Package io.micronaut.core.beans

Interface BeanIntrospection<T>

Type Parameters:

T - The bean type

All Superinterfaces:

AnnotationMetadata, AnnotationMetadataDelegate, AnnotationMetadataProvider, AnnotationSource, ArgumentCoercible<T>, BeanInfo<T>

All Known Subinterfaces:

UnsafeBeanInstantiationIntrospection<T>

All Known Implementing Classes:

AbstractInitializableBeanIntrospection

public interface BeanIntrospection<T>
extends AnnotationMetadataDelegate, BeanInfo<T>

A BeanIntrospection is the result of compile time computation of a beans properties and annotation metadata.

This interface allows you to instantiate and read and write to bean properties without using reflection or caching reflective metadata, which is expensive from a memory consumption perspective.

BeanIntrospection instances can be obtained either via getIntrospection(Class) or via the BeanIntrospector.

A BeanIntrospection is only computed at compilation time if the class is annotated with Introspected.

Since:

1.1

Author:

graemerocher

See Also:

• BeanIntrospector
• Introspected

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	BeanIntrospection.Builder<T>	A builder style API for creating instances that abstracts whether the instance is a record, bean or created by another builder.

Field Summary

Fields inherited from interface io.micronaut.core.annotation.AnnotationMetadata

CLASS_NAME_SUFFIX, EMPTY_METADATA, VALUE_MEMBER

Fields inherited from interface io.micronaut.core.annotation.AnnotationSource

EMPTY

Method Summary

Modifier and Type	Method	Description
@NonNull BeanIntrospection.Builder<T>	builder()
default @NonNull Collection<BeanMethod<T,Object>>	getBeanMethods()	Returns the BeanMethod instances for this introspection.
@NonNull Collection<BeanProperty<T,Object>>	getBeanProperties()
@NonNull Class<T>	getBeanType()	The bean type.
default @NonNull BeanConstructor<T>	getConstructor()
default @NonNull Argument<?>[]	getConstructorArguments()	The constructor arguments needed to instantiate the bean.
@NonNull Collection<BeanProperty<T,Object>>	getIndexedProperties(@NonNull Class<? extends Annotation> annotationType)	Get all the bean properties annotated for the given annotation type.
default @NonNull Optional<BeanProperty<T,Object>>	getIndexedProperty(@NonNull Class<? extends Annotation> annotationType)	Get all the bean properties annotated for the given type.
@NonNull Optional<BeanProperty<T,Object>>	getIndexedProperty(@NonNull Class<? extends Annotation> annotationType, @NonNull String annotationValue)	Get all the bean properties annotated for the given type.
static <T2> BeanIntrospection<T2>	getIntrospection(Class<T2> type)	Obtains an introspection from the default BeanIntrospector.
default @NonNull Optional<BeanProperty<T,Object>>	getProperty(@NonNull String name)	Obtain a property by name.
default <P> @NonNull Optional<BeanProperty<T,P>>	getProperty(@NonNull String name, @NonNull Class<P> type)	Obtain a property by name and type.
default @NonNull String[]	getPropertyNames()	The property names as an array.
default <P> @NonNull BeanProperty<T,P>	getRequiredProperty(@NonNull String name, @NonNull Class<P> type)	Gets a property of the given name and type or throws IntrospectionException if the property is not present.
default boolean	hasBuilder()	Does the introspection have a backing builder.
T	instantiate()	Instantiates an instance of the bean, throwing an exception is instantiation is not possible.
T	instantiate(boolean strictNullable, Object... arguments)	Instantiates an instance of the bean, throwing an exception is instantiation is not possible.
default T	instantiate(Object... arguments)	Instantiates an instance of the bean, throwing an exception is instantiation is not possible.
default boolean	isBuildable()	Can the introspection be constructed with builder().
default int	propertyIndexOf(@NonNull String name)	Obtain the property index position.

Methods inherited from interface io.micronaut.core.annotation.AnnotationMetadata

enumValuesSet, enumValuesSet, getValues, hasDeclaredStereotype, hasEvaluatedExpressions, hasStereotypeNonRepeating, isAnnotationPresent, isDeclaredAnnotationPresent

Methods inherited from interface io.micronaut.core.annotation.AnnotationMetadataDelegate

booleanValue, booleanValue, booleanValue, booleanValue, classValue, classValue, classValue, classValue, classValues, classValues, classValues, classValues, copyAnnotationMetadata, doubleValue, doubleValue, doubleValue, enumValue, enumValue, enumValue, enumValue, enumValues, enumValues, enumValues, enumValues, findAnnotation, findAnnotation, findDeclaredAnnotation, findDeclaredAnnotation, findRepeatableAnnotation, findRepeatableAnnotation, getAnnotation, getAnnotation, getAnnotationNameByStereotype, getAnnotationNameByStereotype, getAnnotationNames, getAnnotationNamesByStereotype, getAnnotationNamesByStereotype, getAnnotationType, getAnnotationType, getAnnotationTypeByStereotype, getAnnotationTypeByStereotype, getAnnotationTypesByStereotype, getAnnotationTypesByStereotype, getAnnotationTypesByStereotype, getAnnotationValuesByName, getAnnotationValuesByStereotype, getAnnotationValuesByType, getDeclaredAnnotation, getDeclaredAnnotation, getDeclaredAnnotationNameByStereotype, getDeclaredAnnotationNames, getDeclaredAnnotationNamesByStereotype, getDeclaredAnnotationTypeByStereotype, getDeclaredAnnotationTypeByStereotype, getDeclaredAnnotationValuesByName, getDeclaredAnnotationValuesByType, getDeclaredMetadata, getDeclaredStereotypeAnnotationNames, getDefaultValue, getDefaultValue, getDefaultValue, getDefaultValue, getDefaultValues, getStereotypeAnnotationNames, getTargetAnnotationMetadata, getValue, getValue, getValue, getValue, getValue, getValue, getValue, getValue, getValue, getValue, getValue, getValue, getValues, getValues, hasAnnotation, hasAnnotation, hasDeclaredAnnotation, hasDeclaredAnnotation, hasDeclaredStereotype, hasDeclaredStereotype, hasDeclaredStereotype, hasPropertyExpressions, hasSimpleAnnotation, hasSimpleDeclaredAnnotation, hasStereotype, hasStereotype, hasStereotype, hasStereotype, intValue, intValue, intValue, isAnnotationPresent, isDeclaredAnnotationPresent, isEmpty, isFalse, isFalse, isPresent, isPresent, isRepeatableAnnotation, isRepeatableAnnotation, isTrue, isTrue, longValue, longValue, stringValue, stringValue, stringValue, stringValue, stringValues, stringValues, stringValues, stringValues, synthesize, synthesize, synthesizeAll, synthesizeAnnotationsByType, synthesizeDeclared, synthesizeDeclared, synthesizeDeclared, synthesizeDeclaredAnnotationsByType

Methods inherited from interface io.micronaut.core.annotation.AnnotationMetadataProvider

getAnnotationMetadata

Methods inherited from interface io.micronaut.core.beans.BeanInfo

asArgument, getGenericBeanType

Method Details

getBeanProperties

@NonNull
@NonNull Collection<BeanProperty<T,Object>> getBeanProperties()

Returns:

An immutable collection of properties.

getIndexedProperties

@NonNull
@NonNull Collection<BeanProperty<T,Object>> getIndexedProperties(@NonNull
 @NonNull Class<? extends Annotation> annotationType)

Get all the bean properties annotated for the given annotation type. If the annotation is Introspected.indexed() by the given annotation, then it will be included in the resulting list.

Parameters:

annotationType - The annotation type

Returns:

An immutable collection of properties.

See Also:

• Introspected.indexed()

builder

@NonNull
@NonNull BeanIntrospection.Builder<T> builder()

Returns:

Obtain a builder for this introspection.

Since:

4.1.0

isBuildable

default boolean isBuildable()

Can the introspection be constructed with builder().

Returns:

True if it can

Since:

4.1.0

hasBuilder

default boolean hasBuilder()

Does the introspection have a backing builder.

This method exists so that consumers can choose to optimize towards direct instantiation using instantiate() if no builder is present.

Returns:

True if a backing builder is present.

Since:

4.1.0

instantiate

@NonNull
T instantiate()
       throws InstantiationException

Instantiates an instance of the bean, throwing an exception is instantiation is not possible.

Returns:

An instance

Throws:

InstantiationException - If the bean cannot be instantiated or the arguments are not satisfied.

instantiate

@NonNull
default T instantiate(Object... arguments)
               throws InstantiationException

Instantiates an instance of the bean, throwing an exception is instantiation is not possible.

Parameters:

arguments - The arguments required to instantiate bean. Should match the types returned by getConstructorArguments()

Returns:

An instance

Throws:

InstantiationException - If the bean cannot be instantiated.

instantiate

@NonNull
T instantiate(boolean strictNullable,
 Object... arguments)
       throws InstantiationException

Instantiates an instance of the bean, throwing an exception is instantiation is not possible.

Parameters:

strictNullable - If true, require null parameters to be annotated with a nullable annotation

arguments - The arguments required to instantiate bean. Should match the types returned by getConstructorArguments()

Returns:

An instance

Throws:

InstantiationException - If the bean cannot be instantiated.

getBeanType

@NonNull
@NonNull Class<T> getBeanType()

The bean type.

Specified by:

getBeanType in interface BeanInfo<T>

Returns:

The bean type

getIndexedProperty

@NonNull
@NonNull Optional<BeanProperty<T,Object>> getIndexedProperty(@NonNull
 @NonNull Class<? extends Annotation> annotationType,
 @NonNull
 @NonNull String annotationValue)

Get all the bean properties annotated for the given type.

Parameters:

annotationType - The annotation type

annotationValue - The annotation value

Returns:

An immutable collection of properties.

See Also:

• Introspected.indexed()

getBeanMethods

@NonNull
default @NonNull Collection<BeanMethod<T,Object>> getBeanMethods()

Returns the BeanMethod instances for this introspection.

The BeanMethod instances are only those methods annotated with io.micronaut.context.annotation.Executable and hence represent a subset of the actual methods of the class and do not include any methods that are exposed as BeanProperty instances.

Returns:

An immutable collection of methods.

Since:

2.3.0

getIndexedProperty

@NonNull
default @NonNull Optional<BeanProperty<T,Object>> getIndexedProperty(@NonNull
 @NonNull Class<? extends Annotation> annotationType)

Get all the bean properties annotated for the given type.

Parameters:

annotationType - The annotation type

Returns:

An immutable collection of properties.

See Also:

• Introspected.indexed()

getConstructorArguments

@NonNull
default @NonNull Argument<?>[] getConstructorArguments()

The constructor arguments needed to instantiate the bean.

Returns:

An argument array

getProperty

@NonNull
default @NonNull Optional<BeanProperty<T,Object>> getProperty(@NonNull
 @NonNull String name)

Obtain a property by name.

Parameters:

name - The name of the property

Returns:

A bean property if found

propertyIndexOf

default int propertyIndexOf(@NonNull
 @NonNull String name)

Obtain the property index position.

Parameters:

name - The name of the property

Returns:

A property index or -1 of not found.

Since:

3.1

getRequiredProperty

@NonNull
default <P> @NonNull BeanProperty<T,P> getRequiredProperty(@NonNull
 @NonNull String name,
 @NonNull
 @NonNull Class<P> type)

Gets a property of the given name and type or throws IntrospectionException if the property is not present.

Type Parameters:

P - The property generic type

Parameters:

name - The name

type - The type

Returns:

The property

getProperty

@NonNull
default <P> @NonNull Optional<BeanProperty<T,P>> getProperty(@NonNull
 @NonNull String name,
 @NonNull
 @NonNull Class<P> type)

Obtain a property by name and type.

Type Parameters:

P - The property type

Parameters:

name - The name of the property

type - The property type to search for

Returns:

A bean property if found

getPropertyNames

@NonNull
default @NonNull String[] getPropertyNames()

The property names as an array.

Returns:

The properties names

getConstructor

@NonNull
default @NonNull BeanConstructor<T> getConstructor()

Returns:

The bean constructor.

Since:

3.0.0

getIntrospection

static <T2> BeanIntrospection<T2> getIntrospection(Class<T2> type)

Obtains an introspection from the default BeanIntrospector.

Type Parameters:

T2 - The generic type

Parameters:

type - The type

Returns:

The introspection

Throws:

IntrospectionException - If the introspection cannot be found or errors when loading