Module org.elasticsearch.server

Package org.elasticsearch.injection.guice.spi

Class ProviderLookup<T>

java.lang.Object

org.elasticsearch.injection.guice.spi.ProviderLookup<T>

All Implemented Interfaces:

Element

public final class ProviderLookup<T>
extends Object
implements Element

A lookup of the provider for a type.

     Provider<PaymentService> paymentServiceProvider
         = getProvider(PaymentService.class);

Since:

2.0

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ProviderLookup.ProviderImpl<T>

Constructor Summary

Constructors

Constructor	Description
ProviderLookup(Object source, Key<T> key)

Method Summary

Modifier and Type	Method	Description
<T> T	acceptVisitor(ElementVisitor<T> visitor)	Accepts an element visitor.
Key<T>	getKey()
Provider<T>	getProvider()	Returns the looked up provider.
Object	getSource()	Returns an arbitrary object containing information about the "place" where this element was configured.
void	initializeDelegate(Provider<T> delegate)	Sets the actual provider.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ProviderLookup

public ProviderLookup(Object source,
 Key<T> key)

Method Details

getSource

public Object getSource()

Description copied from interface: Element

Returns an arbitrary object containing information about the "place" where this element was configured. Used by Guice in the production of descriptive error messages.

Tools might specially handle types they know about; StackTraceElement is a good example. Tools should simply call toString() on the source object if the type is unfamiliar.

Specified by:

getSource in interface Element

getKey

public Key<T> getKey()

acceptVisitor

public <T> T acceptVisitor(ElementVisitor<T> visitor)

Description copied from interface: Element

Accepts an element visitor. Invokes the visitor method specific to this element's type.

Specified by:

acceptVisitor in interface Element

Parameters:

visitor - to call back on

initializeDelegate

public void initializeDelegate(Provider<T> delegate)

Sets the actual provider.

Throws:

IllegalStateException - if the delegate is already set

getProvider

public Provider<T> getProvider()

Returns the looked up provider. The result is not valid until this lookup has been initialized, which usually happens when the injector is created. The provider will throw an IllegalStateException if you try to use it beforehand.