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+/*
+ * 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);
+ }
+}