org.glassfish.hk2.api

Interface IterableProvider<T>

Type Parameters:

T - The type of this IterableProvider

All Superinterfaces:

Iterable<T>, javax.inject.Provider<T>

public interface IterableProvider<T>
extends javax.inject.Provider<T>, Iterable<T>

This object can be injected rather than Provider when it is desired to iterate over more than one returned instance of the type. This interface also has several methods which allow the user to further narrow down the selected services at runtime. It can also provide an Iterable of ServiceHandle for finer control of the lifecycle of services found

The iterator returned will be in ranked order (with DescriptorRank as primary key, largest rank first and ServiceID as secondary key, smallest id first)

Author:

jwells

Method Summary

Methods

Modifier and Type	Method and Description
ServiceHandle<T>	getHandle() Rather than getting the service directly with get (in which case the returned service cannot be disposed of) this method will instead return a service handle for the current best service.
int	getSize() Returns the size of the iterator that would be returned
Iterable<ServiceHandle<T>>	handleIterator() This version of iterator returns an iterator of ServiceHandles rather than returning the services (which then have no way to be properly destroyed)
IterableProvider<T>	named(String name) Returns an IterableProvider that is further qualified with the given name
<U> IterableProvider<U>	ofType(Type type) Returns an IterableProvider that is of the given type.
IterableProvider<T>	qualifiedWith(Annotation... qualifiers) A set of qualifiers to further restrict this iterator to.

Methods inherited from interface javax.inject.Provider

get

Methods inherited from interface java.lang.Iterable

iterator

Method Detail

getHandle

ServiceHandle<T> getHandle()

Rather than getting the service directly with get (in which case the returned service cannot be disposed of) this method will instead return a service handle for the current best service.

Returns:

A ServiceHandle for the service, or null if there is currently no service definition available

getSize

int getSize()

Returns the size of the iterator that would be returned

Returns:

the size of the iterator that would be chosen

named

IterableProvider<T> named(String name)

Returns an IterableProvider that is further qualified with the given name

Parameters:

name - The value field of the Named annotation parameter. Must not be null

Returns:

An iterable provider further qualified with the given name

ofType

<U> IterableProvider<U> ofType(Type type)

Returns an IterableProvider that is of the given type. This type must be one of the type safe contracts of the original iterator

Parameters:

type - The type to restrict the returned iterator to

Returns:

An iterator restricted to only providing the given type

qualifiedWith

IterableProvider<T> qualifiedWith(Annotation... qualifiers)

A set of qualifiers to further restrict this iterator to.

Parameters:

qualifiers - The qualifiers to further restrict this iterator to

Returns:

An iterator restricted with the given qualifiers

handleIterator

Iterable<ServiceHandle<T>> handleIterator()

This version of iterator returns an iterator of ServiceHandles rather than returning the services (which then have no way to be properly destroyed)

Returns:

An iterator of ServiceHandles for the set of services represtended by this IterableProvider