org.javarosa.core.model

Class IdempotentExpressionCacheFilterStrategy

java.lang.Object

org.javarosa.core.model.IdempotentExpressionCacheFilterStrategy

All Implemented Interfaces:

FilterStrategy

public class IdempotentExpressionCacheFilterStrategy
extends Object
implements FilterStrategy

Caches down stream evaluations (in the FilterStrategy chain) for "idempotent" (with respect to current form state) predicates. Can only be used for static instances or in cases where form state won't change - will cause clashes otherwise. Repeated evaluations are fetched in O(1) time.

Constructor Summary

Constructors

Constructor and Description
IdempotentExpressionCacheFilterStrategy()

Method Summary

Modifier and Type	Method and Description
List<TreeReference>	filter(DataInstance sourceInstance, TreeReference nodeSet, XPathExpression predicate, List<TreeReference> children, EvaluationContext evaluationContext, Supplier<List<TreeReference>> next)

Methods inherited from class java.lang.Object

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

Constructor Detail

IdempotentExpressionCacheFilterStrategy

public IdempotentExpressionCacheFilterStrategy()

Method Detail

filter

@NotNull
public List<TreeReference> filter(@NotNull
                                           DataInstance sourceInstance,
                                           @NotNull
                                           TreeReference nodeSet,
                                           @NotNull
                                           XPathExpression predicate,
                                           @NotNull
                                           List<TreeReference> children,
                                           @NotNull
                                           EvaluationContext evaluationContext,
                                           @NotNull
                                           Supplier<List<TreeReference>> next)

Specified by:

filter in interface FilterStrategy