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    import org.crsh.cmdline.spi.ValueCompletion;
029    
030    class ParameterCompletion extends Completion {
031    
032      /** . */
033      private final String prefix;
034    
035      /** . */
036      private final Delimiter delimiter;
037    
038      /** . */
039      private final ParameterDescriptor<?> parameter;
040    
041      /** . */
042      private final Completer completer;
043    
044      ParameterCompletion(String prefix, Delimiter delimiter, ParameterDescriptor<?> parameter, Completer completer) {
045        this.prefix = prefix;
046        this.delimiter = delimiter;
047        this.parameter = parameter;
048        this.completer = completer;
049      }
050    
051      CommandCompletion complete() throws CmdCompletionException {
052    
053        Class<? extends Completer> completerType = parameter.getCompleterType();
054        Completer completer = this.completer;
055    
056        // Use the most adapted completer
057        if (completerType != EmptyCompleter.class) {
058          try {
059            completer = completerType.newInstance();
060          }
061          catch (Exception e) {
062            throw new CmdCompletionException(e);
063          }
064        }
065    
066        //
067        if (completer != null) {
068          try {
069            return new CommandCompletion(delimiter, completer.complete(parameter, prefix));
070          }
071          catch (Exception e) {
072            throw new CmdCompletionException(e);
073          }
074        } else {
075          return new CommandCompletion(delimiter, ValueCompletion.create());
076        }
077      }
078    }