/***
* Copyright (c) 2009 Caelum - www.caelum.com.br/opensource
* All rights reserved.
*
* 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 br.com.caelum.vraptor.converter;
import static com.google.common.base.Strings.isNullOrEmpty;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Locale;
import javax.annotation.Priority;
import javax.enterprise.inject.Alternative;
import javax.inject.Inject;
import javax.interceptor.Interceptor;
import br.com.caelum.vraptor.Convert;
/**
* Localized version of VRaptor's Float converter. If the input value if empty or a null string, null value is
* returned. If the input string is not a number a {@link ConversionException} will be throw.
*
* @author Otávio Scherer Garcia
* @since 3.1.2
*/
@Convert(Float.class)
@Alternative
@Priority(Interceptor.Priority.LIBRARY_BEFORE)
public class FloatConverter implements Converter<Float> {
public static final String INVALID_MESSAGE_KEY = "is_not_a_valid_number";
private final Locale locale;
/**
* @deprecated CDI eyes only
*/
protected FloatConverter() {
this(null);
}
@Inject
public FloatConverter(Locale locale) {
this.locale = locale;
}
@Override
public Float convert(String value, Class<? extends Float> type) {
if (isNullOrEmpty(value)) {
return null;
}
try {
return getNumberFormat().parse(value).floatValue();
} catch (ParseException e) {
throw new ConversionException(new ConversionMessage(INVALID_MESSAGE_KEY, value));
}
}
protected NumberFormat getNumberFormat() {
return DecimalFormat.getInstance(locale);
}
}