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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.visitor;
import proguard.classfile.*;
/**
* This <code>ClassVisitor</code> delegates its visits to program classes to
* another given <code>ClassVisitor</code>, but only when the class version
* number of the visited program class lies in a given range.
*
* @author Eric Lafortune
*/
public class ClassVersionFilter implements ClassVisitor
{
private final int minimumClassVersion;
private final int maximumClassVersion;
private final ClassVisitor classVisitor;
/**
* Creates a new ClassVersionFilter.
* @param minimumClassVersion the minimum class version number.
* @param classVisitor the <code>ClassVisitor</code> to which visits
* will be delegated.
*/
public ClassVersionFilter(int minimumClassVersion,
ClassVisitor classVisitor)
{
this(minimumClassVersion, Integer.MAX_VALUE, classVisitor);
}
/**
* Creates a new ClassVersionFilter.
* @param minimumClassVersion the minimum class version number.
* @param maximumClassVersion the maximum class version number.
* @param classVisitor the <code>ClassVisitor</code> to which visits
* will be delegated.
*/
public ClassVersionFilter(int minimumClassVersion,
int maximumClassVersion,
ClassVisitor classVisitor)
{
this.minimumClassVersion = minimumClassVersion;
this.maximumClassVersion = maximumClassVersion;
this.classVisitor = classVisitor;
}
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
if (programClass.u4version >= minimumClassVersion &&
programClass.u4version <= maximumClassVersion)
{
classVisitor.visitProgramClass(programClass);
}
}
public void visitLibraryClass(LibraryClass libraryClass)
{
// Library classes don't have version numbers.
}
}
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