1 /*

     2  * Copyright (c) 2011, 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 javax.annotation.processing.SupportedSourceVersion;

    29 import javax.lang.model.SourceVersion;

    30 import static javax.lang.model.SourceVersion.*;

    31 

    32 /**

    33  * A simple visitor of program elements with default behavior

    34  * appropriate for the {@link SourceVersion#RELEASE_9 RELEASE_9}

    35  * source version.

    36  *

    37  * Visit methods corresponding to {@code RELEASE_9} and earlier

    38  * language constructs call {@link #defaultAction defaultAction},

    39  * passing their arguments to {@code defaultAction}'s corresponding

    40  * parameters.

    41  *

    42  * <p> Methods in this class may be overridden subject to their

    43  * general contract.  Note that annotating methods in concrete

    44  * subclasses with {@link java.lang.Override @Override} will help

    45  * ensure that methods are overridden as intended.

    46  *

    47  * <p> <b>WARNING:</b> The {@code ElementVisitor} interface

    48  * implemented by this class may have methods added to it in the

    49  * future to accommodate new, currently unknown, language structures

    50  * added to future versions of the Java™ programming language.

    51  * Therefore, methods whose names begin with {@code "visit"} may be

    52  * added to this class in the future; to avoid incompatibilities,

    53  * classes which extend this class should not declare any instance

    54  * methods with names beginning with {@code "visit"}.

    55  *

    56  * <p>When such a new visit method is added, the default

    57  * implementation in this class will be to call the {@link

    58  * #visitUnknown visitUnknown} method.  A new simple element visitor

    59  * class will also be introduced to correspond to the new language

    60  * level; this visitor will have different default behavior for the

    61  * visit method in question.  When the new visitor is introduced, all

    62  * or portions of this visitor may be deprecated.

    63  *

    64  * @param <R> the return type of this visitor's methods.  Use {@code Void}

    65  *             for visitors that do not need to return results.

    66  * @param <P> the type of the additional parameter to this visitor's methods.  Use {@code Void}

    67  *              for visitors that do not need an additional parameter.

    68  *

    69  * @see SimpleElementVisitor6

    70  * @see SimpleElementVisitor7

    71  * @see SimpleElementVisitor8

    72  * @since 1.9

    73  */

    74 @SupportedSourceVersion(RELEASE_9)

    75 public class SimpleElementVisitor9<R, P> extends SimpleElementVisitor8<R, P> {

    76     /**

    77      * Constructor for concrete subclasses; uses {@code null} for the

    78      * default value.

    79      */

    80     protected SimpleElementVisitor9(){

    81         super(null);

    82     }

    83 

    84     /**

    85      * Constructor for concrete subclasses; uses the argument for the

    86      * default value.

    87      *

    88      * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}

    89      */

    90     protected SimpleElementVisitor9(R defaultValue){

    91         super(defaultValue);

    92     }

    93 }