com.google.inject

Annotation Type Inject

@Target(value={METHOD,CONSTRUCTOR,FIELD})
@Retention(value=RUNTIME)
@Documented
public @interface Inject

Annotates members of your implementation class (constructors, methods and fields) into which the Injector should inject values. The Injector fulfills injection requests for:

• Every instance it constructs. The class being constructed must have exactly one of its constructors marked with @Inject or must have a constructor taking no parameters. The Injector then proceeds to perform field and method injections.
• Pre-constructed instances passed to Injector.injectMembers(java.lang.Object), LinkedBindingBuilder.toInstance(Object) and LinkedBindingBuilder.toProvider(javax.inject.Provider). In this case all constructors are, of course, ignored.
• Static fields and methods of classes which any Module has specifically requested static injection for, using Binder.requestStaticInjection(java.lang.Class<?>...).

In all cases, a member can be injected regardless of its Java access specifier (private, default, protected, public).

Author:

crazybob@google.com (Bob Lee)

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
boolean	optional If true, and the appropriate binding is not found, the Injector will skip injection of this method or field rather than produce an error.

Element Detail

optional

public abstract boolean optional

If true, and the appropriate binding is not found, the Injector will skip injection of this method or field rather than produce an error. When applied to a field, any default value already assigned to the field will remain (guice will not actively null out the field). When applied to a method, the method will only be invoked if bindings for all parameters are found. When applied to a constructor, an error will result upon Injector creation.

Default:

false