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     */
019    
020    package org.crsh.cmdline.matcher.impl;
021    
022    import org.crsh.cmdline.CommandCompletion;
023    import org.crsh.cmdline.Delimiter;
024    import org.crsh.cmdline.completers.EmptyCompleter;
025    import org.crsh.cmdline.ParameterDescriptor;
026    import org.crsh.cmdline.matcher.CmdCompletionException;
027    import org.crsh.cmdline.spi.Completer;
028    
029    class ParameterCompletion extends org.crsh.cmdline.matcher.impl.Completion {
030    
031      /** . */
032      private final String prefix;
033    
034      /** . */
035      private final Delimiter delimiter;
036    
037      /** . */
038      private final ParameterDescriptor<?> parameter;
039    
040      /** . */
041      private final Completer completer;
042    
043      ParameterCompletion(String prefix, Delimiter delimiter, ParameterDescriptor<?> parameter, Completer completer) {
044        this.prefix = prefix;
045        this.delimiter = delimiter;
046        this.parameter = parameter;
047        this.completer = completer;
048      }
049    
050      CommandCompletion complete() throws CmdCompletionException {
051    
052        Class<? extends Completer> completerType = parameter.getCompleterType();
053        Completer completer = this.completer;
054    
055        // Use the most adapted completer
056        if (completerType != EmptyCompleter.class) {
057          try {
058            completer = completerType.newInstance();
059          }
060          catch (Exception e) {
061            throw new CmdCompletionException(e);
062          }
063        }
064    
065        //
066        if (completer != null) {
067          try {
068            return new CommandCompletion(delimiter, completer.complete(parameter, prefix));
069          }
070          catch (Exception e) {
071            throw new CmdCompletionException(e);
072          }
073        } else {
074          return new CommandCompletion(delimiter, org.crsh.cmdline.spi.Completion.create());
075        }
076      }
077    }