ahucoder · ahucoder · Jun 7, 2025 · Jun 7, 2025
diff --git a/src/main/java/facade/App.java b/src/main/java/facade/App.java
@@ -0,0 +1,24 @@
+package facade;
+
+import facade.dto.TripDetailsDto;
+import facade.facade.TravelFacade;
+
+import java.time.LocalDate;
+
+public class App {
+    public static void main(String[] args) {
+        TripDetailsDto trip = new TripDetailsDto.Builder()
+                .customerName("Alice")
+                .origin("Beijing")
+                .destination("Shanghai")
+                .departureDate(LocalDate.of(2025, 6, 7))
+                .returnDate(LocalDate.of(2025, 6, 8))
+                .build();
+
+        TravelFacade facade = new TravelFacade.Builder()
+                .trip(trip)
+                .build();
+
+        facade.bookAll();
+    }
+}
diff --git a/src/main/java/facade/dto/TripDetailsDto.java b/src/main/java/facade/dto/TripDetailsDto.java
@@ -0,0 +1,57 @@
+package facade.dto;
+
+import lombok.Getter;
+
+import java.time.LocalDate;
+
+@Getter
+public class TripDetailsDto {
+    private final String passengerName;
+    private final LocalDate departureDate;
+    private final LocalDate returnDate;
+    private final String origin;
+    private final String destination;
+
+    private TripDetailsDto(Builder builder) {
+        this.passengerName = builder.customerName;
+        this.departureDate = builder.departureDate;
+        this.returnDate = builder.returnDate;
+        this.origin = builder.origin;
+        this.destination = builder.destination;
+    }
+
+    public static class Builder {
+        private String customerName;
+        private LocalDate departureDate;
+        private LocalDate returnDate;
+        private String origin;
+        private String destination;
+
+        public Builder customerName(String name) {
+            this.customerName = name;
+            return this;
+        }
+        public Builder departureDate(LocalDate date) {
+            this.departureDate = date;
+            return this;
+        }
+        public Builder returnDate(LocalDate date) {
+            this.returnDate = date;
+            return this;
+        }
+        public Builder origin(String origin) {
+            this.origin = origin;
+            return this;
+        }
+        public Builder destination(String dest) {
+            this.destination = dest;
+            return this;
+        }
+        public TripDetailsDto build() {
+            if (departureDate.isAfter(returnDate)) {
+                throw new IllegalArgumentException("Departure must be before return date");
+            }
+            return new TripDetailsDto(this);
+        }
+    }
+}
diff --git a/src/main/java/facade/facade/TravelFacade.java b/src/main/java/facade/facade/TravelFacade.java
@@ -0,0 +1,75 @@
+package facade.facade;
+
+import facade.dto.TripDetailsDto;
+import facade.service.FlightBookingService;
+import facade.service.HotelBookingService;
+import facade.service.PaymentService;
+import facade.service.TaxiBookingService;
+import facade.service.impl.FlightBookingServiceImpl;
+import facade.service.impl.HotelBookingServiceImpl;
+import facade.service.impl.PaymentServiceImpl;
+import facade.service.impl.TaxiBookingServiceImpl;
+
+public class TravelFacade {
+    private final FlightBookingService flightService;
+    private final HotelBookingService hotelService;
+    private final TaxiBookingService taxiService;
+    private final PaymentService paymentService;
+    private final TripDetailsDto trip;
+    private double totalCost;
+
+    private TravelFacade(Builder builder) {
+        this.flightService = new FlightBookingServiceImpl();
+        this.hotelService = new HotelBookingServiceImpl();
+        this.taxiService = new TaxiBookingServiceImpl();
+        this.paymentService = new PaymentServiceImpl();
+        this.trip = builder.trip;
+    }
+
+    public static class Builder {
+        private TripDetailsDto trip;
+
+        public Builder trip(TripDetailsDto trip) {
+            this.trip = trip;
+            return this;
+        }
+
+        public TravelFacade build() {
+            if (trip == null) {
+                throw new IllegalStateException("TripDetails must be provided");
+            }
+            return new TravelFacade(this);
+        }
+    }
+
+    public void bookAll() {
+        System.out.println("Start the itinerary booking process...");
+        // 1. Flight
+        String flightConf = flightService.bookFlight(
+                trip.getPassengerName(), trip.getOrigin(), trip.getDestination(), trip.getDepartureDate());
+        totalCost += 500.0;
+
+        // 2. Hotel
+        String hotelConf = hotelService.bookHotel(
+                trip.getPassengerName(), trip.getDestination(), trip.getDepartureDate(), trip.getReturnDate());
+        totalCost += 300.0;
+
+        // 3. Taxi
+        String taxiConf = taxiService.bookCar(
+                trip.getPassengerName(), trip.getDestination(), trip.getDepartureDate(), trip.getReturnDate());
+        totalCost += 200.0;
+
+        // 4. Pay
+        boolean paid = paymentService.processPayment(trip.getPassengerName(), totalCost);
+        if (!paid) {
+            throw new RuntimeException("Payment failed, booking cancelled");
+        }
+
+        System.out.println("Booking completed! The following is the confirmation information:");
+        System.out.println("Flight info: " + flightConf);
+        System.out.println("Hotel info: " + hotelConf);
+        System.out.println("Taxi info: " + taxiConf);
+        System.out.printf("Total cost: %.2f%n", totalCost);
+    }
+
+}
diff --git a/src/main/java/facade/service/FlightBookingService.java b/src/main/java/facade/service/FlightBookingService.java
@@ -0,0 +1,7 @@
+package facade.service;
+
+import java.time.LocalDate;
+
+public interface FlightBookingService {
+    String bookFlight(String passenger, String from, String to, LocalDate date);
+}
diff --git a/src/main/java/facade/service/HotelBookingService.java b/src/main/java/facade/service/HotelBookingService.java
@@ -0,0 +1,7 @@
+package facade.service;
+
+import java.time.LocalDate;
+
+public interface HotelBookingService {
+    String bookHotel(String passenger, String city, LocalDate from, LocalDate to);
+}
diff --git a/src/main/java/facade/service/PaymentService.java b/src/main/java/facade/service/PaymentService.java
@@ -0,0 +1,5 @@
+package facade.service;
+
+public interface PaymentService {
+    boolean processPayment(String user, double amount);
+}
diff --git a/src/main/java/facade/service/TaxiBookingService.java b/src/main/java/facade/service/TaxiBookingService.java
@@ -0,0 +1,7 @@
+package facade.service;
+
+import java.time.LocalDate;
+
+public interface TaxiBookingService {
+    String bookCar(String passenger, String city, LocalDate from, LocalDate to);
+}
diff --git a/src/main/java/facade/service/impl/FlightBookingServiceImpl.java b/src/main/java/facade/service/impl/FlightBookingServiceImpl.java
@@ -0,0 +1,15 @@
+package facade.service.impl;
+
+import facade.service.FlightBookingService;
+
+import java.time.LocalDate;
+import java.util.UUID;
+
+public class FlightBookingServiceImpl implements FlightBookingService {
+    @Override
+    public String bookFlight(String passenger, String from, String to, LocalDate date) {
+        String flightInfo = STR."FLIGHT-\{UUID.randomUUID()}";
+        System.out.printf("[%s] booking %s->%s flight for %s, date: %s%n", flightInfo, from, to, passenger, date);
+        return flightInfo;
+    }
+}
diff --git a/src/main/java/facade/service/impl/HotelBookingServiceImpl.java b/src/main/java/facade/service/impl/HotelBookingServiceImpl.java
@@ -0,0 +1,16 @@
+package facade.service.impl;
+
+import facade.service.HotelBookingService;
+
+import java.time.LocalDate;
+import java.util.UUID;
+
+public class HotelBookingServiceImpl implements HotelBookingService {
+    @Override
+    public String bookHotel(String passenger, String city, LocalDate from, LocalDate to) {
+        String hotelInfo = STR."HOTEL-\{UUID.randomUUID()}";
+        System.out.printf("[%s] booking hotel in %s for %s, checkin: %s, checkout: %s%n",
+                hotelInfo, city, passenger, from, to);
+        return hotelInfo;
+    }
+}
diff --git a/src/main/java/facade/service/impl/PaymentServiceImpl.java b/src/main/java/facade/service/impl/PaymentServiceImpl.java
@@ -0,0 +1,11 @@
+package facade.service.impl;
+
+import facade.service.PaymentService;
+
+public class PaymentServiceImpl implements PaymentService {
+    @Override
+    public boolean processPayment(String user, double amount) {
+        System.out.printf("Processing payment for %s, amount: %.2f%n", user, amount);
+        return true;
+    }
+}
diff --git a/src/main/java/facade/service/impl/TaxiBookingServiceImpl.java b/src/main/java/facade/service/impl/TaxiBookingServiceImpl.java
@@ -0,0 +1,15 @@
+package facade.service.impl;
+
+import facade.service.TaxiBookingService;
+
+import java.time.LocalDate;
+import java.util.UUID;
+
+public class TaxiBookingServiceImpl implements TaxiBookingService {
+    @Override
+    public String bookCar(String passenger, String city, LocalDate from, LocalDate to) {
+        String taxiInfo = STR."CAR-\{UUID.randomUUID()}";
+        System.out.printf("[%s] booking taxi for %s in %s, from: %s, to: %s%n", taxiInfo, passenger, city, from, to);
+        return taxiInfo;
+    }
+}