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replace random by strategic specimen-selection
Instead of picking a random implementation candidate for an abstract type at build-time of the specimen, all matching candidates are passed to the specimen and iterated over at creation-time until a suitable implementation is found. This allows to try multiple implementations and to fall back to a proxy if none of the candidates can be manufactured.
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101 changes: 101 additions & 0 deletions
101
src/main/java/com/github/nylle/javafixture/specimen/ExperimentalAbstractSpecimen.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| package com.github.nylle.javafixture.specimen; | ||
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| import com.github.nylle.javafixture.Context; | ||
| import com.github.nylle.javafixture.CustomizationContext; | ||
| import com.github.nylle.javafixture.ISpecimen; | ||
| import com.github.nylle.javafixture.InstanceFactory; | ||
| import com.github.nylle.javafixture.SpecimenException; | ||
| import com.github.nylle.javafixture.SpecimenFactory; | ||
| import com.github.nylle.javafixture.SpecimenType; | ||
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| import java.lang.annotation.Annotation; | ||
| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Optional; | ||
| import java.util.stream.Stream; | ||
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| public class ExperimentalAbstractSpecimen<T> implements ISpecimen<T> { | ||
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| private final SpecimenType<T> type; | ||
| private final Context context; | ||
| private final SpecimenFactory specimenFactory; | ||
| private final InstanceFactory instanceFactory; | ||
| private final List<SpecimenType<? extends T>> derivedTypes; | ||
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| public ExperimentalAbstractSpecimen(SpecimenType<T> type, List<SpecimenType<? extends T>> derivedTypes, Context context, SpecimenFactory specimenFactory) { | ||
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| if (type == null) { | ||
| throw new IllegalArgumentException("type: null"); | ||
| } | ||
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| if (derivedTypes == null) { | ||
| throw new IllegalArgumentException("derivedTypes: null"); | ||
| } | ||
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| if (context == null) { | ||
| throw new IllegalArgumentException("context: null"); | ||
| } | ||
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| if (specimenFactory == null) { | ||
| throw new IllegalArgumentException("specimenFactory: null"); | ||
| } | ||
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| if (isNotAbstract(type) || isCollection(type)) { | ||
| throw new IllegalArgumentException("type: " + type.getName()); | ||
| } | ||
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| this.type = type; | ||
| this.context = context; | ||
| this.specimenFactory = specimenFactory; | ||
| this.instanceFactory = new InstanceFactory(specimenFactory); | ||
| this.derivedTypes = derivedTypes; | ||
| } | ||
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| @Override | ||
| public T create(CustomizationContext customizationContext, Annotation[] annotations) { | ||
| if (context.isCached(type)) { | ||
| return context.cached(type); | ||
| } | ||
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| return context.cached(type, shuffledStream(derivedTypes) | ||
| .map(derivedType -> specimenFactory.build(derivedType)) | ||
| .flatMap(derivedSpecimen -> tryCreate(derivedSpecimen, customizationContext, annotations).stream()) | ||
| .findFirst() | ||
| .orElseGet(() -> proxy(customizationContext))); | ||
| } | ||
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| private <R extends T> R proxy(CustomizationContext customizationContext) { | ||
| try { | ||
| return (R) instanceFactory.proxy(type); | ||
| } catch(SpecimenException ex) { | ||
| if(type.isAbstract()) { | ||
| return (R) instanceFactory.manufacture(type, customizationContext); | ||
| } | ||
| throw ex; | ||
| } | ||
| } | ||
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| private static <T> Optional<T> tryCreate(ISpecimen<T> specimen, CustomizationContext customizationContext, Annotation[] annotations) { | ||
| try { | ||
| return Optional.of(specimen.create(customizationContext, annotations)); | ||
| } catch(Exception ex) { | ||
| return Optional.empty(); | ||
| } | ||
| } | ||
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| private static <T> boolean isNotAbstract(SpecimenType<T> type) { | ||
| return !(type.isAbstract() || type.isInterface()); | ||
| } | ||
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| private static <T> boolean isCollection(SpecimenType<T> type) { | ||
| return type.isMap() || type.isCollection(); | ||
| } | ||
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| private static <T> Stream<SpecimenType<? extends T>> shuffledStream(List<SpecimenType<? extends T>> list) { | ||
| var copy = new ArrayList<>(list); | ||
| Collections.shuffle(copy); | ||
| return copy.stream(); | ||
| } | ||
| } | ||
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