001/*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019package org.crsh.cli.completers;
020
021import org.crsh.cli.descriptor.ParameterDescriptor;
022import org.crsh.cli.spi.Completer;
023import org.crsh.cli.spi.Completion;
024
025import java.util.Enumeration;
026
027/**
028 * A completer for system property names.
029 *
030 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
031 */
032public class SystemPropertyNameCompleter implements Completer {
033
034  public Completion complete(ParameterDescriptor parameter, String prefix) throws Exception {
035    Completion.Builder b = new Completion.Builder(prefix);
036    for (Enumeration<Object> e = System.getProperties().keys();e.hasMoreElements();) {
037      Object key = e.nextElement();
038      if (key instanceof String) {
039        String s = (String)key;
040        if (s.startsWith(prefix)) {
041          b.add(s.substring(prefix.length()), true);
042        }
043      }
044    }
045    return b.build();
046  }
047}