org.datanucleus.query.evaluator

Class JPQLEvaluator

java.lang.Object

org.datanucleus.query.evaluator.JavaQueryEvaluator

org.datanucleus.query.evaluator.JPQLEvaluator

public class JPQLEvaluator
extends JavaQueryEvaluator

Class to evaluate a JPQL query in whole or part.

Field Summary

Fields inherited from class org.datanucleus.query.evaluator.JavaQueryEvaluator

candidateAlias, candidates, clr, compilation, evaluator, language, parameterValues, query, RESULTS_SET, state

Constructor Summary

Constructors

Constructor and Description
JPQLEvaluator(Query query, Collection candidates, QueryCompilation compilation, Map parameterValues, ClassLoaderResolver clr) Constructor.

Method Summary

Modifier and Type	Method and Description
protected Collection	evaluateSubquery(Query query, QueryCompilation compilation, Collection candidates, Object outerCandidate) Method to evaluate a subquery of the query being evaluated.
Collection	execute(boolean applyFilter, boolean applyOrdering, boolean applyResult, boolean applyResultClass, boolean applyRange) Method to perform the evaluation, applying the query restrictions that are required.

Methods inherited from class java.lang.Object

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

Constructor Detail

JPQLEvaluator

public JPQLEvaluator(Query query,
                     Collection candidates,
                     QueryCompilation compilation,
                     Map parameterValues,
                     ClassLoaderResolver clr)

Constructor.

Parameters:

query - The underlying JPQL query

candidates - List of objects as input to the evaluation process

compilation - Compiled query

parameterValues - Input parameter values

clr - ClassLoader resolver

Method Detail

evaluateSubquery

protected Collection evaluateSubquery(Query query,
                                      QueryCompilation compilation,
                                      Collection candidates,
                                      Object outerCandidate)

Method to evaluate a subquery of the query being evaluated.

Specified by:

evaluateSubquery in class JavaQueryEvaluator

Parameters:

query - The subquery

compilation - The subquery compilation

candidates - The candidates for the subquery

outerCandidate - Current candidate in the outer query (for use when linking back)

Returns:

The result

execute

public Collection execute(boolean applyFilter,
                          boolean applyOrdering,
                          boolean applyResult,
                          boolean applyResultClass,
                          boolean applyRange)

Description copied from class: JavaQueryEvaluator

Method to perform the evaluation, applying the query restrictions that are required.

Overrides:

execute in class JavaQueryEvaluator

Parameters:

applyFilter - Whether to apply any filter constraints on the results

applyOrdering - Whether to apply any order constraints on the results

applyResult - Whether to apply any result/grouping/having on the results

applyResultClass - Whether to apply any resultClass constraint on the results

applyRange - Whether to apply any range constraint on the results

Returns:

The results after evaluation.