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package org.codehaus.jackson.annotate;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Marker annotation similar to
* {@link javax.xml.bind.annotation.XmlValue}
* that indicates that results of the annotated "getter" method
* (which means signature must be that of getters; non-void return
* type, no args) is to be used as the single value to serialize
* for the instance. Usually value will be of a simple scalar type
* (String or Number), but it can be any serializable type (Collection,
* Map or Bean).
*
* At most one method of a Class can be annotated with this annotation;
* if more than one is found, an exception may be thrown.
* Also, if method signature is not compatible with Getters, an exception
* may be thrown.
* Whether exception is thrown or not is an implementation detail (due
* to filtering during introspection, some annotations may be skipped)
* and applications should not rely on specific behavior.
*
* A typical use case is that of annotating toString()
* method so that returned String value is Object's Json serialization.
*
* Boolean argument is only used so that sub-classes can "disable"
* annotation if necessary.
*/
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotation
public @interface JsonValue
{
/**
* Optional argument that defines whether this annotation is active
* or not. The only use for value 'false' if for overriding purposes.
* Overriding may be necessary when used
* with "mix-in annotations" (aka "annotation overrides").
* For most cases, however, default value of "true" is just fine
* and should be omitted.
*/
boolean value() default true;
}