ProviderLookup (guice 4.1.0)

java.lang.Object
- com.google.inject.spi.ProviderLookup<T>

All Implemented Interfaces:

Element
```
public final class ProviderLookup<T>
extends Object
implements Element
```
A lookup of the provider for a type. Lookups are created explicitly in a module using getProvider() statements:
```
     Provider<PaymentService> paymentServiceProvider
         = getProvider(PaymentService.class);
```
Since:

2.0

Author:

jessewilson@google.com (Jesse Wilson)

Constructor Summary

Constructors
Constructor and Description

ProviderLookup(Object source, Dependency<T> dependency)

ProviderLookup(Object source, Key<T> key)

Constructors
Constructor and Description
`ProviderLookup(Object source, Dependency<T> dependency)`
`ProviderLookup(Object source, Key<T> key)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`<T> T`	`acceptVisitor(ElementVisitor<T> visitor)` Accepts an element visitor.
`void`	`applyTo(Binder binder)` Writes this module element to the given binder (optional operation).
`Provider<T>`	`getDelegate()` Returns the delegate provider, or `null` if it has not yet been initialized.
`Dependency<T>`	`getDependency()`
`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 Detail
  - ProviderLookup
```
public ProviderLookup(Object source,
                      Key<T> key)
```
  - ProviderLookup
```
public ProviderLookup(Object source,
                      Dependency<T> dependency)
```
    Since:
    
    4.0
- Method Detail
  - 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()
```
  - getDependency
```
public Dependency<T> getDependency()
```
    Since:
    
    4.0
  - 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
  - applyTo
```
public void applyTo(Binder binder)
```
    Description copied from interface: Element
    
    Writes this module element to the given binder (optional operation).
    
    Specified by:
    
    applyTo in interface Element
    
    Parameters:
    
    binder - to apply configuration element to
  - getDelegate
```
public Provider<T> getDelegate()
```
    Returns the delegate provider, or null if it has not yet been initialized. The delegate will be initialized when this element is processed, or otherwise used to create an injector.
  - 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.

Class ProviderLookup<T>

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ProviderLookup

ProviderLookup

Method Detail

getSource

getKey

getDependency

acceptVisitor

initializeDelegate

applyTo

getDelegate

getProvider