com.puppycrawl.tools.checkstyle.utils

Class AnnotationUtil

java.lang.Object

com.puppycrawl.tools.checkstyle.utils.AnnotationUtil

public final class AnnotationUtil
extends java.lang.Object

Contains utility methods designed to work with annotations.

Field Summary

Fields

Modifier and Type	Field and Description
private static java.lang.String	THE_AST_IS_NULL Common message.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	AnnotationUtil() Private utility constructor.

Method Summary

Modifier and Type	Method and Description
static boolean	containsAnnotation(DetailAST ast) Checks if the AST is annotated with any annotation.
static boolean	containsAnnotation(DetailAST ast, java.util.List<java.lang.String> annotations) Checks if the given AST element is annotated with any of the specified annotations.
static boolean	containsAnnotation(DetailAST ast, java.lang.String annotation) Checks if the AST is annotated with the passed in annotation.
private static DetailAST	findFirstAnnotation(DetailAST ast, java.util.function.Predicate<DetailAST> predicate) Checks if the given AST is annotated with at least one annotation that matches the given predicate and returns the AST representing the first matching annotation.
static DetailAST	getAnnotation(DetailAST ast, java.lang.String annotation) Checks if the AST is annotated with the passed in annotation and returns the AST representing that annotation.
static DetailAST	getAnnotationHolder(DetailAST ast) Gets the AST that holds a series of annotations for the potentially annotated AST.

Methods inherited from class java.lang.Object

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

Field Detail

THE_AST_IS_NULL

private static final java.lang.String THE_AST_IS_NULL

Common message.

See Also:

Constant Field Values

Constructor Detail

AnnotationUtil

private AnnotationUtil()

Private utility constructor.

Throws:

java.lang.UnsupportedOperationException - if called

Method Detail

containsAnnotation

public static boolean containsAnnotation(DetailAST ast,
                                         java.lang.String annotation)

Checks if the AST is annotated with the passed in annotation.

This method will not look for imports or package statements to detect the passed in annotation.

To check if an AST contains a passed in annotation taking into account fully-qualified names (ex: java.lang.Override, Override) this method will need to be called twice. Once for each name given.

Parameters:

ast - the current node

annotation - the annotation name to check for

Returns:

true if contains the annotation

containsAnnotation

public static boolean containsAnnotation(DetailAST ast)

Checks if the AST is annotated with any annotation.

Parameters:

ast - the current node

Returns:

true if the AST contains at least one annotation

Throws:

java.lang.IllegalArgumentException - when ast is null

containsAnnotation

public static boolean containsAnnotation(DetailAST ast,
                                         java.util.List<java.lang.String> annotations)

Checks if the given AST element is annotated with any of the specified annotations.

This method accepts both simple and fully-qualified names, e.g. "Override" will match both java.lang.Override and Override.

Parameters:

ast - The type or method definition.

annotations - A collection of annotations to look for.

Returns:

true if the given AST element is annotated with at least one of the specified annotations; false otherwise.

Throws:

java.lang.IllegalArgumentException - when ast or annotations are null

getAnnotationHolder

public static DetailAST getAnnotationHolder(DetailAST ast)

Gets the AST that holds a series of annotations for the potentially annotated AST. Returns null if the passed in AST does not have an Annotation Holder.

Parameters:

ast - the current node

Returns:

the Annotation Holder

Throws:

java.lang.IllegalArgumentException - when ast is null

getAnnotation

public static DetailAST getAnnotation(DetailAST ast,
                                      java.lang.String annotation)

Checks if the AST is annotated with the passed in annotation and returns the AST representing that annotation.

This method will not look for imports or package statements to detect the passed in annotation.

To check if an AST contains a passed in annotation taking into account fully-qualified names (ex: java.lang.Override, Override) this method will need to be called twice. Once for each name given.

Parameters:

ast - the current node

annotation - the annotation name to check for

Returns:

the AST representing that annotation

Throws:

java.lang.IllegalArgumentException - when ast or annotations are null; when annotation is blank

findFirstAnnotation

private static DetailAST findFirstAnnotation(DetailAST ast,
                                             java.util.function.Predicate<DetailAST> predicate)

Checks if the given AST is annotated with at least one annotation that matches the given predicate and returns the AST representing the first matching annotation.

This method will not look for imports or package statements to detect the passed in annotation.

Parameters:

ast - the current node

predicate - The predicate which decides if an annotation matches

Returns:

the AST representing that annotation