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| Provider (Guice 1) |
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| com.google.inject</FONT> |
| <BR> |
| Interface Provider<T></H2> |
| <DL> |
| <DT><DT><B>Type Parameters:</B><DD><CODE>T</CODE> - the type of object this provider provides</DL> |
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| <DT><PRE>public interface <B>Provider<T></B></DL> |
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| |
| <P> |
| Simply, any object capable of providing instances of type <code>T</code>. |
| Providers are used in numerous ways by the Guice framework: |
| |
| <ul> |
| <li>When the default means for obtaining instances (an injectable or |
| parameterless constructor) is insufficient for a particular binding, the |
| module can specify a custom <code>Provider</code> instead, to control exactly how |
| Guice creates or obtains instances for the binding. |
| |
| <li>An implementation class may always choose to have a <code>Provider<T></code> |
| instance injected, rather than having a <code>T</code> injected directly. This |
| may give you access to multiple instances, instances you wish to safely |
| mutate and discard, instances which are out of scope (e.g. using a |
| <code>@RequestScoped</code> object from within a <code>@SessionScoped</code> object), |
| or instances you don't want to initialize until they are absolutely needed. |
| |
| <li>A custom <A HREF="../../../com/google/inject/Scope.html" title="interface in com.google.inject"><CODE>Scope</CODE></A> is implemented as a decorator of |
| <code>Provider<T></code>, which decides when to delegate to the backing provider |
| and when to provide the instance some other way. |
| |
| <li>The <A HREF="../../../com/google/inject/Injector.html" title="interface in com.google.inject"><CODE>Injector</CODE></A> offers access to the <code>Provider<T></code> it uses |
| to fulfill requests for a given key, via the <A HREF="../../../com/google/inject/Injector.html#getProvider(com.google.inject.Key)"><CODE>Injector.getProvider(com.google.inject.Key<T>)</CODE></A> |
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| <CODE> <A HREF="../../../com/google/inject/Provider.html" title="type parameter in Provider">T</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../com/google/inject/Provider.html#get()">get</A></B>()</CODE> |
| |
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| Provides an instance of <code>T</code>.</TD> |
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| <A NAME="get()"><!-- --></A><H3> |
| get</H3> |
| <PRE> |
| <A HREF="../../../com/google/inject/Provider.html" title="type parameter in Provider">T</A> <B>get</B>()</PRE> |
| <DL> |
| <DD>Provides an instance of <code>T</code>. Must never return <code>null</code>. |
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