/***
* 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
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.springframework.asm;
/**
* A visitor to visit a Java annotation. The methods of this class must be
* called in the following order: ( <tt>visit</tt> | <tt>visitEnum</tt> |
* <tt>visitAnnotation</tt> | <tt>visitArray</tt> )* <tt>visitEnd</tt>.
*
* @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} or {@link Opcodes#ASM6}.
*/
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} or {@link Opcodes#ASM6}.
*/
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} or {@link Opcodes#ASM6}.
* @param av
* the annotation visitor to which this visitor must delegate
* method calls. May be null.
*/
public
AnnotationVisitor(final int
api, final
AnnotationVisitor av) {
if (
api <
Opcodes.
ASM4 ||
api >
Opcodes.
ASM6) {
throw new
IllegalArgumentException();
}
this.
api =
api;
this.
av =
av;
}
/**
* 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 OBJECT or 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 visitArray} and visiting each array element
* in turn, but is more convenient).
*/
public void
visit(
String name,
Object value) {
if (
av != null) {
av.
visit(
name,
value);
}
}
/**
* Visits an enumeration value of the annotation.
*
* @param name
* the value name.
* @param desc
* the class descriptor of the enumeration class.
* @param value
* the actual enumeration value.
*/
public void
visitEnum(
String name,
String desc,
String value) {
if (
av != null) {
av.
visitEnum(
name,
desc,
value);
}
}
/**
* Visits a nested annotation value of the annotation.
*
* @param name
* the value name.
* @param desc
* the class descriptor of the nested annotation class.
* @return a visitor to visit the actual nested annotation value, or
* <tt>null</tt> 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(
String name,
String desc) {
if (
av != null) {
return
av.
visitAnnotation(
name,
desc);
}
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
* <tt>null</tt> 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(
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();
}
}
}