Package org.gradle.api.provider

## Interface HasMultipleValues<T>

- Type Parameters:
    `T` - the type of elements.
  All Known Subinterfaces:
    `ListProperty<T>`, `SetProperty<T>`

      @Incubating
      public interface HasMultipleValues<T>

  Represents a property whose value can be set using multiple elements of type `HasMultipleValues`, such as a collection property.

  Note: This interface is not intended for implementation by build script or plugin authors. You can use the factory methods on `ObjectFactory` to create various subtypes of this interface.

  Since:
    4.5

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `add​(Provider<? extends T> provider)` | Adds an element to the property value.
    `void` | `add​(T element)` | Adds an element to the property value.
    `void` | `addAll​(Iterable<? extends T> elements)` | Adds zero or more elements to the property value.
    `void` | `addAll​(Provider<? extends Iterable<? extends T>> provider)` | Adds zero or more elements to the property value.
    `void` | `addAll​(T... elements)` | Adds zero or more elements to the property value.
    `HasMultipleValues<T>` | `convention​(Iterable<? extends T> elements)` | Specifies the value to use as the convention for this property.
    `HasMultipleValues<T>` | `convention​(Provider<? extends Iterable<? extends T>> provider)` | Specifies the provider of the value to use as the convention for this property.
    `HasMultipleValues<T>` | `empty()` | Sets the value of this property to an empty collection, and replaces any existing value.
    `void` | `finalizeValue()` | Disallows further changes to the value of this property.
    `void` | `set​(Iterable<? extends T> elements)` | Sets the value of the property to the elements of the given iterable, and replaces any existing value.
    `void` | `set​(Provider<? extends Iterable<? extends T>> provider)` | Sets the property to have the same value of the given provider, and replaces any existing value.

- - ### Method Detail

    - #### set

          void set​(@Nullable
                   Iterable<? extends T> elements)

      Sets the value of the property to the elements of the given iterable, and replaces any existing value. This property will query the elements of the iterable each time the value of this property is queried.

      This method can also be used to clear the value of the property, by passing `null` as the value.

      Parameters:
        `elements` - The elements, can be null.

    - #### set

          void set​(Provider<? extends Iterable<? extends T>> provider)

      Sets the property to have the same value of the given provider, and replaces any existing value. This property will track the value of the provider and query its value each time the value of this property is queried. When the provider has no value, this property will also have no value.
      Parameters:
        `provider` - Provider of the elements.

    - #### empty

          HasMultipleValues<T> empty()

      Sets the value of this property to an empty collection, and replaces any existing value.
      Returns:
        this property.
      Since:
        5.0

    - #### add

          void add​(T element)

      Adds an element to the property value.
      Parameters:
        `element` - The element

    - #### add

          void add​(Provider<? extends T> provider)

      Adds an element to the property value.

      The given provider will be queried when the value of this property is queried. This property will have no value when the given provider has no value.

      Parameters:
        `provider` - The provider of an element

    - #### addAll

          void addAll​(T... elements)

      Adds zero or more elements to the property value.
      Parameters:
        `elements` - The elements to add
      Since:
        4.10

    - #### addAll

          void addAll​(Iterable<? extends T> elements)

      Adds zero or more elements to the property value.

      The given iterable will be queried when the value of this property is queried.

      Parameters:
        `elements` - The elements to add.
      Since:
        4.10

    - #### addAll

          void addAll​(Provider<? extends Iterable<? extends T>> provider)

      Adds zero or more elements to the property value.

      The given provider will be queried when the value of this property is queried. This property will have no value when the given provider has no value.

      Parameters:
        `provider` - Provider of elements

    - #### convention

          HasMultipleValues<T> convention​(Iterable<? extends T> elements)

      Specifies the value to use as the convention for this property. The convention is used when no value has been set for this property.
      Parameters:
        `elements` - The elements
      Returns:
        this
      Since:
        5.1

    - #### convention

          HasMultipleValues<T> convention​(Provider<? extends Iterable<? extends T>> provider)

      Specifies the provider of the value to use as the convention for this property. The convention is used when no value has been set for this property.
      Parameters:
        `provider` - The provider of the elements
      Returns:
        this
      Since:
        5.1

    - #### finalizeValue

          void finalizeValue()

      Disallows further changes to the value of this property. Calls to methods that change the value of this property, such as `set(Iterable)` or `add(Object)` will fail.

      When this property has elements provided by a `Provider`, the value of the provider is queried when this method is called and the value of the provider will no longer be tracked.

      Note that although the value of the property will not change, the resulting collection may contain mutable objects. Calling this method does not guarantee that the value will become immutable.

      Since:
        5.0