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Diffstat (limited to 'javax/lang/model/element/AnnotationValueVisitor.java')
| -rw-r--r-- | javax/lang/model/element/AnnotationValueVisitor.java | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/javax/lang/model/element/AnnotationValueVisitor.java b/javax/lang/model/element/AnnotationValueVisitor.java new file mode 100644 index 000000000..141aed6df --- /dev/null +++ b/javax/lang/model/element/AnnotationValueVisitor.java @@ -0,0 +1,224 @@ +/* AnnotationValueVisitor.java -- A visitor of annotation values. + Copyright (C) 2012 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package javax.lang.model.element; + +import java.util.List; + +import javax.lang.model.type.TypeMirror; + +/** + * <p>A visitor for annotation values. Unlike other visitors, such + * as {@link ElementVisitor} and {@link javax.lang.model.type.TypeVisitor}, + * which work on a concrete type hierarchy, this visitor dispatches based + * on the type of data stored in the annotation, some of which don't have + * distinct subclasses for storing them (e.g. primitives like {@code boolean} + * and {@code int}.</p> + * <p> The visitor is used when the specific type is not known at compile + * time. A visitor instance is passed to the + * {@link AnnotationValue#accept(AnnotationValueVisitor,P)} method of + * the type, which then calls the specific {@code visitN} method + * appropriate to that specific type.</p> + * <p>The additional parameter supplied to visitor methods may or + * may not be optional, and so the class is free to throw a + * {@code NullPointerException} if {@code null} is passed as the + * additional parameter.</p> + * <p>As this interface may be extended to accomodate future language + * versions, implementators are encouraged to extend one of the + * appropriate abstract classes rather than implementating this + * interface. However, this interface should be used as the type + * for parameters and return values.</p> + * + * @param <R> the return type of the visitor's methods. {@code Void} + * can be used where there is no return value. + * @param <P> the type of the additional parameter supplied to the visitor's + * methods. + * + * @author Andrew John Hughes (gnu_andrew@member.fsf.org) + * @since 1.6 + */ +public interface AnnotationValueVisitor<R,P> +{ + + /** + * A convenience method for use when there is no additional + * parameter to pass. This is equivalent to {@code #visit(value, null)}. + * + * @param value the value to visit. + * @return the return value specific to the visitor. + */ + R visit(AnnotationValue value); + + /** + * Visits a value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visit(AnnotationValue value, P param); + + /** + * Visits an annotation value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitAnnotation(AnnotationMirror value, P param); + + /** + * Visits an array value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitArray(List<? extends AnnotationValue> value, P param); + + /** + * Visits a boolean value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitBoolean(boolean value, P param); + + /** + * Visits a byte value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitByte(byte value, P param); + + /** + * Visits a character value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitChar(char value, P param); + + /** + * Visits a double value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitDouble(double value, P param); + + /** + * Visits an enum value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitEnumConstant(VariableElement value, P param); + + /** + * Visits a float value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitFloat(float value, P param); + + /** + * Visits an int value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitInt(int value, P param); + + /** + * Visits a long value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitLong(long value, P param); + + /** + * Visits a short value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitShort(short value, P param); + + /** + * Visits a {@code String} value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitString(String value, P param); + + /** + * Visits a type value. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + */ + R visitType(TypeMirror value, P param); + + /** + * Visits an unknown type of value. This method is called if + * a new type is added to the hierarchy which isn't yet + * handled by the visitor. + * + * @param value the value to visit. + * @param param the additional parameter, specific to the visitor. + * May be {@code null} if permitted by the visitor. + * @return the return value specific to the visitor. + */ + R visitUnknown(AnnotationValue value, P param); + +} |