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273 lines
7.7 KiB
273 lines
7.7 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.util;
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import java.util.List;
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import javax.lang.model.element.*;
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import javax.lang.model.type.TypeMirror;
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import static javax.lang.model.SourceVersion.*;
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import javax.lang.model.SourceVersion;
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import javax.annotation.processing.SupportedSourceVersion;
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/**
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* A simple visitor for annotation values with default behavior
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* appropriate for the {@link SourceVersion#RELEASE_6 RELEASE_6}
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* source version. Visit methods call {@link
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* #defaultAction} passing their arguments to {@code defaultAction}'s
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* corresponding parameters.
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*
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* <p> Methods in this class may be overridden subject to their
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* general contract. Note that annotating methods in concrete
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* subclasses with {@link java.lang.Override @Override} will help
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* ensure that methods are overridden as intended.
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*
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* <p> <b>WARNING:</b> The {@code AnnotationValueVisitor} interface
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* implemented by this class may have methods added to it in the
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* future to accommodate new, currently unknown, language structures
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* added to future versions of the Java™ programming language.
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* Therefore, methods whose names begin with {@code "visit"} may be
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* added to this class in the future; to avoid incompatibilities,
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* classes which extend this class should not declare any instance
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* methods with names beginning with {@code "visit"}.
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*
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* <p>When such a new visit method is added, the default
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* implementation in this class will be to call the {@link
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* #visitUnknown visitUnknown} method. A new simple annotation
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* value visitor class will also be introduced to correspond to the
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* new language level; this visitor will have different default
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* behavior for the visit method in question. When the new visitor is
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* introduced, all or portions of this visitor may be deprecated.
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*
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* <p>Note that adding a default implementation of a new visit method
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* in a visitor class will occur instead of adding a <em>default
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* method</em> directly in the visitor interface since a Java SE 8
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* language feature cannot be used to this version of the API since
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* this version is required to be runnable on Java SE 7
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* implementations. Future versions of the API that are only required
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* to run on Java SE 8 and later may take advantage of default methods
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* in this situation.
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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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*
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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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*
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* @see SimpleAnnotationValueVisitor7
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* @see SimpleAnnotationValueVisitor8
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* @since 1.6
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*/
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@SupportedSourceVersion(RELEASE_6)
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public class SimpleAnnotationValueVisitor6<R, P>
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extends AbstractAnnotationValueVisitor6<R, P> {
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/**
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* Default value to be returned; {@link #defaultAction
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* defaultAction} returns this value unless the method is
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* overridden.
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*/
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protected final R DEFAULT_VALUE;
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/**
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* Constructor for concrete subclasses; uses {@code null} for the
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* default value.
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*/
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protected SimpleAnnotationValueVisitor6() {
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super();
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DEFAULT_VALUE = null;
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}
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/**
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* Constructor for concrete subclasses; uses the argument for the
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* default value.
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*
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* @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
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*/
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protected SimpleAnnotationValueVisitor6(R defaultValue) {
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super();
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DEFAULT_VALUE = defaultValue;
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}
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/**
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* The default action for visit methods. The implementation in
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* this class just returns {@link #DEFAULT_VALUE}; subclasses will
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* commonly override this method.
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*
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* @param o the value of the annotation
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* @param p a visitor-specified parameter
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* @return {@code DEFAULT_VALUE} unless overridden
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*/
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protected R defaultAction(Object o, P p) {
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return DEFAULT_VALUE;
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param b {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitBoolean(boolean b, P p) {
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return defaultAction(b, p);
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param b {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitByte(byte b, P p) {
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return defaultAction(b, p);
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param c {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitChar(char c, P p) {
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return defaultAction(c, p);
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param d {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitDouble(double d, P p) {
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return defaultAction(d, p);
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param f {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitFloat(float f, P p) {
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return defaultAction(f, p);
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param i {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitInt(int i, P p) {
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return defaultAction(i, p);
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param i {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitLong(long i, P p) {
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return defaultAction(i, p);
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param s {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitShort(short s, P p) {
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return defaultAction(s, p);
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param s {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitString(String s, P p) {
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return defaultAction(s, p);
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param t {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitType(TypeMirror t, P p) {
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return defaultAction(t, p);
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param c {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitEnumConstant(VariableElement c, P p) {
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return defaultAction(c, p);
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param a {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitAnnotation(AnnotationMirror a, P p) {
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return defaultAction(a, p);
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}
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/**
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* {@inheritDoc} This implementation calls {@code defaultAction}.
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*
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* @param vals {@inheritDoc}
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* @param p {@inheritDoc}
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* @return the result of {@code defaultAction}
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*/
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public R visitArray(List<? extends AnnotationValue> vals, P p) {
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return defaultAction(vals, p);
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}
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}
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