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package jodd.aop;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Base aspect class that holds the target instance.
*/
public abstract class Aspect implements InvocationHandler {
private Object target;
public Aspect(Object target) {
this.target = target;
}
/**
* Returns target object.
*/
public final Object getTarget() {
return this.target;
}
/**
* Runs before targets method. Returns {@code true} if target method
* should run.
*/
public abstract boolean before(Object target, Method method, Object[] args);
/**
* Runs after targets method. Returns {@code true} if aspect method should
* return value, otherwise {@code null}.
*/
public abstract boolean after(Object target, Method method, Object[] args);
/**
* Invoked after exception.
*/
public abstract boolean afterException(Object target, Method method, Object[] args, Throwable throwable);
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Object result = null;
if (before(target, method, args)) {
try {
result = method.invoke(target, args);
}
catch (InvocationTargetException e) {
afterException(args, method, args, e.getTargetException());
}
catch (Exception ex) {
throw ex;
}
}
if (after(target, method, args)) {
return result;
}
return null;
}
}