io.micronaut.core.annotation

Annotation Type Introspected

@Documented
 @Retention(value=RUNTIME)
 @Target(value={TYPE,ANNOTATION_TYPE})
public @interface Introspected

An annotation that indicates a type should produce a BeanIntrospection at compilation time.

Typically to produce a BeanIntrospection one simply annotates a class with this annotation.

 @Introspected
 public class MyBean {
      ...
 }

An alternative approach is to use a AnnotationMapper to enable introspection for existing annotations such as javax.persistence.Entity.

If the classes you wish to introspect are already compiled then this annotation can be used on another class (doesn't matter which, but typically on a configuration class) to specify which existing compiled classes to produce BeanIntrospection instances for either through the classes() method or the packages() method. The latter uses compile time package scanning and for the moment is regarded as Experimental.

 @Introspected(classes=MyBean.class)
 public class MyConfiguration {
      ...
 }

Since:

1.1

Author:

graemerocher

See Also:

BeanIntrospection, BeanIntrospector

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
boolean	annotationMetadata Whether annotation metadata should be included in the inspection results.
java.lang.Class<?>[]	classes By default Introspected applies to the class it is applied on.
java.lang.Class<? extends java.lang.annotation.Annotation>[]	excludedAnnotations The annotation types that if present on the property cause the property to be excluded from results.
java.lang.String[]	excludes The property names to excludes.
java.lang.Class<? extends java.lang.annotation.Annotation>[]	includedAnnotations The annotation types that if present on the property cause only the properties with the specified annotation to be included in the result.
java.lang.String[]	includes The property names to include.
Introspected.IndexedAnnotation[]	indexed The annotation types that should be indexed for lookup via BeanIntrospection.getIndexedProperties(Class) or BeanIntrospection.getIndexedProperty(Class, String) if Introspected.IndexedAnnotation.member() is specified.
java.lang.String[]	packages By default Introspected applies to the class it is applied on.

Element Detail

classes

public abstract java.lang.Class<?>[] classes

By default Introspected applies to the class it is applied on. However if classes are specified introspections will instead be generated for each class specified. This is useful in cases where you cannot alter the source code and wish to generate introspections for already compiled classes.

Returns:

The classes to generate introspections for

Default:

{}

packages

public abstract java.lang.String[] packages

By default Introspected applies to the class it is applied on. However if packages are specified introspections will instead be generated for each classes in the given package. Note this only applies to already compiled classes, and classpath scanning will be used to find them. If the class is not compiled then apply the annotation directly to the classs instead.

Must be specified in combination with includedAnnotations()

Returns:

The packages to generate introspections for

Default:

{}

includes

public abstract java.lang.String[] includes

The property names to include. Defaults to all properties.

Returns:

The names of the properties

Default:

{}

excludes

public abstract java.lang.String[] excludes

The property names to excludes. Defaults to excluding none.

Returns:

The names of the properties

Default:

{}

excludedAnnotations

public abstract java.lang.Class<? extends java.lang.annotation.Annotation>[] excludedAnnotations

The annotation types that if present on the property cause the property to be excluded from results.

Returns:

The annotation types

Default:

{}

includedAnnotations

public abstract java.lang.Class<? extends java.lang.annotation.Annotation>[] includedAnnotations

The annotation types that if present on the property cause only the properties with the specified annotation to be included in the result.

Returns:

The annotation types

Default:

{}

annotationMetadata

public abstract boolean annotationMetadata

Whether annotation metadata should be included in the inspection results.

Returns:

True if annotation metadata should be included.

Default:

true

indexed

public abstract Introspected.IndexedAnnotation[] indexed

The annotation types that should be indexed for lookup via BeanIntrospection.getIndexedProperties(Class) or BeanIntrospection.getIndexedProperty(Class, String) if Introspected.IndexedAnnotation.member() is specified.

Property lookup indexing allows building indexes at compilation time for performing reverse property lookups. Consider for example a property with an annotation such as @Column(name="foo_bar". To lookup the property by "foo_bar" you can specify:

 @Introspected(
   indexed = @IndexedAnnotation(annotation=Column.class, member="name")
 )
 public class MyBean {
      ...
 }

With the above in place a reverse lookup on the column can be done using BeanIntrospection.getIndexedProperty(Class, String):

 BeanProperty property = introspection.getIndexedProperty(Column.class, "foo_bar").orElse(null);
 

Returns:

The indexed annotation types

Default:

{}