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.service.lookup;
  
  import java.util.Enumeration;
  import java.util.NoSuchElementException;
  
  import at.o2xfs.log.Logger;
  import at.o2xfs.log.LoggerFactory;
  import at.o2xfs.win32.DWORD;
  import at.o2xfs.win32.HKEY;
  import at.o2xfs.xfs.XfsError;
  import at.o2xfs.xfs.XfsException;
  import at.o2xfs.xfs.conf.O2XfsConf;
  
  public class RegistryKeyEnumerator implements Enumeration<String> {
  
  	private final static Logger LOG = LoggerFactory.getLogger(RegistryKeyEnumerator.class);
  
  	private O2XfsConf xfsConf = null;
  
  	private HKEY hKey = null;
  
  	private DWORD iSubKey = null;
  
  	private String name = null;
  
  	public RegistryKeyEnumerator(final HKEY hKey) {
  		this.hKey = hKey;
  		iSubKey = new DWORD(0L);
  		xfsConf = O2XfsConf.getInstance();
  	}
  
  	@Override
  	public boolean hasMoreElements() {
  		final String method = "hasMoreElements()";
  		try {
  			name = xfsConf.wfmEnumKey(hKey, iSubKey);
  			return true;
  		} catch (final XfsException e) {
  			switch ((XfsError) e.getError()) {
  			case CFG_NO_MORE_ITEMS:
  				if (LOG.isDebugEnabled()) {
  					LOG.debug(method, "No more Items: hKey=" + hKey + ", iSubKey=" + iSubKey, e);
  				}
  				break;
  			default:
  				LOG.error(method, "Error enumerating subkey: hKey=" + hKey + ", iSubKey=" + iSubKey, e);
  			}
  		}
  		return false;
  	}
  
  	@Override
  	public String nextElement() {
  		if (name == null) {
  			throw new NoSuchElementException();
  		}
  		iSubKey.set(iSubKey.longValue() + 1);
  		return name;
  	}
  
  }