/*
* JBoss, Home of Professional Open Source
* Copyright 2012, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 org.jboss.aerogear.controller.router;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.Map;
import java.util.Set;
import javax.enterprise.inject.Instance;
import javax.enterprise.inject.spi.BeanManager;
import javax.inject.Inject;
import javax.servlet.http.HttpServletRequest;
import org.jboss.aerogear.controller.log.AeroGearLogger;
import org.jboss.aerogear.controller.util.RequestUtils;
import org.jboss.aerogear.controller.util.StringUtils;
import br.com.caelum.iogi.Iogi;
import br.com.caelum.iogi.parameters.Parameter;
import br.com.caelum.iogi.reflection.Target;
import br.com.caelum.iogi.util.DefaultLocaleProvider;
import br.com.caelum.iogi.util.NullDependencyProvider;
import com.google.common.collect.Sets;
/**
* Default implementation of {@link RouteProcessor}.
* </p>
* This implementation uses Context and Dependency Injection (CDI) to have various parts injected into it. Of<br>
* particular interest for end users is the {@link RoutingModule} which is described in more detail in the section below.
*
* <h3> RoutingModule </h3>
* The CDI implementation will scan for an instance of {@link RoutingModule} upon deployment, and its<br>
* {@link RoutingModule#build()} method will be called to assemble the routes configured for this application.<br>
* To simplify this process {@link AbstractRoutingModule} is provided, please refer its javadoc for sample usage.
*/
public class DefaultRouteProcessor implements RouteProcessor {
private BeanManager beanManager;
private final Iogi iogi = new Iogi(new NullDependencyProvider(), new DefaultLocaleProvider());
private ControllerFactory controllerFactory;
private Set<Responder> responders = new LinkedHashSet<Responder>();
public DefaultRouteProcessor() {
}
@Inject
public DefaultRouteProcessor(BeanManager beanManager, Instance<Responder> responders, ControllerFactory controllerFactory) {
this.beanManager = beanManager;
this.controllerFactory = controllerFactory;
for (Responder responder : responders) {
this.responders.add(responder);
}
}
@Override
public void process(RouteContext routeContext) throws Exception {
final HttpServletRequest request = routeContext.getRequest();
final String requestPath = routeContext.getRequestPath();
final Route route = routeContext.getRoute();
Object[] params;
if (route.isParameterized()) {
params = extractPathParameters(requestPath, route);
} else {
params = extractParameters(request, route);
}
Object result = route.getTargetMethod().invoke(getController(route), params);
final Set<String> acceptHeaders = RequestUtils.extractAcceptHeader(request);
for (String mediaType : Sets.intersection(route.produces(), acceptHeaders)) {
if (respond(mediaType, result, routeContext)) {
return;
}
}
if (acceptHeaders.contains(MediaType.ANY.toString())) {
respond(MediaType.ANY.toString(), result, routeContext);
}
}
private boolean respond(final String mediaType, final Object result, final RouteContext routeContext) throws Exception {
for (Responder responder : responders) {
if (responder.accepts(mediaType)) {
responder.respond(result, routeContext);
return true;
}
}
return false;
}
private Object[] extractPathParameters(String requestPath, Route route) {
// TODO: extract this from Resteasy
final int paramOffset = route.getPath().indexOf('{');
final CharSequence param = requestPath.subSequence(paramOffset, requestPath.length());
return new Object[]{param.toString()};
}
private Object[] extractParameters(HttpServletRequest request, Route route) {
LinkedList<Parameter> parameters = new LinkedList<Parameter>();
Map<String, String[]> parameterMap = request.getParameterMap();
for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) {
String[] value = entry.getValue();
if (value.length == 1) {
parameters.add(new Parameter(entry.getKey(), value[0]));
} else {
AeroGearLogger.LOGGER.multivaluedParamsUnsupported();
}
}
Class<?>[] parameterTypes = route.getTargetMethod().getParameterTypes();
if (parameterTypes.length == 1) {
Class<?> parameterType = parameterTypes[0];
Target<?> target = Target.create(parameterType, StringUtils.downCaseFirst(parameterType.getSimpleName()));
Object instantiate = iogi.instantiate(target, parameters.toArray(new Parameter[parameters.size()]));
return new Object[]{instantiate};
}
return new Object[0];
}
private Object getController(Route route) {
return controllerFactory.createController(route.getTargetClass(), beanManager);
}
}