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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2014 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.ACC_PUBLIC |
ClassConstants.ACC_PRIVATE |
ClassConstants.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);
}
}
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