org.cubeengine.butler.parameter.enumeration.SimpleEnumButler Maven / Gradle / Ivy
/*
* The MIT License
* Copyright © 2014 Cube Island
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.cubeengine.butler.parameter.enumeration;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;
import org.cubeengine.butler.Butler;
import org.cubeengine.butler.CommandInvocation;
import org.cubeengine.butler.CompletionHelper;
import org.cubeengine.butler.parameter.argument.ParserException;
/**
* A Reader for UpperCased Enum names
*/
public class SimpleEnumButler implements Butler
{
private final Map enumConstantNames = new WeakHashMap<>();
private EnumMetadata lookupMetadata(Class type)
{
EnumMetadata constantNames = enumConstantNames.get(type);
if (constantNames == null)
{
@SuppressWarnings("unchecked")
Enum[] enumConstants = ((Class>)type).getEnumConstants();
Map> constants = new HashMap<>(enumConstants.length);
for (final Enum constant : enumConstants)
{
constants.put(constant.name(), constant);
}
String name;
EnumName nameAnnotation = type.getAnnotation(EnumName.class);
if (nameAnnotation != null)
{
name = nameAnnotation.value();
}
else
{
name = type.getSimpleName();
}
EnumMetadata metadata = new EnumMetadata(name, constants);
enumConstantNames.put(type, metadata);
return metadata;
}
else
{
return constantNames;
}
}
private static boolean isEnum(Class t)
{
return Enum.class.isAssignableFrom(t);
}
private static String toEnumName(String name)
{
return name.replaceAll(" ", "_").toUpperCase();
}
@Override
public Object parse(Class type, CommandInvocation invocation) throws ParserException
{
if (!isEnum(type))
{
throw new UnsupportedOperationException();
}
EnumMetadata metadata = lookupMetadata(type);
Enum constant = metadata.getConstantLookup().get(toEnumName(invocation.currentToken()));
if (constant == null)
{
throw new ParserException("Could not find \"" + invocation.currentToken() + "\" in Enum");
}
invocation.consume(1);
return constant;
}
@Override
public List suggest(Class type, CommandInvocation invocation)
{
if (!isEnum(type))
{
return Collections.emptyList();
}
EnumMetadata metadata = lookupMetadata(type);
if (metadata == null)
{
return Collections.emptyList();
}
return CompletionHelper.complete(toEnumName(invocation.currentToken()), metadata.getNames());
}
}