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The easiest way to generate controllable arbitrary test objects
There is a newer version: 1.1.3
/*
 * Fixture Monkey
 *
 * Copyright (c) 2021-present NAVER Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.navercorp.fixturemonkey;

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

import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Stream;

import org.apiguardian.api.API;
import org.apiguardian.api.API.Status;

import net.jqwik.api.Arbitrary;

import com.navercorp.fixturemonkey.api.context.MonkeyContext;
import com.navercorp.fixturemonkey.api.matcher.MatcherOperator;
import com.navercorp.fixturemonkey.api.option.FixtureMonkeyOptions;
import com.navercorp.fixturemonkey.api.property.RootProperty;
import com.navercorp.fixturemonkey.api.type.LazyAnnotatedType;
import com.navercorp.fixturemonkey.api.type.TypeReference;
import com.navercorp.fixturemonkey.builder.ArbitraryBuilderContext;
import com.navercorp.fixturemonkey.builder.DefaultArbitraryBuilder;
import com.navercorp.fixturemonkey.builder.JavaTypeDefaultTypeArbitraryBuilder;
import com.navercorp.fixturemonkey.customizer.ArbitraryManipulator;
import com.navercorp.fixturemonkey.customizer.MonkeyManipulatorFactory;
import com.navercorp.fixturemonkey.experimental.ExperimentalArbitraryBuilder;
import com.navercorp.fixturemonkey.resolver.ArbitraryResolver;
import com.navercorp.fixturemonkey.resolver.ManipulatorOptimizer;

@API(since = "0.4.0", status = Status.MAINTAINED)
public final class FixtureMonkey {
	private final FixtureMonkeyOptions fixtureMonkeyOptions;
	private final ManipulatorOptimizer manipulatorOptimizer;
	private final MonkeyContext monkeyContext;
	private final List>> registeredArbitraryBuilders = new ArrayList<>();
	private final MonkeyManipulatorFactory monkeyManipulatorFactory;

	public FixtureMonkey(
		FixtureMonkeyOptions fixtureMonkeyOptions,
		ManipulatorOptimizer manipulatorOptimizer,
		MonkeyContext monkeyContext,
		List>>> registeredArbitraryBuilders,
		MonkeyManipulatorFactory monkeyManipulatorFactory
	) {
		this.fixtureMonkeyOptions = fixtureMonkeyOptions;
		this.manipulatorOptimizer = manipulatorOptimizer;
		this.monkeyContext = monkeyContext;
		this.monkeyManipulatorFactory = monkeyManipulatorFactory;
		initializeRegisteredArbitraryBuilders(registeredArbitraryBuilders);
	}

	public static FixtureMonkeyBuilder builder() {
		return new FixtureMonkeyBuilder();
	}

	public static FixtureMonkey create() {
		return builder().build();
	}

	public  ArbitraryBuilder giveMeBuilder(Class type) {
		TypeReference typeReference = new TypeReference(type) {
		};
		return giveMeBuilder(typeReference);
	}

	public  ArbitraryBuilder giveMeBuilder(TypeReference type) {
		RootProperty rootProperty = new RootProperty(type.getAnnotatedType());

		ArbitraryBuilderContext builderContext = registeredArbitraryBuilders.stream()
			.filter(it -> it.match(rootProperty))
			.map(MatcherOperator::getOperator)
			.findAny()
			.map(DefaultArbitraryBuilder.class::cast)
			.map(DefaultArbitraryBuilder::getContext)
			.orElse(new ArbitraryBuilderContext());

		return new DefaultArbitraryBuilder<>(
			fixtureMonkeyOptions,
			rootProperty,
			new ArbitraryResolver(
				manipulatorOptimizer,
				monkeyManipulatorFactory,
				fixtureMonkeyOptions,
				monkeyContext,
				registeredArbitraryBuilders
			),
			monkeyManipulatorFactory,
			builderContext.copy(),
			registeredArbitraryBuilders,
			monkeyContext,
			fixtureMonkeyOptions.getInstantiatorProcessor()
		);
	}

	public  ArbitraryBuilder giveMeBuilder(T value) {
		ArbitraryBuilderContext context = new ArbitraryBuilderContext();

		ArbitraryManipulator arbitraryManipulator =
			monkeyManipulatorFactory.newArbitraryManipulator("$", value);
		context.addManipulator(arbitraryManipulator);

		return new DefaultArbitraryBuilder<>(
			fixtureMonkeyOptions,
			new RootProperty(new LazyAnnotatedType<>(() -> value)),
			new ArbitraryResolver(
				manipulatorOptimizer,
				monkeyManipulatorFactory,
				fixtureMonkeyOptions,
				monkeyContext,
				registeredArbitraryBuilders
			),
			monkeyManipulatorFactory,
			context,
			registeredArbitraryBuilders,
			monkeyContext,
			fixtureMonkeyOptions.getInstantiatorProcessor()
		);
	}

	public  ExperimentalArbitraryBuilder giveMeExperimentalBuilder(Class type) {
		return (ExperimentalArbitraryBuilder)giveMeBuilder(type);
	}

	public  ExperimentalArbitraryBuilder giveMeExperimentalBuilder(TypeReference type) {
		return (ExperimentalArbitraryBuilder)giveMeBuilder(type);
	}

	public  JavaTypeArbitraryBuilder giveMeJavaBuilder(Class type) {
		return new JavaTypeDefaultTypeArbitraryBuilder<>(this.giveMeBuilder(type));
	}

	public  JavaTypeArbitraryBuilder giveMeJavaBuilder(TypeReference type) {
		return new JavaTypeDefaultTypeArbitraryBuilder<>(this.giveMeBuilder(type));
	}

	public  Stream giveMe(Class type) {
		return Stream.generate(() -> this.giveMeBuilder(type).sample());
	}

	public  Stream giveMe(TypeReference typeReference) {
		return Stream.generate(() -> this.giveMeBuilder(typeReference).sample());
	}

	public  List giveMe(Class type, int size) {
		return this.giveMe(type).limit(size).collect(toList());
	}

	public  List giveMe(TypeReference typeReference, int size) {
		return this.giveMe(typeReference).limit(size).collect(toList());
	}

	public  T giveMeOne(Class type) {
		return this.giveMe(type, 1).get(0);
	}

	public  T giveMeOne(TypeReference typeReference) {
		return this.giveMe(typeReference, 1).get(0);
	}

	public  Arbitrary giveMeArbitrary(Class type) {
		return this.giveMeBuilder(type).build();
	}

	public  Arbitrary giveMeArbitrary(TypeReference typeReference) {
		return this.giveMeBuilder(typeReference).build();
	}

	private void initializeRegisteredArbitraryBuilders(
		List>>> registeredArbitraryBuilders
	) {
		List>> generatedRegisteredArbitraryBuilder =
			registeredArbitraryBuilders.stream()
				.map(it -> new MatcherOperator<>(it.getMatcher(), it.getOperator().apply(this)))
				.collect(toList());

		for (int i = generatedRegisteredArbitraryBuilder.size() - 1; i >= 0; i--) {
			this.registeredArbitraryBuilders.add(generatedRegisteredArbitraryBuilder.get(i));
		}
	}
}