jdk8-mips64-public/langtools: src/share/classes/javax/lang/model/util/SimpleTypeVisitor7.java@93012e2a5d1d

     1 /*

     2  * Copyright (c) 2010, 2013, 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  */

    26 package javax.lang.model.util;

    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.*;

    33 /**

    34  * A simple visitor of types with default behavior appropriate for the

    35  * {@link SourceVersion#RELEASE_7 RELEASE_7} source version.

    36  *

    37  * Visit methods corresponding to {@code RELEASE_7} 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 TypeVisitor} interface implemented

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

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

    50  * future versions of the Java&trade; 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 type 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  * <p>Note that adding a default implementation of a new visit method

    65  * in a visitor class will occur instead of adding a <em>default

    66  * method</em> directly in the visitor interface since a Java SE 8

    67  * language feature cannot be used to this version of the API since

    68  * this version is required to be runnable on Java SE 7

    69  * implementations.  Future versions of the API that are only required

    70  * to run on Java SE 8 and later may take advantage of default methods

    71  * in this situation.

    72  *

    73  * @param <R> the return type of this visitor's methods.  Use {@link

    74  *            Void} for visitors that do not need to return results.

    75  * @param <P> the type of the additional parameter to this visitor's

    76  *            methods.  Use {@code Void} for visitors that do not need an

    77  *            additional parameter.

    78  *

    79  * @see SimpleTypeVisitor6

    80  * @see SimpleTypeVisitor8

    81  * @since 1.7

    82  */

    83 @SupportedSourceVersion(RELEASE_7)

    84 public class SimpleTypeVisitor7<R, P> extends SimpleTypeVisitor6<R, P> {

    85     /**

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

    87      * default value.

    88      */

    89     protected SimpleTypeVisitor7(){

    90         super(null);

    91     }

    93     /**

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

    95      * default value.

    96      *

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

    98      */

    99     protected SimpleTypeVisitor7(R defaultValue){

   100         super(defaultValue);

   101     }

   103     /**

   104      * This implementation visits a {@code UnionType} by calling

   105      * {@code defaultAction}.

   106      *

   107      * @param t  {@inheritDoc}

   108      * @param p  {@inheritDoc}

   109      * @return the result of {@code defaultAction}

   110      */

   111     @Override

   112     public R visitUnion(UnionType t, P p) {

   113         return defaultAction(t, p);

   114     }

   115 }

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