| // 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: |
| * <tt>visit</tt> [ <tt>visitSource</tt> ] [ <tt>visitModule</tt> ][ <tt>visitOuterClass</tt> ] ( |
| * <tt>visitAnnotation</tt> | <tt>visitTypeAnnotation</tt> | <tt>visitAttribute</tt> )* ( |
| * <tt>visitInnerClass</tt> | <tt>visitField</tt> | <tt>visitMethod</tt> )* <tt>visitEnd</tt>. |
| * |
| * @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() |
| * getInternalName}). |
| * @param signature the signature of this class. May be <tt>null</tt> 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() |
| * getInternalName}). For interfaces, the super class is {@link Object}. May be <tt>null</tt>, |
| * but only for the {@link Object} class. |
| * @param interfaces the internal names of the class's interfaces (see {@link |
| * Type#getInternalName() getInternalName}). May be <tt>null</tt>. |
| */ |
| 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 |
| * <tt>null</tt>. |
| * @param debug additional debug information to compute the correspondence between source and |
| * compiled elements of the class. May be <tt>null</tt>. |
| */ |
| 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 <tt>null</tt>. |
| * @return a visitor to visit the module values, or <tt>null</tt> 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 <tt>null</tt> 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 <tt>null</tt> 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 <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(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 <tt>null</tt> if the annotation targets |
| * 'typeRef' as a whole. |
| * @param descriptor 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 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() |
| * getInternalName}). |
| * @param outerName the internal name of the class to which the inner class belongs (see {@link |
| * Type#getInternalName() getInternalName}). May be <tt>null</tt> for not member classes. |
| * @param innerName the (simple) name of the inner class inside its enclosing class. May be |
| * <tt>null</tt> 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 Type}). |
| * @param signature the field's signature. May be <tt>null</tt> if the field's type does not use |
| * generic types. |
| * @param value the field's initial value. This parameter, which may be <tt>null</tt> 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 <tt>int</tt>, <tt>float</tt>, |
| * <tt>long</tt> or <tt>String</tt> 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 <tt>null</tt> 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 <tt>null</tt>) 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 Type}). |
| * @param signature the method's signature. May be <tt>null</tt> 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() getInternalName}). May be <tt>null</tt>. |
| * @return an object to visit the byte code of the method, or <tt>null</tt> 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(); |
| } |
| } |
| } |