org.cyclop.validation.AopValidator.java Source code

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Here is the source code for org.cyclop.validation.AopValidator.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.cyclop.validation;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Optional;

import javax.inject.Named;
import javax.validation.Valid;
import javax.validation.constraints.NotNull;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.cyclop.model.exception.BeanValidationException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Aspect
@Named
public class AopValidator {

    private final static Logger LOG = LoggerFactory.getLogger(AopValidator.class);

    @Pointcut("execution(* org.cyclop..*.*(..)) && @within(org.cyclop.validation.EnableValidation)")
    protected void validate() {
    }

    @Around("validate()")
    protected Object doValidate(ProceedingJoinPoint pjp) throws Throwable {
        try {
            executeParamValidation(pjp);
        } catch (BeanValidationException be) {
            throw be;
        } catch (Exception e) {
            LOG.error("Error executing param validation", e);
        }

        Object response = pjp.proceed();

        try {
            executeResponseValidation(pjp, response);
        } catch (BeanValidationException be) {
            throw be;
        } catch (Exception e) {
            LOG.error("Error executing response validation", e);
        }

        return response;
    }

    private void executeResponseValidation(ProceedingJoinPoint pjp, Object response) {
        MethodSignature sig = (MethodSignature) pjp.getSignature();
        Method method = sig.getMethod();

        BeanValidator validator = null;
        for (Annotation respAnnotatioin : method.getDeclaredAnnotations()) {
            if (respAnnotatioin.annotationType().isAssignableFrom(NotNull.class)
                    || (respAnnotatioin.annotationType().isAssignableFrom(Valid.class) && response != null)) {
                if (validator == null) {
                    validator = createValidator(pjp);
                }
                validator.add("METHOD_RETURN_VALUE", response);
            }
        }

        if (validator != null) {
            validator.validate();
        }
    }

    private void executeParamValidation(ProceedingJoinPoint pjp) {
        Object[] args = pjp.getArgs();
        MethodSignature sig = (MethodSignature) pjp.getSignature();
        Method method = sig.getMethod();
        Annotation[][] allParamAnnotations = method.getParameterAnnotations();

        BeanValidator validator = null;
        for (int paramIdx = 0; paramIdx < allParamAnnotations.length; paramIdx++) {
            Annotation[] paramAnnotations = allParamAnnotations[paramIdx];
            if (paramAnnotations == null || paramAnnotations.length == 0) {
                continue;
            }
            Object obj = args[paramIdx];
            if (contains(paramAnnotations, NotNull.class)
                    || (contains(paramAnnotations, Valid.class) && obj != null)) {
                if (validator == null) {
                    validator = createValidator(pjp);
                }
                validator.add("METHOD_PARAM_INDEX_" + paramIdx, obj);
            }
        }
        if (validator != null) {
            validator.validate();
        }
    }

    private BeanValidator createValidator(ProceedingJoinPoint pjp) {
        BeanValidator validator = BeanValidator.create(pjp.getSignature().toString());
        return validator;
    }

    private boolean contains(Annotation[] annotations, Class<?> annotation) {
        Optional<Annotation> res = Arrays.asList(annotations).stream()
                .filter(a -> a.annotationType().isAssignableFrom(annotation)).findFirst();
        return res.isPresent();
    }
}