ValidationInterceptor.java

/**
 *  Copyright 2011 Gunnar Morling (http://www.gunnarmorling.de/)
 *
 *  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 de.gmorling.methodvalidation.cdi;

import java.util.Set;

import javax.inject.Inject;
import javax.interceptor.AroundInvoke;
import javax.interceptor.Interceptor;
import javax.interceptor.InvocationContext;
import javax.validation.ValidatorFactory;

import org.hibernate.validator.MethodConstraintViolation;
import org.hibernate.validator.MethodConstraintViolationException;
import org.hibernate.validator.MethodValidator;

@AutoValidating
@Interceptor
public class ValidationInterceptor {

	@Inject
	private ValidatorFactory validatorFactory;

	@AroundInvoke
	public Object validateMethodInvocation(InvocationContext ctx) throws Exception {

		MethodValidator validator = validatorFactory.getValidator().unwrap(
			MethodValidator.class);

		Set<MethodConstraintViolation<Object>> violations = validator
			.validateParameters(
				ctx.getTarget(), ctx.getMethod(), ctx.getParameters());

		if (!violations.isEmpty()) {
			throw new MethodConstraintViolationException(violations);
		}

		Object result = ctx.proceed();

		violations = validator.validateReturnValue(ctx.getTarget(), ctx.getMethod(), result);

		if (!violations.isEmpty()) {
			throw new MethodConstraintViolationException(violations);
		}

		return result;
	}

}