/**
* This helper method handles the case when a tuple is being removed from the table, before the
* row has actually been removed from the table. All indexes on the table are updated to remove
* the row.
*
* @param tblFileInfo details of the table being updated
* @param ptup the tuple about to be removed from the table
*/
private void removeRowFromIndexes(TableInfo tblFileInfo, PageTuple ptup) {
logger.debug(
"Removing tuple " + ptup + " from indexes for table " + tblFileInfo.getTableName());
// Iterate over the indexes in the table.
TableSchema schema = tblFileInfo.getSchema();
for (ColumnRefs indexDef : schema.getIndexes().values()) {
TupleLiteral idxTup =
IndexUtils.makeSearchKeyValue(indexDef, ptup, /* findExactTuple */ true);
logger.debug("Removing tuple " + idxTup + " from index " + indexDef.getIndexName());
try {
IndexInfo indexInfo = indexManager.openIndex(tblFileInfo, indexDef.getIndexName());
TupleFile tupleFile = indexInfo.getTupleFile();
PageTuple idxPageTup = IndexUtils.findTupleInIndex(idxTup, tupleFile);
if (idxPageTup == null) {
throw new IllegalStateException(
"Can't find tuple in " + "index corresponding to table's tuple.");
}
tupleFile.deleteTuple(idxPageTup);
} catch (IOException e) {
throw new EventDispatchException(
"Couldn't update index "
+ indexDef.getIndexName()
+ " for table "
+ tblFileInfo.getTableName());
}
}
}
/**
* This helper method handles the case when a tuple is being added to the table, after the row has
* already been added to the table. All indexes on the table are updated to include the new row.
*
* @param tblFileInfo details of the table being updated
* @param ptup the new tuple that was inserted into the table
*/
private void addRowToIndexes(TableInfo tblFileInfo, PageTuple ptup) {
logger.debug("Adding tuple " + ptup + " to indexes for table " + tblFileInfo.getTableName());
// Iterate over the indexes in the table.
TableSchema schema = tblFileInfo.getSchema();
for (ColumnRefs indexDef : schema.getIndexes().values()) {
TupleLiteral idxTup;
try {
IndexInfo indexInfo = indexManager.openIndex(tblFileInfo, indexDef.getIndexName());
TupleFile tupleFile = indexInfo.getTupleFile();
TableConstraintType constraintType = indexDef.getConstraintType();
if (constraintType != null && constraintType.isUnique()) {
// Check if the index already has a tuple with this value.
idxTup = IndexUtils.makeSearchKeyValue(indexDef, ptup, /* findExactTuple */ false);
if (IndexUtils.findTupleInIndex(idxTup, tupleFile) != null) {
// Adding this row would violate the unique index.
throw new IllegalStateException(
"Unique index " + "already contains a tuple with this value.");
}
}
idxTup = IndexUtils.makeSearchKeyValue(indexDef, ptup, /* findExactTuple */ true);
logger.debug("Adding tuple " + idxTup + " to index " + indexDef.getIndexName());
tupleFile.addTuple(idxTup);
} catch (IOException e) {
throw new EventDispatchException(
"Couldn't update index "
+ indexDef.getIndexName()
+ " for table "
+ tblFileInfo.getTableName(),
e);
}
}
}
public TableStats getStats() {
return tupleFile.getStats();
}
/** A helper function to simplify retrieving the table's schema. */
public TableSchema getSchema() {
return tupleFile.getSchema();
}
/** A helper function to simplify retrieving the table's {@code DBFile}. */
public DBFile getDBFile() {
return tupleFile.getDBFile();
}