Package it.tidalwave.util

Interface As

All Known Subinterfaces:

PresentationModel, UserAction

All Known Implementing Classes:

AsSupport, CollaborationCompletedMessage, CollaborationStartedMessage, MessageSupport

public interface As

Objects implementing this interface can provide am adapter of the required type. The adapter can be found with a variety of approaches that depend on the implementation. This capability can be used to implement a design based on the Data, Context and Interaction pattern (DCI).

Author:

Fabrizio Giudici

Status: stable API

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	As.Defaults
static interface	As.NotFoundBehaviour<T>

Method Summary

Modifier and Type	Method	Description
<T> T	as(java.lang.Class<T> type)	Returns an adapter to this object of the specified type.
<T> T	as(java.lang.Class<T> type, As.NotFoundBehaviour<T> notFoundBehaviour)	Returns an adapter to this object of the specified type.
<T> java.util.Collection<T>	asMany(java.lang.Class<T> type)	Searches for multiple adapters of the given type and returns them.
default <T> java.util.Optional<T>	asOptional(java.lang.Class<T> type)	Deprecated. Use maybeAs(Class).
default <T> java.util.Optional<T>	maybeAs(java.lang.Class<T> type)	Returns the requested role or an empty Optional.

Method Detail

as

@Nonnull
<T> T as(@Nonnull
         java.lang.Class<T> type)

Returns an adapter to this object of the specified type. If the implementation can find multiple compliant adapters, only one will be returned.

Type Parameters:

T - the static type

Parameters:

type - the dynamic type

Returns:

the adapter

Throws:

AsException - if no adapter is found

as

@Nonnull
<T> T as(@Nonnull
         java.lang.Class<T> type,
         @Nonnull
         As.NotFoundBehaviour<T> notFoundBehaviour)

Returns an adapter to this object of the specified type. If the implementation can find multiple compliant adapters, only one will be returned. If no adapter is found, the result provided by the given default behaviour will be returned.

Type Parameters:

T - the static type

Parameters:

type - the dynamic type

notFoundBehaviour - the behaviour to apply when an adapter is not found

Returns:

the adapter

maybeAs

@Nonnull
default <T> java.util.Optional<T> maybeAs(@Nonnull
                                          java.lang.Class<T> type)

Returns the requested role or an empty Optional.

Type Parameters:

T - the static type

Parameters:

type - the dynamic type

Returns:

the optional role

Since:

3.2-ALPHA-3

asOptional

@Nonnull
@Deprecated
default <T> java.util.Optional<T> asOptional(@Nonnull
                                             java.lang.Class<T> type)

Deprecated.

Use maybeAs(Class).

Type Parameters:

T - the static type

Parameters:

type - the dynamic type

Returns:

the optional role

asMany

@Nonnull
<T> java.util.Collection<T> asMany(@Nonnull
                                   java.lang.Class<T> type)

Searches for multiple adapters of the given type and returns them.

Type Parameters:

T - the static type

Parameters:

type - the dynamic type

Returns:

a collection of adapters, possibly empty