ClassPathHacker.java

/*
Copyright 2011-2016 Google Inc. All Rights Reserved.

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.google.security.zynamics.zylib.plugins;

import java.io.File;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;

public class ClassPathHacker {
  private static final Class<?>[] parameters = new Class[] {URL.class};

  /* File.toURL() was deprecated, so use File.toURI().toURL() */
  public static void addFile(final File f) {
    try {
      addURL(f.toURI().toURL());
    } catch (final MalformedURLException e) {
      // Should never happen
      throw new AssertionError("Malformed URL from toURI() method");
    }
  }

  public static void addFile(final String s) {
    final File f = new File(s);
    addFile(f);
  }

  public static void addURL(final URL u) {
    final URLClassLoader sysloader = (URLClassLoader) ClassLoader.getSystemClassLoader();
    try {
      /* Class was uncheched, so used URLClassLoader.class instead */
      final Method method = URLClassLoader.class.getDeclaredMethod("addURL", parameters);
      method.setAccessible(true);
      method.invoke(sysloader, new Object[] {u});

      // TODO: Reminder for SP (Log this without using
      // System.out.println("Dynamically added " + u.toString() + " to classLoader");
    } catch (final Exception e) {
      e.printStackTrace();
    }
  }
}