return (Indices.usedDatastructure != Indices.DATA_STRUCT.DBBPTREE) ? null
: Collections
.synchronizedMap(new lupos.datastructures.paged_dbbptree.DBBPTree<String, VarBucket[]>(
1000,
1000,
new StringVarBucketArrayNodeDeSerializer()));
} catch (final IOException e) {
System.err.println(e);
e.printStackTrace();
}
return null;