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.impl.completion;
021
022 import org.crsh.cli.impl.Delimiter;
023 import org.crsh.cli.completers.EmptyCompleter;
024 import org.crsh.cli.descriptor.ParameterDescriptor;
025 import org.crsh.cli.spi.Completer;
026
027 import java.lang.reflect.Constructor;
028 import java.lang.reflect.InvocationTargetException;
029 import java.lang.reflect.Modifier;
030
031 class ParameterCompletion extends Completion {
032
033 /** . */
034 private final String prefix;
035
036 /** . */
037 private final Delimiter delimiter;
038
039 /** . */
040 private final ParameterDescriptor parameter;
041
042 /** . */
043 private final Completer completer;
044
045 public ParameterCompletion(String prefix, Delimiter delimiter, ParameterDescriptor parameter, Completer completer) {
046 this.prefix = prefix;
047 this.delimiter = delimiter;
048 this.parameter = parameter;
049 this.completer = completer;
050 }
051
052 public CompletionMatch complete() throws CompletionException {
053
054 //
055 Class<? extends Completer> completerType = parameter.getCompleterType();
056 Completer completer = null;
057 if (completerType != EmptyCompleter.class) {
058
059 // If the provided completer instance matches the parameter completer type
060 // then we use it
061 if (completerType.isInstance(this.completer)) {
062 completer = this.completer;
063 } else {
064 // Otherwise we instantiate it
065 Constructor<? extends Completer> ctor;
066 try {
067 ctor = completerType.getDeclaredConstructor();
068 }
069 catch (NoSuchMethodException ignore) {
070 throw new CompletionException("The completer " + completerType.getName() + " does not provide a no arg constructor");
071 }
072 if (Modifier.isPublic(ctor.getModifiers())) {
073 try {
074 completer = ctor.newInstance();
075 }
076 catch (InstantiationException e) {
077 throw new CompletionException("The completer " + completerType.getName() + " cannot be abstract");
078 }
079 catch (InvocationTargetException e) {
080 throw new CompletionException(e.getCause());
081 }
082 catch (Exception e) {
083 throw new CompletionException(e);
084 }
085 } else {
086 throw new CompletionException("The completer " + completerType.getName() + " constructor must be public");
087 }
088 }
089 }
090
091 //
092 if (completer != null) {
093 try {
094 return new CompletionMatch(delimiter, completer.complete(parameter, prefix));
095 }
096 catch (Exception e) {
097 throw new CompletionException(e);
098 }
099 } else {
100 return new CompletionMatch(delimiter, org.crsh.cli.spi.Completion.create());
101 }
102 }
103 }