code: @Override
  	public InputSplit[] computeInputSplits(int requestedMinNumber) throws Exception {
  		// we have to be sure that the format is instantiated at this point
  		if (this.format == null) {
  			throw new IllegalStateException("BUG: Input format hast not been instantiated, yet.");
  		}
  		return this.format.createInputSplits(requestedMinNumber);
  	}
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