io.micronaut.core.annotation

Class AnnotationUtil

java.lang.Object

io.micronaut.core.annotation.AnnotationUtil

@Internal
public class AnnotationUtil
extends Object

Internal utility methods for annotations. For Internal and framework use only. Do not use in application code.

Since:

1.0

Author:

Graeme Rocher

Field Summary

Fields

Modifier and Type	Field and Description
static AnnotatedElement	EMPTY_ANNOTATED_ELEMENT An empty re-usable element.
static List<String>	INTERNAL_ANNOTATION_NAMES
static String	KOTLIN_METADATA Constant for Kotlin metadata.
static AnnotatedElement[]	ZERO_ANNOTATED_ELEMENTS Constant indicating an zero annotation.
static Annotation[]	ZERO_ANNOTATIONS Constant indicating an zero annotation.

Constructor Summary

Constructors

Constructor and Description
AnnotationUtil()

Method Summary

Modifier and Type	Method and Description
static boolean	areEqual(Object o1, Object o2) Computes whether 2 annotation values are equal.
static int	calculateHashCode(Map<? extends CharSequence,Object> values) Calculates the hash code of annotation values.
static List<String>	internListOf(Object... objects) Converts the given objects into a set of interned strings contained within an internal pool of lists.
static Map<String,Object>	internMapOf(Object... values) Converts the given objects into a map of interned strings where the keys and values are alternating entries in the passed array.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

KOTLIN_METADATA

public static final String KOTLIN_METADATA

Constant for Kotlin metadata.

See Also:

Constant Field Values

INTERNAL_ANNOTATION_NAMES

public static final List<String> INTERNAL_ANNOTATION_NAMES

ZERO_ANNOTATIONS

public static final Annotation[] ZERO_ANNOTATIONS

Constant indicating an zero annotation.

ZERO_ANNOTATED_ELEMENTS

public static final AnnotatedElement[] ZERO_ANNOTATED_ELEMENTS

Constant indicating an zero annotation.

EMPTY_ANNOTATED_ELEMENT

public static final AnnotatedElement EMPTY_ANNOTATED_ELEMENT

An empty re-usable element.

Constructor Detail

AnnotationUtil

public AnnotationUtil()

Method Detail

internListOf

public static List<String> internListOf(Object... objects)

Converts the given objects into a set of interned strings contained within an internal pool of lists. See String.intern().

This method serves the purpose of reducing memory footprint by pooling common lists of annotations in compiled AnnotationMetadata

Parameters:

objects - The objects

Returns:

A unmodifiable, pooled set of strings

internMapOf

public static Map<String,Object> internMapOf(Object... values)

Converts the given objects into a map of interned strings where the keys and values are alternating entries in the passed array. See String.intern().

The values stored at even number positions will be converted to strings and interned.

Parameters:

values - The objects

Returns:

An unmodifiable set of strings

See Also:

CollectionUtils.mapOf(Object...)

calculateHashCode

public static int calculateHashCode(Map<? extends CharSequence,Object> values)

Calculates the hash code of annotation values.

Parameters:

values - The map to calculate values' hash code

Returns:

The hash code

areEqual

public static boolean areEqual(Object o1,
                               Object o2)

Computes whether 2 annotation values are equal.

Parameters:

o1 - One object

o2 - Another object

Returns:

Whether both objects are equal