/*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.ui.declarative.converters;
import java.util.Locale;
import com.vaadin.data.Converter;
import com.vaadin.data.Result;
import com.vaadin.data.ValueContext;
import com.vaadin.ui.declarative.DesignAttributeHandler;
/**
* An converter for Enum to/from String for {@link DesignAttributeHandler} to
* use internally.
*
* @since 7.4
* @author Vaadin Ltd
*/
@SuppressWarnings("rawtypes")
public class DesignEnumConverter<T extends Enum>
implements Converter<String, T> {
private final Class<T> type;
/**
* Creates a converter for the given enum type.
*
* @param type
* the enum type to convert to/from
*/
public DesignEnumConverter(Class<T> type) {
this.type = type;
}
@SuppressWarnings("unchecked")
@Override
public Result<T> convertToModel(String value, ValueContext context) {
if (value == null || value.trim().isEmpty()) {
return Result.ok(null);
}
try {
T result = (T) Enum.valueOf(type,
value.toUpperCase(Locale.ENGLISH));
return Result.ok(result);
} catch (Exception e) {
return Result.error(e.getMessage());
}
}
@Override
public String convertToPresentation(T value, ValueContext context) {
if (value == null) {
return null;
}
return value.name().toLowerCase(Locale.ENGLISH);
}
}