1 /* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu) 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; either version 2 of the License, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, write to the Free Software Foundation, Inc., 19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 package proguard.obfuscate; 22 23 import proguard.classfile.*; 24 import proguard.classfile.constant.ClassConstant; 25 import proguard.classfile.constant.visitor.ConstantVisitor; 26 import proguard.classfile.editor.ConstantPoolEditor; 27 import proguard.classfile.util.SimplifiedVisitor; 28 import proguard.classfile.visitor.*; 29 30 /** 31 * This <code>ClassVisitor</code> renames the class names and class member 32 * names of the classes it visits, using names previously determined by the 33 * obfuscator. 34 * 35 * @see ClassObfuscator 36 * @see MemberObfuscator 37 * 38 * @author Eric Lafortune 39 */ 40 public class ClassRenamer 41 extends SimplifiedVisitor 42 implements ClassVisitor, 43 MemberVisitor, 44 ConstantVisitor 45 { 46 // Implementations for ClassVisitor. 47 visitProgramClass(ProgramClass programClass)48 public void visitProgramClass(ProgramClass programClass) 49 { 50 // Rename this class. 51 programClass.thisClassConstantAccept(this); 52 53 // Rename the class members. 54 programClass.fieldsAccept(this); 55 programClass.methodsAccept(this); 56 } 57 58 visitLibraryClass(LibraryClass libraryClass)59 public void visitLibraryClass(LibraryClass libraryClass) 60 { 61 libraryClass.thisClassName = ClassObfuscator.newClassName(libraryClass); 62 63 // Rename the class members. 64 libraryClass.fieldsAccept(this); 65 libraryClass.methodsAccept(this); 66 } 67 68 69 // Implementations for MemberVisitor. 70 visitProgramMember(ProgramClass programClass, ProgramMember programMember)71 public void visitProgramMember(ProgramClass programClass, 72 ProgramMember programMember) 73 { 74 // Has the class member name changed? 75 String name = programMember.getName(programClass); 76 String newName = MemberObfuscator.newMemberName(programMember); 77 if (newName != null && 78 !newName.equals(name)) 79 { 80 programMember.u2nameIndex = 81 new ConstantPoolEditor(programClass).addUtf8Constant(newName); 82 } 83 } 84 visitLibraryMember(LibraryClass libraryClass, LibraryMember libraryMember)85 public void visitLibraryMember(LibraryClass libraryClass, 86 LibraryMember libraryMember) 87 { 88 String newName = MemberObfuscator.newMemberName(libraryMember); 89 if (newName != null) 90 { 91 libraryMember.name = newName; 92 } 93 } 94 95 96 // Implementations for ConstantVisitor. 97 visitClassConstant(Clazz clazz, ClassConstant classConstant)98 public void visitClassConstant(Clazz clazz, ClassConstant classConstant) 99 { 100 // Update the Class entry if required. 101 String newName = ClassObfuscator.newClassName(clazz); 102 if (newName != null) 103 { 104 // Refer to a new Utf8 entry. 105 classConstant.u2nameIndex = 106 new ConstantPoolEditor((ProgramClass)clazz).addUtf8Constant(newName); 107 } 108 } 109 } 110