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package javax.lang.model.util;

import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.ModuleElement;
import static javax.lang.model.SourceVersion.*;


A skeletal visitor of program elements with default behavior appropriate for the RELEASE_9 source version.

WARNING: The ElementVisitor interface implemented by this class may have methods added to it in the future to accommodate new, currently unknown, language structures added to future versions of the Java™ programming language. Therefore, methods whose names begin with "visit" may be added to this class in the future; to avoid incompatibilities, classes which extend this class should not declare any instance methods with names beginning with "visit".

When such a new visit method is added, the default implementation in this class will be to call the visitUnknown method. A new abstract element visitor class will also be introduced to correspond to the new language level; this visitor will have different default behavior for the visit method in question. When the new visitor is introduced, all or portions of this visitor may be deprecated.

Type parameters:
  • <R> – the return type of this visitor's methods. Use Void for visitors that do not need to return results.
  • <P> – the type of the additional parameter to this visitor's methods. Use Void for visitors that do not need an additional parameter.
See Also:
Since:9
@specJPMS
/** * A skeletal visitor of program elements with default behavior * appropriate for the {@link SourceVersion#RELEASE_9 RELEASE_9} * source version. * * <p> <b>WARNING:</b> The {@code ElementVisitor} interface * implemented by this class may have methods added to it in the * future to accommodate new, currently unknown, language structures * added to future versions of the Java&trade; programming language. * Therefore, methods whose names begin with {@code "visit"} may be * added to this class in the future; to avoid incompatibilities, * classes which extend this class should not declare any instance * methods with names beginning with {@code "visit"}. * * <p>When such a new visit method is added, the default * implementation in this class will be to call the {@link * #visitUnknown visitUnknown} method. A new abstract element visitor * class will also be introduced to correspond to the new language * level; this visitor will have different default behavior for the * visit method in question. When the new visitor is introduced, all * or portions of this visitor may be deprecated. * * @param <R> the return type of this visitor's methods. Use {@link * Void} for visitors that do not need to return results. * @param <P> the type of the additional parameter to this visitor's * methods. Use {@code Void} for visitors that do not need an * additional parameter. * * @see AbstractElementVisitor6 * @see AbstractElementVisitor7 * @see AbstractElementVisitor8 * @since 9 * @spec JPMS */
@SupportedSourceVersion(RELEASE_9) public abstract class AbstractElementVisitor9<R, P> extends AbstractElementVisitor8<R, P> {
Constructor for concrete subclasses to call.
/** * Constructor for concrete subclasses to call. */
protected AbstractElementVisitor9(){ super(); }
Visits a ModuleElement in a manner defined by a subclass.
Params:
  • t – {@inheritDoc}
  • p – {@inheritDoc}
Returns:the result of the visit as defined by a subclass
/** * Visits a {@code ModuleElement} in a manner defined by a * subclass. * * @param t {@inheritDoc} * @param p {@inheritDoc} * @return the result of the visit as defined by a subclass */
@Override public abstract R visitModule(ModuleElement t, P p); }