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A reactive Java web server.
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/*
 * Copyright (c) 1998-2015 Caucho Technology -- all rights reserved
 *
 * This file is part of Baratine(TM)(TM)
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Baratine 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.
 *
 * Baratine 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Baratine; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Nam Nguyen
 */

package com.caucho.v5.bartender.files.provider;

import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Path;
import java.util.Iterator;

public class JDirectoryStream implements DirectoryStream
{
  private final JPath _dir;
  private final Filter _filter;

  
  private String []_childList;

  public JDirectoryStream(JPath dir, Filter filter)
  {
    _dir = dir;
    _filter = filter;

    _childList = dir.getBfsFile().list();
  }

  @Override
  public Iterator iterator()
  {
    return new JIterator(_dir, _filter, _childList);
  }

  @Override
  public void close() throws IOException
  {
  }

  static class JIterator implements Iterator {
    private final JPath _dir;
    private final Filter _filter;
    private final String []_childList;

    private int _index;
    private JPath _next;

    public JIterator(JPath dir, Filter filter, String []childList)
    {
      _dir = dir;
      _filter = filter;
      _childList = childList;

      next();
    }

    @Override
    public boolean hasNext()
    {
      return _next != null;
    }

    @Override
    public JPath next()
    {
      JPath current = _next;
      _next = null;

      while (_index < _childList.length) {
        String child = _childList[_index++];

        JPath path = (JPath) _dir.resolve(child);

        try {
          if (_filter != null && ! _filter.accept(path)) {
            continue;
          }
        }
        catch (IOException e) {
          throw new RuntimeException(e);
        }

        _next = path;

        break;
      }

      return current;
    }
  }

}