// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holders nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
package org.objectweb.asm;
/**
* A visitor to visit a Java annotation. The methods of this class must be called in the following
* order: ( {@code visit} | {@code visitEnum} | {@code visitAnnotation} | {@code visitArray} )*
* {@code visitEnd}.
*
* @author Eric Bruneton
* @author Eugene Kuleshov
*/
public abstract class
AnnotationVisitor {
/**
* The ASM API version implemented by this visitor. The value of this field must be one of {@link
* Opcodes#ASM4}, {@link Opcodes#ASM5}, {@link Opcodes#ASM6} or {@link Opcodes#ASM7}.
*/
protected final int
api;
/** The annotation visitor to which this visitor must delegate method calls. May be null. */
protected
AnnotationVisitor av;
/**
* Constructs a new {@link AnnotationVisitor}.
*
* @param api the ASM API version implemented by this visitor. Must be one of {@link
* Opcodes#ASM4}, {@link Opcodes#ASM5}, {@link Opcodes#ASM6} or {@link Opcodes#ASM7}.
*/
public
AnnotationVisitor(final int
api) {
this(
api, null);
}
/**
* Constructs a new {@link AnnotationVisitor}.
*
* @param api the ASM API version implemented by this visitor. Must be one of {@link
* Opcodes#ASM4}, {@link Opcodes#ASM5}, {@link Opcodes#ASM6} or {@link Opcodes#ASM7}.
* @param annotationVisitor the annotation visitor to which this visitor must delegate method
* calls. May be null.
*/
public
AnnotationVisitor(final int
api, final
AnnotationVisitor annotationVisitor) {
if (
api !=
Opcodes.
ASM6 &&
api !=
Opcodes.
ASM5 &&
api !=
Opcodes.
ASM4 &&
api !=
Opcodes.
ASM7) {
throw new
IllegalArgumentException();
}
this.
api =
api;
this.
av =
annotationVisitor;
}
/**
* Visits a primitive value of the annotation.
*
* @param name the value name.
* @param value the actual value, whose type must be {@link Byte}, {@link Boolean}, {@link
* Character}, {@link Short}, {@link Integer} , {@link Long}, {@link Float}, {@link Double},
* {@link String} or {@link Type} of {@link Type#OBJECT} or {@link Type#ARRAY} sort. This
* value can also be an array of byte, boolean, short, char, int, long, float or double values
* (this is equivalent to using {@link #visitArray} and visiting each array element in turn,
* but is more convenient).
*/
public void
visit(final
String name, final
Object value) {
if (
av != null) {
av.
visit(
name,
value);
}
}
/**
* Visits an enumeration value of the annotation.
*
* @param name the value name.
* @param descriptor the class descriptor of the enumeration class.
* @param value the actual enumeration value.
*/
public void
visitEnum(final
String name, final
String descriptor, final
String value) {
if (
av != null) {
av.
visitEnum(
name,
descriptor,
value);
}
}
/**
* Visits a nested annotation value of the annotation.
*
* @param name the value name.
* @param descriptor the class descriptor of the nested annotation class.
* @return a visitor to visit the actual nested annotation value, or {@literal null} if this
* visitor is not interested in visiting this nested annotation. <i>The nested annotation
* value must be fully visited before calling other methods on this annotation visitor</i>.
*/
public
AnnotationVisitor visitAnnotation(final
String name, final
String descriptor) {
if (
av != null) {
return
av.
visitAnnotation(
name,
descriptor);
}
return null;
}
/**
* Visits an array value of the annotation. Note that arrays of primitive types (such as byte,
* boolean, short, char, int, long, float or double) can be passed as value to {@link #visit
* visit}. This is what {@link ClassReader} does.
*
* @param name the value name.
* @return a visitor to visit the actual array value elements, or {@literal null} if this visitor
* is not interested in visiting these values. The 'name' parameters passed to the methods of
* this visitor are ignored. <i>All the array values must be visited before calling other
* methods on this annotation visitor</i>.
*/
public
AnnotationVisitor visitArray(final
String name) {
if (
av != null) {
return
av.
visitArray(
name);
}
return null;
}
/** Visits the end of the annotation. */
public void
visitEnd() {
if (
av != null) {
av.
visitEnd();
}
}
}