proguard.optimize.KeptClassFilter Maven / Gradle / Ivy
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2018 GuardSquare NV
*
* 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.visitor.ClassVisitor;
/**
* This ClassVisitor delegates its visits to one of two ClassVisitor's,
* depending on whether the visited class is kept or not.
*
* @see KeepMarker
*
* @author Eric Lafortune
*/
public class KeptClassFilter
implements ClassVisitor
{
private final ClassVisitor acceptedVisitor;
private final ClassVisitor rejectedVisitor;
/**
* Creates a new KeptClassFilter.
*
* @param acceptedVisitor the class visitor to which accepted (kept)
* classes will be delegated.
*/
public KeptClassFilter(ClassVisitor acceptedVisitor)
{
this(acceptedVisitor, null);
}
/**
* Creates a new KeptClassFilter.
*
* @param acceptedVisitor the class visitor to which accepted (kept)
* classes will be delegated.
* @param rejectedVisitor the class visitor to which rejected (unkept)
* classes will be delegated.
*/
public KeptClassFilter(ClassVisitor acceptedVisitor,
ClassVisitor rejectedVisitor)
{
this.acceptedVisitor = acceptedVisitor;
this.rejectedVisitor = rejectedVisitor;
}
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
ClassVisitor delegateVisitor = selectVisitor(programClass);
if (delegateVisitor != null) {
delegateVisitor.visitProgramClass(programClass);
}
}
public void visitLibraryClass(LibraryClass libraryClass)
{
ClassVisitor delegateVisitor = selectVisitor(libraryClass);
if (delegateVisitor != null) {
delegateVisitor.visitLibraryClass(libraryClass);
}
}
// Small utility methods.
private ClassVisitor selectVisitor(Clazz clazz)
{
return KeepMarker.isKept(clazz) ? acceptedVisitor : rejectedVisitor;
}
}
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