org.bidib.wizard.api.aspect.PropertyChangeSupportAspect Maven / Gradle / Ivy

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package org.bidib.wizard.api.aspect;

import java.lang.reflect.Method;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Aspect
public class PropertyChangeSupportAspect {

    private static final Logger LOGGER = LoggerFactory.getLogger(PropertyChangeSupportAspect.class);

    @Pointcut("execution(public * set*(..))")
    private void anyPublicSetterOperation() {
    }

    @Before("anyPublicSetterOperation() && @annotation(org.bidib.wizard.api.annotation.PublishChange)")
    public void before(JoinPoint jp) throws Exception {
        LOGGER.info("Before was called.");
        String prop = jp.getSignature().getName().substring(3);
        Object target = jp.getTarget();

        Method method = null;
        try {
            method = target.getClass().getMethod("get" + prop);
        }
        catch (NoSuchMethodException ex) {
            method = target.getClass().getMethod("is" + prop);
        }

        Object before = method.invoke(target);
        Object now = jp.getArgs()[0];
        LOGGER.info(">>> Property '{}' changed from '{}' to '{}'", prop, before, now);
    }

}