org.checkerframework.framework.util.element

Class SuperTypeApplier

java.lang.Object

org.checkerframework.framework.util.element.SuperTypeApplier

public class SuperTypeApplier
extends Object

When discovering supertypes of an AnnotatedTypeMirror we want to annotate each supertype with the annotations of the subtypes class declaration. This class provides static methods to do this for a list of supertypes. An instance of this class handles ONE supertype.

Field Summary

Fields

Modifier and Type	Field and Description
protected Element	element An Element that type represents.
protected AnnotatedTypeMirror	type The type to which we wish to apply annotations.

Method Summary

Modifier and Type	Method and Description
protected com.sun.tools.javac.code.TargetType[]	annotatedTargets()
static void	annotateSupers(List<AnnotatedTypeMirror.AnnotatedDeclaredType> supertypes, TypeElement subtypeElement) Annotates each supertype with annotations from subtypeElement's extends/implements clauses.
void	extractAndApply() Reads the list of annotations that apply to this element (see getRawTypeAttributes).
int	getElementIndex() The index of element in the list of elements that contains it.
protected Iterable<com.sun.tools.javac.code.Attribute.TypeCompound>	getRawTypeAttributes() Annotations on elements are represented as Attribute.TypeCompounds ( a subtype of AnnotationMirror) that are usually accessed through a getRawTypeAttributes method on the element.
int	getTypeCompoundIndex(com.sun.tools.javac.code.Attribute.TypeCompound anno) A TypeAnnotationPosition has a number of different indexes (type_index, bound_index, param_index) Return the index we are interested in.
protected void	handleInvalid(List<com.sun.tools.javac.code.Attribute.TypeCompound> invalid)
protected void	handleTargeted(List<com.sun.tools.javac.code.Attribute.TypeCompound> targeted) This method should apply all annotations that are handled by this object.
protected void	handleValid(List<com.sun.tools.javac.code.Attribute.TypeCompound> valid) The default implementation of this method does nothing.
protected boolean	isAccepted() Tests element/type fields to ensure that this TargetedElementAnnotationApplier is valid for this element/type pair.
protected Map<org.checkerframework.framework.util.element.TargetedElementAnnotationApplier.TargetClass,List<com.sun.tools.javac.code.Attribute.TypeCompound>>	sift(Iterable<com.sun.tools.javac.code.Attribute.TypeCompound> typeCompounds) Separate the input annotations into a Map of TargetClass (TARGETED, VALID, INVALID) to the annotations that fall into each of those categories.
protected com.sun.tools.javac.code.TargetType[]	validTargets()

Methods inherited from class java.lang.Object

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

Field Detail

type

protected final AnnotatedTypeMirror type

The type to which we wish to apply annotations.

element

protected final Element element

An Element that type represents.

Method Detail

annotateSupers

public static void annotateSupers(List<AnnotatedTypeMirror.AnnotatedDeclaredType> supertypes,
                                  TypeElement subtypeElement)

Annotates each supertype with annotations from subtypeElement's extends/implements clauses.

Parameters:

supertypes - supertypes to annotate

subtypeElement - element that may have annotations to apply to supertypes

getElementIndex

public int getElementIndex()

The index of element in the list of elements that contains it.

Returns:

the type_index that should represent supertype

getTypeCompoundIndex

public int getTypeCompoundIndex(com.sun.tools.javac.code.Attribute.TypeCompound anno)

A TypeAnnotationPosition has a number of different indexes (type_index, bound_index, param_index) Return the index we are interested in. If offsetting needs to be done it should be done in getElementIndex not here. (see ElementAnnotationUtils.getBoundIndexOffset )

Parameters:

anno - an annotation we might wish to apply

Returns:

the type_index of anno's TypeAnnotationPosition

annotatedTargets

protected com.sun.tools.javac.code.TargetType[] annotatedTargets()

Returns:

TargetType.CLASS_EXTENDS

validTargets

protected com.sun.tools.javac.code.TargetType[] validTargets()

Returns:

TargetType.CLASS_TYPE_PARAMETER, TargetType.CLASS_TYPE_PARAMETER_BOUND

getRawTypeAttributes

protected Iterable<com.sun.tools.javac.code.Attribute.TypeCompound> getRawTypeAttributes()

Annotations on elements are represented as Attribute.TypeCompounds ( a subtype of AnnotationMirror) that are usually accessed through a getRawTypeAttributes method on the element.

In Java 8 and later these annotations are generally contained by elements to which they apply. However, in earlier versions of Java many of these annotations are handled by either the enclosing method, e.g. parameters and method type parameters, or enclosing class, e.g. class type parameters. Therefore, many annotations are addressed by first getting all annotations on a method or class and the picking out only the ones we wish to target (see extractAndApply).

Returns:

the TypeCompounds (annotations) of the subclass

handleTargeted

protected void handleTargeted(List<com.sun.tools.javac.code.Attribute.TypeCompound> targeted)

This method should apply all annotations that are handled by this object.

Parameters:

targeted - the list of annotations that were returned by getRawTypeAttributes and had a TargetType contained by annotatedTargets

isAccepted

protected boolean isAccepted()

Tests element/type fields to ensure that this TargetedElementAnnotationApplier is valid for this element/type pair.

Returns:

true if the type/element members are handled by this class false otherwise

sift

protected Map<org.checkerframework.framework.util.element.TargetedElementAnnotationApplier.TargetClass,List<com.sun.tools.javac.code.Attribute.TypeCompound>> sift(Iterable<com.sun.tools.javac.code.Attribute.TypeCompound> typeCompounds)

Separate the input annotations into a Map of TargetClass (TARGETED, VALID, INVALID) to the annotations that fall into each of those categories.

Parameters:

typeCompounds - annotations to sift through, should be those returned by getRawTypeAttributes

Returns:

a Map<TargetClass &rArr; Annotations>.

handleValid

protected void handleValid(List<com.sun.tools.javac.code.Attribute.TypeCompound> valid)

The default implementation of this method does nothing.

Parameters:

valid - the list of annotations that were returned by getRawTypeAttributes and had a TargetType contained by valid and NOT annotatedTargets

handleInvalid

protected void handleInvalid(List<com.sun.tools.javac.code.Attribute.TypeCompound> invalid)

Parameters:

invalid - the list of annotations that were returned by getRawTypeAttributes and were not handled by handleTargeted or handleValid

extractAndApply

public void extractAndApply()

Reads the list of annotations that apply to this element (see getRawTypeAttributes). Sifts them into three groups (TARGETED, INVALID, VALID) and then calls the appropriate handle method on them. The handleTargeted method should apply all annotations that are handled by this object.

This method will throw a runtime exception if isAccepted returns false.