* scans the directory and builds up the IndexManager and DataManager
* @throws IOException
*/
private void generateInterestInMapDataFiles() throws IOException {
for (Iterator i = mapsContainer.getKeys().iterator(); i.hasNext();) {
ContainerId id = (ContainerId)i.next();
DataManager dm = getDataManager(id.getDataContainerName());
IndexManager im = getIndexManager(dm,id.getDataContainerName());
IndexItem theRoot=mapsContainer.getRoot(im,id);
long nextItem=theRoot.getNextItem();
while(nextItem!=Item.POSITION_NOT_SET){
IndexItem item=im.getIndex(nextItem);
item.setOffset(nextItem);