1/* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2013 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 */ 21package proguard.obfuscate; 22 23import proguard.classfile.*; 24import proguard.classfile.visitor.MemberVisitor; 25 26/** 27 * This <code>MemberVisitor</code> delegates its visits to another given 28 * <code>MemberVisitor</code>, but only when the visited member has a new name. 29 * Constructors are judged based on the class name. 30 * 31 * @see ClassObfuscator 32 * @see MemberObfuscator 33 * 34 * @author Eric Lafortune 35 */ 36public class MemberNameFilter implements MemberVisitor 37{ 38 private final MemberVisitor memberVisitor; 39 40 41 /** 42 * Creates a new MemberNameFilter. 43 * @param memberVisitor the <code>MemberVisitor</code> to which 44 * visits will be delegated. 45 */ 46 public MemberNameFilter(MemberVisitor memberVisitor) 47 { 48 this.memberVisitor = memberVisitor; 49 } 50 51 52 // Implementations for MemberVisitor. 53 54 public void visitProgramField(ProgramClass programClass, ProgramField programField) 55 { 56 if (hasName(programField)) 57 { 58 memberVisitor.visitProgramField(programClass, programField); 59 } 60 } 61 62 63 public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) 64 { 65 if (hasName(programClass, programMethod)) 66 { 67 memberVisitor.visitProgramMethod(programClass, programMethod); 68 } 69 } 70 71 72 public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField) 73 { 74 if (hasName(libraryField)) 75 { 76 memberVisitor.visitLibraryField(libraryClass, libraryField); 77 } 78 } 79 80 81 public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod) 82 { 83 if (hasName(libraryClass, libraryMethod)) 84 { 85 memberVisitor.visitLibraryMethod(libraryClass, libraryMethod); 86 } 87 } 88 89 90 // Small utility methods. 91 92 /** 93 * Returns whether the given class has a new name. 94 */ 95 private boolean hasName(Clazz clazz) 96 { 97 return ClassObfuscator.newClassName(clazz) != null; 98 } 99 100 101 /** 102 * Returns whether the given method has a new name. 103 */ 104 private boolean hasName(Clazz clazz, Method method) 105 { 106 return 107 hasName(method) || 108 (hasName(clazz) && 109 method.getName(clazz).equals(ClassConstants.INTERNAL_METHOD_NAME_INIT)); 110 } 111 112 113 /** 114 * Returns whether the given class member has a new name. 115 */ 116 private boolean hasName(Member member) 117 { 118 return MemberObfuscator.newMemberName(member) != null; 119 } 120} 121