package org.apache.ibatis.reflection;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.UndeclaredThrowableException;

/**

 * @author Clinton Begin

 */

public class ExceptionUtil {

  private ExceptionUtil() {

    // Prevent Instantiation

  }

  public static Throwable unwrapThrowable(Throwable wrapped) {

    Throwable unwrapped = wrapped;

    while (true) {

      if (unwrapped instanceof InvocationTargetException) {

        unwrapped = ((InvocationTargetException) unwrapped).getTargetException();

      } else if (unwrapped instanceof UndeclaredThrowableException) {

        unwrapped = ((UndeclaredThrowableException) unwrapped).getUndeclaredThrowable();

      } else {

        return unwrapped;

      }

    }

  }

}