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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 class. The methods of this class must be called in the following order:
* visit [ visitSource ] [ visitModule ][ visitOuterClass ] (
* visitAnnotation | visitTypeAnnotation | visitAttribute )* (
* visitInnerClass | visitField | visitMethod )* 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} or {@link Opcodes#ASM6}.
*/
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} or {@link Opcodes#ASM6}.
*/
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} or {@link Opcodes#ASM6}.
* @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.ASM4 || api > Opcodes.ASM6) {
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 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 null, but only for the
* {@link Object} class.
* @param interfaces the internal names of the class's interfaces (see {@link
* Type#getInternalName()}). May be 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
* null.
* @param debug additional debug information to compute the correspondence between source and
* compiled elements of the class. May be 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 null.
* @return a visitor to visit the module values, or 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();
}
if (cv != null) {
return cv.visitModule(name, access, version);
}
return null;
}
/**
* 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 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 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 true if the annotation is visible at runtime.
* @return a visitor to visit the annotation values, or 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 null if the annotation targets
* 'typeRef' as a whole.
* @param descriptor the class descriptor of the annotation class.
* @param visible true if the annotation is visible at runtime.
* @return a visitor to visit the annotation values, or 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();
}
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 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 null for not member classes.
* @param innerName the (simple) name of the inner class inside its enclosing class. May be
* 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 null if the field's type does not use
* generic types.
* @param value the field's initial value. This parameter, which may be 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 int, float,
* long or String fields respectively). This parameter is only used for
* static fields. 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 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 must return a new {@link MethodVisitor}
* instance (or 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 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 null.
* @return an object to visit the byte code of the method, or 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();
}
}
}
