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| javax.inject</FONT> |
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| Interface Provider<T></H2> |
| <HR> |
| <DL> |
| <DT><PRE>public interface <B>Provider<T></B></DL> |
| </PRE> |
| |
| <P> |
| Provides instances of <code>T</code>. Typically implemented by an injector. For |
| any type <code>T</code> that can be injected, you can also inject |
| <code>Provider<T></code>. Compared to injecting <code>T</code> directly, injecting |
| <code>Provider<T></code> enables: |
| |
| <ul> |
| <li>retrieving multiple instances.</li> |
| <li>lazy or optional retrieval of an instance.</li> |
| <li>breaking circular dependencies.</li> |
| <li>abstracting scope so you can look up an instance in a smaller scope |
| from an instance in a containing scope.</li> |
| </ul> |
| |
| <p>For example: |
| |
| <pre> |
| class Car { |
| @Inject Car(Provider<Seat> seatProvider) { |
| Seat driver = seatProvider.get(); |
| Seat passenger = seatProvider.get(); |
| ... |
| } |
| }</pre> |
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| <CODE> <A HREF="../../javax/inject/Provider.html" title="type parameter in Provider">T</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/inject/Provider.html#get()">get</A></B>()</CODE> |
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| Provides a fully-constructed and injected instance of <code>T</code>.</TD> |
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| get</H3> |
| <PRE> |
| <A HREF="../../javax/inject/Provider.html" title="type parameter in Provider">T</A> <B>get</B>()</PRE> |
| <DL> |
| <DD>Provides a fully-constructed and injected instance of <code>T</code>. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Throws:</B> |
| <DD><CODE>java.lang.RuntimeException</CODE> - if the injector encounters an error while |
| providing an instance. For example, if an injectable member on |
| <code>T</code> throws an exception, the injector may wrap the exception |
| and throw it to the caller of <code>get()</code>. Callers should not try |
| to handle such exceptions as the behavior may vary across injector |
| implementations and even different configurations of the same injector.</DL> |
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