void initialize(Program program, Function function) {
		if (program == null) { // no program open
			setLocation(null);
			return;
		}

		currentProgram = program;
		currentProgram.addListener(domainObjectListener);
		doSetFunction(function);
	}
A variable used to restrict open-ended operations, like expanding all nodes or filtering.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/calltree/CallTreeProvider.java