1 /*
   2  * Copyright (c) 2010, 2014, 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 static javax.lang.model.SourceVersion.*;
  29 import javax.lang.model.SourceVersion;
  30 import javax.annotation.processing.SupportedSourceVersion;
  31 
  32 /**
  33  * A skeletal visitor for annotation values with default behavior
  34  * appropriate for the {@link SourceVersion#RELEASE_7 RELEASE_7}
  35  * source version.
  36  *
  37  * <p> <b>WARNING:</b> The {@code AnnotationValueVisitor} interface
  38  * implemented by this class may have methods added to it in the
  39  * future to accommodate new, currently unknown, language structures
  40  * added to future versions of the Java&trade; programming language.
  41  * Therefore, methods whose names begin with {@code "visit"} may be
  42  * added to this class in the future; to avoid incompatibilities,
  43  * classes which extend this class should not declare any instance
  44  * methods with names beginning with {@code "visit"}.
  45  *
  46  * <p>When such a new visit method is added, the default
  47  * implementation in this class will be to call the {@link
  48  * #visitUnknown visitUnknown} method.  A new abstract annotation
  49  * value visitor class will also be introduced to correspond to the
  50  * new language level; this visitor will have different default
  51  * behavior for the visit method in question.  When the new visitor is
  52  * introduced, all or portions of this visitor may be deprecated.
  53  *
  54  * <p>Note that adding a default implementation of a new visit method
  55  * in a visitor class will occur instead of adding a <em>default
  56  * method</em> directly in the visitor interface since a Java SE 8
  57  * language feature cannot be used to this version of the API since
  58  * this version is required to be runnable on Java SE 7
  59  * implementations.  Future versions of the API that are only required
  60  * to run on Java SE 8 and later may take advantage of default methods
  61  * in this situation.
  62  *
  63  * @param <R> the return type of this visitor's methods
  64  * @param <P> the type of the additional parameter to this visitor's methods.
  65  *
  66  * @see AbstractAnnotationValueVisitor6
  67  * @see AbstractAnnotationValueVisitor8
  68  * @see AbstractAnnotationValueVisitor9
  69  * @since 1.7
  70  */
  71 @SupportedSourceVersion(RELEASE_7)
  72 public abstract class AbstractAnnotationValueVisitor7<R, P> extends AbstractAnnotationValueVisitor6<R, P> {
  73 
  74     /**
  75      * Constructor for concrete subclasses to call.
  76      */
  77     @SuppressWarnings("deprecation") // Superclass constructor deprecated
  78     protected AbstractAnnotationValueVisitor7() {
  79         super();
  80     }
  81 }