Mega Code Archive
Implements MethodBeforeAdvice To Check Parameters
<![CDATA[
File: context.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="afterBean" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target">
<bean class="MtBean">
<property name="firstName" value="AAA"/>
</bean>
</property>
<property name="interceptorNames">
<list>
<idref bean="nullArgumentsNotAllowedBeforeAdvice"/>
</list>
</property>
<property name="proxyTargetClass" value="true"/>
</bean>
<bean id="nullArgumentsNotAllowedBeforeAdvice"
class="NullArgumentsNotAllowedBeforeAdvice"/>
</beans>
File: Main.java
import java.lang.reflect.Method;
import org.springframework.aop.MethodBeforeAdvice;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
public class Main {
public static void main(String[] args) throws Exception {
BeanFactory beanFactory = new XmlBeanFactory(new ClassPathResource("context.xml"));
MtBean testBean = (MtBean) beanFactory
.getBean("afterBean");
testBean.showValues();
}
}
class MtBean {
private String firstName;
public String getFirstName() {
return this.firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public void showValues() {
System.out.println("First name: " + this.firstName);
}
}
class NullArgumentsNotAllowedBeforeAdvice implements MethodBeforeAdvice {
public void before(Method method, Object[] arguments, Object target)
throws Throwable {
if (arguments == null || arguments.length == 0) {
return;
}
for (int i = 0; i < arguments.length; i++) {
Object argument = arguments[i];
if (argument == null) {
throw new IllegalArgumentException(
"Value for argument [" + i + "] is required but not present " +
"for method [" + method + "]!"
);
}
}
}
}
]]>