org.checkerframework.javacutil

Class AnnotationUtils

java.lang.Object

org.checkerframework.javacutil.AnnotationUtils

public class AnnotationUtils
extends Object

A utility class for working with annotations.

Method Summary

Modifier and Type	Method and Description
static @Interned String	annotationName(AnnotationMirror annotation)
static Comparator<AnnotationMirror>	annotationOrdering() provide ordering for AnnotationMirror based on their fully qualified name.
static boolean	areSame(@Nullable AnnotationMirror a1, @Nullable AnnotationMirror a2) Checks if both annotations are the same.
static boolean	areSame(Collection<? extends AnnotationMirror> c1, Collection<? extends AnnotationMirror> c2) Checks that two collections contain the same annotations.
static boolean	areSameByClass(AnnotationMirror am, Class<? extends Annotation> anno) Checks that the annotation am has the name of anno.
static boolean	areSameByName(AnnotationMirror am, @Interned String aname) Checks that the annotation am has the name aname.
static boolean	areSameIgnoringValues(AnnotationMirror a1, AnnotationMirror a2)
static void	clear()
static boolean	containsSame(Collection<? extends AnnotationMirror> c, AnnotationMirror anno) Checks that the collection contains the annotation.
static boolean	containsSameByClass(Collection<? extends AnnotationMirror> c, Class<? extends Annotation> anno) Checks that the collection contains the annotation.
static boolean	containsSameIgnoringValues(Collection<? extends AnnotationMirror> c, AnnotationMirror anno) Checks that the collection contains the annotation ignoring values.
static <V> Map<AnnotationMirror,V>	createAnnotationMap() Create a map suitable for storing AnnotationMirror as keys.
static Set<AnnotationMirror>	createAnnotationSet() Constructs a Set suitable for storing AnnotationMirrors.
static AnnotationMirror	fromClass(Elements elements, Class<? extends Annotation> clazz) Creates an AnnotationMirror given by a particular annotation class.
static AnnotationMirror	fromName(Elements elements, CharSequence name) Creates an AnnotationMirror given by a particular fully-qualified name.
static <T> T	getElementValue(AnnotationMirror anno, CharSequence name, Class<T> expectedType, boolean useDefaults) Get the attribute with the name name of the annotation anno.
static <T> List<T>	getElementValueArray(AnnotationMirror anno, CharSequence name, Class<T> expectedType, boolean useDefaults) Get the attribute with the name name of the annotation anno, where the attribute has an array type.
static Class<?>	getElementValueClass(AnnotationMirror anno, CharSequence name, boolean useDefaults) Get the Class that is referenced by attribute 'name'.
static Name	getElementValueClassName(AnnotationMirror anno, CharSequence name, boolean useDefaults) Get the Name of the class that is referenced by attribute 'name'.
static <T extends Enum<T>> T	getElementValueEnum(AnnotationMirror anno, CharSequence name, Class<T> t, boolean useDefaults) Version that is suitable for Enum elements.
static <T extends Enum<T>> List<T>	getElementValueEnumArray(AnnotationMirror anno, CharSequence name, Class<T> t, boolean useDefaults) Get the attribute with the name name of the annotation anno, or the default value if no attribute is present explicitly, where the attribute has an array type and the elements are Enums.
static Map<? extends ExecutableElement,? extends AnnotationValue>	getElementValuesWithDefaults(AnnotationMirror ad) Returns the values of an annotation's attributes, including defaults.
static <T> boolean	hasElementValue(AnnotationMirror anno, CharSequence name) Verify whether the attribute with the name name exists in the annotation anno.
static boolean	hasInheritedMeta(AnnotationMirror anno) Returns true if the given annotation has a @Inherited meta-annotation.
static <T> void	updateMappingToImmutableSet(Map<T,Set<AnnotationMirror>> map, T key, Set<AnnotationMirror> newQual) See checkers.types.QualifierHierarchy#updateMappingToMutableSet(QualifierHierarchy, Map, Object, AnnotationMirror) (Not linked because it is in an independent project.

Methods inherited from class java.lang.Object

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

Method Detail

clear

public static void clear()

fromName

public static AnnotationMirror fromName(Elements elements,
                                        CharSequence name)

Creates an AnnotationMirror given by a particular fully-qualified name. getElementValues on the result returns an empty map.

Parameters:

elements - the element utilities to use

name - the name of the annotation to create

Returns:

an AnnotationMirror of type name

fromClass

public static AnnotationMirror fromClass(Elements elements,
                                         Class<? extends Annotation> clazz)

Creates an AnnotationMirror given by a particular annotation class.

Parameters:

elements - the element utilities to use

clazz - the annotation class

Returns:

an AnnotationMirror of type given type

annotationName

public static final @Interned String annotationName(AnnotationMirror annotation)

Returns:

the fully-qualified name of an annotation as a Name

areSame

public static boolean areSame(@Nullable AnnotationMirror a1,
                              @Nullable AnnotationMirror a2)

Checks if both annotations are the same. Returns true iff both annotations are of the same type and have the same annotation values. This behavior differs from AnnotationMirror.equals(Object). The equals method returns true iff both annotations are the same and annotate the same annotation target (e.g. field, variable, etc).

Returns:

true iff a1 and a2 are the same annotation

areSameIgnoringValues

public static boolean areSameIgnoringValues(AnnotationMirror a1,
                                            AnnotationMirror a2)

Returns:

true iff a1 and a2 have the same annotation type

See Also:

areSame(AnnotationMirror, AnnotationMirror)

areSameByName

public static boolean areSameByName(AnnotationMirror am,
                                    @Interned String aname)

Checks that the annotation am has the name aname. Values are ignored.

areSameByClass

public static boolean areSameByClass(AnnotationMirror am,
                                     Class<? extends Annotation> anno)

Checks that the annotation am has the name of anno. Values are ignored.

areSame

public static boolean areSame(Collection<? extends AnnotationMirror> c1,
                              Collection<? extends AnnotationMirror> c2)

Checks that two collections contain the same annotations.

Returns:

true iff c1 and c2 contain the same annotations

containsSame

public static boolean containsSame(Collection<? extends AnnotationMirror> c,
                                   AnnotationMirror anno)

Checks that the collection contains the annotation. Using Collection.contains does not always work, because it does not use areSame for comparison.

Returns:

true iff c contains anno, according to areSame.

containsSameByClass

public static boolean containsSameByClass(Collection<? extends AnnotationMirror> c,
                                          Class<? extends Annotation> anno)

Checks that the collection contains the annotation. Using Collection.contains does not always work, because it does not use areSame for comparison.

Returns:

true iff c contains anno, according to areSameByClass.

containsSameIgnoringValues

public static boolean containsSameIgnoringValues(Collection<? extends AnnotationMirror> c,
                                                 AnnotationMirror anno)

Checks that the collection contains the annotation ignoring values. Using Collection.contains does not always work, because it does not use areSameIgnoringValues for comparison.

Returns:

true iff c contains anno, according to areSameIgnoringValues.

annotationOrdering

public static Comparator<AnnotationMirror> annotationOrdering()

provide ordering for AnnotationMirror based on their fully qualified name. The ordering ignores annotation values when ordering. The ordering is meant to be used as TreeSet or TreeMap ordering. A Set should not contain two annotations that only differ in values.

createAnnotationMap

public static <V> Map<AnnotationMirror,V> createAnnotationMap()

Create a map suitable for storing AnnotationMirror as keys. It can store one instance of AnnotationMirror of a given declared type, regardless of the annotation element values.

Type Parameters:

V - the value of the map

Returns:

a new map with AnnotationMirror as key

createAnnotationSet

public static Set<AnnotationMirror> createAnnotationSet()

Constructs a Set suitable for storing AnnotationMirrors. It stores at most once instance of AnnotationMirror of a given type, regardless of the annotation element values.

Returns:

a new set to store AnnotationMirror as element

hasInheritedMeta

public static boolean hasInheritedMeta(AnnotationMirror anno)

Returns true if the given annotation has a @Inherited meta-annotation.

getElementValuesWithDefaults

public static Map<? extends ExecutableElement,? extends AnnotationValue> getElementValuesWithDefaults(AnnotationMirror ad)

Returns the values of an annotation's attributes, including defaults. The method with the same name in JavacElements cannot be used directly, because it includes a cast to Attribute.Compound, which doesn't hold for annotations generated by the Checker Framework.

Parameters:

ad - annotation to examine

Returns:

the values of the annotation's elements, including defaults

See Also:

AnnotationMirror.getElementValues(), JavacElements.getElementValuesWithDefaults(AnnotationMirror)

hasElementValue

public static <T> boolean hasElementValue(AnnotationMirror anno,
                                          CharSequence name)

Verify whether the attribute with the name name exists in the annotation anno.

Parameters:

anno - the annotation to examine

name - the name of the attribute

Returns:

whether the attribute exists in anno

getElementValue

public static <T> T getElementValue(AnnotationMirror anno,
                                    CharSequence name,
                                    Class<T> expectedType,
                                    boolean useDefaults)

Get the attribute with the name name of the annotation anno. The result is expected to have type expectedType.

Note 1: The method does not work well for attributes of an array type (as it would return a list of AnnotationValues). Use getElementValueArray instead.

Note 2: The method does not work for attributes of an enum type, as the AnnotationValue is a VarSymbol and would be cast to the enum type, which doesn't work. Use getElementValueEnum instead.

Parameters:

anno - the annotation to disassemble

name - the name of the attribute to access

expectedType - the expected type used to cast the return type

useDefaults - whether to apply default values to the attribute.

Returns:

the value of the attribute with the given name

getElementValueEnum

public static <T extends Enum<T>> T getElementValueEnum(AnnotationMirror anno,
                                                        CharSequence name,
                                                        Class<T> t,
                                                        boolean useDefaults)

Version that is suitable for Enum elements.

getElementValueArray

public static <T> List<T> getElementValueArray(AnnotationMirror anno,
                                               CharSequence name,
                                               Class<T> expectedType,
                                               boolean useDefaults)

Get the attribute with the name name of the annotation anno, where the attribute has an array type. One element of the result is expected to have type expectedType. Parameter useDefaults is used to determine whether default values should be used for annotation values. Finding defaults requires more computation, so should be false when no defaulting is needed.

Parameters:

anno - the annotation to disassemble

name - the name of the attribute to access

expectedType - the expected type used to cast the return type

useDefaults - whether to apply default values to the attribute.

Returns:

the value of the attribute with the given name

getElementValueEnumArray

public static <T extends Enum<T>> List<T> getElementValueEnumArray(AnnotationMirror anno,
                                                                   CharSequence name,
                                                                   Class<T> t,
                                                                   boolean useDefaults)

Get the attribute with the name name of the annotation anno, or the default value if no attribute is present explicitly, where the attribute has an array type and the elements are Enums. One element of the result is expected to have type expectedType.

getElementValueClassName

public static Name getElementValueClassName(AnnotationMirror anno,
                                            CharSequence name,
                                            boolean useDefaults)

Get the Name of the class that is referenced by attribute 'name'. This is a convenience method for the most common use-case. Like getElementValue(anno, name, ClassType.class).getQualifiedName(), but this method ensures consistent use of the qualified name.

getElementValueClass

public static Class<?> getElementValueClass(AnnotationMirror anno,
                                            CharSequence name,
                                            boolean useDefaults)

Get the Class that is referenced by attribute 'name'. This method uses Class.forName to load the class. It returns null if the class wasn't found.

updateMappingToImmutableSet

public static <T> void updateMappingToImmutableSet(Map<T,Set<AnnotationMirror>> map,
                                                   T key,
                                                   Set<AnnotationMirror> newQual)

See checkers.types.QualifierHierarchy#updateMappingToMutableSet(QualifierHierarchy, Map, Object, AnnotationMirror) (Not linked because it is in an independent project.