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An attempt to reimplement core features of a popular .NET anonymous value generator - AutoFixture - in Java
There is a newer version: 2.1.10
package autofixture.publicinterface;

import autofixture.interfaces.InlineConstrainedGenerator;
import autofixture.interfaces.InlineInstanceGenerator;
import com.google.common.reflect.TypeToken;

import java.net.InetAddress;
import java.net.URI;
import java.net.URL;
import java.time.*;
import java.time.chrono.ChronoLocalDate;
import java.time.chrono.ChronoLocalDateTime;
import java.util.*;
import java.util.stream.DoubleStream;
import java.util.stream.IntStream;
import java.util.stream.LongStream;

import static autofixture.publicinterface.InlineGenerators.*;

public class Generate {

  public static  T any(final InstanceOf instanceType) {
    return PrivateGenerate.FIXTURE.create(instanceType);
  }

  public static  T any(final Class clazz) {
    return PrivateGenerate.FIXTURE.create(clazz);
  }

  public static  T any(final InlineInstanceGenerator generator) {
    return PrivateGenerate.FIXTURE.create(generator);
  }

  public static  T any(final InstanceOf type, final InlineConstrainedGenerator generator) {
    return PrivateGenerate.FIXTURE.create(type, generator);
  }

  public static  T any(final Class instanceType, final InlineConstrainedGenerator generator) {
    return PrivateGenerate.any(TypeToken.of(instanceType), generator);
  }

  public static String anyString() {
    return any(String.class);
  }

  public static String anyStringOfLength(final int charactersCount) {
    return any(stringOfLength(charactersCount));
  }

  public static String anyStringNotContaining(final String... excludedSubstrings) {
    return any(stringNotContaining(excludedSubstrings));
  }
  public static String anyLowercaseString() {
    return any(lowercaseString());
  }

  public static String anyUppercaseString() {
    return any(uppercaseString());
  }

  public static String anyLowercaseString(final int length) {
    return any(lowercaseString(length));
  }

  public static String anyUppercaseString(final int length) {
    return any(uppercaseString(length));
  }


  public static String anyStringContaining(final String str) {
    return any(stringContaining(str));
  }

  public static Character anyAlphaChar() {
    return any(alphaChar());
  }

  public static Character anyDigitChar() {
    return any(digitChar());
  }

  public static String anyAlphaString() {
    return any(alphaString());
  }

  public static String anyAlphaString(final int length) {
    return any(alphaString(length));
  }

  public static String anyIdentifier() {
    return any(identifierString());
  }

  public static String anyLegalXmlTagName() {
    return anyIdentifier();
  }

  public static Integer anyInteger() {
    return PrivateGenerate.FIXTURE.create(int.class);
  }

  public static Short anyShort() {
    return PrivateGenerate.FIXTURE.create(short.class);
  }

  public static Double anyDouble() {
    return PrivateGenerate.FIXTURE.create(double.class);
  }

  public static Float anyFloat() {
    return PrivateGenerate.FIXTURE.create(float.class);
  }

  public static Character anyChar() {
    return PrivateGenerate.FIXTURE.create(char.class);
  }

  public static Long anyLong() {
    return PrivateGenerate.FIXTURE.create(long.class);
  }

  public static Long anyLongOtherThan(final long... other) {
    return any(new InstanceOf() {
    }, InlineGenerators.otherThan(boxed(other)));
  }

  public static String anyStringOtherThan(final String... other) {
    return any(new InstanceOf() {
    }, InlineGenerators.otherThan(other));
  }

  public static Integer anyIntegerOtherThan(final int... other) {
    return any(new InstanceOf() {
    }, InlineGenerators.otherThan(boxed(other)));
  }

  public static Short anyShortOtherThan(final short... other) {
    return any(new InstanceOf() {
    }, InlineGenerators.otherThan(boxed(other)));
  }

  public static Double anyDoubleOtherThan(final double... other) {
    return any(new InstanceOf() {
    }, InlineGenerators.otherThan(boxed(other)));
  }

  public static Float anyFloatOtherThan(final float... other) {
    return any(new InstanceOf() {
    }, InlineGenerators.otherThan(boxed(other)));
  }

  public static  T anyOf(final Class enumClass) {
    return any(enumClass);
  }

  public static Date anyDate() {
    return any(Date.class);
  }

  public static  T anyExploding(final Class clazz) {
    return PrivateGenerate.anyExploding(TypeToken.of(clazz));
  }

  public static  T anyExploding(final InstanceOf typeToken) {
    return PrivateGenerate.anyExploding(typeToken);
  }

  public static Exception anyException() {
    return any(RuntimeException.class);
  }

  public static Error anyError() {
    return PrivateGenerate.FIXTURE.create(Error.class);
  }

  public static Boolean anyBoolean() {
    return PrivateGenerate.FIXTURE.create(Boolean.class);
  }

  public static Object anyObject() {
    return PrivateGenerate.FIXTURE.create(Object.class);
  }

  public static URI anyUri() {
    return PrivateGenerate.FIXTURE.create(URI.class);
  }

  public static URL anyUrl() {
    return PrivateGenerate.FIXTURE.create(URL.class);
  }

  public static int anyPort() {
    return PrivateGenerate.FIXTURE.create(portNumber());
  }

  public static InetAddress anyIp() {
    return PrivateGenerate.FIXTURE.create(InetAddress.class);
  }

  public static ChronoLocalDate anyChronoLocalDate() {
    return PrivateGenerate.FIXTURE.create(ChronoLocalDate.class);
  }

  public static ChronoLocalDateTime anyChronoLocalDateTime() {
    return PrivateGenerate.FIXTURE.create(ChronoLocalDateTime.class);
  }

  public static LocalDateTime anyLocalDateTime() {
    return PrivateGenerate.FIXTURE.create(LocalDateTime.class);
  }

  public static LocalDate anyLocalDate() {
    return PrivateGenerate.FIXTURE.create(LocalDate.class);
  }

  public static ZonedDateTime anyZonedDateTime() {
    return PrivateGenerate.FIXTURE.create(ZonedDateTime.class);
  }

  public static ZoneId anyZoneId() {
    return PrivateGenerate.FIXTURE.create(ZoneId.class);
  }

  public static OffsetTime anyOffsetTime() {
    return PrivateGenerate.FIXTURE.create(OffsetTime.class);
  }

  public static Period anyPeriod() {
    return PrivateGenerate.FIXTURE.create(Period.class);
  }

  public static Duration anyDuration() {
    return PrivateGenerate.FIXTURE.create(Duration.class);
  }

  public static ZoneOffset anyZoneOffset() {
    return PrivateGenerate.FIXTURE.create(ZoneOffset.class);
  }

  public static Clock anyClock() {
    return PrivateGenerate.FIXTURE.create(Clock.class);
  }

  public static Instant anyInstant() {
    return PrivateGenerate.FIXTURE.create(Instant.class);
  }

  private static final HashMap INDICES_BY_CLASS = new HashMap<>();

  public static  T anyFrom(final T... possibleValues) {
    final Class key = possibleValues[0].getClass();
    if (!INDICES_BY_CLASS.containsKey(key)) {
      INDICES_BY_CLASS.put(key, new Random().nextInt(possibleValues.length));
    }

    Integer index = INDICES_BY_CLASS.get(key);

    if (index >= possibleValues.length) {
      index = 0;
    }

    final T returnedValue = possibleValues[index];

    index++;
    INDICES_BY_CLASS.put(key, index);

    return returnedValue;
  }

  // ITERABLES - complete


  public static  Iterable manyAsIterableOf(final InstanceOf type) {
    return PrivateGenerate.FIXTURE.createMany(type);
  }

  public static  Iterable manyAsIterableOf(final Class clazz) {
    return PrivateGenerate.FIXTURE.createMany(TypeToken.of(clazz));
  }

  public static  Iterable manyAsIterableOf(
      final InstanceOf typeToken, final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsIterableOf(typeToken, omittedValues);
  }


  public static  Iterable manyAsIterableOf(final Class type, final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsIterableOf(TypeToken.of(type), omittedValues);
  }

  //ARRAYS - complete
  public static  T[] manyAsArrayOf(final Class clazz) {
    return PrivateGenerate.manyAsArrayOf(TypeToken.of(clazz));
  }

  public static  T[] manyAsArrayOf(final InstanceOf type) {
    return PrivateGenerate.manyAsArrayOf(type);
  }

  public static  T[] manyAsArrayOf(final InstanceOf typeToken,
                                       final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsArrayOf(typeToken, omittedValues);
  }

  public static  T[] manyAsArrayOf(final Class type,
                                      final InlineConstrainedGenerator omittedValues) {
    T[] array = PrivateGenerate.manyAsArrayOf(TypeToken.of(type), omittedValues);
    return array;
  }

  //LISTS - complete
  public static  List manyAsListOf(final Class clazz) {
    return PrivateGenerate.manyAsListOf(TypeToken.of(clazz));
  }

  public static  List manyAsListOf(final InstanceOf type) {
    return PrivateGenerate.manyAsListOf(type);
  }

  public static  List manyAsListOf(final InstanceOf typeToken, final InlineConstrainedGenerator generator) {
    return PrivateGenerate.manyAsListOf(typeToken, generator);
  }

  public static  List manyAsListOf(final Class type, final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsListOf(TypeToken.of(type), omittedValues);
  }

  // COLLECTIONS - complete

  public static  Collection manyAsCollectionOf(final InstanceOf typeToken, final InlineConstrainedGenerator omittedValues) {
    return manyAsListOf(typeToken, omittedValues);
  }

  public static  Collection manyAsCollectionOf(final Class type, final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsListOf(TypeToken.of(type), omittedValues);
  }

  public static  Collection manyAsCollectionOf(final Class clazz) {
    return PrivateGenerate.FIXTURE.createMany(TypeToken.of(clazz));
  }

  public static  Collection manyAsCollectionOf(final InstanceOf instanceType) {
    return PrivateGenerate.FIXTURE.createMany(instanceType);
  }

  //SETS: complete
  public static  Set manyAsSetOf(final Class clazz) {
    return PrivateGenerate.manyAsSetOf(TypeToken.of(clazz));
  }

  public static  Set manyAsSetOf(final InstanceOf type) {
    return PrivateGenerate.manyAsSetOf(type);
  }

  public static  Set manyAsSetOf(final Class type, final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsSetOf(TypeToken.of(type), omittedValues);
  }

  public static  Set manyAsSetOf(final InstanceOf type, final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsSetOf(type, omittedValues);
  }

  //queues: complete
  public static  Queue manyAsQueueOf(final Class clazz) {
    return PrivateGenerate.manyAsQueueOf(TypeToken.of(clazz));
  }


  public static  Queue manyAsQueueOf(final InstanceOf type) {
    return PrivateGenerate.manyAsQueueOf(type);
  }

  public static  Queue manyAsQueueOf(final Class type, final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsQueueOf(TypeToken.of(type), omittedValues);
  }

  public static  Queue manyAsQueueOf(final InstanceOf type, final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsQueueOf(type, omittedValues);
  }

  //Deques: complete
  public static  Deque manyAsDequeOf(final Class clazz) {
    return PrivateGenerate.manyAsDequeOf(TypeToken.of(clazz));
  }

  public static  Deque manyAsDequeOf(final InstanceOf type) {
    return PrivateGenerate.manyAsDequeOf(type);
  }

  public static  Deque manyAsDequeOf(final Class type, final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsDequeOf(TypeToken.of(type), omittedValues);
  }

  public static  Deque manyAsDequeOf(final InstanceOf type, final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsDequeOf(type, omittedValues);
  }

  //sorted sets: complete
  public static  SortedSet manyAsSortedSetOf(final Class clazz) {
    return PrivateGenerate.manyAsSortedSetOf(TypeToken.of(clazz));
  }


  public static  SortedSet manyAsSortedSetOf(final InstanceOf type) {
    return PrivateGenerate.manyAsSortedSetOf(type);
  }

  public static  SortedSet manyAsSortedSetOf(final Class type, final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsSortedSetOf(TypeToken.of(type), omittedValues);
  }

  public static  SortedSet manyAsSortedSetOf(final InstanceOf type, final InlineConstrainedGenerator omittedValues) {
    return PrivateGenerate.manyAsSortedSetOf(type, omittedValues);
  }

  //sorted maps

  //TODO variations and UT
  public static  SortedMap manyAsSortedMapBetween(final Class key, final Class value) {
    return PrivateGenerate.manyAsSortedMapBetween(TypeToken.of(key), TypeToken.of(value));
  }

  public static  SortedMap manyAsSortedMapBetween(final InstanceOf key, final InstanceOf value) {
    return PrivateGenerate.manyAsSortedMapBetween(key, value);
  }

  //maps

  //TODO variations
  public static  Map manyAsMapBetween(final Class keyClass, final Class valueClass) {
    return PrivateGenerate.manyAsMapBetween(TypeToken.of(keyClass), TypeToken.of(valueClass));
  }

  public static  Map manyAsMapBetween(final InstanceOf keyType, final InstanceOf valueType) {
    return PrivateGenerate.manyAsMapBetween(keyType, valueType);
  }

  private static Long[] boxed(final long[] other) {
    return LongStream.of(other).boxed().toArray(Long[]::new);
  }

  private static Float[] boxed(final float[] other) {
    final ArrayList list = new ArrayList<>();
    for (final float f : other) {
      list.add(f);
    }
    return list.toArray(new Float[]{});
  }

  private static Short[] boxed(final short[] other) {
    final ArrayList list = new ArrayList<>();
    for (final short s : other) {
      list.add(s);
    }
    return list.toArray(new Short[]{});
  }

  private static Double[] boxed(final double[] other) {
    return DoubleStream.of(other).boxed().toArray(Double[]::new);
  }

  private static Integer[] boxed(final int... other) {
    return IntStream.of(other).boxed().toArray(Integer[]::new);
  }

  public static  T dummy(InstanceOf instanceType) {
    return PrivateGenerate.FIXTURE.createDummy(instanceType);
  }

  public static  T dummy(Class clazz) {
    return PrivateGenerate.FIXTURE.createDummy(clazz);
  }

  public static RuntimeException anyRuntimeException() {
    return PrivateGenerate.FIXTURE.create(RuntimeException.class);
  }

  public static Exception anyCheckedException() {
    return PrivateGenerate.FIXTURE.create(Exception.class);
  }

  public static Throwable anyThrowable() {
    return PrivateGenerate.FIXTURE.create(Throwable.class);
  }

  public static String anyString(String seed) {
    return seed + anyString();
  }
}