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215 lines
6.7 KiB
215 lines
6.7 KiB
/*
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* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.lang.model.element;
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import java.util.List;
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import javax.lang.model.type.TypeMirror;
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/**
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* A visitor of the values of annotation type elements, using a
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* variant of the visitor design pattern. Unlike a standard visitor
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* which dispatches based on the concrete type of a member of a type
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* hierarchy, this visitor dispatches based on the type of data
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* stored; there are no distinct subclasses for storing, for example,
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* {@code boolean} values versus {@code int} values. Classes
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* implementing this interface are used to operate on a value when the
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* type of that value is unknown at compile time. When a visitor is
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* passed to a value's {@link AnnotationValue#accept accept} method,
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* the <tt>visit<i>XYZ</i></tt> method applicable to that value is
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* invoked.
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*
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* <p> Classes implementing this interface may or may not throw a
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* {@code NullPointerException} if the additional parameter {@code p}
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* is {@code null}; see documentation of the implementing class for
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* details.
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*
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* <p> <b>WARNING:</b> It is possible that methods will be added to
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* this interface to accommodate new, currently unknown, language
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* structures added to future versions of the Java™ programming
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* language. Therefore, visitor classes directly implementing this
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* interface may be source incompatible with future versions of the
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* platform. To avoid this source incompatibility, visitor
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* implementations are encouraged to instead extend the appropriate
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* abstract visitor class that implements this interface. However, an
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* API should generally use this visitor interface as the type for
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* parameters, return type, etc. rather than one of the abstract
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* classes.
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*
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* <p>Note that methods to accommodate new language constructs could
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* be added in a source <em>compatible</em> way if they were added as
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* <em>default methods</em>. However, default methods are only
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* available on Java SE 8 and higher releases and the {@code
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* javax.lang.model.*} packages bundled in Java SE 8 are required to
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* also be runnable on Java SE 7. Therefore, default methods
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* <em>cannot</em> be used when extending {@code javax.lang.model.*}
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* to cover Java SE 8 language features. However, default methods may
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* be used in subsequent revisions of the {@code javax.lang.model.*}
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* packages that are only required to run on Java SE 8 and higher
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* platform versions.
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*
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* @param <R> the return type of this visitor's methods
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* @param <P> the type of the additional parameter to this visitor's methods.
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* @author Joseph D. Darcy
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* @author Scott Seligman
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* @author Peter von der Ahé
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* @since 1.6
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*/
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public interface AnnotationValueVisitor<R, P> {
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/**
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* Visits an annotation value.
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* @param av the value to visit
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* @param p a visitor-specified parameter
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* @return a visitor-specified result
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*/
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R visit(AnnotationValue av, P p);
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/**
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* A convenience method equivalent to {@code v.visit(av, null)}.
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* @param av the value to visit
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* @return a visitor-specified result
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*/
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R visit(AnnotationValue av);
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/**
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* Visits a {@code boolean} value in an annotation.
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* @param b the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitBoolean(boolean b, P p);
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/**
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* Visits a {@code byte} value in an annotation.
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* @param b the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitByte(byte b, P p);
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/**
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* Visits a {@code char} value in an annotation.
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* @param c the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitChar(char c, P p);
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/**
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* Visits a {@code double} value in an annotation.
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* @param d the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitDouble(double d, P p);
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/**
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* Visits a {@code float} value in an annotation.
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* @param f the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitFloat(float f, P p);
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/**
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* Visits an {@code int} value in an annotation.
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* @param i the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitInt(int i, P p);
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/**
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* Visits a {@code long} value in an annotation.
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* @param i the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitLong(long i, P p);
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/**
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* Visits a {@code short} value in an annotation.
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* @param s the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitShort(short s, P p);
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/**
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* Visits a string value in an annotation.
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* @param s the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitString(String s, P p);
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/**
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* Visits a type value in an annotation.
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* @param t the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitType(TypeMirror t, P p);
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/**
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* Visits an {@code enum} value in an annotation.
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* @param c the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitEnumConstant(VariableElement c, P p);
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/**
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* Visits an annotation value in an annotation.
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* @param a the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitAnnotation(AnnotationMirror a, P p);
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/**
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* Visits an array value in an annotation.
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* @param vals the value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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*/
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R visitArray(List<? extends AnnotationValue> vals, P p);
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/**
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* Visits an unknown kind of annotation value.
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* This can occur if the language evolves and new kinds
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* of value can be stored in an annotation.
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* @param av the unknown value being visited
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* @param p a visitor-specified parameter
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* @return the result of the visit
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* @throws UnknownAnnotationValueException
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* a visitor implementation may optionally throw this exception
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*/
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R visitUnknown(AnnotationValue av, P p);
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}
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