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package javax.faces.convert;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.annotation.Inherited;
import javax.inject.Qualifier;
/**
* <p class="changed_added_2_0"><span
* class="changed_modified_2_2">The</span> presence of this annotation
* on a class automatically registers the class with the runtime as a
* {@link Converter}. The value of the {@link #value} attribute is
* taken to be <em>converter-id</em>, the value of the {@link #forClass}
* attribute is taken to be <em>converter-for-class</em> and the fully
* qualified class name of the class to which this annotation is
* attached is taken to be the <em>converter-class</em>. The
* implementation must guarantee that for each class annotated with
* <code>FacesConverter</code>, found with the algorithm in section
* JSF.11.5, the proper variant of
* <code>Application.addConverter()</code> is called. If
* <em>converter-id</em> is not the empty string, {@link
* javax.faces.application.Application#addConverter(java.lang.String,java.lang.String)}
* is called, passing the derived <em>converter-id</em> as the first
* argument and the derived <em>converter-class</em> as the second
* argument. If <em>converter-id</em> is the empty string, {@link
* javax.faces.application.Application#addConverter(java.lang.Class,java.lang.String)}
* is called, passing the <em>converter-for-class</em> as the first
* argument and the derived <em>converter-class</em> as the second
* argument. The implementation must guarantee that all such calls to
* <code>addConverter()</code> happen during application startup time
* and before any requests are serviced.</p>
* <div class="changed_added_2_2">
* <p>The preceding text contains an important
* subtlety which application users should understand. It is not
* possible to use a single {@code @FacesConverter} annotation to
* register a single {@code Converter} implementation both in the {@code
* by-class} and the {@code by-converter-id} data structures. One way
* to achieve this result is to put the actual converter logic in an
* abstract base class, without a {@code @FacesConverter} annotation,
* and derive two sub-classes, each with a {@code @FacesConverter}
* annotation. One sub-class has a {@code value} attribute but no
* {@code forClass} attribute, and the other sub-class has the converse.</p>
* <p>Please see the ViewDeclarationLanguage documentation for {@code
* <h:selectManyListBox>} for another important subtlety regarding
* converters and collections.</p>
* </div>
*
*/
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE, ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER})
@Inherited
@Qualifier
public @interface FacesConverter {
/**
* <p class="changed_added_2_0">The value of this annotation
* attribute is taken to be the <em>converter-id</em> with which
* instances of this class of converter can be instantiated by
* calling {@link
* javax.faces.application.Application#createConverter(java.lang.String)}.</p>
*
* @return the converter-id
*/
String value() default "";
/**
* <p class="changed_added_2_0">The value of this annotation
* attribute is taken to be the <em>converter-for-class</em> with
* which instances of this class of converter can be instantiated by
* calling {@link
* javax.faces.application.Application#createConverter(java.lang.Class)}.</p>
*
* @return the class
*/
Class forClass() default Object.class;
/**
* <p class="changed_added_2_3">The value of this annotation attribute is
* taken to be an indicator that flags whether or not the given converter
* is a CDI managed converter. </p>
*
* @return whether or not this converter is managed by CDI
*/
boolean managed() default false;
}