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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. A qualifier annotates an injectable field
or parameter and, combined with the type, identifies the implementation to
inject. Qualifiers are optional and no more than one should annotate a
single field or parameter. The qualifiers are bold in the following
example:
<pre>
public class Car {
@Inject private <b>@Leather</b> Provider<Seat> seatProvider;
@Inject void install(<b>@Tinted</b> Windshield windshield,
<b>@Big</b> Trunk trunk) { ... }
}</pre>
<p>If one injectable method overrides another, the overriding method's
parameters do not automatically inherit qualifiers from the overridden
method's parameters.
<p>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>is <i>not</i> 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>
<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>
</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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