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| javax.inject</FONT> |
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| Annotation Type Qualifier</H2> |
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| <DL> |
| <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 only covers applying qualifiers to fields and |
| parameters, some injector configurations might use qualifier |
| annotations in other places (on methods or classes for example).</li> |
| </ul> |
| |
| <p>For example: |
| |
| <pre> |
| @java.lang.annotation.Documented |
| @java.lang.annotation.Retention(RUNTIME) |
| @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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