// 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 net.bytebuddy.jar.asm;
/**
* A visitor to visit a Java class. The methods of this class must be called in the following order:
* {@code visit} [ {@code visitSource} ] [ {@code visitModule} ][ {@code visitNestHost} ][ {@code
* visitOuterClass} ] ( {@code visitAnnotation} | {@code visitTypeAnnotation} | {@code
* visitAttribute} )* ( {@code visitNestMember} | {@code visitInnerClass} | {@code visitField} |
* {@code visitMethod} )* {@code visitEnd}.
*
* @author Eric Bruneton
*/
public abstract class
ClassVisitor {
/**
* 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 class visitor to which this visitor must delegate method calls. May be null. */
protected
ClassVisitor cv;
/**
* Constructs a new {@link ClassVisitor}.
*
* @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
ClassVisitor(final int
api) {
this(
api, null);
}
/**
* Constructs a new {@link ClassVisitor}.
*
* @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 classVisitor the class visitor to which this visitor must delegate method calls. May be
* null.
*/
public
ClassVisitor(final int
api, final
ClassVisitor classVisitor) {
if (
api !=
Opcodes.
ASM6 &&
api !=
Opcodes.
ASM5 &&
api !=
Opcodes.
ASM4 &&
api !=
Opcodes.
ASM7) {
throw new
IllegalArgumentException();
}
this.
api =
api;
this.
cv =
classVisitor;
}
/**
* Visits the header of the class.
*
* @param version the class version. The minor version is stored in the 16 most significant bits,
* and the major version in the 16 least significant bits.
* @param access the class's access flags (see {@link Opcodes}). This parameter also indicates if
* the class is deprecated.
* @param name the internal name of the class (see {@link Type#getInternalName()}).
* @param signature the signature of this class. May be {@literal null} if the class is not a
* generic one, and does not extend or implement generic classes or interfaces.
* @param superName the internal of name of the super class (see {@link Type#getInternalName()}).
* For interfaces, the super class is {@link Object}. May be {@literal null}, but only for the
* {@link Object} class.
* @param interfaces the internal names of the class's interfaces (see {@link
* Type#getInternalName()}). May be {@literal null}.
*/
public void
visit(
final int
version,
final int
access,
final
String name,
final
String signature,
final
String superName,
final
String[]
interfaces) {
if (
cv != null) {
cv.
visit(
version,
access,
name,
signature,
superName,
interfaces);
}
}
/**
* Visits the source of the class.
*
* @param source the name of the source file from which the class was compiled. May be {@literal
* null}.
* @param debug additional debug information to compute the correspondence between source and
* compiled elements of the class. May be {@literal null}.
*/
public void
visitSource(final
String source, final
String debug) {
if (
cv != null) {
cv.
visitSource(
source,
debug);
}
}
/**
* Visit the module corresponding to the class.
*
* @param name the fully qualified name (using dots) of the module.
* @param access the module access flags, among {@code ACC_OPEN}, {@code ACC_SYNTHETIC} and {@code
* ACC_MANDATED}.
* @param version the module version, or {@literal null}.
* @return a visitor to visit the module values, or {@literal null} if this visitor is not
* interested in visiting this module.
*/
public
ModuleVisitor visitModule(final
String name, final int
access, final
String version) {
if (
api <
Opcodes.
ASM6) {
throw new
UnsupportedOperationException("This feature requires ASM6");
}
if (
cv != null) {
return
cv.
visitModule(
name,
access,
version);
}
return null;
}
/**
* Visits the nest host class of the class. A nest is a set of classes of the same package that
* share access to their private members. One of these classes, called the host, lists the other
* members of the nest, which in turn should link to the host of their nest. This method must be
* called only once and only if the visited class is a non-host member of a nest. A class is
* implicitly its own nest, so it's invalid to call this method with the visited class name as
* argument.
*
* @param nestHost the internal name of the host class of the nest.
*/
public void
visitNestHost(final
String nestHost) {
if (
api <
Opcodes.
ASM7) {
throw new
UnsupportedOperationException("This feature requires ASM7");
}
if (
cv != null) {
cv.
visitNestHost(
nestHost);
}
}
/**
* Visits the enclosing class of the class. This method must be called only if the class has an
* enclosing class.
*
* @param owner internal name of the enclosing class of the class.
* @param name the name of the method that contains the class, or {@literal null} if the class is
* not enclosed in a method of its enclosing class.
* @param descriptor the descriptor of the method that contains the class, or {@literal null} if
* the class is not enclosed in a method of its enclosing class.
*/
public void
visitOuterClass(final
String owner, final
String name, final
String descriptor) {
if (
cv != null) {
cv.
visitOuterClass(
owner,
name,
descriptor);
}
}
/**
* Visits an annotation of the class.
*
* @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 (
cv != null) {
return
cv.
visitAnnotation(
descriptor,
visible);
}
return null;
}
/**
* Visits an annotation on a type in the class signature.
*
* @param typeRef a reference to the annotated type. The sort of this type reference must be
* {@link TypeReference#CLASS_TYPE_PARAMETER}, {@link
* TypeReference#CLASS_TYPE_PARAMETER_BOUND} or {@link TypeReference#CLASS_EXTENDS}. 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 (
cv != null) {
return
cv.
visitTypeAnnotation(
typeRef,
typePath,
descriptor,
visible);
}
return null;
}
/**
* Visits a non standard attribute of the class.
*
* @param attribute an attribute.
*/
public void
visitAttribute(final
Attribute attribute) {
if (
cv != null) {
cv.
visitAttribute(
attribute);
}
}
/**
* Visits a member of the nest. A nest is a set of classes of the same package that share access
* to their private members. One of these classes, called the host, lists the other members of the
* nest, which in turn should link to the host of their nest. This method must be called only if
* the visited class is the host of a nest. A nest host is implicitly a member of its own nest, so
* it's invalid to call this method with the visited class name as argument.
*
* @param nestMember the internal name of a nest member.
*/
public void
visitNestMember(final
String nestMember) {
if (
api <
Opcodes.
ASM7) {
throw new
UnsupportedOperationException("This feature requires ASM7");
}
if (
cv != null) {
cv.
visitNestMember(
nestMember);
}
}
/**
* Visits information about an inner class. This inner class is not necessarily a member of the
* class being visited.
*
* @param name the internal name of an inner class (see {@link Type#getInternalName()}).
* @param outerName the internal name of the class to which the inner class belongs (see {@link
* Type#getInternalName()}). May be {@literal null} for not member classes.
* @param innerName the (simple) name of the inner class inside its enclosing class. May be
* {@literal null} for anonymous inner classes.
* @param access the access flags of the inner class as originally declared in the enclosing
* class.
*/
public void
visitInnerClass(
final
String name, final
String outerName, final
String innerName, final int
access) {
if (
cv != null) {
cv.
visitInnerClass(
name,
outerName,
innerName,
access);
}
}
/**
* Visits a field of the class.
*
* @param access the field's access flags (see {@link Opcodes}). This parameter also indicates if
* the field is synthetic and/or deprecated.
* @param name the field's name.
* @param descriptor the field's descriptor (see {@link Type}).
* @param signature the field's signature. May be {@literal null} if the field's type does not use
* generic types.
* @param value the field's initial value. This parameter, which may be {@literal null} if the
* field does not have an initial value, must be an {@link Integer}, a {@link Float}, a {@link
* Long}, a {@link Double} or a {@link String} (for {@code int}, {@code float}, {@code long}
* or {@code String} fields respectively). <i>This parameter is only used for static
* fields</i>. Its value is ignored for non static fields, which must be initialized through
* bytecode instructions in constructors or methods.
* @return a visitor to visit field annotations and attributes, or {@literal null} if this class
* visitor is not interested in visiting these annotations and attributes.
*/
public
FieldVisitor visitField(
final int
access,
final
String name,
final
String descriptor,
final
String signature,
final
Object value) {
if (
cv != null) {
return
cv.
visitField(
access,
name,
descriptor,
signature,
value);
}
return null;
}
/**
* Visits a method of the class. This method <i>must</i> return a new {@link MethodVisitor}
* instance (or {@literal null}) each time it is called, i.e., it should not return a previously
* returned visitor.
*
* @param access the method's access flags (see {@link Opcodes}). This parameter also indicates if
* the method is synthetic and/or deprecated.
* @param name the method's name.
* @param descriptor the method's descriptor (see {@link Type}).
* @param signature the method's signature. May be {@literal null} if the method parameters,
* return type and exceptions do not use generic types.
* @param exceptions the internal names of the method's exception classes (see {@link
* Type#getInternalName()}). May be {@literal null}.
* @return an object to visit the byte code of the method, or {@literal null} if this class
* visitor is not interested in visiting the code of this method.
*/
public
MethodVisitor visitMethod(
final int
access,
final
String name,
final
String descriptor,
final
String signature,
final
String[]
exceptions) {
if (
cv != null) {
return
cv.
visitMethod(
access,
name,
descriptor,
signature,
exceptions);
}
return null;
}
/**
* Visits the end of the class. This method, which is the last one to be called, is used to inform
* the visitor that all the fields and methods of the class have been visited.
*/
public void
visitEnd() {
if (
cv != null) {
cv.
visitEnd();
}
}
}