has_uri_scheme
  
  Description:
  public abstract bool has_uri_scheme (
string uri_scheme)
  
 
  
    Checks to see if a File has a given URI scheme.
    This call does no blocking I/O.
    Parameters:
    
      
        | this | 
        
           input File 
         | 
      
      
        | uri_scheme | 
        
           a string containing a URI scheme 
         | 
      
    
    Returns:
    
      
        | 
           true if File's backend supports the  given URI 
            scheme, false if URI scheme is null,  not supported, or 
            File is invalid. 
         |