@Override
	public boolean isDescendant(ProgramFragment fragment) {
		if (!(fragment instanceof FragmentDB)) {
			return false;
		}
		lock.acquire();
		try {
			checkIsValid();
			FragmentDB frag = (FragmentDB) fragment;
			return moduleMgr.isDescendant(-frag.getKey(), key);
		}
		catch (IOException e) {
			moduleMgr.dbError(e);
		}
		finally {
			lock.release();
		}
		return false;
	}
Constructor
@param moduleMgr module manager
@param cache ModuleDB cache
@param record database record for this module
@throws IOException if database IO error occurs
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/module/ModuleDB.java