javax.lang.model.util.AbstractElementVisitor6 Maven / Gradle / Ivy
/*
* Copyright (c) 2005, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javax.lang.model.util;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.*;
import static javax.lang.model.SourceVersion.*;
/**
* A skeletal visitor of program elements with default behavior
* appropriate for the {@link SourceVersion#RELEASE_6 RELEASE_6}
* source version.
*
* @apiNote
* WARNING: 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 programming language. Therefore, methods whose names
* begin with {@code "visit"} may be added to this class in the
* future; to avoid incompatibilities, classes and subclasses which
* extend this class should not declare any instance methods with
* names beginning with {@code "visit"}.
*
* When such a new visit method is added, the default
* implementation in this class will be to directly or indirectly 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 a new visitor is
* introduced, portions of this visitor class may be deprecated,
* including its constructors.
*
* @param the return type of this visitor's methods. Use {@link
* Void} for visitors that do not need to return results.
* @param the type of the additional parameter to this visitor's
* methods. Use {@code Void} for visitors that do not need an
* additional parameter.
*
* @author Joseph D. Darcy
* @author Scott Seligman
* @author Peter von der Ahé
*
* @see AbstractElementVisitor7
* @see AbstractElementVisitor8
* @see AbstractElementVisitor9
* @see AbstractElementVisitor14
* @since 1.6
*/
@SupportedSourceVersion(RELEASE_6)
public abstract class AbstractElementVisitor6 implements ElementVisitor {
/**
* Constructor for concrete subclasses to call.
* @deprecated Release 6 is obsolete; update to a visitor for a newer
* release level.
*/
@Deprecated(/*since="9"*/)
protected AbstractElementVisitor6(){}
/**
* Visits any program element as if by passing itself to that
* element's {@link Element#accept accept} method. The invocation
* {@code v.visit(elem, p)} is equivalent to {@code elem.accept(v,
* p)}.
*
* @param e the element to visit
* @param p a visitor-specified parameter
* @return a visitor-specified result
*/
public final R visit(Element e, P p) {
return e.accept(this, p);
}
/**
* Visits any program element as if by passing itself to that
* element's {@link Element#accept accept} method and passing
* {@code null} for the additional parameter. The invocation
* {@code v.visit(elem)} is equivalent to {@code elem.accept(v,
* null)}.
*
* @param e the element to visit
* @return a visitor-specified result
*/
public final R visit(Element e) {
return e.accept(this, null);
}
/**
* {@inheritDoc}
*
* @implSpec The default implementation of this method in
* {@code AbstractElementVisitor6} will always throw
* {@code new UnknownElementException(e, p)}.
* This behavior is not required of a subclass.
*
* @param e {@inheritDoc}
* @param p {@inheritDoc}
* @return {@inheritDoc}
* @throws UnknownElementException
* a visitor implementation may optionally throw this exception
*/
@Override
public R visitUnknown(Element e, P p) {
throw new UnknownElementException(e, p);
}
/**
* {@inheritDoc}
*
* @implSpec Visits a {@code ModuleElement} by calling {@code
* visitUnknown}.
*
* @param e {@inheritDoc}
* @param p {@inheritDoc}
* @return {@inheritDoc}
*
* @since 9
*/
@Override
public R visitModule(ModuleElement e, P p) {
// Use implementation from interface default method
return ElementVisitor.super.visitModule(e, p);
}
/**
* {@inheritDoc}
*
* @implSpec Visits a {@code RecordComponentElement} by calling {@code
* visitUnknown}.
*
* @param e {@inheritDoc}
* @param p {@inheritDoc}
* @return {@inheritDoc}
*
* @since 14
*/
@SuppressWarnings("preview")
@Override
public R visitRecordComponent(RecordComponentElement e, P p) {
// Use implementation from interface default method
return ElementVisitor.super.visitRecordComponent(e, p);
}
}