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.classfile.visitor; 22 23 import proguard.classfile.*; 24 import proguard.classfile.util.*; 25 26 /** 27 * This <code>MemberVisitor</code> delegates its visits to another given 28 * <code>MemberVisitor</code>, but only when the visited member is accessible 29 * from the given referencing class. 30 * 31 * @author Eric Lafortune 32 */ 33 public class MemberClassAccessFilter 34 implements MemberVisitor 35 { 36 private final Clazz referencingClass; 37 private final MemberVisitor memberVisitor; 38 39 40 /** 41 * Creates a new MemberAccessFilter. 42 * @param referencingClass the class that is accessing the member. 43 * @param memberVisitor the <code>MemberVisitor</code> to which visits 44 * will be delegated. 45 */ MemberClassAccessFilter(Clazz referencingClass, MemberVisitor memberVisitor)46 public MemberClassAccessFilter(Clazz referencingClass, 47 MemberVisitor memberVisitor) 48 { 49 this.referencingClass = referencingClass; 50 this.memberVisitor = memberVisitor; 51 } 52 53 54 // Implementations for MemberVisitor. 55 visitProgramField(ProgramClass programClass, ProgramField programField)56 public void visitProgramField(ProgramClass programClass, ProgramField programField) 57 { 58 if (accepted(programClass, programField.getAccessFlags())) 59 { 60 memberVisitor.visitProgramField(programClass, programField); 61 } 62 } 63 64 visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)65 public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) 66 { 67 if (accepted(programClass, programMethod.getAccessFlags())) 68 { 69 memberVisitor.visitProgramMethod(programClass, programMethod); 70 } 71 } 72 73 visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)74 public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField) 75 { 76 if (accepted(libraryClass, libraryField.getAccessFlags())) 77 { 78 memberVisitor.visitLibraryField(libraryClass, libraryField); 79 } 80 } 81 82 visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)83 public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod) 84 { 85 if (accepted(libraryClass, libraryMethod.getAccessFlags())) 86 { 87 memberVisitor.visitLibraryMethod(libraryClass, libraryMethod); 88 } 89 } 90 91 92 // Small utility methods. 93 accepted(Clazz clazz, int memberAccessFlags)94 private boolean accepted(Clazz clazz, int memberAccessFlags) 95 { 96 int accessLevel = AccessUtil.accessLevel(memberAccessFlags); 97 98 return 99 (accessLevel >= AccessUtil.PUBLIC ) || 100 (accessLevel >= AccessUtil.PRIVATE && referencingClass.equals(clazz) ) || 101 (accessLevel >= AccessUtil.PACKAGE_VISIBLE && (ClassUtil.internalPackageName(referencingClass.getName()).equals( 102 ClassUtil.internalPackageName(clazz.getName())))) || 103 (accessLevel >= AccessUtil.PROTECTED && (referencingClass.extends_(clazz) || 104 referencingClass.extendsOrImplements(clazz)) ); 105 } 106 } 107