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 javax.lang.model.type.*;
  29 import javax.annotation.processing.SupportedSourceVersion;
  30 import javax.lang.model.SourceVersion;
  31 import static javax.lang.model.SourceVersion.*;
  32 
  33 /**
  34  * A simple visitor of types with default behavior appropriate for the
  35  * {@linkplain SourceVersion#latest latest} source version.
  36  *
  37  * <p> Methods in this class may be overridden subject to their
  38  * general contract.  Note that annotating methods in concrete
  39  * subclasses with {@link java.lang.Override @Override} will help
  40  * ensure that methods are overridden as intended.
  41  *
  42  * <p> <b>WARNING:</b> The {@code TypeVisitor} interface implemented
  43  * by this class may have methods added to it in the future to
  44  * accommodate new, currently unknown, language structures added to
  45  * future versions of the Java&trade; programming language.
  46  * Therefore, methods whose names begin with {@code "visit"} may be
  47  * added to this class in the future; to avoid incompatibilities,
  48  * classes which extend this class should not declare any instance
  49  * methods with names beginning with {@code "visit"}.
  50  *
  51  * <p>When such a new visit method is added, the default
  52  * implementation in this class will be to call the {@link
  53  * #visitUnknown visitUnknown} method.  A new simple type visitor
  54  * class will also be introduced to correspond to the new language
  55  * level; this visitor will have different default behavior for the
  56  * visit method in question.  When the new visitor is introduced, all
  57  * or portions of this visitor may be deprecated.
  58  *
  59  * @param <R> the return type of this visitor's methods.  Use {@link
  60  *            Void} for visitors that do not need to return results.
  61  * @param <P> the type of the additional parameter to this visitor's
  62  *            methods.  Use {@code Void} for visitors that do not need an
  63  *            additional parameter.
  64  *
  65  * @see SimpleTypeVisitor6
  66  * @see SimpleTypeVisitor7
  67  * @see SimpleTypeVisitor8
  68  * @since 1.8
  69  */
  70 @SupportedSourceVersion(RELEASE_8)
  71 public class LatestSimpleTypeVisitor<R, P> extends SimpleTypeVisitor8<R, P> {
  72     /**
  73      * Constructor for concrete subclasses; uses {@code null} for the
  74      * default value.
  75      */
  76     protected LatestSimpleTypeVisitor(){
  77         super(null);
  78     }
  79 
  80     /**
  81      * Constructor for concrete subclasses; uses the argument for the
  82      * default value.
  83      *
  84      * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
  85      */
  86     protected LatestSimpleTypeVisitor(R defaultValue){
  87         super(defaultValue);
  88     }
  89 }