path.
+ *
+ * @param aDirectory
+ * Directory.
+ * @throws IOException
+ */
+ public static void addJarsInDirectory(File aDirectory) throws IOException {
+ System.out.println("directory '" + aDirectory + "'");
+
+ for (File aFile : aDirectory.listFiles()) {
+ System.out
+ .println("Considering '" + aFile.getCanonicalPath() + "'");
+
+ if (aFile.getName().toLowerCase().endsWith(JAR_SUFFIX)) {
+ System.out.println("Adding '" + aFile.getCanonicalPath() +
+ "' to classpath.");
+ addFile(aFile);
+ }
+ }
+ }
+
+ /**
+ * Adds a file to the classpath.
+ *
+ * @param aFilename
+ * Filename to add.
+ * @throws IOException
+ */
+ public static void addFile(String aFilename) throws IOException {
+ File f = new File(aFilename);
+ addFile(f);
+ }
+
+ /**
+ * Adds a file to the classpath.
+ *
+ * @param aFile
+ * File to add.
+ * @throws IOException
+ */
+ public static void addFile(File aFile) throws IOException {
+ addURL(aFile.toURL());
+ }
+
+ /**
+ * Adds a url to the classpath.
+ *
+ * @param aUrl
+ * Url to add.
+ * @throws IOException
+ */
+ public static void addURL(URL aUrl) throws IOException {
+ URLClassLoader sysloader = (URLClassLoader) ClassLoader
+ .getSystemClassLoader();
+ Class sysclass = URLClassLoader.class;
+
+ try {
+ Method method = sysclass.getDeclaredMethod("addURL",
+ new Class[] { URL.class });
+ method.setAccessible(true);
+ method.invoke(sysloader, new Object[] { aUrl });
+ } catch (Throwable t) {
+ t.printStackTrace();
+ throw new IOException(
+ "Error, could not add URL to system classloader");
+ }
+ }
+}