// This Source Code is in the Public Domain per: http://litesoft.org/License.txt
package org.litesoft.util;

import java.io.*;

import org.litesoft.commonfoundation.typeutils.*;

public class DirectoriesDepthFirst
{
    public interface Visitor
    {
        public void process( File pDirectory )
                throws IOException;
    }

    private Visitor mVisitor;

    public DirectoriesDepthFirst( Visitor pVisitor )
    {
        Objects.assertNotNull( "DirectoriesDepthFirst.Visitor", mVisitor = pVisitor );
    }

    public void process( File pDirectory )
            throws IOException
    {
        if ( (pDirectory == null) || !pDirectory.isDirectory() )
        {
            throw new IllegalArgumentException( "Not a Directory: " + pDirectory );
        }
        LLprocess( pDirectory );
    }

    private void LLprocess( File pDirectory )
            throws IOException
    {
        File[] zFiles = pDirectory.listFiles( Directories.DirsOnlyFileFilter.INSTANCE );
        for ( File zFile : zFiles )
        {
            LLprocess( zFile );
        }
        mVisitor.process( pDirectory );
    }
}