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/*
* 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.util;
import proguard.classfile.ClassConstants;
/**
* Utility methods for working with access flags. For convenience, this class
* defines access levels, in ascending order: <code>PRIVATE</code>,
* <code>PACKAGE_VISIBLE</code>, <code>PROTECTED</code>, and <code>PUBLIC</code>.
*
* @author Eric Lafortune
*/
public class AccessUtil
{
public static final int PRIVATE = 0;
public static final int PACKAGE_VISIBLE = 1;
public static final int PROTECTED = 2;
public static final int PUBLIC = 3;
// The mask of access flags.
private static final int ACCESS_MASK =
ClassConstants.INTERNAL_ACC_PUBLIC |
ClassConstants.INTERNAL_ACC_PRIVATE |
ClassConstants.INTERNAL_ACC_PROTECTED;
/**
* Returns the corresponding access level of the given access flags.
* @param accessFlags the internal access flags.
* @return the corresponding access level: <code>PRIVATE</code>,
* <code>PACKAGE_VISIBLE</code>, <code>PROTECTED</code>, or
* <code>PUBLIC</code>.
*/
public static int accessLevel(int accessFlags)
{
switch (accessFlags & ACCESS_MASK)
{
case ClassConstants.INTERNAL_ACC_PRIVATE: return PRIVATE;
default: return PACKAGE_VISIBLE;
case ClassConstants.INTERNAL_ACC_PROTECTED: return PROTECTED;
case ClassConstants.INTERNAL_ACC_PUBLIC: return PUBLIC;
}
}
/**
* Returns the corresponding access flags of the given access level.
* @param accessLevel the access level: <code>PRIVATE</code>,
* <code>PACKAGE_VISIBLE</code>, <code>PROTECTED</code>,
* or <code>PUBLIC</code>.
* @return the corresponding internal access flags, the internal access
* flags as a logical bit mask of <code>INTERNAL_ACC_PRIVATE</code>,
* <code>INTERNAL_ACC_PROTECTED</code>, and
* <code>INTERNAL_ACC_PUBLIC</code>.
*/
public static int accessFlags(int accessLevel)
{
switch (accessLevel)
{
case PRIVATE: return ClassConstants.INTERNAL_ACC_PRIVATE;
default: return 0;
case PROTECTED: return ClassConstants.INTERNAL_ACC_PROTECTED;
case PUBLIC: return ClassConstants.INTERNAL_ACC_PUBLIC;
}
}
/**
* Replaces the access part of the given access flags.
* @param accessFlags the internal access flags.
* @param accessFlags the new internal access flags.
*/
public static int replaceAccessFlags(int accessFlags, int newAccessFlags)
{
// A private class member should not be explicitly final.
if (newAccessFlags == ClassConstants.INTERNAL_ACC_PRIVATE)
{
accessFlags &= ~ClassConstants.INTERNAL_ACC_FINAL;
}
return (accessFlags & ~ACCESS_MASK) |
(newAccessFlags & ACCESS_MASK);
}
}
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