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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.constant.visitor;
import proguard.classfile.Clazz;
import proguard.classfile.constant.*;
import proguard.classfile.util.SimplifiedVisitor;
/**
* This <code>ConstantVisitor</code> delegates its visits to one or more
* specified types of constants.
*
* @author Eric Lafortune
*/
public class ConstantTagFilter
extends SimplifiedVisitor
implements ConstantVisitor
{
private final int constantTagMask;
private final ConstantVisitor constantVisitor;
/**
* Creates a new ConstantTagFilter.
* @param constantTag the type of constants for which visits will be
* delegated.
* @param constantVisitor the <code>ConstantVisitor</code> to which visits
* will be delegated.
*/
public ConstantTagFilter(int constantTag,
ConstantVisitor constantVisitor)
{
this.constantTagMask = 1 << constantTag;
this.constantVisitor = constantVisitor;
}
/**
* Creates a new ConstantTagFilter.
* @param constantTags the types of constants for which visits will be
* delegated.
* @param constantVisitor the <code>ConstantVisitor</code> to which visits
* will be delegated.
*/
public ConstantTagFilter(int[] constantTags,
ConstantVisitor constantVisitor)
{
int constantTagMask = 0;
for (int index = 0; index < constantTags.length; index++)
{
constantTagMask |= 1 << constantTags[index];
}
this.constantTagMask = constantTagMask;
this.constantVisitor = constantVisitor;
}
// Implementations for ConstantVisitor.
public void visitAnyConstant(Clazz clazz, Constant constant)
{
if (((1 << constant.getTag()) & constantTagMask) != 0)
{
constant.accept(clazz, constantVisitor);
}
}
}
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