checkers.source
Class SourceChecker

java.lang.Object
  javax.annotation.processing.AbstractProcessor
      com.sun.source.util.AbstractTypeProcessor
          checkers.source.SourceChecker

All Implemented Interfaces:

Processor

Direct Known Subclasses:

BaseTypeChecker, FactoryTestChecker, Locations, TypeOutputtingChecker

public abstract class SourceChecker
extends AbstractTypeProcessor

An abstract annotation processor designed for implementing a source-file checker for a JSR-308 conforming compiler plug-in. It provides an interface to javac's annotation processing API, routines for error reporting via the JSR 199 compiler API, and an implementation for using a SourceVisitor to perform the type-checking.

Subclasses must implement the following methods:

• getMessages() (for type-qualifier specific error messages)
• createSourceVisitor(CompilationUnitTree) (for a custom SourceVisitor)
• createFactory(com.sun.source.tree.CompilationUnitTree) (for a custom AnnotatedTypeFactory)
• getSuppressWarningsKey() (for honoring SuppressWarnings annotations)

Most type-checker plug-ins will want to extend BaseTypeChecker, instead of this class. Only checkers which require annotated types but not subtype checking (e.g. for testing purposes) should extend this. Non-type checkers (e.g. for enforcing coding styles) should extend AbstractProcessor (or even this class) as the Checker Framework is not designed for such checkers.

Field Summary

Modifier and Type	Field and Description
TreePath	currentPath
protected CompilationUnitTree	currentRoot The source tree that's being scanned.
protected ProcessingEnvironment	env Provides access to compiler helpers/internals.
protected com.sun.tools.javac.processing.JavacMessager	messager Used to report error messages and warnings via the compiler.
protected Properties	messages Maps error keys to localized/custom error messages.
protected Trees	trees Used as a helper for the SourceVisitor.

Fields inherited from class javax.annotation.processing.AbstractProcessor

processingEnv

Constructor and Description

SourceChecker()

Method Summary

Modifier and Type	Method and Description
AnnotatedTypeFactory	createFactory(CompilationUnitTree root)
protected abstract SourceVisitor<?,?>	createSourceVisitor(CompilationUnitTree root) Provides the SourceVisitor that the checker should use to scan input source trees.
boolean	getLintOption(String name) Determines the value of the lint option with the given name.
boolean	getLintOption(String name, boolean def) Determines the value of the lint option with the given name.
Properties	getMessages() Provides a mapping of error keys to custom error messages.
ProcessingEnvironment	getProcessingEnvironment()
Pattern	getShouldSkip() Returns a regular expression pattern to specify java classes that are not annotated, and thus whose warnings and should be surpressed.
Set<String>	getSupportedAnnotationTypes() Always returns a singleton set containing only "*".
Set<String>	getSupportedLintOptions() Returns the lint options recognized by this checker.
Set<String>	getSupportedOptions()
SourceVersion	getSupportedSourceVersion()
Collection<String>	getSuppressWarningsKey()
void	init(ProcessingEnvironment processingEnv)
protected void	message(Diagnostic.Kind kind, Object source, Object msgKey, Object... args) Prints a message (error, warning, note, etc.) via JSR-269.
void	report(Result r, Object src) Reports a result.
void	typeProcess(TypeElement e, TreePath p) Type-check the code with Java specifications and then runs the Checker Rule Checking visitor on the processed source.

Methods inherited from class com.sun.source.util.AbstractTypeProcessor

process, typeProcessingOver

Methods inherited from class javax.annotation.processing.AbstractProcessor

getCompletions, isInitialized

Methods inherited from class java.lang.Object

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

Field Detail

env

protected ProcessingEnvironment env

Provides access to compiler helpers/internals.

messages

protected Properties messages

Maps error keys to localized/custom error messages.

messager

protected com.sun.tools.javac.processing.JavacMessager messager

Used to report error messages and warnings via the compiler.

trees

protected Trees trees

Used as a helper for the SourceVisitor.

currentRoot

protected CompilationUnitTree currentRoot

The source tree that's being scanned.

currentPath

public TreePath currentPath

Constructor Detail

SourceChecker

public SourceChecker()

Method Detail

getProcessingEnvironment

public ProcessingEnvironment getProcessingEnvironment()

Returns:

the ProcessingEnvironment that was supplied to this checker

createFactory

public AnnotatedTypeFactory createFactory(CompilationUnitTree root)

Parameters:

root - the AST root for the factory

Returns:

an AnnotatedTypeFactory for use by typecheckers

createSourceVisitor

protected abstract SourceVisitor<?,?> createSourceVisitor(CompilationUnitTree root)

Provides the SourceVisitor that the checker should use to scan input source trees.

Parameters:

root - the AST root

Returns:

a SourceVisitor to use to scan source trees

getMessages

public Properties getMessages()

Provides a mapping of error keys to custom error messages. As a default, this implementation builds a Properties out of file messages.properties. It accumulates all the properties files in the Java class hierarchy from the checker up to SourceChecker. This permits subclasses to inherit default messages while being able to override them.

Returns:

a Properties that maps error keys to error message text

init

public void init(ProcessingEnvironment processingEnv)

Specified by:

init in interface Processor

Overrides:

init in class AbstractTypeProcessor

See Also:

AbstractProcessor.init(ProcessingEnvironment)

typeProcess

public void typeProcess(TypeElement e,
                        TreePath p)

Type-check the code with Java specifications and then runs the Checker Rule Checking visitor on the processed source.

Specified by:

typeProcess in class AbstractTypeProcessor

See Also:

Processor.process(Set, RoundEnvironment)

message

protected void message(Diagnostic.Kind kind,
                       Object source,
                       Object msgKey,
                       Object... args)

Prints a message (error, warning, note, etc.) via JSR-269.

Parameters:

kind - the type of message to print

source - the object from which to obtain source position information

msgKey - the message key to print

args - arguments for interpolation in the string corresponding to the given message key

Throws:

IllegalArgumentException - if source is neither a Tree nor an Element

See Also:

Diagnostic

report

public void report(Result r,
                   Object src)

Reports a result. By default, it prints it to the screen via the compiler's internal messeger if the result is non-success; otherwise, the method returns with no side-effects.

Parameters:

r - the result to report

src - the position object associated with the result

getLintOption

public final boolean getLintOption(String name)

Determines the value of the lint option with the given name. Just as javac uses "-Xlint:xxx" to enable and "-Xlint:-xxx" to disable option xxx, annotation-related lint options are enabled with "-Alint:xxx" and disabled with "-Alint:-xxx".

Parameters:

name - the name of the lint option to check for

Returns:

true if the lint option was given, false if it was not given or was given prepended with a "-"

Throws:

IllegalArgumentException - if the option name is not recognized via the SupportedLintOptions annotation or the getSupportedLintOptions() method

See Also:

getLintOption(String,boolean)

getLintOption

public final boolean getLintOption(String name,
                                   boolean def)

Determines the value of the lint option with the given name. Just as javac uses "-Xlint:xxx" to enable and "-Xlint:-xxx" to disable option xxx, annotation-related lint options are enabled with "-Alint=xxx" and disabled with "-Alint=-xxx".

Parameters:

name - the name of the lint option to check for

def - the default option value, returned if the option was not given

Returns:

true if the lint option was given, false if it was given prepended with a "-", or def if it was not given at all

Throws:

IllegalArgumentException - if the option name is not recognized via the SupportedLintOptions annotation or the getSupportedLintOptions() method

See Also:

getLintOption(String)

getSupportedLintOptions

public Set<String> getSupportedLintOptions()

Returns the lint options recognized by this checker. Lint options are those which can be checked for via getLintOption(java.lang.String).

Returns:

an unmodifiable Set of the lint options recognized by this checker

getSupportedOptions

public Set<String> getSupportedOptions()

Specified by:

getSupportedOptions in interface Processor

Overrides:

getSupportedOptions in class AbstractProcessor

getSupportedAnnotationTypes

public final Set<String> getSupportedAnnotationTypes()

Always returns a singleton set containing only "*". This method returns the argument to the SupportedAnnotationTypes annotation, so the effect of returning "*" is as if the checker were annotated by @SupportedAnnotationTypes("*"): javac runs the checker on every class mentioned on the javac command line. This method also checks that subclasses do not contain a SupportedAnnotationTypes annotation.

To specify the annotations that a checker recognizes as type qualifiers, use the TypeQualifiers annotation on the declaration of subclasses of this class or override the BaseTypeChecker.getSupportedTypeQualifiers() method.

Specified by:

getSupportedAnnotationTypes in interface Processor

Overrides:

getSupportedAnnotationTypes in class AbstractProcessor

Throws:

Error - if a subclass is annotated with SupportedAnnotationTypes

See Also:

TypeQualifiers, getSupportedAnnotationTypes()

getSuppressWarningsKey

public Collection<String> getSuppressWarningsKey()

Returns:

String keys that a checker honors for suppressing warnings and errors that it issues

See Also:

SuppressWarningsKey

getShouldSkip

public Pattern getShouldSkip()

Returns a regular expression pattern to specify java classes that are not annotated, and thus whose warnings and should be surpressed. It returns the pattern specified by the user, through the option checkers.skipClasses; otherwise it returns a pattern that can match no class.

Returns:

pattern of un-annotated classes that should be skipped

getSupportedSourceVersion

public SourceVersion getSupportedSourceVersion()

Specified by:

getSupportedSourceVersion in interface Processor

Overrides:

getSupportedSourceVersion in class AbstractProcessor