de.gmorling.methodvalidation.spring.ValidationInterceptor.java Source code

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Here is the source code for de.gmorling.methodvalidation.spring.ValidationInterceptor.java

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/**
 *  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.spring;

import java.util.Set;

import javax.inject.Inject;
import javax.validation.Validator;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import org.hibernate.validator.method.MethodConstraintViolation;
import org.hibernate.validator.method.MethodConstraintViolationException;
import org.hibernate.validator.method.MethodValidator;

/**
 * @author Kevin Pollet
 */
@Aspect
public class ValidationInterceptor {

    @Inject
    private Validator validator;

    //Match any public methods in a class annotated with @AutoValidating
    @Around("execution(public * *(..)) && @within(de.gmorling.methodvalidation.spring.AutoValidating)")
    public Object validateMethodInvocation(ProceedingJoinPoint pjp) throws Throwable {
        Object result;
        MethodSignature signature = (MethodSignature) pjp.getSignature();
        MethodValidator methodValidator = validator.unwrap(MethodValidator.class);

        Set<MethodConstraintViolation<Object>> parametersViolations = methodValidator
                .validateAllParameters(pjp.getTarget(), signature.getMethod(), pjp.getArgs());
        if (!parametersViolations.isEmpty()) {
            throw new MethodConstraintViolationException(parametersViolations);
        }

        result = pjp.proceed(); //Execute the method

        Set<MethodConstraintViolation<Object>> returnValueViolations = methodValidator
                .validateReturnValue(pjp.getTarget(), signature.getMethod(), result);
        if (!returnValueViolations.isEmpty()) {
            throw new MethodConstraintViolationException(returnValueViolations);
        }

        return result;
    }

}