/***
* 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.interceptor;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import javax.inject.Inject;
import javax.servlet.http.HttpSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import br.com.caelum.vraptor.InterceptionException;
import br.com.caelum.vraptor.Intercepts;
import br.com.caelum.vraptor.Result;
import br.com.caelum.vraptor.controller.ControllerMethod;
import br.com.caelum.vraptor.core.InterceptorStack;
import br.com.caelum.vraptor.http.MutableResponse;
import br.com.caelum.vraptor.http.MutableResponse.RedirectListener;
/**
* Interceptor that handles flash scope.
* @author Lucas Cavalcanti
* @author Adriano Almeida
* @since 3.0.2
*/
@Intercepts
public class FlashInterceptor implements Interceptor {
final static String FLASH_INCLUDED_PARAMETERS = "br.com.caelum.vraptor.flash.parameters";
private static final Logger LOGGER = LoggerFactory.getLogger(FlashInterceptor.class);
private HttpSession session;
private Result result;
private MutableResponse response;
//CDI eyes only
@Deprecated
public FlashInterceptor() {
}
@Inject
public FlashInterceptor(HttpSession session, Result result, MutableResponse response) {
this.session = session;
this.result = result;
this.response = response;
}
@Override
public boolean accepts(ControllerMethod method) {
return true;
}
@Override
public void intercept(InterceptorStack stack, ControllerMethod method, Object controllerInstance)
throws InterceptionException {
Map<String, Object> parameters = (Map<String, Object>) session.getAttribute(FLASH_INCLUDED_PARAMETERS);
if (parameters != null) {
parameters = new HashMap<>(parameters);
session.removeAttribute(FLASH_INCLUDED_PARAMETERS);
for (Entry<String, Object> parameter : parameters.entrySet()) {
result.include(parameter.getKey(), parameter.getValue());
}
}
response.addRedirectListener(new RedirectListener() {
@Override
public void beforeRedirect() {
Map<String, Object> included = result.included();
if (!included.isEmpty()) {
try {
session.setAttribute(FLASH_INCLUDED_PARAMETERS, new HashMap<>(included));
} catch (IllegalStateException e) {
LOGGER.info("HTTP Session was invalidated. It is not possible to include " +
"Result parameters on Flash Scope");
}
}
}
});
stack.next(method, controllerInstance);
}
}