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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:
* ( {@code visitAnnotation} | {@code visitTypeAnnotation} | {@code visitAttribute} )* {@code
* visitEnd}.
*
* @author Eric Bruneton
*/
public abstract class FieldVisitor {
/**
* The ASM API version implemented by this visitor. The value of this field must be one of the
* {@code ASM}<i>x</i> values in {@link Opcodes}.
*/
protected final int api;
/** The field visitor to which this visitor must delegate method calls. May be {@literal null}. */
protected FieldVisitor fv;
/**
* Constructs a new {@link FieldVisitor}.
*
* @param api the ASM API version implemented by this visitor. Must be one of the {@code
* ASM}<i>x</i> values in {@link Opcodes}.
*/
protected 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 the {@code
* ASM}<i>x</i> values in {@link Opcodes}.
* @param fieldVisitor the field visitor to which this visitor must delegate method calls. May be
* null.
*/
protected FieldVisitor(final int api, final FieldVisitor fieldVisitor) {
if (api != Opcodes.ASM9
&& api != Opcodes.ASM8
&& api != Opcodes.ASM7
&& api != Opcodes.ASM6
&& api != Opcodes.ASM5
&& api != Opcodes.ASM4
&& api != Opcodes.ASM10_EXPERIMENTAL) {
throw new IllegalArgumentException("Unsupported api " + api);
}
if (api == Opcodes.ASM10_EXPERIMENTAL) {
Constants.checkAsmExperimental(this);
}
this.api = api;
this.fv = fieldVisitor;
}
/**
* Visits an annotation of the field.
*
* @param descriptor the class descriptor of the annotation class.
* @param visible {@literal true} if the annotation is visible at runtime.
* @return a visitor to visit the annotation values, or {@literal null} if this visitor is not
* interested in visiting this annotation.
*/
public AnnotationVisitor visitAnnotation(final String descriptor, final boolean visible) {
if (fv != null) {
return fv.visitAnnotation(descriptor, visible);
}
return null;
}
/**
* Visits an annotation on the type of the field.
*
* @param typeRef a reference to the annotated type. The sort of this type reference must be
* {@link TypeReference#FIELD}. See {@link TypeReference}.
* @param typePath the path to the annotated type argument, wildcard bound, array element type, or
* static inner type within 'typeRef'. May be {@literal null} if the annotation targets
* 'typeRef' as a whole.
* @param descriptor the class descriptor of the annotation class.
* @param visible {@literal true} if the annotation is visible at runtime.
* @return a visitor to visit the annotation values, or {@literal null} if this visitor is not
* interested in visiting this annotation.
*/
public AnnotationVisitor visitTypeAnnotation(
final int typeRef, final TypePath typePath, final String descriptor, final boolean visible) {
if (api < Opcodes.ASM5) {
throw new UnsupportedOperationException("This feature requires ASM5");
}
if (fv != null) {
return fv.visitTypeAnnotation(typeRef, typePath, descriptor, visible);
}
return null;
}
/**
* Visits a non standard attribute of the field.
*
* @param attribute an attribute.
*/
public void visitAttribute(final Attribute attribute) {
if (fv != null) {
fv.visitAttribute(attribute);
}
}
/**
* 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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