package locklib;
   
   import ensure.Ensure;
   
   /**
    * Request for a lock. A lock request contains the type of lock requested and
    * the holder requesting the lock.
    * @param <LockType> the type of lock
    */
  public class LockRequest<LockType> {
  	/**
  	 * Type of lock requested.
  	 */
  	private LockType m_type;
  	
  	/**
  	 * Holder requesting the lock.
  	 */
  	private Object m_holder;
  	
  	/**
  	 * Creates a new lock request.
  	 * @param type the type of lock
  	 * @param h the holder requesting the lock
  	 */
  	public LockRequest(LockType type, Object h) {
  		Ensure.not_null(type, "type == null");
  		Ensure.not_null(h, "h == null");
  		
  		m_type = type;
  		m_holder = h;
  	}
  	
  	/**
  	 * Obtains the type of lock.
  	 * @return the type of lock
  	 */
  	public LockType type() {
  		return m_type;
  	}
  	
  	/**
  	 * Obtains the holder of the lock.
  	 * @return the holder of the lock
  	 */
  	public Object holder() {
  		return m_holder;
  	}
  	
  	@Override
  	public String toString() {
  		return "LockRequest[type=" + m_type + ", holder=" + m_holder + "]";
  	}
  }