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Diffstat (limited to 'src/proguard/classfile/visitor/MemberAccessFilter.java')
-rw-r--r-- | src/proguard/classfile/visitor/MemberAccessFilter.java | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/src/proguard/classfile/visitor/MemberAccessFilter.java b/src/proguard/classfile/visitor/MemberAccessFilter.java new file mode 100644 index 0000000..6fd32e3 --- /dev/null +++ b/src/proguard/classfile/visitor/MemberAccessFilter.java @@ -0,0 +1,122 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2009 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); + } +} |