1 /*
   2  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package javax.lang.model.util;
  27 
  28 import java.util.List;
  29 import javax.lang.model.element.*;
  30 
  31 import javax.lang.model.type.TypeMirror;
  32 import static javax.lang.model.SourceVersion.*;
  33 import javax.lang.model.SourceVersion;
  34 import javax.annotation.processing.SupportedSourceVersion;
  35 
  36 /**
  37  * A simple visitor for annotation values with default behavior
  38  * appropriate for the {@link SourceVersion#RELEASE_8 RELEASE_8}
  39  * source version.  Visit methods call {@link #defaultAction
  40  * defaultAction} passing their arguments to {@code defaultAction}'s
  41  * corresponding parameters.
  42  *
  43  * <p> Methods in this class may be overridden subject to their
  44  * general contract.  Note that annotating methods in concrete
  45  * subclasses with {@link java.lang.Override @Override} will help
  46  * ensure that methods are overridden as intended.
  47  *
  48  * <p> <b>WARNING:</b> The {@code AnnotationValueVisitor} interface
  49  * implemented by this class may have methods added to it in the
  50  * future to accommodate new, currently unknown, language structures
  51  * added to future versions of the Java&trade; programming language.
  52  * Therefore, methods whose names begin with {@code "visit"} may be
  53  * added to this class in the future; to avoid incompatibilities,
  54  * classes which extend this class should not declare any instance
  55  * methods with names beginning with {@code "visit"}.
  56  *
  57  * <p>When such a new visit method is added, the default
  58  * implementation in this class will be to call the {@link
  59  * #visitUnknown visitUnknown} method.  A new simple annotation
  60  * value visitor class will also be introduced to correspond to the
  61  * new language level; this visitor will have different default
  62  * behavior for the visit method in question.  When the new visitor is
  63  * introduced, all or portions of this visitor may be deprecated.
  64  *
  65  * @param <R> the return type of this visitor's methods
  66  * @param <P> the type of the additional parameter to this visitor's methods.
  67  *
  68  * @see SimpleAnnotationValueVisitor6
  69  * @see SimpleAnnotationValueVisitor7
  70  * @since 1.8
  71  */
  72 @SupportedSourceVersion(RELEASE_8)
  73 public class SimpleAnnotationValueVisitor8<R, P> extends SimpleAnnotationValueVisitor7<R, P> {
  74     /**
  75      * Constructor for concrete subclasses; uses {@code null} for the
  76      * default value.
  77      */
  78     protected SimpleAnnotationValueVisitor8() {
  79         super(null);
  80     }
  81 
  82     /**
  83      * Constructor for concrete subclasses; uses the argument for the
  84      * default value.
  85      *
  86      * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
  87      */
  88     protected SimpleAnnotationValueVisitor8(R defaultValue) {
  89         super(defaultValue);
  90     }
  91 }