org.jboss.logging.processor.util

Class ElementHelper

java.lang.Object

org.jboss.logging.processor.util.ElementHelper

public final class ElementHelper
extends Object

An utility class to work with element.

Author:

Kevin Pollet - SERLI - (kevin.pollet@serli.com), James R. Perkins

Method Summary

Modifier and Type	Method and Description
static Collection<AnnotationMirror>	getAnnotations(Element element, Class<? extends Annotation> groupedAnnotation, Class<? extends Annotation> annotation) Returns annotations that are associated with the element that match the annotation parameter type.
static TypeElement	getClassAnnotationValue(Element element, Class<? extends Annotation> annotation) Retrieves the first attribute value from the annotation and assumes it's a class type.
static TypeElement	getClassAnnotationValue(Element element, Class<? extends Annotation> annotation, String attributeName) Retrieves the attribute value from the annotation and assumes it's a class type.
static List<TypeMirror>	getClassArrayAnnotationValue(Element element, Class<? extends Annotation> annotation, String attributeName) Retrieves the attribute value from the annotation and assumes it's an array classes.
static List<? extends TypeMirror>	getTypeArguments(Element element) Returns the type arguments for the element.
static List<? extends TypeMirror>	getTypeArguments(TypeMirror type) Returns the type arguments for the type.
static boolean	hasConstructor(Types types, Element element, List<TypeMirror> args) Checks whether or not a constructor matching the parameters exists.
static boolean	isAnnotatedWith(AnnotatedConstruct annotatedConstruct, Class<? extends Annotation> clazz) Check if an element is annotated with the given annotation.
static TypeMirror	toType(Elements elements, Class<?> type) Returns the type as a TypeMirror.
static TypeMirror	toType(ProcessingEnvironment processingEnv, Class<?> type) Returns the type as a TypeMirror.
static TypeElement	toTypeElement(Elements elements, Class<?> type) Returns the type as a TypeMirror.
static TypeElement	toTypeElement(ProcessingEnvironment processingEnv, Class<?> type) Returns the type as a TypeMirror.

Methods inherited from class java.lang.Object

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

Method Detail

getTypeArguments

public static List<? extends TypeMirror> getTypeArguments(Element element)

Returns the type arguments for the element. If the elements type is not a DeclaredType or the element does not have any type arguments an empty list is returned.

Parameters:

element - the element to get the type arguments for

Returns:

the type arguments or an empty list

getTypeArguments

public static List<? extends TypeMirror> getTypeArguments(TypeMirror type)

Returns the type arguments for the type. If the type is not a DeclaredType or the type does not have any type arguments an empty list is returned.

Parameters:

type - the type to get the type arguments for

Returns:

the type arguments or an empty list

isAnnotatedWith

public static boolean isAnnotatedWith(AnnotatedConstruct annotatedConstruct,
                                      Class<? extends Annotation> clazz)

Check if an element is annotated with the given annotation.

Parameters:

annotatedConstruct - the object to look for the annotation on.

clazz - the annotation class

Returns:

true if the element is annotated, otherwise false

Throws:

IllegalArgumentException - if element parameter is null

getClassAnnotationValue

public static TypeElement getClassAnnotationValue(Element element,
                                                  Class<? extends Annotation> annotation)

Retrieves the first attribute value from the annotation and assumes it's a class type.

Parameters:

element - the element the annotation is on

annotation - the annotation to get the value from

Returns:

a TypeElement representing the value for the first annotation attribute or null if no attributes were found

getClassAnnotationValue

public static TypeElement getClassAnnotationValue(Element element,
                                                  Class<? extends Annotation> annotation,
                                                  String attributeName)

Retrieves the attribute value from the annotation and assumes it's a class type.

Parameters:

element - the element the annotation is on

annotation - the annotation to get the value from

attributeName - the name of the attribute to retrieve the class value for

Returns:

a TypeElement representing the value for the annotation attribute or null if the attribute was not found

getClassArrayAnnotationValue

public static List<TypeMirror> getClassArrayAnnotationValue(Element element,
                                                            Class<? extends Annotation> annotation,
                                                            String attributeName)

Retrieves the attribute value from the annotation and assumes it's an array classes.

Parameters:

element - the element the annotation is on

annotation - the annotation to get the value from

attributeName - the name of the attribute to retrieve the class value array for

Returns:

a list of TypeMirror representing the value for the annotation attribute or an empty list

getAnnotations

public static Collection<AnnotationMirror> getAnnotations(Element element,
                                                          Class<? extends Annotation> groupedAnnotation,
                                                          Class<? extends Annotation> annotation)

Returns annotations that are associated with the element that match the annotation parameter type. If the groupedAnnotation is not null then any repeated annotations that math the annotation parameter type are also returned.

The groupedAnnotation must have a value attribute that includes an array of annotations that math the annotation parameter type.

Parameters:

element - the element to search for annotations

groupedAnnotation - the grouped annotation, e.g. collector for repeatable annotations, or null if not a repeatable annotation

annotation - the annotation to search for

Returns:

a collection matched annotations

hasConstructor

public static boolean hasConstructor(Types types,
                                     Element element,
                                     List<TypeMirror> args)

Checks whether or not a constructor matching the parameters exists.

Parameters:

types - the type utility used to compare the type arguments

element - the element that contains the constructors

args - the arguments the constructor should match

Returns:

true if a matching constructor was found otherwise false

toTypeElement

public static TypeElement toTypeElement(ProcessingEnvironment processingEnv,
                                        Class<?> type)

Returns the type as a TypeMirror.

Parameters:

processingEnv - the processing environment to get the elements utility

type - the type to create the TypeMirror for

Returns:

the type

toTypeElement

public static TypeElement toTypeElement(Elements elements,
                                        Class<?> type)

Returns the type as a TypeMirror.

Parameters:

elements - the element utility used to generate the tye type

type - the type to create the TypeMirror for

Returns:

the type

toType

public static TypeMirror toType(ProcessingEnvironment processingEnv,
                                Class<?> type)

Returns the type as a TypeMirror.

Parameters:

processingEnv - the processing environment to get the elements utility

type - the type to create the TypeMirror for

Returns:

the type

toType

public static TypeMirror toType(Elements elements,
                                Class<?> type)

Returns the type as a TypeMirror.

Parameters:

elements - the element utility used to generate the tye type

type - the type to create the TypeMirror for

Returns:

the type