Type Parameters:

T - type being created

All Known Subinterfaces:

InstancioOfClassApi<T>

All Known Implementing Classes:

ClassInstancioApiImpl, InstancioApiImpl
```
public interface InstancioApi<T>
```
Instancio API for generating instances of a class populated with random data.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`T`	`create()`	Creates a new instance of a class and populates it with data.
`<V,S extends GeneratorSpec<V>> InstancioApi<T>`	`generate(SelectorGroup selectors, Function<Generators,S> gen)`	Generates a random value for a field or class using a built-in generator.
`InstancioApi<T>`	`ignore(SelectorGroup selectors)`	Specifies that a class or field should be ignored.
`InstancioApi<T>`	`map(SelectorGroup selectors, Class<?> subtype)`	Maps target field or class to the given subtype.
`<V> InstancioApi<T>`	`onComplete(SelectorGroup selectors, OnCompleteCallback<V> callback)`	A callback that gets invoked after an object has been fully populated.
`Stream<T>`	`stream()`	Creates an infinite stream of distinct, fully populated objects.
`<V> InstancioApi<T>`	`supply(SelectorGroup selectors, Supplier<V> supplier)`	Supplies a non-random value for a field or class using a `Supplier`.
`<V> InstancioApi<T>`	`supply(SelectorGroup selectors, Generator<V> generator)`	Supplies a randomised value for a field or class using a custom `Generator`.
`Model<T>`	`toModel()`	Creates a model containing all the information for populating a class.
`InstancioApi<T>`	`withNullable(SelectorGroup selectors)`	Specifies that a field or class is nullable.
`InstancioApi<T>`	`withSeed(int seed)`	Set the seed value for the random number generator.
`InstancioApi<T>`	`withSettings(Settings settings)`	Override default settings for generated values.

- Method Detail
  - create
```
T create()
```
    Creates a new instance of a class and populates it with data.
    Example:
    Person person = Instancio.of(Person.class).create();
    
    The returned object will have all its fields populated with random data, including collection and array fields.
    Returns:
    
    a fully populated object
  - stream
```
Stream<T> stream()
```
    Creates an infinite stream of distinct, fully populated objects.
    Example:
    List<Person> persons = Instancio.of(Person.class) .stream() .limit(5) .collect(Collectors.toList());
    Returns:
    
    an infinite stream of distinct, populated objects
  - toModel
```
Model<T> toModel()
```
    Creates a model containing all the information for populating a class.
    The model can be useful when class population needs to be customised and the customisations need to be re-used in different parts of the code.
    Example:
    Model<Person> personModel = Instancio.of(Person.class) .supply(field("fullName"), () -> "Jane Doe") .toModel(); // Re-use the model to create instances of Person class // without duplicating the model's details Person person = Instancio.of(personModel).create();
    
    Since the internal data of the model is not part of the public API, the Model interface does not contain any methods.
    Returns:
    
    a model containing all the details
  - ignore
```
InstancioApi<T> ignore(SelectorGroup selectors)
```
    Specifies that a class or field should be ignored.
    Example:
    Person person = Instancio.of(Person.class) .ignore(field("pets")) // Person.pets field .ignore(field(Address.class, "phoneNumbers")) // Address.phoneNumbers field .ignore(allStrings()) .create();
    
    will create a fully populated person, but will ignore the address field and all string fields.
    Parameters:
    
    selectors - for fields and/or classes this method should be applied to
    
    Returns:
    
    API builder reference
  - withNullable
```
InstancioApi<T> withNullable(SelectorGroup selectors)
```
    Specifies that a field or class is nullable. By default, Instancio assigns non-null values. If marked as nullable, Instancio will randomly assign either a null or non-null value to fields of this type.
    Example:
    Person person = Instancio.of(Person.class) .withNullable(allStrings()) .withNullable(field(Address.class)) .create();
    Parameters:
    
    selectors - for fields and/or classes this method should be applied to
    
    Returns:
    
    API builder reference
  - supply
```
<V> InstancioApi<T> supply(SelectorGroup selectors,
                           Supplier<V> supplier)
```
    Supplies a non-random value for a field or class using a Supplier.
    Example:
    Person person = Instancio.of(Person.class) .supply(all(LocalDateTime.class), () -> LocalDateTime.now()) // set all dates to current time .supply(field("fullName"), () -> "Homer Simpson") // set Person.fullName .supply(field(Address.class, "phoneNumbers"), () -> List.of( // set Address.phoneNumbers new PhoneNumber("+1", "123-45-67"), new PhoneNumber("+1", "345-67-89"))) .create();
    
    Note: Instancio will not modify the supplied instance in any way. If the PhoneNumber class has other fields, they will be ignored.
    For supplying random values, see supply(SelectorGroup, Generator).
    Type Parameters:
    
    V - type of the value to generate
    
    Parameters:
    
    selectors - for fields and/or classes this method should be applied to
    
    supplier - providing the value for given selectors
    
    Returns:
    
    API builder reference
    
    See Also:
    
    supply(SelectorGroup, Generator)
  - supply
```
<V> InstancioApi<T> supply(SelectorGroup selectors,
                           Generator<V> generator)
```
    Supplies a randomised value for a field or class using a custom Generator.
    Example:
    Person person = Instancio.of(Person.class) .supply(field(Address.class, "phoneNumbers"), random -> List.of( // Generate phone numbers with a random country code, either US or Mexico new PhoneNumber(random.from("+1", "+52"), "123-55-66"), new PhoneNumber(random.from("+1", "+52"), "123-77-88"))) .create();
    
    Note: Instancio will not modify the supplied instance in any way. If the PhoneNumber class has other fields, they will be ignored.
    Type Parameters:
    
    V - type of the value to generate
    
    Parameters:
    
    selectors - for fields and/or classes this method should be applied to
    
    generator - that will provide the values
    
    Returns:
    
    API builder reference
  - generate
```
<V,S extends GeneratorSpec<V>> InstancioApi<T> generate(SelectorGroup selectors,
                                                              Function<Generators,S> gen)
```
    Generates a random value for a field or class using a built-in generator.
    Example:
    Person person = Instancio.of(Person.class) .generate(field("age"), gen -> gen.ints().min(18).max(100)) .generate(field("name"), gen -> gen.string().min(5).allowEmpty()) .generate(field(Address.class, "phoneNumbers"), gen -> gen.collection().minSize(5)) .generate(field(Address.class, "city"), gen -> gen.oneOf("Burnaby", "Vancouver", "Richmond")) .create();
    Type Parameters:
    
    V - type of the value to generate
    
    S - generator spec type
    
    Parameters:
    
    selectors - for fields and/or classes this method should be applied to
    
    gen - provider of built-in generators
    
    Returns:
    
    API builder reference
  - onComplete
```
<V> InstancioApi<T> onComplete(SelectorGroup selectors,
                               OnCompleteCallback<V> callback)
```
    A callback that gets invoked after an object has been fully populated.
    Example:
    // Sets countryCode field on all instances of Phone to the specified value Person person = Instancio.of(Person.class) .onComplete(all(Phone.class), (Phone phone) -> phone.setCountryCode("+1")) .create();
    Type Parameters:
    
    V - type of object handled by the callback
    
    Parameters:
    
    selectors - for fields and/or classes this method should be applied to
    
    callback - to invoke after object has been populated
    
    Returns:
    
    API builder reference
  - map
```
InstancioApi<T> map(SelectorGroup selectors,
                    Class<?> subtype)
```
    Maps target field or class to the given subtype. This can be used in the following cases:
    
    to specify an implementation for interfaces or abstract classes
    
    to override default implementations used by Instancio
    
    Specify an implementation for an abstract type
    When Instancio encounters an interface or an abstract type it is not aware of (for example, that is not part of the JDK), it will not be able to instantiate it. This method can be used to specify an implementation to use in such cases. For example:
    WidgetContainer container = Instancio.of(WidgetContainer.class) .map(all(AbstractWidget.class), ConcreteWidget.class) .create();
    
    Override default implementations
    By default, Instancio uses certain defaults for collection classes, for example ArrayList for List. If an alternative implementation is required, this method allows to specify it:
    Person person = Instancio.of(Person.class) .map(all(List.class), LinkedList.class) .create();
    
    will use the LinkedList implementation for all Lists.
    Parameters:
    
    selectors - for fields and/or classes this method should be applied to
    
    subtype - to map the selectors to
    
    Returns:
    
    API builder reference
  - withSettings
```
InstancioApi<T> withSettings(Settings settings)
```
    Override default settings for generated values. Settings include collection sizes, string lengths, numeric ranges, etc.
    
    Parameters:
    
    settings - to use
    
    Returns:
    
    API builder reference
  - withSeed
```
InstancioApi<T> withSeed(int seed)
```
    Set the seed value for the random number generator. If seed is not specified, a random seed will be used. Specifying a seed is useful for reproducing test results. By specifying the seed value, the same random data will be generated again.
    Example:
    // Generates a different UUID each time UUID result = Instancio.of(UUID.class).create(); // Generates the same UUID UUID result = Instancio.of(UUID.class) .withSeed(1234) .create();
    Parameters:
    
    seed - for the random number generator
    
    Returns:
    
    API builder reference

Interface InstancioApi<T>

Method Summary

Method Detail

create

stream

toModel

ignore

withNullable

supply

supply

generate

onComplete

map

withSettings

withSeed