content: /*
   * 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
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   */
  
  package jdkx.lang.model.util;
  
  
  import jdkx.lang.model.element.*;
  
  import static jdkx.lang.model.SourceVersion.*;
  import jdkx.lang.model.SourceVersion;
  import jdkx.annotation.processing.SupportedSourceVersion;
  
  /**
   * A skeletal visitor for annotation values with default behavior
   * appropriate for the {@link SourceVersion#RELEASE_6 RELEASE_6}
   * source version.
   *
   * @apiNote
   * <p id=note_for_subclasses><strong>WARNING:</strong> The {@code
   * AnnotationValueVisitor} 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"}.</p>
   *
   * <p>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
   * annotation value 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 <R> the return type of this visitor's methods
   * @param <P> the type of the additional parameter to this visitor's methods.
   *
   * @author Joseph D. Darcy
   * @author Scott Seligman
   * @author Peter von der Ah&eacute;
   *
   * @see AbstractAnnotationValueVisitor7
   * @see AbstractAnnotationValueVisitor8
   * @see AbstractAnnotationValueVisitor9
   * @see AbstractAnnotationValueVisitor14
   * @since 1.6
   */
  @SupportedSourceVersion(RELEASE_6)
  public abstract class AbstractAnnotationValueVisitor6<R, P>
      implements AnnotationValueVisitor<R, P> {
  
      /**
       * Constructor for concrete subclasses to call.
       * @deprecated Release 6 is obsolete; update to a visitor for a newer
       * release level.
       */
      @Deprecated(since="9")
      protected AbstractAnnotationValueVisitor6() {}
  
      /**
       * Visits any annotation value as if by passing itself to that
       * value's {@link AnnotationValue#accept accept}.  The invocation
       * {@code v.visit(av, p)} is equivalent to {@code av.accept(v, p)}.
       * @param av {@inheritDoc}
       * @param p  {@inheritDoc}
       * @return   {@inheritDoc}
       */
      public final R visit(AnnotationValue av, P p) {
          return av.accept(this, p);
      }
  
      /**
       * Visits an annotation value as if by passing itself to that
       * value's {@link AnnotationValue#accept accept} method passing
       * {@code null} for the additional parameter.  The invocation
       * {@code v.visit(av)} is equivalent to {@code av.accept(v,
       * null)}.
       * @param av {@inheritDoc}
       * @return   {@inheritDoc}
       */
      public final R visit(AnnotationValue av) {
          return av.accept(this, null);
      }
  
      /**
       * {@inheritDoc}
       *
       * @implSpec The default implementation of this method in {@code
       * AbstractAnnotationValueVisitor6} will always throw {@code
       * new UnknownAnnotationValueException(av, p)}.  This behavior is not
       * required of a subclass.
       *
       * @param av {@inheritDoc}
       * @param p  {@inheritDoc}
       * @return   {@inheritDoc}
       */
      @Override
      public R visitUnknown(AnnotationValue av, P p) {
          throw new UnknownAnnotationValueException(av, p);
      }
  }
  