# AttributeContainer

interface AttributeContainer : HasAttributes

An attribute container is a container of attributes, which are strongly typed named entities. Such a container is responsible for storing and getting attributes in a type safe way. In particular, attributes are strongly typed, meaning that when we get a value from the container, the returned value type is inferred from the type of the attribute. In a way, an attribute container is similar to a java.util.Map where the entry is a "typed String" and the value is of the string type. However, the set of methods available to the container is much more limited. It is not allowed to have two attributes with the same name but different types in the container.

#### Since

3.3

## Functions

attribute
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abstract fun <T> attribute(key: Attribute<T>, value: T): AttributeContainer
Sets an attribute value.
attributeProvider
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abstract fun <T> attributeProvider(key: Attribute<T>, provider: Provider<out T>): AttributeContainer
Sets an attribute to have the same value as the given provider.
contains
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abstract fun contains(key: Attribute<out Any>): Boolean
Tells if a specific attribute is found in this container.
getAttribute
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@Nullable
abstract fun <T> getAttribute(key: Attribute<T>): T
Returns the value of an attribute found in this container with the type specified by the given `key`, or `null` if this container doesn't have it.
getAttributes
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abstract fun getAttributes(): AttributeContainer
isEmpty
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abstract fun isEmpty(): Boolean
Returns true if this container is empty.
keySet
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abstract fun keySet(): Set<Attribute<out Any>>
Returns the set of attribute keys of this container.