| /* |
| * Copyright 2014-present Facebook, Inc. |
| * |
| * 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 com.facebook.buck.cli.bootstrapper; |
| |
| import java.io.File; |
| import java.lang.reflect.Method; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.nio.file.Paths; |
| import java.util.Arrays; |
| |
| public final class ClassLoaderBootstrapper { |
| private static ClassLoader classLoader; |
| |
| private ClassLoaderBootstrapper() { |
| } |
| |
| public static void main(String[] args) throws Exception { |
| String classPath = System.getenv("BUCK_CLASSPATH"); |
| if (classPath == null) { |
| throw new RuntimeException("BUCK_CLASSPATH not set"); |
| } |
| |
| String mainClassName = args[0]; |
| String[] remainingArgs = Arrays.copyOfRange(args, 1, args.length); |
| classLoader = createClassLoader(classPath); |
| |
| // Some things (notably Jetty) use the context class loader to load stuff |
| Thread.currentThread().setContextClassLoader(classLoader); |
| |
| Class<?> mainClass = classLoader.loadClass(mainClassName); |
| Method mainMethod = mainClass.getMethod("main", String[].class); |
| mainMethod.invoke(null, (Object) remainingArgs); |
| } |
| |
| public static Class<?> loadClass(String name) { |
| try { |
| return classLoader.loadClass(name); |
| } catch (ClassNotFoundException e) { |
| throw new NoClassDefFoundError(name); |
| } |
| } |
| |
| private static ClassLoader createClassLoader(String classPath) |
| throws MalformedURLException { |
| String[] strings = classPath.split(File.pathSeparator); |
| URL[] urls = new URL[strings.length]; |
| for (int i = 0; i < urls.length; i++) { |
| urls[i] = Paths.get(strings[i]).toUri().toURL(); |
| } |
| |
| return new URLClassLoader(urls); |
| } |
| } |