Package org.springframework.data.repository.core.support

Interface RepositoryFragment<T>

All Known Implementing Classes:

RepositoryFragment.ImplementedRepositoryFragment, RepositoryFragment.StructuralRepositoryFragment

public interface RepositoryFragment<T>

Value object representing a repository fragment.

Repository fragments are individual parts that contribute method signatures. They are used to form a RepositoryComposition. Fragments can be purely structural or backed with an implementation.

Structural fragments are not backed by an implementation and are primarily used to discover the structure of a repository composition and to perform validations.

Implemented repository fragments consist of a signature contributor and the implementing object. A signature contributor may be an interface or just the implementing object providing the available signatures for a repository.

Fragments are immutable.

Since:

2.0

Author:

Mark Paluch

See Also:

• RepositoryComposition

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	RepositoryFragment.ImplementedRepositoryFragment<T>
static class	RepositoryFragment.StructuralRepositoryFragment<T>

Method Summary

Modifier and Type	Method	Description
default Optional<T>	getImplementation()
Class<?>	getSignatureContributor()
default boolean	hasMethod(Method method)	Attempt to find the Method by name and exact parameters.
static <T> RepositoryFragment<T>	implemented(Class<T> interfaceClass, T implementation)	Create an implemented RepositoryFragment from a interfaceClass backed by the implementation object.
static <T> RepositoryFragment<T>	implemented(T implementation)	Create an implemented RepositoryFragment backed by the implementation object.
default Stream<Method>	methods()
static <T> RepositoryFragment<T>	structural(Class<T> interfaceOrImplementation)	Create a structural RepositoryFragment given interfaceOrImplementation.
RepositoryFragment<T>	withImplementation(T implementation)	Implement a structural RepositoryFragment given its implementation object.

Method Details

implemented

static <T> RepositoryFragment<T> implemented(T implementation)

Create an implemented RepositoryFragment backed by the implementation object.

Parameters:

implementation - must not be null.

Returns:

implemented

static <T> RepositoryFragment<T> implemented(Class<T> interfaceClass,
 T implementation)

Create an implemented RepositoryFragment from a interfaceClass backed by the implementation object.

Parameters:

implementation - must not be null.

Returns:

structural

static <T> RepositoryFragment<T> structural(Class<T> interfaceOrImplementation)

Create a structural RepositoryFragment given interfaceOrImplementation.

Parameters:

interfaceOrImplementation - must not be null.

Returns:

hasMethod

default boolean hasMethod(Method method)

Attempt to find the Method by name and exact parameters. Returns true if the method was found or false otherwise.

Parameters:

method - must not be null.

Returns:

true if the method was found or false otherwise

getImplementation

default Optional<T> getImplementation()

Returns:

the optional implementation. Only available for implemented fragments. Structural fragments return always Optional.empty().

methods

default Stream<Method> methods()

Returns:

a Stream of methods exposed by this RepositoryFragment.

getSignatureContributor

Class<?> getSignatureContributor()

Returns:

the class/interface providing signatures for this RepositoryFragment.

withImplementation

RepositoryFragment<T> withImplementation(T implementation)

Implement a structural RepositoryFragment given its implementation object. Returns an implemented RepositoryFragment.

Parameters:

implementation - must not be null.

Returns:

a new implemented RepositoryFragment for implementation.