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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.classfile.visitor;
import proguard.classfile.*;
/**
* This <code>ClassVisitor</code> delegates its visits to one of two
* <code>ClassVisitor</code> instances, depending on whether the name of
* the visited class file is present in a given <code>ClassPool</code> or not.
*
* @author Eric Lafortune
*/
public class ClassPresenceFilter implements ClassVisitor
{
private final ClassPool classPool;
private final ClassVisitor presentClassVisitor;
private final ClassVisitor missingClassVisitor;
/**
* Creates a new ClassPresenceFilter.
* @param classPool the <code>ClassPool</code> in which the
* presence will be tested.
* @param presentClassVisitor the <code>ClassVisitor</code> to which visits
* of present class files will be delegated.
* @param missingClassVisitor the <code>ClassVisitor</code> to which visits
* of missing class files will be delegated.
*/
public ClassPresenceFilter(ClassPool classPool,
ClassVisitor presentClassVisitor,
ClassVisitor missingClassVisitor)
{
this.classPool = classPool;
this.presentClassVisitor = presentClassVisitor;
this.missingClassVisitor = missingClassVisitor;
}
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
ClassVisitor classFileVisitor = classFileVisitor(programClass);
if (classFileVisitor != null)
{
classFileVisitor.visitProgramClass(programClass);
}
}
public void visitLibraryClass(LibraryClass libraryClass)
{
ClassVisitor classFileVisitor = classFileVisitor(libraryClass);
if (classFileVisitor != null)
{
classFileVisitor.visitLibraryClass(libraryClass);
}
}
// Small utility methods.
/**
* Returns the appropriate <code>ClassVisitor</code>.
*/
private ClassVisitor classFileVisitor(Clazz clazz)
{
return classPool.getClass(clazz.getName()) != null ?
presentClassVisitor :
missingClassVisitor;
}
}
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