feat: 저장소 구현체, 메시지를 담을 클래스 구현

Author: wonu606

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

@@ -2,9 +2,11 @@
 
 import com.wonu606.app.App;
 import com.wonu606.calculator.storage.Persistence;
+import com.wonu606.calculator.storage.ResultStore;
 import com.wonu606.calculator.strategy.Strategy;
 import com.wonu606.io.Input;
 import com.wonu606.io.Print;
+import com.wonu606.util.Message;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
@@ -13,7 +15,7 @@
 public class CalculatorApp implements App {
 
     private final List<Strategy> strategies = new ArrayList<>();
-    private final Persistence store;
+    private final Persistence store = new ResultStore();
     Input input;
     Print printer;
 
@@ -36,7 +38,7 @@ public void execute(Input input, Print printer) throws IOException {
                     Optional.ofNullable(strategies.get(selection - 1));
             selectedStrategy.ifPresentOrElse(
                     strategy -> strategy.execute(input, printer, store),
-                    () -> new IllegalArgumentException("잘못된 입력입니다."));
+                    () -> new IllegalArgumentException(Message.INVALID_NUMBER));
         }
     }
 }

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

@@ -0,0 +1,36 @@
+package com.wonu606.calculator.storage;
+
+import com.wonu606.calculator.model.CalculationResult;
+import com.wonu606.util.Message;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class ResultStore implements Persistence {
+
+    private final List<CalculationResult> store = new ArrayList<>();
+
+    @Override
+    public void saveResult(CalculationResult calculationResult) {
+        store.add(calculationResult);
+    }
+
+    @Override
+    public CalculationResult findResult(int sequence) {
+        try {
+            return store.get(sequence - 1);
+        } catch (IndexOutOfBoundsException exception) {
+            throw new IllegalArgumentException(Message.INVALID_ORDER);
+        }
+    }
+
+    @Override
+    public List<CalculationResult> findAllResult() {
+        return new ArrayList<>(store);
+    }
+
+    @Override
+    public void clear() {
+        store.clear();
+    }
+}

calculator/src/main/java/com/wonu606/util/Message.java

@@ -0,0 +1,6 @@
+package com.wonu606.util;
+
+public abstract class Message {
+    public static final String INVALID_ORDER = "잘못된 순번입니다.";
+    public static final String INVALID_NUMBER = "잘못된 번호입니다.";
+}

calculator/src/test/java/com/wonu606/storage/ResultStoreTest.java

@@ -5,6 +5,8 @@
 
 import com.wonu606.calculator.model.CalculationResult;
 import com.wonu606.calculator.storage.Persistence;
+import com.wonu606.calculator.storage.ResultStore;
+import com.wonu606.util.Message;
 import java.util.ArrayList;
 import java.util.List;
 import org.junit.jupiter.api.BeforeEach;
@@ -13,7 +15,7 @@
 
 public class ResultStoreTest {
 
-    private Persistence store;
+    private Persistence store = new ResultStore();
 
     @BeforeEach
     void setUp() {
@@ -49,7 +51,7 @@ void testFindNumberLessThan1() {
 
         assertThatThrownBy(() -> store.findResult(0))
                 .isInstanceOf(IllegalArgumentException.class)
-                .hasMessageContaining("잘못된 순번입니다.");
+                .hasMessageContaining(Message.INVALID_ORDER);
     }
 
     @Test
@@ -60,7 +62,7 @@ void testFindNumberMoreThanSize() {
 
         assertThatThrownBy(() -> store.findResult(store.findAllResult().size() + 1))
                 .isInstanceOf(IllegalArgumentException.class)
-                .hasMessageContaining("잘못된 순번입니다.");
+                .hasMessageContaining(Message.INVALID_ORDER);
     }
 
     @Test