org.datanucleus.query.evaluator
Class JavaQueryEvaluator

java.lang.Object
  org.datanucleus.query.evaluator.JavaQueryEvaluator

Direct Known Subclasses:

JDOQLEvaluator, JPQLEvaluator

public abstract class JavaQueryEvaluator
extends java.lang.Object

Class to evaluate a Java "string-based" query in whole or part. Takes in a list of instances and applies the required restrictions to the input giving a final result. Typically extended for JDOQL, JPQL, SQL specifics.

Field Summary

protected java.lang.String	candidateAlias
protected ClassLoaderResolver	clr
protected InMemoryExpressionEvaluator	evaluator
protected Expression	filter
protected Expression[]	grouping
protected Expression	having
protected java.lang.String	language
protected static Localiser	LOCALISER Localisation utility for output messages
protected Expression[]	ordering
protected java.util.Map	parameterValues
protected Query	query Underlying "string-based" query.
protected Expression[]	result
protected java.util.List	sourceObjects List of input objects.
protected SymbolTable	symtbl

Constructor Summary

JavaQueryEvaluator(java.lang.String language)
Constructor for the evaluator of a query in the specified language.

Method Summary

java.util.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

Field Detail

LOCALISER

protected static final Localiser LOCALISER

Localisation utility for output messages

language

protected final java.lang.String language

candidateAlias

protected java.lang.String candidateAlias

filter

protected Expression filter

result

protected Expression[] result

ordering

protected Expression[] ordering

grouping

protected Expression[] grouping

having

protected Expression having

symtbl

protected SymbolTable symtbl

evaluator

protected InMemoryExpressionEvaluator evaluator

parameterValues

protected java.util.Map parameterValues

sourceObjects

protected java.util.List sourceObjects

List of input objects.

query

protected Query query

Underlying "string-based" query.

clr

protected ClassLoaderResolver clr

Constructor Detail

JavaQueryEvaluator

public JavaQueryEvaluator(java.lang.String language)

Constructor for the evaluator of a query in the specified language.

Parameters:

language - Name of the language

Method Detail

execute

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

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

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.