/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * 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.mvel2.util;

import sun.misc.Unsafe;

import java.lang.reflect.Field;

public class JITClassLoader extends ClassLoader implements MVELClassLoader {
  private static boolean sunJVM;
  private static Object sunUnsafe;

  static {
    try {
      Field f = Unsafe.class.getDeclaredField("theUnsafe");
      f.setAccessible(true);
      sunUnsafe = f.get(null);
      sunJVM = true;
    }
    catch (Throwable t) {
      //      t.printStackTrace();
      sunJVM = false;
    }
  }


  public JITClassLoader(ClassLoader classLoader) {
    super(classLoader);
  }

  public Class<?> defineClassX(String className, byte[] b, int off, int len) {
    if (sunJVM) {
      return ((Unsafe) sunUnsafe).defineClass(className, b, off, len);
    }
    else {
      return super.defineClass(className, b, off, len);
    }
  }
}
