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package edu.stanford.nlp.util;

/**
 * The goal of this class is to make it easier to load stuff by
 * reflection.  You can hide all of the ugly exception catching, etc
 * by using the static methods in this class.
 *
 * @author John Bauer
 * @author Gabor Angeli (changed)
 */

public class ReflectionLoading {

  // static methods only
  private ReflectionLoading() {}

  /**
   * You can use this as follows:
   * 

   *  String s =
   *    ReflectionLoading.loadByReflection("java.lang.String", "foo");
   * 

   *  String s =
   *    ReflectionLoading.loadByReflection("java.lang.String");
   * 

   * Note that this uses generics for convenience, but this does
   * nothing for compile-time error checking.  You can do
   * 

   *  Integer i =
   *    ReflectionLoading.loadByReflection("java.lang.String");
   * 

   * and it will compile just fine, but will result in a ClassCastException.
   */
  @SuppressWarnings("unchecked")
  public static  T loadByReflection(String className,
                                       Object ... arguments) {
    try{
      return (T) new MetaClass(className).createInstance(arguments);
    } catch (Exception e) {
      throw new ReflectionLoadingException("Error creating " + className, e);
    }
  }

  /**
   * This class encapsulates all of the exceptions that can be thrown
   * when loading something by reflection.
   */
  public static class ReflectionLoadingException extends RuntimeException {

    private static final long serialVersionUID = -3324911744277952585L;


    public ReflectionLoadingException(String message, Throwable reason) {
      super(message, reason);
    }

  }

}