public ContextRegisterFilter getFilter() {
		if (isCanceled) {
			return null;
		}
		ContextRegisterFilter registerFilter = new ContextRegisterFilter();
		for (String currentRegister : regsToBoxes.keySet()) {
			BigInteger value =
				((RegisterValueWrapper) regsToBoxes.get(currentRegister).getSelectedItem())
						.getValue();
			if (value != null) {
				registerFilter.addRegAndValueToFilter(currentRegister, value);
			}
		}
		return registerFilter;
	}
Creates a {@link ContextRegisterFilter} based on the values entered by the user
@return the {@link ContextRegisterFilter}
Ghidra/Features/BytePatterns/src/main/java/ghidra/bitpatterns/gui/ContextRegisterFilterInputDialog.java