ro4 / vanilla

import io.github.ro4.CheckTemplate;

import io.github.ro4.Context;

import io.github.ro4.check.CheckResult;

import io.github.ro4.check.ExceptionProvider;

import io.github.ro4.constant.MagicMark;

import org.aopalliance.intercept.MethodInterceptor;

import org.aopalliance.intercept.MethodInvocation;

import org.springframework.validation.BindingResult;

public class CheckableMethodInterceptor implements MethodInterceptor {

    private CheckTemplate checkTemplate;

    private ExceptionProvider<?> exceptionProvider;

    public void setCheckTemplate(CheckTemplate checkTemplate) {

        this.checkTemplate = checkTemplate;

    }

    @Override

    public Object invoke(MethodInvocation methodInvocation) throws Throwable {

        Checkable anno = methodInvocation.getMethod().getAnnotation(Checkable.class);

        boolean stopOnFirstFailure = anno.stopOnFirstFailure();

        Object[] args = methodInvocation.getArguments();

        BindingResult bindingResult = new CheckResult(methodInvocation.getMethod().getName());

        for (CheckRule checkRule : anno.value()) {

            Context ctx = new Context();

            for (int i = 0; i < args.length; i++) {

                ctx.setAttribute(MagicMark.ARGS_NAME + i, args[i]);

            }

            ctx.setAttribute(MagicMark.EXPRESSION, checkRule.expression());

            ctx.setAttribute(MagicMark.MESSAGE, checkRule.message());

            if (checkTemplate.check(ctx)) {

                continue;

            }

            bindingResult.reject(checkRule.field(), checkRule.message());

            if (stopOnFirstFailure) {

                break;

            }

        }

        if (bindingResult.hasErrors()) {

            RuntimeException throwable = exceptionProvider.produce(bindingResult);

            if (throwable != null) {

                throw throwable;

            }

        }

        return methodInvocation.proceed();

    }