org.jpox.store.mapped.scostore
Interface ArrayStoreQueryable

public interface ArrayStoreQueryable

Interface representation of the querying capabilities of a backing store for an array. This is part of the JDOQL "expression" design that will be refactored out when the new query engine replaces it.

Method Summary

QueryExpression	getExistsSubquery(QueryExpression stmt, JavaTypeMapping ownerMapping, LogicSetExpression ownerTe, DatastoreIdentifier collRangeVar) Create a subquery for the given query that joins a SetStore element table to the owner table.
QueryExpression	getSizeSubquery(QueryExpression stmt, JavaTypeMapping ownerMapping, LogicSetExpression ownerTe, DatastoreIdentifier collRangeVar) Create a subquery for the size of the collection.
ScalarExpression	joinElementsTo(QueryExpression stmt, QueryExpression parentStmt, JavaTypeMapping ownerMapping, LogicSetExpression ownerTe, DatastoreIdentifier collRangeVar, java.lang.Class filteredElementType, ScalarExpression elmExpr, DatastoreIdentifier elementRangeVar) Method used in queries when contains() has been invoked.

Method Detail

getExistsSubquery

QueryExpression getExistsSubquery(QueryExpression stmt,
                                  JavaTypeMapping ownerMapping,
                                  LogicSetExpression ownerTe,
                                  DatastoreIdentifier collRangeVar)

Create a subquery for the given query that joins a SetStore element table to the owner table. This subquery can subsequently be used in an EXISTS expression to determine whether a Collection is empty.

Parameters:

stmt - The Query Statement.

ownerMapping - the mapping for the owner.

ownerTe - Table Expression for the owner

collRangeVar - The range variable for the "Collection" table.

Returns:

A subquery for the given query that joins a SetStore element table to the owner table.

getSizeSubquery

QueryExpression getSizeSubquery(QueryExpression stmt,
                                JavaTypeMapping ownerMapping,
                                LogicSetExpression ownerTe,
                                DatastoreIdentifier collRangeVar)

Create a subquery for the size of the collection.

Parameters:

stmt - The Query Statement

ownerMapping - Mapping for the owner

ownerTe - Table Expression for the owner

collRangeVar - Range variable for the owner

Returns:

The subquery

joinElementsTo

ScalarExpression joinElementsTo(QueryExpression stmt,
                                QueryExpression parentStmt,
                                JavaTypeMapping ownerMapping,
                                LogicSetExpression ownerTe,
                                DatastoreIdentifier collRangeVar,
                                java.lang.Class filteredElementType,
                                ScalarExpression elmExpr,
                                DatastoreIdentifier elementRangeVar)

Method used in queries when contains() has been invoked.

Parameters:

stmt - The Query Statement

parentStmt - the parent Query Statement. If there is no parent, parentStmt must be equals to stmt

ownerMapping - the mapping for the owner.

ownerTe - Table Expression for the owner

collRangeVar - The range variable for the "Collection" table.

filteredElementType - The Class Type for the filtered element

elmExpr - The Expression for the element

elementRangeVar - The SQL alias, or "range variable", to assign to the expression or to the element table.

Returns:

expression to the join