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/***
* 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.objectweb.asm;
/**
* A visitor to visit a Java field. The methods of this class must be called in
* the following order: ( <tt>visitAnnotation</tt> | <tt>visitAttribute</tt> )*
* <tt>visitEnd</tt>.
*
* @author Eric Bruneton
*/
public abstract class FieldVisitor {
/**
* The ASM API version implemented by this visitor. The value of this field
* must be one of {@link Opcodes#ASM4}.
*/
protected final int api;
/**
* The field visitor to which this visitor must delegate method calls. May
* be null.
*/
protected FieldVisitor fv;
/**
* Constructs a new {@link FieldVisitor}.
*
* @param api
* the ASM API version implemented by this visitor. Must be one
* of {@link Opcodes#ASM4}.
*/
public FieldVisitor(final int api) {
this(api, null);
}
/**
* Constructs a new {@link FieldVisitor}.
*
* @param api
* the ASM API version implemented by this visitor. Must be one
* of {@link Opcodes#ASM4}.
* @param fv
* the field visitor to which this visitor must delegate method
* calls. May be null.
*/
public FieldVisitor(final int api, final FieldVisitor fv) {
if (api != Opcodes.ASM4) {
throw new IllegalArgumentException();
}
this.api = api;
this.fv = fv;
}
/**
* Visits an annotation of the field.
*
* @param desc
* the class descriptor of the annotation class.
* @param visible
* <tt>true</tt> if the annotation is visible at runtime.
* @return a visitor to visit the annotation values, or <tt>null</tt> if
* this visitor is not interested in visiting this annotation.
*/
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
if (fv != null) {
return fv.visitAnnotation(desc, visible);
}
return null;
}
/**
* Visits a non standard attribute of the field.
*
* @param attr
* an attribute.
*/
public void visitAttribute(Attribute attr) {
if (fv != null) {
fv.visitAttribute(attr);
}
}
/**
* Visits the end of the field. This method, which is the last one to be
* called, is used to inform the visitor that all the annotations and
* attributes of the field have been visited.
*/
public void visitEnd() {
if (fv != null) {
fv.visitEnd();
}
}
}
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