/**
* constructor
*
* @param file_name heapfile to be opened
* @param in1[] array showing what the attributes of the input fields are.
* @param s1_sizes[] shows the length of the string fields.
* @param len_in1 number of attributes in the input tuple
* @param n_out_flds number of fields in the out tuple
* @param proj_list shows what input fields go where in the output tuple
* @param outFilter select expressions
* @exception IOException some I/O fault
* @exception FileScanException exception from this class
* @exception TupleUtilsException exception from this class
* @exception InvalidRelation invalid relation
*/
public FileScan(
String file_name,
AttrType in1[],
short s1_sizes[],
short len_in1,
int n_out_flds,
FldSpec[] proj_list,
CondExpr[] outFilter)
throws IOException, FileScanException, TupleUtilsException, InvalidRelation {
_in1 = in1;
in1_len = len_in1;
s_sizes = s1_sizes;
Jtuple = new Tuple();
AttrType[] Jtypes = new AttrType[n_out_flds];
short[] ts_size;
ts_size =
TupleUtils.setup_op_tuple(Jtuple, Jtypes, in1, len_in1, s1_sizes, proj_list, n_out_flds);
OutputFilter = outFilter;
perm_mat = proj_list;
nOutFlds = n_out_flds;
tuple1 = new Tuple();
try {
tuple1.setHdr(in1_len, _in1, s1_sizes);
} catch (Exception e) {
throw new FileScanException(e, "setHdr() failed");
}
t1_size = tuple1.size();
try {
f = new Heapfile(file_name);
} catch (Exception e) {
throw new FileScanException(e, "Create new heapfile failed");
}
try {
scan = f.openScan();
} catch (Exception e) {
throw new FileScanException(e, "openScan() failed");
}
}
/**
* @return the result tuple
* @exception JoinsException some join exception
* @exception IOException I/O errors
* @exception InvalidTupleSizeException invalid tuple size
* @exception InvalidTypeException tuple type not valid
* @exception PageNotReadException exception from lower layer
* @exception PredEvalException exception from PredEval class
* @exception UnknowAttrType attribute type unknown
* @exception FieldNumberOutOfBoundException array out of bounds
* @exception WrongPermat exception for wrong FldSpec argument
*/
public Tuple get_next()
throws JoinsException, IOException, InvalidTupleSizeException, InvalidTypeException,
PageNotReadException, PredEvalException, UnknowAttrType, FieldNumberOutOfBoundException,
WrongPermat {
RID rid = new RID();
;
while (true) {
if ((tuple1 = scan.getNext(rid)) == null) {
return null;
}
tuple1.setHdr(in1_len, _in1, s_sizes);
if (PredEval.Eval(OutputFilter, tuple1, null, _in1, null) == true) {
Projection.Project(tuple1, _in1, Jtuple, perm_mat, nOutFlds);
return Jtuple;
}
}
}
// 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");
}
}
}
};