org.crsh.cmdline.completers.EnumCompleter Maven / Gradle / Ivy
/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.crsh.cmdline.completers;
import org.crsh.cmdline.ParameterDescriptor;
import org.crsh.cmdline.spi.Completion;
import org.crsh.cmdline.type.ValueType;
import org.crsh.cmdline.spi.Completer;
import java.lang.reflect.Method;
public class EnumCompleter implements Completer {
/** . */
private static final EnumCompleter instance = new EnumCompleter();
/**
* Returns the empty completer instance.
*
* @return the instance
*/
public static EnumCompleter getInstance() {
return instance;
}
public Completion complete(ParameterDescriptor parameter, String prefix) throws Exception {
if (parameter.getType() == ValueType.ENUM) {
Completion.Builder builder = null;
Class vt = parameter.getDeclaredType();
Method valuesM = vt.getDeclaredMethod("values");
Method nameM = vt.getMethod("name");
Enum[] values = (Enum[])valuesM.invoke(null);
for (Enum value : values) {
String name = (String)nameM.invoke(value);
if (name.startsWith(prefix)) {
if (builder == null) {
builder = Completion.builder(prefix);
}
builder.add(name.substring(prefix.length()), true);
}
}
return builder != null ? builder.build() : Completion.create();
} else {
return Completion.create();
}
}
}