feat: 조회와 계산 기능을 담을 인터페이스 구현

Author: wonu606

calculator/src/main/java/com/wonu606/calculator/CalculatorApp.java

@@ -1,21 +1,42 @@
 package com.wonu606.calculator;
 
 import com.wonu606.app.App;
+import com.wonu606.calculator.storage.Persistence;
+import com.wonu606.calculator.strategy.Strategy;
 import com.wonu606.io.Input;
 import com.wonu606.io.Print;
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
 
 public class CalculatorApp implements App {
 
+    private final List<Strategy> strategies = new ArrayList<>();
+    private final Persistence store;
     Input input;
     Print printer;
 
+    public CalculatorApp() {
+        initStrategies();
+    }
+
+    private void initStrategies() {
+        // TODO 조회와 계산 기능을 생성하여 추가해야 함
+    }
+
     public void execute(Input input, Print printer) throws IOException {
         this.input = input;
         this.printer = printer;
 
         while (true) {
             String selection = input.getInput();
+
+            Optional<Strategy> selectedStrategy =
+                    Optional.ofNullable(strategies.get(selection - 1));
+            selectedStrategy.ifPresentOrElse(
+                    strategy -> strategy.execute(input, printer, store),
+                    () -> new IllegalArgumentException("잘못된 입력입니다."));
         }
     }
 }

calculator/src/main/java/com/wonu606/calculator/storage/Persistence.java

@@ -0,0 +1,15 @@
+package com.wonu606.calculator.storage;
+
+import com.wonu606.calculator.model.CalculationResult;
+import java.util.List;
+
+public interface Persistence {
+
+    void saveResult(CalculationResult calculationResult);
+
+    CalculationResult findResult(int sequence);
+
+    List<CalculationResult> findAllResult();
+
+    void clear();
+}

calculator/src/main/java/com/wonu606/calculator/strategy/Strategy.java

@@ -0,0 +1,10 @@
+package com.wonu606.calculator.strategy;
+
+import com.wonu606.calculator.storage.Persistence;
+import com.wonu606.io.Input;
+import com.wonu606.io.Print;
+
+public interface Strategy {
+
+    void execute(Input input, Print printer, Persistence store);
+}