add annotion

src/main/resources/java/com/wwq/calculator/ArithmeticCalculatorImpl.java

@@ -9,6 +9,7 @@ public double add(double a, double b) {
 		return result;
 	}
 
+	@LoggingRequired
 	public double sub(double a, double b) {
 		// TODO Auto-generated method stub
 		double result = a - b;

src/main/resources/java/com/wwq/calculator/CalculatorLoggingAspect.java

@@ -11,9 +11,10 @@
 import org.aspectj.lang.annotation.Around;
 import org.aspectj.lang.annotation.Aspect;
 import org.aspectj.lang.annotation.Before;
+import org.springframework.core.Ordered;
 
 @Aspect
-public class CalculatorLoggingAspect {
+public class CalculatorLoggingAspect implements Ordered{
 	/**
 	 * Logger for this class
 	 */
@@ -94,12 +95,22 @@ public Object logAround(ProceedingJoinPoint joinPoint) throws Throwable {
 			throw e;
 		}
 	}
+
+	@After(value = "@annotation (com.wwq.calculator.LoggingRequired)")
+	public void loggingRequired(){
+		logger.info("JUST TEST!!!JUST TEST!!!JUST TEST!!!");
+	}
 	/**
 	 * @param args
 	 */
 	public static void main(String[] args) {
 		// TODO Auto-generated method stub
 
 	}
+	@Override
+	public int getOrder() {
+		// TODO Auto-generated method stub
+		return 0;
+	}
 
 }

src/main/resources/java/com/wwq/calculator/CalculatorValidationAspect.java

@@ -0,0 +1,28 @@
+package com.wwq.calculator;
+
+import org.aspectj.lang.JoinPoint;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Before;
+import org.springframework.core.Ordered;
+
+@Aspect
+public class CalculatorValidationAspect implements Ordered{
+	@Before("execution(* *.*(double,double))")
+	public void validateBefore(JoinPoint joinPoint) {
+		for (Object arg : joinPoint.getArgs()) {
+			validate((Double) arg);
+		}
+	}
+
+	private void validate(double a) {
+		if (a < 0) {
+			throw new IllegalArgumentException("Positive number only");
+		}
+	}
+
+	@Override
+	public int getOrder() {
+		// TODO Auto-generated method stub
+		return 1;
+	}
+}

src/main/resources/java/com/wwq/calculator/LoggingRequired.java

@@ -0,0 +1,14 @@
+package com.wwq.calculator;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({ElementType.METHOD,ElementType.TYPE})
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+public @interface LoggingRequired {
+
+}

src/main/resources/java/com/wwq/calculator/Main.java

@@ -16,15 +16,15 @@ public static void main(String[] args) {
 				"src/main/webapp/WEB-INF/applicationContext.xml");
 		ArithmeticCalculator arithmeticCalculator = (ArithmeticCalculator) context
 				.getBean("arithmeticCalculator");
-		arithmeticCalculator.add(1, 2);
+	/*	arithmeticCalculator.add(1, 2);*/
 		arithmeticCalculator.sub(4, 3);
-		arithmeticCalculator.mul(2, 3);
-		arithmeticCalculator.div(4, 2);
+	/*	arithmeticCalculator.mul(2, 3);
+		arithmeticCalculator.div(4, -1);*/
 
-		UnitCalculator unitCalculator = (UnitCalculator) context
+	/*	UnitCalculator unitCalculator = (UnitCalculator) context
 				.getBean("unitCalculator");
 		unitCalculator.kilogramToMile(5);
-		unitCalculator.kilogramToPound(10);
+		unitCalculator.kilogramToPound(10);*/
 	}
 
 }

src/main/webapp/WEB-INF/applicationContext.xml

@@ -13,6 +13,7 @@
 	<bean id="unitCalculator"
 		class="com.wwq.calculator.UnitCalculatorImpl" />
 	<bean class="com.wwq.calculator.CalculatorLoggingAspect" />
+	<bean class="com.wwq.calculator.CalculatorValidationAspect"/>