dagger.producers

Class Produced<T>

java.lang.Object

dagger.producers.Produced<T>

@Beta
 @CheckReturnValue
public abstract class Produced<T>
extends Object

An interface that represents the result of a production of type T, or an exception that was thrown during that production. For any type T that can be injected, you can also inject Produced<T>, which enables handling of any exceptions that were thrown during the production of T.

For example:

    @Produces Html getResponse(
       UserInfo criticalInfo,  Produced<ExtraInfo> noncriticalInfo) {
     try {
       return new Html(criticalInfo, noncriticalInfo.get());
     } catch (ExecutionException e) {
       logger.warning(e, "Noncritical info");
       return new Html(criticalInfo);
     }
   }
 

Author:

Jesse Beder

Method Summary

Modifier and Type	Method and Description
abstract boolean	equals(Object o) Two Produced objects compare equal if both are successful with equal values, or both are failed with equal exceptions.
static <T> Produced<T>	failed(Throwable throwable) Returns a failed Produced, whose get() will throw an ExecutionException with the given cause.
abstract T	get() Returns the result of a production.
abstract int	hashCode() Returns an appropriate hash code to match equals(Object).
static <T> Produced<T>	successful(T value) Returns a successful Produced, whose get() will return the given value.

Methods inherited from class java.lang.Object

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

Method Detail

get

public abstract T get()
               throws ExecutionException

Returns the result of a production.

Throws:

ExecutionException - if the production threw an exception

equals

public abstract boolean equals(Object o)

Two Produced objects compare equal if both are successful with equal values, or both are failed with equal exceptions.

Overrides:

equals in class Object

hashCode

public abstract int hashCode()

Returns an appropriate hash code to match equals(Object).

Overrides:

hashCode in class Object

successful

public static <T> Produced<T> successful(@Nullable
                                         T value)

Returns a successful Produced, whose get() will return the given value.

failed

public static <T> Produced<T> failed(Throwable throwable)

Returns a failed Produced, whose get() will throw an ExecutionException with the given cause.