Updated proxy

Author: arkada38

examples/structural_proxy_driver.rs

@@ -0,0 +1,13 @@
+use design_patterns::structural::proxy::driver::{Car, Driver, ProxyCar};
+
+fn main() {
+    println!("Case 1. 16 years old driver.");
+    let car = ProxyCar::new(Driver::new(16));
+    car.drive_car();
+
+    println!();
+
+    println!("Case 1. 21 years old driver.");
+    let car = ProxyCar::new(Driver::new(21));
+    car.drive_car();
+}

src/structural/mod.rs

@@ -16,3 +16,4 @@ pub mod composite;
 pub mod decorator;
 pub mod facade;
 pub mod flyweight;
+pub mod proxy;

src/structural/proxy/driver.rs

@@ -0,0 +1,49 @@
+pub struct Driver {
+    age: u8,
+}
+
+impl Driver {
+    pub fn new(age: u8) -> Driver {
+        Driver { age }
+    }
+
+    pub fn get_age(&self) -> u8 {
+        self.age
+    }
+}
+
+pub trait Car {
+    fn drive_car(&self);
+}
+
+pub struct RealCar {}
+
+impl Car for RealCar {
+    fn drive_car(&self) {
+        println!("Car has been driven!");
+    }
+}
+
+pub struct ProxyCar {
+    driver: Driver,
+    real_car: RealCar,
+}
+
+impl Car for ProxyCar {
+    fn drive_car(&self) {
+        if self.driver.age <= 16 {
+            println!("Sorry, the driver is too young to drive.")
+        } else {
+            self.real_car.drive_car();
+        }
+    }
+}
+
+impl ProxyCar {
+    pub fn new(driver: Driver) -> ProxyCar {
+        ProxyCar {
+            driver,
+            real_car: RealCar {},
+        }
+    }
+}

src/structural/proxy/mod.rs

@@ -0,0 +1,11 @@
+//! # Proxy
+//!
+//! ## Type
+//!
+//! Structural
+//!
+//! ## Description
+//!
+//! Provide a surrogate or placeholder for another object to control access to it.
+
+pub mod driver;