001 /* 002 * Copyright (C) 2010 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.completers; 021 022 import org.crsh.cmdline.ParameterDescriptor; 023 import org.crsh.cmdline.SimpleValueType; 024 import org.crsh.cmdline.spi.Completer; 025 import org.crsh.cmdline.spi.ValueCompletion; 026 027 import java.lang.reflect.Method; 028 029 /** 030 * A completer for enums. 031 * 032 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> 033 * @version $Revision$ 034 */ 035 public class EnumCompleter implements Completer { 036 037 /** . */ 038 private static final EnumCompleter instance = new EnumCompleter(); 039 040 /** 041 * Returns the empty completer instance. 042 * 043 * @return the instance 044 */ 045 public static EnumCompleter getInstance() { 046 return instance; 047 } 048 049 public ValueCompletion complete(ParameterDescriptor<?> parameter, String prefix) throws Exception { 050 ValueCompletion completions = ValueCompletion.create(); 051 if (parameter.getType() == SimpleValueType.ENUM) { 052 Class<?> vt = parameter.getJavaValueType(); 053 Method valuesM = vt.getDeclaredMethod("values"); 054 Method nameM = vt.getMethod("name"); 055 Enum<?>[] values = (Enum<?>[])valuesM.invoke(null); 056 for (Enum<?> value : values) { 057 String name = (String)nameM.invoke(value); 058 if (name.startsWith(prefix)) { 059 if (completions.isEmpty()) { 060 completions = new ValueCompletion(); 061 } 062 completions.put(name.substring(prefix.length()), true); 063 } 064 } 065 } 066 return completions; 067 } 068 }