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

Specified by:

filter in interface FilterStrategy