/***
* 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.observer;
import br.com.caelum.vraptor.InterceptionException;
import br.com.caelum.vraptor.controller.ControllerMethod;
import br.com.caelum.vraptor.core.MethodInfo;
import br.com.caelum.vraptor.events.InterceptorsExecuted;
import br.com.caelum.vraptor.events.MethodExecuted;
import br.com.caelum.vraptor.events.MethodReady;
import br.com.caelum.vraptor.interceptor.ApplicationLogicException;
import br.com.caelum.vraptor.validator.ValidationException;
import br.com.caelum.vraptor.validator.Validator;
import net.vidageek.mirror.dsl.Mirror;
import net.vidageek.mirror.exception.ReflectionProviderException;
import org.slf4j.Logger;
import javax.enterprise.context.Dependent;
import javax.enterprise.event.Event;
import javax.enterprise.event.Observes;
import javax.inject.Inject;
import java.lang.reflect.Method;
import static br.com.caelum.vraptor.view.Results.nothing;
import static org.slf4j.LoggerFactory.getLogger;
/**
* Interceptor that executes the logic method.
*
* @author Guilherme Silveira
* @author Rodrigo Turini
* @author Victor Harada
*/
@Dependent
public class ExecuteMethod {
private final static Logger log = getLogger(ExecuteMethod.class);
private final MethodInfo methodInfo;
private final Validator validator;
private Event<MethodExecuted> methodExecutedEvent;
private Event<MethodReady> methodReady;
/**
* @deprecated CDI eyes only
*/
protected ExecuteMethod() {
this(null, null, null, null);
}
@Inject
public ExecuteMethod(MethodInfo methodInfo, Validator validator,
Event<MethodExecuted> methodExecutedEvent, Event<MethodReady> methodReady) {
this.methodInfo = methodInfo;
this.validator = validator;
this.methodExecutedEvent = methodExecutedEvent;
this.methodReady = methodReady;
}
public void execute(@Observes InterceptorsExecuted event) {
try {
ControllerMethod method = event.getControllerMethod();
methodReady.fire(new MethodReady(method));
Method reflectionMethod = method .getMethod();
Object[] parameters = methodInfo.getParametersValues();
log.debug("Invoking {}", reflectionMethod);
Object instance = event.getControllerInstance();
Object result = new Mirror().on(instance).invoke().method(reflectionMethod).withArgs(parameters);
if (validator.hasErrors()) { // method should have thrown
// ValidationException
if (log.isDebugEnabled()) {
try {
validator.onErrorUse(nothing());
} catch (ValidationException e) {
log.debug("Some validation errors occured: {}", e.getErrors());
}
}
throw new InterceptionException(
"There are validation errors and you forgot to specify where to go. Please add in your method "
+ "something like:\n"
+ "validator.onErrorUse(page()).of(AnyController.class).anyMethod();\n"
+ "or any view that you like.\n"
+ "If you didn't add any validation error, it is possible that a conversion error had happened.");
}
this.methodInfo.setResult(result);
methodExecutedEvent.fire(new MethodExecuted(method, methodInfo));
} catch (IllegalArgumentException e) {
throw new InterceptionException(e);
} catch (ReflectionProviderException e) {
throwIfNotValidationException(e, e.getCause());
} catch (Exception e) {
throwIfNotValidationException(e, e);
}
}
private void throwIfNotValidationException(Throwable original, Throwable alternativeCause) {
Throwable cause = original.getCause();
if (original instanceof ValidationException || cause instanceof ValidationException) {
// fine... already parsed
log.trace("swallowing {}", cause);
} else {
throw new ApplicationLogicException(alternativeCause);
}
}
}