br.com.caelum.vraptor.converter.BooleanConverter Maven / Gradle / Ivy
/***
* 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 static com.google.common.collect.Sets.newHashSet;
import java.util.Set;
import javax.enterprise.context.ApplicationScoped;
import br.com.caelum.vraptor.Convert;
/**
* VRaptor's Boolean converter.
*
* Supports boolean-like values. Converts to TRUE the following strings : true,
* 1, yes, y, on Converts to FALSE the following strings: false, 0, no, n, off
*
* @author Guilherme Silveira
*/
@Convert(Boolean.class)
@ApplicationScoped
public class BooleanConverter implements Converter {
private static final Set IS_TRUE = newHashSet("TRUE", "1", "YES", "Y", "ON");
private static final Set IS_FALSE = newHashSet("FALSE", "0", "NO", "N", "OFF");
@Override
public Boolean convert(String value, Class type) {
if (isNullOrEmpty(value)) {
return null;
}
value = value.toUpperCase();
if (matches(IS_TRUE, value)) {
return true;
} else if (matches(IS_FALSE, value)) {
return false;
}
throw new ConversionException(new ConversionMessage("is_not_a_valid_boolean", value));
}
private boolean matches(Set words, String value) {
return words.contains(value);
}
}