Source Code Cross Referenced for AbstractElementVisitor6.java in  » 6.0-JDK-Modules-sun » javac-compiler » javax » lang » model » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules sun » javac compiler » javax.lang.model.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2005-2006 Sun Microsystems, Inc.  All Rights Reserved.
003:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004:         *
005:         * This code is free software; you can redistribute it and/or modify it
006:         * under the terms of the GNU General Public License version 2 only, as
007:         * published by the Free Software Foundation.  Sun designates this
008:         * particular file as subject to the "Classpath" exception as provided
009:         * by Sun in the LICENSE file that accompanied this code.
010:         *
011:         * This code is distributed in the hope that it will be useful, but WITHOUT
012:         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013:         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014:         * version 2 for more details (a copy is included in the LICENSE file that
015:         * accompanied this code).
016:         *
017:         * You should have received a copy of the GNU General Public License version
018:         * 2 along with this work; if not, write to the Free Software Foundation,
019:         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020:         *
021:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022:         * CA 95054 USA or visit www.sun.com if you need additional information or
023:         * have any questions.
024:         */
025:
026:        package javax.lang.model.util;
027:
028:        import javax.lang.model.element.*;
029:        import javax.annotation.processing.SupportedSourceVersion;
030:        import javax.lang.model.element.*;
031:        import static javax.lang.model.element.ElementKind.*;
032:        import static javax.lang.model.SourceVersion.*;
033:        import javax.lang.model.SourceVersion;
034:
035:        /**
036:         * A skeletal visitor of program elements with default behavior
037:         * appropriate for the {@link SourceVersion#RELEASE_6 RELEASE_6}
038:         * source version.
039:         *
040:         * <p> <b>WARNING:</b> The {@code ElementVisitor} interface
041:         * implemented by this class may have methods added to it in the
042:         * future to accommodate new, currently unknown, language structures
043:         * added to future versions of the Java&trade; programming language.
044:         * Therefore, methods whose names begin with {@code "visit"} may be
045:         * added to this class in the future; to avoid incompatibilities,
046:         * classes which extend this class should not declare any instance
047:         * methods with names beginning with {@code "visit"}.
048:         * 
049:         * <p>When such a new visit method is added, the default
050:         * implementation in this class will be to call the {@link
051:         * #visitUnknown visitUnknown} method.  A new abstract element visitor
052:         * class will also be introduced to correspond to the new language
053:         * level; this visitor will have different default behavior for the
054:         * visit method in question.  When the new visitor is introduced, all
055:         * or portions of this visitor may be deprecated.
056:         *
057:         * @param <R> the return type of this visitor's methods.  Use {@link
058:         * 	      Void} for visitors that do not need to return results.
059:         * @param <P> the type of the additional parameter to this visitor's
060:         *            methods.  Use {@code Void} for visitors that do not need an
061:         *            additional parameter.
062:         *
063:         * @author Joseph D. Darcy
064:         * @author Scott Seligman
065:         * @author Peter von der Ah&eacute;
066:         * @version 1.10 07/05/05
067:         * @since 1.6
068:         */
069:        @SupportedSourceVersion(RELEASE_6)
070:        public abstract class AbstractElementVisitor6<R, P> implements 
071:                ElementVisitor<R, P> {
072:            /**
073:             * Constructor for concrete subclasses to call.
074:             */
075:            protected AbstractElementVisitor6() {
076:            }
077:
078:            /**
079:             * Visits any program element as if by passing itself to that
080:             * element's {@link Element#accept accept} method.  The invocation
081:             * {@code v.visit(elem)} is equivalent to {@code elem.accept(v,
082:             * p)}.
083:             *
084:             * @param e  the element to visit
085:             * @param p  a visitor-specified parameter
086:             * @return a visitor-specified result
087:             */
088:            public final R visit(Element e, P p) {
089:                return e.accept(this , p);
090:            }
091:
092:            /**
093:             * Visits any program element as if by passing itself to that
094:             * element's {@link Element#accept accept} method and passing
095:             * {@code null} for the additional parameter.  The invocation
096:             * {@code v.visit(elem)} is equivalent to {@code elem.accept(v,
097:             * null)}.
098:             *
099:             * @param e  the element to visit
100:             * @return a visitor-specified result
101:             */
102:            public final R visit(Element e) {
103:                return e.accept(this , null);
104:            }
105:
106:            /**
107:             * {@inheritDoc}
108:             *
109:             * <p> The default implementation of this method in
110:             * {@code AbstractElementVisitor6} will always throw
111:             * {@code UnknownElementException}.
112:             * This behavior is not required of a subclass.
113:             *
114:             * @param e  the element to visit
115:             * @param p  a visitor-specified parameter
116:             * @return a visitor-specified result
117:             * @throws UnknownElementException
118:             *		a visitor implementation may optionally throw this exception
119:             */
120:            public R visitUnknown(Element e, P p) {
121:                throw new UnknownElementException(e, p);
122:            }
123:        }
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