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.cli.completers; 021 022 import org.crsh.cli.descriptor.ParameterDescriptor; 023 import org.crsh.cli.spi.Completion; 024 import org.crsh.cli.type.ValueType; 025 import org.crsh.cli.spi.Completer; 026 027 import java.lang.reflect.Method; 028 029 public class EnumCompleter implements Completer { 030 031 /** . */ 032 private static final EnumCompleter instance = new EnumCompleter(); 033 034 /** 035 * Returns the empty completer instance. 036 * 037 * @return the instance 038 */ 039 public static EnumCompleter getInstance() { 040 return instance; 041 } 042 043 public Completion complete(ParameterDescriptor parameter, String prefix) throws Exception { 044 if (parameter.getType() == ValueType.ENUM) { 045 Completion.Builder builder = null; 046 Class<?> vt = parameter.getDeclaredType(); 047 Method valuesM = vt.getDeclaredMethod("values"); 048 Method nameM = vt.getMethod("name"); 049 Enum<?>[] values = (Enum<?>[])valuesM.invoke(null); 050 for (Enum<?> value : values) { 051 String name = (String)nameM.invoke(value); 052 if (name.startsWith(prefix)) { 053 if (builder == null) { 054 builder = Completion.builder(prefix); 055 } 056 builder.add(name.substring(prefix.length()), true); 057 } 058 } 059 return builder != null ? builder.build() : Completion.create(); 060 } else { 061 return Completion.create(); 062 } 063 } 064 }