| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu) |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| package proguard.classfile.visitor; |
| |
| import proguard.classfile.*; |
| |
| |
| /** |
| * This <code>MemberVisitor</code> delegates its visits to another given |
| * <code>MemberVisitor</code>, but only when the visited member has the proper |
| * access flags. |
| * <p> |
| * If conflicting access flags (public/private/protected) are specified, |
| * having one of them set will be considered sufficient. |
| * |
| * @see ClassConstants |
| * |
| * @author Eric Lafortune |
| */ |
| public class MemberAccessFilter |
| implements MemberVisitor |
| { |
| // A mask of conflicting access flags. These are interpreted in a special |
| // way if more of them are required at the same time. In that case, one |
| // of them being set is sufficient. |
| private static final int ACCESS_MASK = |
| ClassConstants.INTERNAL_ACC_PUBLIC | |
| ClassConstants.INTERNAL_ACC_PRIVATE | |
| ClassConstants.INTERNAL_ACC_PROTECTED; |
| |
| private final int requiredSetAccessFlags; |
| private final int requiredUnsetAccessFlags; |
| private final int requiredOneSetAccessFlags; |
| private final MemberVisitor memberVisitor; |
| |
| |
| /** |
| * Creates a new MemberAccessFilter. |
| * @param requiredSetAccessFlags the class access flags that should be |
| * set. |
| * @param requiredUnsetAccessFlags the class access flags that should be |
| * unset. |
| * @param memberVisitor the <code>MemberVisitor</code> to |
| * which visits will be delegated. |
| */ |
| public MemberAccessFilter(int requiredSetAccessFlags, |
| int requiredUnsetAccessFlags, |
| MemberVisitor memberVisitor) |
| { |
| this.requiredSetAccessFlags = requiredSetAccessFlags & ~ACCESS_MASK; |
| this.requiredUnsetAccessFlags = requiredUnsetAccessFlags; |
| this.requiredOneSetAccessFlags = requiredSetAccessFlags & ACCESS_MASK; |
| this.memberVisitor = memberVisitor; |
| } |
| |
| |
| // Implementations for MemberVisitor. |
| |
| public void visitProgramField(ProgramClass programClass, ProgramField programField) |
| { |
| if (accepted(programField.getAccessFlags())) |
| { |
| memberVisitor.visitProgramField(programClass, programField); |
| } |
| } |
| |
| |
| public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) |
| { |
| if (accepted(programMethod.getAccessFlags())) |
| { |
| memberVisitor.visitProgramMethod(programClass, programMethod); |
| } |
| } |
| |
| |
| public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField) |
| { |
| if (accepted(libraryField.getAccessFlags())) |
| { |
| memberVisitor.visitLibraryField(libraryClass, libraryField); |
| } |
| } |
| |
| |
| public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod) |
| { |
| if (accepted(libraryMethod.getAccessFlags())) |
| { |
| memberVisitor.visitLibraryMethod(libraryClass, libraryMethod); |
| } |
| } |
| |
| |
| // Small utility methods. |
| |
| private boolean accepted(int accessFlags) |
| { |
| return (requiredSetAccessFlags & ~accessFlags) == 0 && |
| (requiredUnsetAccessFlags & accessFlags) == 0 && |
| (requiredOneSetAccessFlags == 0 || |
| (requiredOneSetAccessFlags & accessFlags) != 0); |
| } |
| } |