com.github.nylle.javafixture.specimen.GenericSpecimen Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of javafixture Show documentation

JavaFixture is the attempt to bring Mark Seemann's AutoFixture for .NET to the Java world. Its purpose is to generate full object graphs for use in test suites with a fluent API for customising the test objects during generation.

There is a newer version: 2.11.0

Show newest version

package com.github.nylle.javafixture.specimen;

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.Reflector;
import com.github.nylle.javafixture.SpecimenException;
import com.github.nylle.javafixture.SpecimenFactory;
import com.github.nylle.javafixture.SpecimenType;

import java.lang.annotation.Annotation;
import java.util.List;
import java.util.Map;
import java.util.stream.IntStream;

import static java.util.stream.Collectors.toMap;

public class GenericSpecimen implements ISpecimen {

    private final SpecimenType type;
    private final Context context;
    private final SpecimenFactory specimenFactory;
    private final InstanceFactory instanceFactory;
    private final Map> specimens;

    public GenericSpecimen(SpecimenType type, Context context, SpecimenFactory specimenFactory) {

        if (type == null) {
            throw new IllegalArgumentException("type: null");
        }

        if (context == null) {
            throw new IllegalArgumentException("context: null");
        }

        if (specimenFactory == null) {
            throw new IllegalArgumentException("specimenFactory: null");
        }

        if (!type.isParameterized()) {
            throw new IllegalArgumentException("type: " + type.getName());
        }

        if (type.isCollection() || type.isMap()) {
            throw new IllegalArgumentException("type: " + type.getName());
        }

        this.type = type;
        this.context = context;
        this.specimenFactory = specimenFactory;
        this.instanceFactory = new InstanceFactory(specimenFactory);

        this.specimens = IntStream.range(0, type.getGenericTypeArguments().length)
                .boxed()
                .collect(toMap(
                        i -> type.getTypeParameterName(i),
                        i -> specimenFactory.build(SpecimenType.fromClass(type.getGenericTypeArgument(i)))));
    }

    @Override
    public T create(CustomizationContext customizationContext, Annotation[] annotations) {
        if (type.asClass().equals(Class.class)) {
            return (T) specimens.entrySet().stream().findFirst().get().getValue().create(customizationContext, new Annotation[0]).getClass();
        }

        if (context.isCached(type)) {
            return context.cached(type);
        }

        if (type.isInterface()) {
            return (T) context.cached(type, instanceFactory.proxy(type, specimens));
        }

        if (customizationContext.useRandomConstructor()) {
            return context.cached(type, instanceFactory.construct(type, customizationContext));
        }

        return populate(customizationContext);
    }

    private T populate(CustomizationContext customizationContext) {
        var result = context.cached(type, instanceFactory.instantiate(type));
        var reflector = new Reflector<>(result)
                .validateCustomization(customizationContext, type);
        try {
            reflector.getDeclaredFields()
                    .filter(field -> !customizationContext.getIgnoredFields().contains(field.getName()))
                    .forEach(field -> reflector.setField(field,
                            customizationContext.getCustomFields().getOrDefault(
                                    field.getName(),
                                    specimens.getOrDefault(
                                            field.getGenericType().getTypeName(),
                                            specimenFactory.build(SpecimenType.fromClass(field.getType()))).create(new CustomizationContext(List.of(), Map.of()), new Annotation[0]))));
        } catch (SpecimenException ex) {
            return context.overwrite(type, instanceFactory.construct(type, customizationContext));
        }
        return result;
    }
}