code: @Override
  	public void configure(Configuration parameters) {
  		// get the file path
  		String filePath = parameters.getString(FILE_PARAMETER_KEY, null);
  		if (filePath != null) {
  			try {
  				this.filePath = new Path(filePath);
  			}
  			catch (RuntimeException rex) {
  				throw new RuntimeException("Could not create a valid URI from the given file path name: " + rex.getMessage()); 
  			}
  		}
  		else if (this.filePath == null) {
  			throw new IllegalArgumentException("File path was not specified in input format, or configuration."); 
  		}
  	}
docs: Configures the file input format by reading the file path from the configuration.
  
  @see eu.stratosphere.api.common.io.InputFormat#configure(eu.stratosphere.configuration.Configuration)