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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.shrink;
import proguard.classfile.*;
import proguard.classfile.visitor.MemberVisitor;
/**
* This MemberVisitor delegates all its method calls to another MemberVisitor,
* but only for Member objects that are marked as used.
*
* @see UsageMarker
*
* @author Eric Lafortune
*/
public class UsedMemberFilter
implements MemberVisitor
{
private final UsageMarker usageMarker;
private final MemberVisitor memberVisitor;
/**
* Creates a new UsedMemberFilter.
* @param usageMarker the usage marker that is used to mark the classes
* and class members.
* @param memberVisitor the member visitor to which the visiting will be
* delegated.
*/
public UsedMemberFilter(UsageMarker usageMarker,
MemberVisitor memberVisitor)
{
this.usageMarker = usageMarker;
this.memberVisitor = memberVisitor;
}
// Implementations for MemberVisitor.
public void visitProgramField(ProgramClass programClass, ProgramField programField)
{
if (usageMarker.isUsed(programField))
{
memberVisitor.visitProgramField(programClass, programField);
}
}
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
if (usageMarker.isUsed(programMethod))
{
memberVisitor.visitProgramMethod(programClass, programMethod);
}
}
public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
{
if (usageMarker.isUsed(libraryField))
{
memberVisitor.visitLibraryField(libraryClass, libraryField);
}
}
public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
{
if (usageMarker.isUsed(libraryMethod))
{
memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
}
}
}
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