org.apache.openjpa.persistence.criteria
Class CriteriaExpressionBuilder

java.lang.Object
  org.apache.openjpa.persistence.criteria.CriteriaExpressionBuilder

 class CriteriaExpressionBuilder
extends Object

Converts expressions of a CriteriaQuery to kernel Expression.

Since:

2.0.0

Author:

Pinaki Poddar, Fay Wang

Constructor Summary

CriteriaExpressionBuilder()

Method Summary

protected void	evalAccessPaths(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q)
protected void	evalCrossJoinRoots(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q)
protected void	evalDistinct(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q)
protected void	evalFetchJoin(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q)
protected void	evalFilter(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q)
protected void	evalGrouping(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q)
protected Map<ExpressionImpl<?>,Value>	evalOrdering(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q) Evaluates the ordering expressions by converting them to kernel values.
protected void	evalOrderingAndProjection(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q)
protected void	evalProjections(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q, Map<ExpressionImpl<?>,Value> exp2Vals)
QueryExpressions	getQueryExpressions(ExpressionFactory factory, CriteriaQueryImpl<?> q)
(package private) ResultShape<?>	getShape(CriteriaQueryImpl<?> q, ResultShape<?> parent, Selection<?> s) Gets the shape of a selection item.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CriteriaExpressionBuilder

CriteriaExpressionBuilder()

Method Detail

getQueryExpressions

public QueryExpressions getQueryExpressions(ExpressionFactory factory,
                                            CriteriaQueryImpl<?> q)

evalAccessPaths

protected void evalAccessPaths(QueryExpressions exps,
                               ExpressionFactory factory,
                               CriteriaQueryImpl<?> q)

evalOrderingAndProjection

protected void evalOrderingAndProjection(QueryExpressions exps,
                                         ExpressionFactory factory,
                                         CriteriaQueryImpl<?> q)

evalOrdering

protected Map<ExpressionImpl<?>,Value> evalOrdering(QueryExpressions exps,
                                                    ExpressionFactory factory,
                                                    CriteriaQueryImpl<?> q)

Evaluates the ordering expressions by converting them to kernel values. Sets the ordering fields of kernel QueryExpressions.

Parameters:

exps - kernel QueryExpressions

factory - for kernel expressions

q - a criteria query

Returns:

map of kernel values indexed by criteria query expressions that created it. These kernel values are required to be held in a map to avoid recomputing for the same CriteriaQuery Expressions appearing in ordering terms as well as projection term.

evalGrouping

protected void evalGrouping(QueryExpressions exps,
                            ExpressionFactory factory,
                            CriteriaQueryImpl<?> q)

evalDistinct

protected void evalDistinct(QueryExpressions exps,
                            ExpressionFactory factory,
                            CriteriaQueryImpl<?> q)

evalCrossJoinRoots

protected void evalCrossJoinRoots(QueryExpressions exps,
                                  ExpressionFactory factory,
                                  CriteriaQueryImpl<?> q)

evalFilter

protected void evalFilter(QueryExpressions exps,
                          ExpressionFactory factory,
                          CriteriaQueryImpl<?> q)

evalProjections

protected void evalProjections(QueryExpressions exps,
                               ExpressionFactory factory,
                               CriteriaQueryImpl<?> q,
                               Map<ExpressionImpl<?>,Value> exp2Vals)

evalFetchJoin

protected void evalFetchJoin(QueryExpressions exps,
                             ExpressionFactory factory,
                             CriteriaQueryImpl<?> q)

getShape

ResultShape<?> getShape(CriteriaQueryImpl<?> q,
                        ResultShape<?> parent,
                        Selection<?> s)

Gets the shape of a selection item. Creates the shape if necessary.

Parameters:

q - the original query

parent - the parent shape that nests this given selection

s - the selection term for which a result shape to be computed