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Qualifier
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javax.inject</FONT>
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Annotation Type Qualifier</H2>
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<DT><PRE><FONT SIZE="-1">@Target(value=ANNOTATION_TYPE)
@Retention(value=RUNTIME)
@Documented
</FONT>public @interface <B>Qualifier</B></DL>
</PRE>
<P>
Identifies qualifier annotations. Anyone can define a new qualifier. A
qualifier annotation:
<ul>
<li>is annotated with <code>@Qualifier</code>, <code>@Retention(RUNTIME)</code>,
and typically <code>@Documented</code>.</li>
<li>can have attributes.</li>
<li>may be part of the public API, much like the dependency type, but
unlike implementation types which needn't be part of the public
API.</li>
<li>may have restricted usage if annotated with <code>@Target</code>. While
this specification covers applying qualifiers to fields and
parameters only, some injector configurations might use qualifier
annotations in other places (on methods or classes for example).</li>
</ul>
<p>For example:
<pre>
&#064;java.lang.annotation.Documented
&#064;java.lang.annotation.Retention(RUNTIME)
&#064;javax.inject.Qualifier
public @interface Leather {
Color color() default Color.TAN;
public enum Color { RED, BLACK, TAN }
}</pre>
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<DT><B>See Also:</B><DD><A HREF="../../javax/inject/Named.html" title="annotation in javax.inject"><CODE>@Named</CODE></A></DL>
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