content: /*
   * Copyright (c) 2017, Andreas Fagschlunger. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   *   - Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer.
   *
   *   - Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
   * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package at.o2xfs.xfs.conf;
  
  import at.o2xfs.log.Logger;
  import at.o2xfs.log.LoggerFactory;
  import at.o2xfs.win32.DWORD;
  import at.o2xfs.win32.HKEY;
  import at.o2xfs.xfs.XfsException;
  
  import java.util.Iterator;
  import java.util.NoSuchElementException;
  
  /**
   * @author Andreas Fagschlunger
   */
  public class WFMKeyIterator
  		implements Iterator<String>, Iterable<String> {
  
  	private static final Logger LOG = LoggerFactory.getLogger(WFMKeyIterator.class);
  
  	private O2XfsConf xfsConf = null;
  
  	private HKEY key = null;
  
  	private DWORD iSubKey = null;
  
  	private String nextKeyName = null;
  
  	public WFMKeyIterator(final HKEY key) {
  		xfsConf = O2XfsConf.getInstance();
  		this.key = key;
  		iSubKey = new DWORD(0);
  	}
  
  	@Override
  	public boolean hasNext() {
  		final String method = "hasNext()";
  		try {
  			nextKeyName = xfsConf.wfmEnumKey(key, iSubKey);
  			return true;
  		} catch (final CfgNoMoreItemsException e) {
  			if (LOG.isDebugEnabled()) {
  				LOG.debug(method, "No more subkeys", e);
  			}
  		} catch (final XfsException e) {
  			if (LOG.isErrorEnabled()) {
  				LOG.error(method, "Error enumerating: key=" + key + ",iSubKey=" + iSubKey, e);
  			}
  		}
  		return false;
  	}
  
  	@Override
  	public String next() {
  		if (nextKeyName == null) {
  			throw new NoSuchElementException("iSubKey: " + iSubKey);
  		}
  		iSubKey.set(iSubKey.longValue() + 1L);
  		try {
  			return nextKeyName;
  		} finally {
  			nextKeyName = null;
  		}
  	}
  
  	/**
  	 * @throws UnsupportedOperationException
  	 */
  	@Override
  	public void remove() {
  		throw new UnsupportedOperationException();
  	}
  
  	@Override
  	public Iterator<String> iterator() {
  		return this;
  	}
  
  }