code: private void populateOperators() {
  		operators = new HashMap();
  
  		registerContentOperator("q", new PushGraphicsState());
  		registerContentOperator("Q", new PopGraphicsState());
  		registerContentOperator("cm", new ModifyCurrentTransformationMatrix());
  		registerContentOperator("gs", new ProcessGraphicsStateResource());
  
  		registerContentOperator("Tc", new SetTextCharacterSpacing());
  		registerContentOperator("Tw", new SetTextWordSpacing());
  		registerContentOperator("Tz", new SetTextHorizontalScaling());
  		registerContentOperator("TL", new SetTextLeading());
  		registerContentOperator("Tf", new SetTextFont());
  		registerContentOperator("Tr", new SetTextRenderMode());
  		registerContentOperator("Ts", new SetTextRise());
  
  		registerContentOperator("BT", new BeginText());
  		registerContentOperator("ET", new EndText());
  
  		registerContentOperator("Td", new TextMoveStartNextLine());
  		registerContentOperator("TD", new TextMoveStartNextLineWithLeading());
  		registerContentOperator("Tm", new TextSetTextMatrix());
  		registerContentOperator("T*", new TextMoveNextLine());
  
  		registerContentOperator("Tj", new ShowText());
  		registerContentOperator("'", new MoveNextLineAndShowText());
  		registerContentOperator("\"", new MoveNextLineAndShowTextWithSpacing());
  		registerContentOperator("TJ", new ShowTextArray());
  
  		registerContentOperator("Do", new Do());
  	}
docs: Loads all the supported graphics and text state operators in a map.