// ADD INDEX TO A RELATION
public void addIndex(String relation, String attrName, IndexType accessType, int buckets)
throws IOException, Catalogioerror, Cataloghferror, Catalogmissparam, Catalogattrnotfound,
Catalogbadtype, Catalognomem, Catalogindexnotfound, IndexCatalogException,
java.lang.Exception {
RID rid = null;
IndexDesc indexRec = null;
AttrDesc attrRec = null;
int intKey = 0;
float floatKey = (float) 0.0;
String charKey = null;
int attrCnt = 0;
KeyClass key = null;
int recSize = 0;
Heapfile datafile = null;
String indexName = null;
Tuple tuple = null;
BTreeFile btree = null;
Scan pscan = null;
AttrType[] typeArray = null;
short[] sizeArray = null;
// CHECK PARM
if ((relation == null) || (attrName == null)) throw new Catalogmissparam(null, "MISSING_PARAM");
// CHECK FOR EXISTING INDEX
try {
getInfo(relation, attrName, accessType, indexRec);
} catch (Catalogioerror e) {
System.err.println("Catalog I/O Error!" + e);
throw new Catalogioerror(null, "");
} catch (Cataloghferror e1) {
System.err.println("Catalog Heapfile Error!" + e1);
throw new Cataloghferror(null, "");
} catch (Catalogmissparam e2) {
System.err.println("Catalog Missing Param Error!" + e2);
throw new Catalogmissparam(null, "");
}
// GET ATTRIBUTE INFO
try {
ExtendedSystemDefs.MINIBASE_ATTRCAT.getInfo(relation, attrName, attrRec);
} catch (Exception e2) {
throw new IndexCatalogException(e2, "getInfo() failed");
}
// Can only index on int's and strings currently
if ((attrRec.attrType.attrType != AttrType.attrInteger)
&& (attrRec.attrType.attrType != AttrType.attrString))
throw new Catalogbadtype(null, "Catalog: BAD TYPE!");
// UPDATE ATTRIBUTE INFO
attrRec.indexCnt++;
try {
ExtendedSystemDefs.MINIBASE_ATTRCAT.removeInfo(relation, attrName);
ExtendedSystemDefs.MINIBASE_ATTRCAT.addInfo(attrRec);
} catch (Exception e) {
throw new IndexCatalogException(e, "add/remove info failed");
}
// BUILD INDEX FILE NAME
indexName = buildIndexName(relation, attrName, accessType);
// ADDED BY BILL KIMMEL - DELETE LATER
System.out.println("Index name is " + indexName);
// IF BTREE
if (accessType.indexType == IndexType.B_Index) {
btree = new BTreeFile(indexName, attrRec.attrType.attrType, attrRec.attrLen, 0);
}
// ADD ENTRY IN INDEXCAT
indexRec.relName = new String(relation);
indexRec.attrName = new String(attrName);
indexRec.accessType = accessType;
if (accessType.indexType == IndexType.B_Index)
indexRec.order = new TupleOrder(TupleOrder.Ascending);
else indexRec.order = new TupleOrder(TupleOrder.Random);
indexRec.distinctKeys = DISTINCTKEYS;
indexRec.clustered = 0; // 0 means non-clustered!!!!
indexRec.indexPages = INDEXPAGES;
try {
addInfo(indexRec);
} catch (Exception e) {
throw new IndexCatalogException(e, "addInfo() failed");
}
// PREPARE TO SCAN DATA FILE
try {
datafile = new Heapfile(relation);
if (datafile == null) throw new Catalognomem(null, "NO Enough Memory!");
} catch (Exception e) {
throw new IndexCatalogException(e, "create heapfile failed");
}
try {
pscan = datafile.openScan();
} catch (Exception e) {
throw new IndexCatalogException(e, "openScan() failed");
}
// PREPARE TUPLE
try {
ExtendedSystemDefs.MINIBASE_ATTRCAT.getTupleStructure(
relation, attrCnt, typeArray, sizeArray);
} catch (Exception e) {
throw new IndexCatalogException(e, "getTupleStructure");
}
tuple = new Tuple(Tuple.max_size);
if (tuple == null) throw new Catalognomem(null, "Catalog, No Enough Memory!");
try {
tuple.setHdr((short) attrCnt, typeArray, sizeArray);
} catch (Exception e) {
throw new IndexCatalogException(e, "setHdr() failed");
}
recSize = tuple.size();
// NOW PROCESS THE HEAPFILE AND INSERT KEY,RID INTO INDEX
while (true) {
try {
tuple = pscan.getNext(rid);
if (tuple == null) return;
} catch (Exception e) {
throw new IndexCatalogException(e, "getNext() failed");
}
// PULL OUT THE KEY VALUE FROM HEAPFILE RECORD
if (attrRec.attrType.attrType == AttrType.attrInteger) {
intKey = tuple.getIntFld(attrRec.attrPos);
key = new IntegerKey(intKey);
} else if (attrRec.attrType.attrType == AttrType.attrReal) {
floatKey = tuple.getFloFld(attrRec.attrPos);
key = new IntegerKey((int) floatKey);
} else if (attrRec.attrType.attrType == AttrType.attrString) {
charKey = new String(tuple.getStrFld(attrRec.attrPos));
key = new StringKey(charKey);
}
// NOW INSERT RECORD INTO INDEX
if (accessType.indexType == IndexType.B_Index) {
try {
btree.insert(key, rid);
} catch (Exception e) {
throw new IndexCatalogException(e, "insert failed");
}
}
}
};
// GET ALL INDEXES INLUDING A SPECIFIED ATTRIBUTE
public int getAttrIndexes(String relation, String attrName, int indexCnt, IndexDesc[] indexes)
throws Catalogmissparam, Catalogioerror, Cataloghferror, IOException, Catalognomem,
Catalogindexnotfound, Catalogattrnotfound, IndexCatalogException {
AttrDesc record = null;
int status;
int recSize;
RID rid = null;
Scan pscan = null;
int count = 0;
if (relation == null) throw new Catalogmissparam(null, "MISSING_PARAM");
try {
ExtendedSystemDefs.MINIBASE_ATTRCAT.getInfo(relation, attrName, record);
} catch (Catalogioerror e) {
throw e;
} catch (Cataloghferror e1) {
throw e1;
} catch (Catalogmissparam e2) {
throw e2;
} catch (Catalogattrnotfound e3) {
throw e3;
} catch (Exception e4) {
throw new IndexCatalogException(e4, "getInfo() failed");
}
// ASSIGN INDEX COUNT
indexCnt = record.indexCnt;
if (indexCnt == 0) return 0;
// OPEN SCAN
try {
pscan = new Scan(this);
} catch (Exception e) {
throw new IndexCatalogException(e, "scan failed");
}
// ALLOCATE INDEX ARRAY
indexes = new IndexDesc[indexCnt];
if (indexes == null) throw new Catalognomem(null, "Catalog: No Enough Memory!");
// SCAN FILE
while (true) {
try {
tuple = pscan.getNext(rid);
if (tuple == null) throw new Catalogindexnotfound(null, "Catalog: Index not Found!");
read_tuple(tuple, indexes[count]);
} catch (Exception e4) {
throw new IndexCatalogException(e4, "pascan.getNext() failed");
}
if (indexes[count].relName.equalsIgnoreCase(relation) == true
&& indexes[count].attrName.equalsIgnoreCase(attrName) == true) count++;
if (count == indexCnt) // if all indexes found
break;
}
return indexCnt;
};