/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2011 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.optimize;
import proguard.classfile.*;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.MemberVisitor;
import proguard.evaluation.value.Value;
import proguard.optimize.evaluation.StoringInvocationUnit;
/**
* This <code>MemberVisitor</code> delegates its visits to program class members
* to another given <code>MemberVisitor</code>, but only when the visited
* class member has been marked as a constant.
*
* @see StoringInvocationUnit
* @author Eric Lafortune
*/
public class ConstantMemberFilter
extends SimplifiedVisitor
implements MemberVisitor
{
private final MemberVisitor constantMemberVisitor;
/**
* Creates a new ConstantMemberFilter.
* @param constantMemberVisitor the <code>MemberVisitor</code> to which
* visits to constant members will be delegated.
*/
public ConstantMemberFilter(MemberVisitor constantMemberVisitor)
{
this.constantMemberVisitor = constantMemberVisitor;
}
// Implementations for MemberVisitor.
public void visitProgramField(ProgramClass programClass, ProgramField programField)
{
Value value = StoringInvocationUnit.getFieldValue(programField);
if (value != null &&
value.isParticular())
{
constantMemberVisitor.visitProgramField(programClass, programField);
}
}
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
Value value = StoringInvocationUnit.getMethodReturnValue(programMethod);
if (value != null &&
value.isParticular())
{
constantMemberVisitor.visitProgramMethod(programClass, programMethod);
}
}
}