Module org.junit.jupiter.api

Package org.junit.jupiter.api.extension

Interface ExtensionContext.Store

All Known Implementing Classes:

NamespaceAwareStore

Enclosing interface:

ExtensionContext

public static interface ExtensionContext.Store

Store provides methods for extensions to save and retrieve data.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	ExtensionContext.Store.CloseableResource	Classes implementing this interface indicate that they want to ExtensionContext.Store.CloseableResource.close() some underlying resource or resources when the enclosing Store is closed.

Method Summary

Modifier and Type	Method	Description
Object	get(Object key)	Get the value that is stored under the supplied key.
<V> V	get(Object key, Class<V> requiredType)	Get the value of the specified required type that is stored under the supplied key.
default <V> V	getOrComputeIfAbsent(Class<V> type)	Get the object of type type that is present in this Store (keyed by type); and otherwise invoke the default constructor for type to generate the object, store it, and return it.
<K, V> Object	getOrComputeIfAbsent(K key, Function<K,V> defaultCreator)	Get the value that is stored under the supplied key.
<K, V> V	getOrComputeIfAbsent(K key, Function<K,V> defaultCreator, Class<V> requiredType)	Get the value of the specified required type that is stored under the supplied key.
default <V> V	getOrDefault(Object key, Class<V> requiredType, V defaultValue)	Get the value of the specified required type that is stored under the supplied key, or the supplied defaultValue if no value is found for the supplied key in this store or in an ancestor.
void	put(Object key, Object value)	Store a value for later retrieval under the supplied key.
Object	remove(Object key)	Remove the value that was previously stored under the supplied key.
<V> V	remove(Object key, Class<V> requiredType)	Remove the value of the specified required type that was previously stored under the supplied key.

Method Details

get

Object get(Object key)

Get the value that is stored under the supplied key.

If no value is stored in the current ExtensionContext for the supplied key, ancestors of the context will be queried for a value with the same key in the Namespace used to create this store.

For greater type safety, consider using get(Object, Class) instead.

Parameters:

key - the key; never null

Returns:

the value; potentially null

See Also:

• get(Object, Class)
• getOrDefault(Object, Class, Object)

get

<V> V get(Object key,
 Class<V> requiredType)

Get the value of the specified required type that is stored under the supplied key.

If no value is stored in the current ExtensionContext for the supplied key, ancestors of the context will be queried for a value with the same key in the Namespace used to create this store.

Type Parameters:

V - the value type

Parameters:

key - the key; never null

requiredType - the required type of the value; never null

Returns:

the value; potentially null

See Also:

• get(Object)
• getOrDefault(Object, Class, Object)

getOrDefault

@API(status=STABLE,
     since="5.5")
default <V> V getOrDefault(Object key,
 Class<V> requiredType,
 V defaultValue)

Get the value of the specified required type that is stored under the supplied key, or the supplied defaultValue if no value is found for the supplied key in this store or in an ancestor.

If no value is stored in the current ExtensionContext for the supplied key, ancestors of the context will be queried for a value with the same key in the Namespace used to create this store.

Type Parameters:

V - the value type

Parameters:

key - the key; never null

requiredType - the required type of the value; never null

defaultValue - the default value

Returns:

the value; potentially null

Since:

5.5

See Also:

• get(Object, Class)

getOrComputeIfAbsent

@API(status=STABLE,
     since="5.1")
default <V> V getOrComputeIfAbsent(Class<V> type)

Get the object of type type that is present in this Store (keyed by type); and otherwise invoke the default constructor for type to generate the object, store it, and return it.

This method is a shortcut for the following, where X is the type of object we wish to retrieve from the store.

 X x = store.getOrComputeIfAbsent(X.class, key -> new X(), X.class);
 // Equivalent to:
 // X x = store.getOrComputeIfAbsent(X.class);
 

See getOrComputeIfAbsent(Object, Function, Class) for further details.

If type implements ExtensionContext.Store.CloseableResource the close() method will be invoked on the stored object when the store is closed.

Type Parameters:

V - the key and value type

Parameters:

type - the type of object to retrieve; never null

Returns:

the object; never null

Since:

5.1

See Also:

• getOrComputeIfAbsent(Object, Function)
• getOrComputeIfAbsent(Object, Function, Class)
• ExtensionContext.Store.CloseableResource

getOrComputeIfAbsent

<K,
V> Object getOrComputeIfAbsent(K key,
 Function<K,V> defaultCreator)

Get the value that is stored under the supplied key.

If no value is stored in the current ExtensionContext for the supplied key, ancestors of the context will be queried for a value with the same key in the Namespace used to create this store. If no value is found for the supplied key, a new value will be computed by the defaultCreator (given the key as input), stored, and returned.

For greater type safety, consider using getOrComputeIfAbsent(Object, Function, Class) instead.

If the created value is an instance of ExtensionContext.Store.CloseableResource the close() method will be invoked on the stored object when the store is closed.

Type Parameters:

K - the key type

V - the value type

Parameters:

key - the key; never null

defaultCreator - the function called with the supplied key to create a new value; never null but may return null

Returns:

the value; potentially null

See Also:

• getOrComputeIfAbsent(Class)
• getOrComputeIfAbsent(Object, Function, Class)
• ExtensionContext.Store.CloseableResource

getOrComputeIfAbsent

<K,
V> V getOrComputeIfAbsent(K key,
 Function<K,V> defaultCreator,
 Class<V> requiredType)

Get the value of the specified required type that is stored under the supplied key.

If no value is stored in the current ExtensionContext for the supplied key, ancestors of the context will be queried for a value with the same key in the Namespace used to create this store. If no value is found for the supplied key, a new value will be computed by the defaultCreator (given the key as input), stored, and returned.

If requiredType implements ExtensionContext.Store.CloseableResource the close() method will be invoked on the stored object when the store is closed.

Type Parameters:

K - the key type

V - the value type

Parameters:

key - the key; never null

defaultCreator - the function called with the supplied key to create a new value; never null but may return null

requiredType - the required type of the value; never null

Returns:

the value; potentially null

See Also:

• getOrComputeIfAbsent(Class)
• getOrComputeIfAbsent(Object, Function)
• ExtensionContext.Store.CloseableResource

put

void put(Object key,
 Object value)

Store a value for later retrieval under the supplied key.

A stored value is visible in child ExtensionContexts for the store's Namespace unless they overwrite it.

If the value is an instance of ExtensionContext.Store.CloseableResource the close() method will be invoked on the stored object when the store is closed.

Parameters:

key - the key under which the value should be stored; never null

value - the value to store; may be null

See Also:

• ExtensionContext.Store.CloseableResource

remove

Object remove(Object key)

Remove the value that was previously stored under the supplied key.

The value will only be removed in the current ExtensionContext, not in ancestors. In addition, the ExtensionContext.Store.CloseableResource API will not be honored for values that are manually removed via this method.

For greater type safety, consider using remove(Object, Class) instead.

Parameters:

key - the key; never null

Returns:

the previous value or null if no value was present for the specified key

See Also:

• remove(Object, Class)

remove

<V> V remove(Object key,
 Class<V> requiredType)

Remove the value of the specified required type that was previously stored under the supplied key.

The value will only be removed in the current ExtensionContext, not in ancestors. In addition, the ExtensionContext.Store.CloseableResource API will not be honored for values that are manually removed via this method.

Type Parameters:

V - the value type

Parameters:

key - the key; never null

requiredType - the required type of the value; never null

Returns:

the previous value or null if no value was present for the specified key

See Also:

• remove(Object)