/***
* 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.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import br.com.caelum.vraptor.InterceptionException;
import br.com.caelum.vraptor.Validator;
import br.com.caelum.vraptor.core.InterceptorStack;
import br.com.caelum.vraptor.core.MethodInfo;
import br.com.caelum.vraptor.resource.ResourceMethod;
import br.com.caelum.vraptor.util.Stringnifier;
import br.com.caelum.vraptor.validator.ValidationException;
/**
* Interceptor that executes the logic method.
*
* @author Guilherme Silveira
*/
public class ExecuteMethodInterceptor implements Interceptor {
private final MethodInfo info;
private final Validator validator;
private final static Logger log = LoggerFactory.getLogger(ExecuteMethodInterceptor.class);
public ExecuteMethodInterceptor(MethodInfo info, Validator validator) {
this.info = info;
this.validator = validator;
}
public void intercept(InterceptorStack stack, ResourceMethod method, Object resourceInstance)
throws InterceptionException {
try {
Method reflectionMethod = method.getMethod();
Object[] parameters = this.info.getParameters();
log.debug("Invoking {}", Stringnifier.simpleNameFor(reflectionMethod));
Object result = reflectionMethod.invoke(resourceInstance, parameters);
if (validator.hasErrors()) { // method should have thrown
// ValidationError
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.");
}
if (reflectionMethod.getReturnType().equals(Void.TYPE)) {
// vraptor2 compatibility
this.info.setResult("ok");
} else {
this.info.setResult(result);
}
stack.next(method, resourceInstance);
} catch (IllegalArgumentException e) {
throw new InterceptionException(e);
} catch (IllegalAccessException e) {
throw new InterceptionException(e);
} catch (InvocationTargetException e) {
Throwable cause = e.getCause();
if (cause instanceof ValidationException) {
// fine... already parsed
log.trace("swallowing {}", cause);
} else {
throw new InterceptionException("exception raised, check root cause for details: " + cause, cause);
}
}
}
public boolean accepts(ResourceMethod method) {
return true;
}
}