ClassVisitor


1   /***
2    * ASM: a very small and fast Java bytecode manipulation framework
3    * Copyright (c) 2000-2005 INRIA, France Telecom
4    * All rights reserved.
5    *
6    * Redistribution and use in source and binary forms, with or without
7    * modification, are permitted provided that the following conditions
8    * are met:
9    * 1. Redistributions of source code must retain the above copyright
10   *    notice, this list of conditions and the following disclaimer.
11   * 2. Redistributions in binary form must reproduce the above copyright
12   *    notice, this list of conditions and the following disclaimer in the
13   *    documentation and/or other materials provided with the distribution.
14   * 3. Neither the name of the copyright holders nor the names of its
15   *    contributors may be used to endorse or promote products derived from
16   *    this software without specific prior written permission.
17   *
18   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28   * THE POSSIBILITY OF SUCH DAMAGE.
29   */
30  package org.objectweb.asm;
31  
32  /**
33   * A visitor to visit a Java class. The methods of this interface must be called
34   * in the following order: <tt>visit</tt> [ <tt>visitSource</tt> ] [
35   * <tt>visitOuterClass</tt> ] ( <tt>visitAnnotation</tt> |
36   * <tt>visitAttribute</tt> )* (<tt>visitInnerClass</tt> |
37   * <tt>visitField</tt> | <tt>visitMethod</tt> )* <tt>visitEnd</tt>.
38   * 
39   * @author Eric Bruneton
40   */
41  public interface ClassVisitor {
42  
43      /**
44       * Visits the header of the class.
45       * 
46       * @param version the class version.
47       * @param access the class's access flags (see {@link Opcodes}). This
48       *        parameter also indicates if the class is deprecated.
49       * @param name the internal name of the class (see
50       *        {@link Type#getInternalName() getInternalName}).
51       * @param signature the signature of this class. May be <tt>null</tt> if
52       *        the class is not a generic one, and does not extend or implement
53       *        generic classes or interfaces.
54       * @param superName the internal of name of the super class (see
55       *        {@link Type#getInternalName() getInternalName}). For interfaces,
56       *        the super class is {@link Object}. May be <tt>null</tt>, but
57       *        only for the {@link Object} class.
58       * @param interfaces the internal names of the class's interfaces (see
59       *        {@link Type#getInternalName() getInternalName}). May be
60       *        <tt>null</tt>.
61       */
62      void visit(
63          int version,
64          int access,
65          String   name,
66          String   signature,
67          String   superName,
68          String  [] interfaces);
69  
70      /**
71       * Visits the source of the class.
72       * 
73       * @param source the name of the source file from which the class was
74       *        compiled. May be <tt>null</tt>.
75       * @param debug additional debug information to compute the correspondance
76       *        between source and compiled elements of the class. May be
77       *        <tt>null</tt>.
78       */
79      void visitSource(String   source, String   debug);
80  
81      /**
82       * Visits the enclosing class of the class. This method must be called only
83       * if the class has an enclosing class.
84       * 
85       * @param owner internal name of the enclosing class of the class.
86       * @param name the name of the method that contains the class, or
87       *        <tt>null</tt> if the class is not enclosed in a method of its
88       *        enclosing class.
89       * @param desc the descriptor of the method that contains the class, or
90       *        <tt>null</tt> if the class is not enclosed in a method of its
91       *        enclosing class.
92       */
93      void visitOuterClass(String   owner, String   name, String   desc);
94  
95      /**
96       * Visits an annotation of the class.
97       * 
98       * @param desc the class descriptor of the annotation class.
99       * @param visible <tt>true</tt> if the annotation is visible at runtime.
100      * @return a non null visitor to visit the annotation values.
101      */
102     AnnotationVisitor visitAnnotation(String   desc, boolean visible);
103 
104     /**
105      * Visits a non standard attribute of the class.
106      * 
107      * @param attr an attribute.
108      */
109     void visitAttribute(Attribute attr);
110 
111     /**
112      * Visits information about an inner class. This inner class is not
113      * necessarily a member of the class being visited.
114      * 
115      * @param name the internal name of an inner class (see
116      *        {@link Type#getInternalName() getInternalName}).
117      * @param outerName the internal name of the class to which the inner class
118      *        belongs (see {@link Type#getInternalName() getInternalName}). May
119      *        be <tt>null</tt>.
120      * @param innerName the (simple) name of the inner class inside its
121      *        enclosing class. May be <tt>null</tt> for anonymous inner
122      *        classes.
123      * @param access the access flags of the inner class as originally declared
124      *        in the enclosing class.
125      */
126     void visitInnerClass(
127         String   name,
128         String   outerName,
129         String   innerName,
130         int access);
131 
132     /**
133      * Visits a field of the class.
134      * 
135      * @param access the field's access flags (see {@link Opcodes}). This
136      *        parameter also indicates if the field is synthetic and/or
137      *        deprecated.
138      * @param name the field's name.
139      * @param desc the field's descriptor (see {@link Type Type}).
140      * @param signature the field's signature. May be <tt>null</tt> if the
141      *        field's type does not use generic types.
142      * @param value the field's initial value. This parameter, which may be
143      *        <tt>null</tt> if the field does not have an initial value, must
144      *        be an {@link Integer}, a {@link Float}, a {@link Long}, a
145      *        {@link Double} or a {@link String} (for <tt>int</tt>,
146      *        <tt>float</tt>, <tt>long</tt> or <tt>String</tt> fields
147      *        respectively). <i>This parameter is only used for static fields</i>.
148      *        Its value is ignored for non static fields, which must be
149      *        initialized through bytecode instructions in constructors or
150      *        methods.
151      * @return a visitor to visit field annotations and attributes, or
152      *         <tt>null</tt> if this class visitor is not interested in
153      *         visiting these annotations and attributes.
154      */
155     FieldVisitor visitField(
156         int access,
157         String   name,
158         String   desc,
159         String   signature,
160         Object   value);
161 
162     /**
163      * Visits a method of the class. This method <i>must</i> return a new
164      * {@link MethodVisitor} instance (or <tt>null</tt>) each time it is
165      * called, i.e., it should not return a previously returned visitor.
166      * 
167      * @param access the method's access flags (see {@link Opcodes}). This
168      *        parameter also indicates if the method is synthetic and/or
169      *        deprecated.
170      * @param name the method's name.
171      * @param desc the method's descriptor (see {@link Type Type}).
172      * @param signature the method's signature. May be <tt>null</tt> if the
173      *        method parameters, return type and exceptions do not use generic
174      *        types.
175      * @param exceptions the internal names of the method's exception classes
176      *        (see {@link Type#getInternalName() getInternalName}). May be
177      *        <tt>null</tt>.
178      * @return an object to visit the byte code of the method, or <tt>null</tt>
179      *         if this class visitor is not interested in visiting the code of
180      *         this method.
181      */
182     MethodVisitor visitMethod(
183         int access,
184         String   name,
185         String   desc,
186         String   signature,
187         String  [] exceptions);
188 
189     /**
190      * Visits the end of the class. This method, which is the last one to be
191      * called, is used to inform the visitor that all the fields and methods of
192      * the class have been visited.
193      */
194     void visitEnd();
195 }
196
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