1주차 미션 / 서버 3조 이윤희

src/main/java/Ladder.java

@@ -1,8 +1,48 @@
 public class Ladder {
 
-    private final int[][] rows;
+    private final int[][] positions;
 
-    public Ladder(int row, int numberOfPerson) {
-        rows = new int[row][numberOfPerson];
+    public Ladder(int height, int numberOfPerson) {
+        positions = new int[height][numberOfPerson];
+    }
+    public void drawLine(Position pos, int direction) {
+        if(direction == -1){
+            drawLineToLeft(pos);
+        }
+        if(direction == 1){
+            drawLineToRight(pos);
+        }
+    }
+    public void drawLineToLeft(Position pos) {
+        LeftLinePossible(pos);
+        positions[pos.getRow()][pos.getCol()] = -1;
+        positions[pos.getRow()][pos.getCol()-1] = 1;
+    }
+    public void drawLineToRight(Position pos) {
+        RightLinePossible(pos);
+        positions[pos.getRow()][pos.getCol()] = 1;
+        positions[pos.getRow()][pos.getCol()+1] = -1;
+    }
+    public void LeftLinePossible(Position pos) {
+        if(pos.getCol() <= 0 || pos.getCol() > (positions[0].length-1)){
+            throw new IllegalArgumentException("Index Error");
+        }
+        if(positions[pos.getRow()][pos.getCol()-1] != 0 || positions[pos.getRow()][pos.getCol()] != 0){
+            throw new IllegalArgumentException("Over Max Length of Line Error");
+        }
+    }
+    public void RightLinePossible(Position pos) {
+        if(pos.getCol() < 0 || pos.getCol() >= (positions[0].length-1)){
+            throw new IllegalArgumentException("Index Error");
+        }
+        if(positions[pos.getRow()][pos.getCol()+1] != 0 || positions[pos.getRow()][pos.getCol()] != 0){
+            throw new IllegalArgumentException("Over Max Length of Line Error");
+        }
+    }
+    public int run(int pos){
+        for (int i = 0; i < positions.length; i++) { // height
+            pos += positions[i][pos];
+        }
+        return pos;
     }
 }

src/main/java/Position.java

@@ -0,0 +1,16 @@
+public class Position {
+
+    private int row, col;
+
+    public Position(int row, int col) {
+        this.row = row;
+        this.col = col;
+    }
+
+    public int getCol() {
+        return col;
+    }
+    public int getRow() {
+        return row;
+    }
+}

src/test/java/LadderTest.java

@@ -1,5 +1,92 @@
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.*;
 
 class LadderTest {
 
+    @Test
+    void Ladder_init() {
+        int height = 5, numberOfPerson = 5;
+        Ladder ladder = new Ladder(height, numberOfPerson);
+        assertThat(ladder).isNotNull();
+    }
+    @Test
+    void OnePerson(){
+        int height = 5, numberOfPerson = 1;
+        Ladder ladder = new Ladder(height, numberOfPerson);
+
+        int result = ladder.run(0);
+        assertThat(result).isEqualTo(0);
+    }
+    @Test
+    void TwoPerson(){
+        int height = 5, numberOfPerson = 2;
+        Ladder ladder = new Ladder(height, numberOfPerson);
+        ladder.drawLine(new Position(0, 0), 1);
+        ladder.drawLine(new Position(2, 1), -1);
+        ladder.drawLine(new Position(3, 1), -1);
+
+        int result = ladder.run(0);
+        assertThat(result).isEqualTo(1);
+    }
+
+    @Test
+    void ThreePerson(){
+        int height = 5, numberOfPerson = 3;
+        Ladder ladder = new Ladder(height, numberOfPerson);
+        ladder.drawLine(new Position(0, 0), 1);
+        ladder.drawLine(new Position(1, 1), 1);
+        ladder.drawLine(new Position(2, 2), -1);
+        //ladder.drawLine(new Position(3, 1), -1); => 0
+
+        int result = ladder.run(0);
+        assertThat(result).isEqualTo(1);
+    }
+    @Test
+    void FivePerson(){
+        int height = 5, numberOfPerson = 5;
+        Ladder ladder = new Ladder(height, numberOfPerson);
+        ladder.drawLine(new Position(0, 0), 1);
+        ladder.drawLine(new Position(1, 1), 1);
+        ladder.drawLine(new Position(2, 1), -1);
+        ladder.drawLine(new Position(2, 3), -1);
+        ladder.drawLine(new Position(3, 1), 1);
+        ladder.drawLine(new Position(3, 4), -1);
+        ladder.drawLine(new Position(4, 2), 1);
+        ladder.drawLine(new Position(4, 0), 1);
+
+        int result = ladder.run(3); // 2
+        assertThat(result).isEqualTo(0);  // 1
+    }
+    @Test
+    void IndexExceptionCode(){
+        // => Test Fail : Index Error
+        int height = 5, numberOfPerson = 3;
+        Ladder ladder = new Ladder(height, numberOfPerson);
+        ladder.drawLine(new Position(0, 0), 1);
+        ladder.drawLine(new Position(1, 1), 1);
+        ladder.drawLine(new Position(2, 2), 1);
+
+        int result = ladder.run(0);
+        assertThat(result).isEqualTo(1);
+    }
+    @Test
+    void MaxLengthExceptionCode(){
+        // => Test Fail : Over Max Length of Line Error
+        int height = 5, numberOfPerson = 5;
+        Ladder ladder = new Ladder(height, numberOfPerson);
+        ladder.drawLine(new Position(0, 0), 1);
+        ladder.drawLine(new Position(1, 1), 1);
+        ladder.drawLine(new Position(2, 1), -1);
+        ladder.drawLine(new Position(2, 2), -1);
+        ladder.drawLine(new Position(2, 3), -1);
+        ladder.drawLine(new Position(3, 1), 1);
+        ladder.drawLine(new Position(3, 4), -1);
+        ladder.drawLine(new Position(4, 2), 1);
+        ladder.drawLine(new Position(4, 0), 1);
+
+        int result = ladder.run(3); // 2
+        assertThat(result).isEqualTo(0);  // 1
+    }
 }