@Override
public void end(Object element, Renderer renderer) {
RenderingContext context = renderer.getRenderingContext();
// retrieve the "before" and "after" visiting states of the knitting
// engine so that we have something to go back to
Object beforeVisitingEngineState = context.getPatternState().retrieveSavedEngineState();
Object afterVisitingEngineState = context.getEngine().save();
// start with the state before the instruction was sent through the
// engine
renderer.getRenderingContext().getEngine().restore(beforeVisitingEngineState);
// retrieve the instruction from the knitting context's repository
// rather than the instruction from the document, as the rows
// may have been expanded.
PatternRepository repository = context.getPatternRepository();
Instruction instruction = (Instruction) element;
String id = instruction.getId();
Instruction candidateInstruction =
context.getKnittingContext().getPatternRepository().getBlockInstruction(id);
// have the renderer evaluate the instruction and return a different
// instruction if it wants to change anything. Pass it a sibling
// repeat-instruction
// if it can be found.
Instruction instructionToUse =
renderer.evaluateInstruction(
candidateInstruction, findSiblingRepeatInstruction(instruction, renderer));
// if the renderer didn't alter anything, it returns null
if (instructionToUse == null) {
instructionToUse = candidateInstruction;
}
InstructionInfo instructionInfo;
if (instructionToUse.hasLabelOrMessageKey()) {
instructionInfo =
deriveInstructionInfo(instructionToUse, deriveLabel(instruction, repository));
repository.addGlobalInstruction(instructionInfo);
} else {
instructionInfo = deriveInstructionInfo(instructionToUse, null);
repository.addLocalInstruction(instructionInfo);
}
context.getPatternState().setCurrentInstructionInfo(instructionInfo);
if (instructionInfo.getRowRange() != null) {
setLastExpressedRowNumber(instructionInfo.getRowRange().getMaximumInteger(), context);
// if setLastExpressedRowNumber resets the local instructions, this
// would also clear out the currently executing instruction. We
// don't want that to happen, so add it back in.
// FIXME this is really backwards; maybe we should redo this
if (repository.getInstruction(instruction.getId()) == null) {
repository.addLocalInstruction(instructionInfo);
}
}
renderer.beginInstruction(instructionInfo);
InstructionController embeddedController = new InstructionController(getEventHandlerFactory());
embeddedController.visitInstruction(instructionToUse, renderer);
context.getPatternState().clearCurrentInstructionInfo();
renderer.endInstruction();
// restore to the way things were (after engine processing but before
// this method was called)
renderer.getRenderingContext().getEngine().restore(afterVisitingEngineState);
}
