Class AbstractProcessor

All Implemented Interfaces:
Processor

public abstract class AbstractProcessor
extends Object
implements Processor

An abstract annotation processor designed to be a convenient superclass for most concrete annotation processors. This class examines annotation values to compute the options, annotation types, and source version supported by its subtypes.

The getter methods may issue warnings about noteworthy conditions using the facilities available after the processor has been initialized.

Subclasses are free to override the implementation and specification of any of the methods in this class as long as the general Processor contract for that method is obeyed.

Since:
1.6

Fields

Modifier and Type Field and Description
protected ProcessingEnvironment processingEnv

Processing environment providing by the tool framework.

Constructors

Modifier Constructor and Description
protected AbstractProcessor()

Constructor for subclasses to call.

Methods

Modifier and Type Method and Description
Iterable<? extends Completion> getCompletions(Element element, AnnotationMirror annotation, ExecutableElement member, String userText)

Returns an empty iterable of completions.
Set<String> getSupportedAnnotationTypes()

If the processor class is annotated with SupportedAnnotationTypes, return an unmodifiable set with the same set of strings as the annotation.
Set<String> getSupportedOptions()

If the processor class is annotated with SupportedOptions, return an unmodifiable set with the same set of strings as the annotation.
SourceVersion getSupportedSourceVersion()

If the processor class is annotated with SupportedSourceVersion, return the source version in the annotation.
void init(ProcessingEnvironment processingEnv)

Initializes the processor with the processing environment by setting the processingEnv field to the value of the processingEnv argument.
protected boolean isInitialized()

Returns true if this object has been initialized, false otherwise.
abstract boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv)

Processes a set of annotation types on type elements originating from the prior round and returns whether or not these annotation types are claimed by this processor.

Methods inherited from class java.lang.Object

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

Fields

processingEnv

protected ProcessingEnvironment processingEnv

Processing environment providing by the tool framework.

Constructors

AbstractProcessor

protected AbstractProcessor()

Constructor for subclasses to call.

Methods

getSupportedOptions

public Set<String> getSupportedOptions()

If the processor class is annotated with SupportedOptions, return an unmodifiable set with the same set of strings as the annotation. If the class is not so annotated, an empty set is returned.

Specified by:
getSupportedOptions in interface Processor
Returns:
the options recognized by this processor, or an empty set if none
See Also:
SupportedOptions

getSupportedAnnotationTypes

public Set<String> getSupportedAnnotationTypes()

If the processor class is annotated with SupportedAnnotationTypes, return an unmodifiable set with the same set of strings as the annotation. If the class is not so annotated, an empty set is returned.

Specified by:
getSupportedAnnotationTypes in interface Processor
Returns:
the names of the annotation types supported by this processor, or an empty set if none
See Also:
SupportedAnnotationTypes

getSupportedSourceVersion

public SourceVersion getSupportedSourceVersion()

If the processor class is annotated with SupportedSourceVersion, return the source version in the annotation. If the class is not so annotated, SourceVersion.RELEASE_6 is returned.

Specified by:
getSupportedSourceVersion in interface Processor
Returns:
the latest source version supported by this processor
See Also:
SupportedSourceVersion, ProcessingEnvironment.getSourceVersion()

init

public void init(ProcessingEnvironment processingEnv)

Initializes the processor with the processing environment by setting the processingEnv field to the value of the processingEnv argument. An IllegalStateException will be thrown if this method is called more than once on the same object.

Specified by:
init in interface Processor
Parameters:
processingEnv - environment to access facilities the tool framework provides to the processor
Throws:
IllegalStateException - if this method is called more than once.

process

public abstract boolean process(Set<? extends TypeElement> annotations,
                                RoundEnvironment roundEnv)

Processes a set of annotation types on type elements originating from the prior round and returns whether or not these annotation types are claimed by this processor. If true is returned, the annotation types are claimed and subsequent processors will not be asked to process them; if false is returned, the annotation types are unclaimed and subsequent processors may be asked to process them. A processor may always return the same boolean value or may vary the result based on chosen criteria.

The input set will be empty if the processor supports "*" and the root elements have no annotations. A Processor must gracefully handle an empty set of annotations.

Specified by:
process in interface Processor
Parameters:
annotations - the annotation types requested to be processed
roundEnv - environment for information about the current and prior round
Returns:
whether or not the set of annotation types are claimed by this processor

getCompletions

public Iterable<? extends Completion> getCompletions(Element element,
                                                     AnnotationMirror annotation,
                                                     ExecutableElement member,
                                                     String userText)

Returns an empty iterable of completions.

Specified by:
getCompletions in interface Processor
Parameters:
element - the element being annotated
annotation - the (perhaps partial) annotation being applied to the element
member - the annotation member to return possible completions for
userText - source code text to be completed
Returns:
suggested completions to the annotation

isInitialized

protected boolean isInitialized()

Returns true if this object has been initialized, false otherwise.

Returns:
true if this object has been initialized, false otherwise.

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https://docs.oracle.com/javase/8/docs/api/javax/annotation/processing/AbstractProcessor.html