/***
* 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.core;
import java.util.LinkedList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import br.com.caelum.vraptor.Convert;
import br.com.caelum.vraptor.Converter;
import br.com.caelum.vraptor.TwoWayConverter;
import br.com.caelum.vraptor.VRaptorException;
import br.com.caelum.vraptor.ioc.ApplicationScoped;
import br.com.caelum.vraptor.ioc.Container;
@ApplicationScoped
public final class DefaultConverters implements Converters {
private final LinkedList<Class<? extends Converter<?>>> classes;
private final Logger logger = LoggerFactory.getLogger(DefaultConverters.class);
private final Container container;
public DefaultConverters(Container container) {
this.container = container;
this.classes = new LinkedList<Class<? extends Converter<?>>>();
logger.info("Registering bundled converters");
for (Class<? extends Converter<?>> converterType : BaseComponents.getBundledConverters()) {
logger.debug("bundled converter to be registered: " + converterType);
register(converterType);
}
}
public void register(Class<? extends Converter<?>> converterClass) {
if (!converterClass.isAnnotationPresent(Convert.class)) {
throw new VRaptorException("The converter type " + converterClass.getName()
+ " should have the Convert annotation");
}
classes.addFirst(converterClass);
}
public Converter<?> to(Class<?> clazz) {
if (!existsFor(clazz)) {
throw new VRaptorException("Unable to find converter for " + clazz.getName());
}
return container.instanceFor(findConverterType(clazz));
}
private Class<? extends Converter<?>> findConverterType(Class<?> clazz) {
for (Class<? extends Converter<?>> converterType : classes) {
Class<?> boundType = converterType.getAnnotation(Convert.class).value();
if (boundType.isAssignableFrom(clazz)) {
return converterType;
}
}
return null;
}
public boolean existsFor(Class<?> type) {
return findConverterType(type) != null;
}
public boolean existsTwoWayFor(Class<?> type) {
Class<? extends Converter<?>> found = findConverterType(type);
return found != null && TwoWayConverter.class.isAssignableFrom(found);
}
public TwoWayConverter<?> twoWayConverterFor(Class<?> type) {
if (!existsTwoWayFor(type)) {
throw new VRaptorException("Unable to find two way converter for " + type.getName());
}
return (TwoWayConverter<?>) container.instanceFor(findConverterType(type));
}
}