Refactoring in Position class

src/main/com/paktalin/chess/Position.java

 package com.paktalin.chess;
 
+import com.paktalin.chess.coordinates.Column;
+import com.paktalin.chess.coordinates.Row;
+
 /**
  * Created by Paktalin on 31/05/2018.
  */
 
 public class Position {
 
-    private int row;
-    private char column;
+    private Column column;
+    private Row row;
 
-    private Position(int row, char column) {
+    private Position(Row row, Column column) {
         this.row = row;
         this.column = column;
     }
 
     public static Position create(String positionString) {
-        return create(retrieveRow(positionString), retrieveColumn(positionString));
+        char column = positionString.charAt(0);
+        int row = Character.getNumericValue(positionString.charAt(1)) - 1;
+        return new Position(new Row(row), new Column(column));
     }
 
     static Position create(int row, int column) {
-        return new Position(row, intToChar(column));
-    }
-
-    private static int retrieveRow(String position) {
-        return Integer.parseInt(position.split("")[1]) - 1;
-    }
-
-    private static int retrieveColumn(String position) {
-        char file = position.toCharArray()[0];
-        return charToInt(file);
+        return new Position(new Row(row), new Column(column));
     }
 
     @Override
     public String toString() {
-        return column + "" + (row + 1);
-    }
-
-    private static char intToChar(int i) {
-        return (char)(i + 'a');
-    }
-
-    private static int charToInt(char c) {
-        char firstColumnLetter = 'a';
-        return (int)c - (int)firstColumnLetter;
+        return column.getCharCode() + "" + (row.getIntCode() + 1);
     }
 
     public int getRow() {
-        return row;
+        return row.getIntCode();
     }
 
     public char getColumn() {
-        return column;
+        return column.getCharCode();
     }
 
     public int getIntColumn() {
-        return charToInt(column);
+        return column.getIntCode();
     }
-}
+}
\ No newline at end of file

src/main/com/paktalin/chess/coordinates/Column.java

+package com.paktalin.chess.coordinates;
+
+public class Column extends Row {
+    private char charCode;
+
+    public Column(int intCode) {
+        super(intCode);
+        this.charCode = generateCharCodeFromInt(intCode);
+    }
+
+    public Column(char charCode) {
+        super();
+        this.charCode = charCode;
+        this.intCode = generateIntCodeFromChar(charCode);
+    }
+
+    private int generateIntCodeFromChar(char c) {
+        char firstColumnLetter = 'a';
+        return (int)c - (int)firstColumnLetter;
+    }
+
+    private char generateCharCodeFromInt(int i) {
+        return (char)(i + 'a');
+    }
+
+    public char getCharCode() {
+        return charCode;
+    }
+}

src/main/com/paktalin/chess/coordinates/Row.java

+package com.paktalin.chess.coordinates;
+
+public class Row {
+    int intCode;
+
+    Row() {}
+
+    public Row(int intCode) {
+        this.intCode = intCode;
+    }
+
+    public int getIntCode() {
+        return intCode;
+    }
+}

src/main/com/paktalin/chess/pieces/Piece.java

@@ -11,9 +11,8 @@ import java.util.List;
  */
 
 public abstract class Piece implements Comparable<Piece> {
-    Color color;
     private Position position;
-
+    Color color;
     double strength;
     MoveStrategy moveStrategy;
     char representation;
@@ -33,7 +32,9 @@ public abstract class Piece implements Comparable<Piece> {
         this.position = position;
     }
 
-    public void setStrength(List<Piece> pieces) {}
+    public void setStrength(List<Piece> pieces) {
+
+    }
 
     void setStrength(double strength){
         this.strength = strength;

src/test/com/paktalin/chess/BoardTest.java

@@ -5,7 +5,7 @@ import org.junit.jupiter.api.Test;
 
 import java.util.List;
 
-import static com.paktalin.chess.pieces.Piece.Color.*;
+import static com.paktalin.chess.Color.*;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 /**

src/test/com/paktalin/chess/PositionTest.java

@@ -30,9 +30,9 @@ class PositionTest {
 
     @Test
     void testStrengthByPosition() {
-        verifyStrength(new Bishop(Piece.Color.Black), "b5", 3.0);
-        verifyStrength(new Pawn(Piece.Color.White), "a2", 1.0);
-        verifyStrength(new Pawn(Piece.Color.White), "a3", 0.5);
+        verifyStrength(new Bishop(Color.Black), "b5", 3.0);
+        verifyStrength(new Pawn(Color.White), "a2", 1.0);
+        verifyStrength(new Pawn(Color.White), "a3", 0.5);
         assertEquals(0.5, board.getPieceAtPosition("a2").getStrength());
     }
 

src/test/com/paktalin/chess/pieces/BishopTest.java

 package com.paktalin.chess.pieces;
 
+import com.paktalin.chess.Color;
+
 /**
  * Created by Paktalin on 01/06/2018.
  */
@@ -12,7 +14,7 @@ class BishopTest extends PieceTest {
     }
 
     @Override
-    Piece createPiece(Piece.Color color) {
+    Piece createPiece(Color color) {
         return new Bishop(color);
     }
 

src/test/com/paktalin/chess/pieces/KingTest.java

 package com.paktalin.chess.pieces;
 
+import com.paktalin.chess.Color;
+
 /**
  * Created by Paktalin on 01/06/2018.
  */
@@ -12,7 +14,7 @@ class KingTest extends PieceTest {
     }
 
     @Override
-    Piece createPiece(Piece.Color color) {
+    Piece createPiece(Color color) {
         return new King(color);
     }
 

src/test/com/paktalin/chess/pieces/KnightTest.java

 package com.paktalin.chess.pieces;
 
+import com.paktalin.chess.Color;
+
 /**
  * Created by Paktalin on 01/06/2018.
  */
@@ -12,7 +14,7 @@ class KnightTest extends PieceTest {
     }
 
     @Override
-    Piece createPiece(Piece.Color color) {
+    Piece createPiece(Color color) {
         return new Knight(color);
     }
 

src/test/com/paktalin/chess/pieces/PawnTest.java

 package com.paktalin.chess.pieces;
 
-import static com.paktalin.chess.pieces.Piece.Color.Black;
+import com.paktalin.chess.Color;
+
+import static com.paktalin.chess.Color.Black;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 /**
@@ -15,7 +17,7 @@ class PawnTest extends PieceTest {
     }
 
     @Override
-    Piece createPiece(Piece.Color color) {
+    Piece createPiece(Color color) {
         return new Pawn(color);
     }
 

src/test/com/paktalin/chess/pieces/PieceTest.java

 package com.paktalin.chess.pieces;
 
 import com.paktalin.chess.Board;
+import com.paktalin.chess.Color;
 import com.paktalin.chess.Position;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import static com.paktalin.chess.pieces.Piece.Color.*;
+import static com.paktalin.chess.Color.*;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
@@ -27,7 +28,7 @@ abstract class PieceTest {
     }
 
     abstract void setExpectedRepresentation();
-    abstract Piece createPiece(Piece.Color color);
+    abstract Piece createPiece(Color color);
     abstract void setExpectedStrength();
 
 

src/test/com/paktalin/chess/pieces/QueenTest.java

 package com.paktalin.chess.pieces;
 
+import com.paktalin.chess.Color;
+
 /**
  * Created by Paktalin on 01/06/2018.
  */
@@ -12,7 +14,7 @@ class QueenTest extends PieceTest {
     }
 
     @Override
-    Piece createPiece(Piece.Color color) {
+    Piece createPiece(Color color) {
         return new Queen(color);
     }
 

src/test/com/paktalin/chess/pieces/RookTest.java

 package com.paktalin.chess.pieces;
 
+import com.paktalin.chess.Color;
+
 /**
  * Created by Paktalin on 01/06/2018.
  */
@@ -12,7 +14,7 @@ class RookTest extends PieceTest {
     }
 
     @Override
-    Piece createPiece(Piece.Color color) {
+    Piece createPiece(Color color) {
         return new Rook(color);
     }