/*** * 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.annotation.Priority; import javax.enterprise.context.ApplicationScoped; import javax.enterprise.inject.Alternative; import javax.interceptor.Interceptor; 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 @Alternative @Priority(Interceptor.Priority.LIBRARY_BEFORE) public class BooleanConverter implements Converter<Boolean> { private static final String INVALID_MESSAGE_KEY = "is_not_a_valid_boolean"; private static final Set<String> IS_TRUE = newHashSet("TRUE", "1", "YES", "Y", "ON"); private static final Set<String> IS_FALSE = newHashSet("FALSE", "0", "NO", "N", "OFF"); @Override public Boolean convert(String value, Class<? extends Boolean> 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(INVALID_MESSAGE_KEY, value)); } private static boolean matches(Set<String> words, String value) { return words.contains(value); } }