Board Class : remove magic numbers + get ride of duplicated code

1 files changed, 32 insertions, 28 deletions

diff --git a/src/ch/epfl/xblast/server/Board.java b/src/ch/epfl/xblast/server/Board.java
index 2cbf380..d47bdd3 100644
--- a/src/ch/epfl/xblast/server/Board.java
+++ b/src/ch/epfl/xblast/server/Board.java
@@ -14,6 +14,33 @@ import java.util.List;
  * @author Timothée FLOURE (257420)
  */
 public final class Board {
+    private static final int BLOCKS_LIST_SIZE = 195;
+    private static final int BOARD_ROWS = 13;
+    private static final int BOARD_COLUMNS = 15;
+    private static final int INNER_BOARD_ROWS = BOARD_ROWS - 2;
+    private static final int INNER_BOARD_COLUMNS = BOARD_COLUMNS - 2;
+    private static final int QUADRANT_ROWS = 6;
+    private static final int QUADRANT_COLUMNS = 7;
+
+    /**
+     * Throw an exeption if the matrix does not have the given number of rows/columns.
+     *
+     * @param matrix the tested matrix
+     * @param rows the expected number of rows
+     * @param columns the expected number of columns
+     * @throws IllegalArgumentException if the matrix does not comply with the given sizes.
+     */
+    private static void checkBlockMatrix(List<List<Block>> matrix, int rows, int columns) {
+        if (matrix.size() != rows) {
+            throw new IllegalArgumentException();
+        } else {
+            for (int i = 0; i < rows; i++) {
+                if (matrix.get(i).size() != columns) {
+                    throw new IllegalArgumentException();
+                }
+            }
+        }
+    }
 
     /**
      * List containing all the blocks of the board.
@@ -27,7 +54,7 @@ public final class Board {
      * @throws IllegalArgumentException if the blocks is not composed of 195 elements
      */
     public Board(List<Sq<Block>> blocks) {
-        if (blocks.size() != 195) {
+        if (blocks.size() != BLOCKS_LIST_SIZE) {
             throw new IllegalArgumentException();
         }
         this.blocks = blocks;
@@ -41,18 +68,10 @@ public final class Board {
      * @throws IllegalArgumentException if rows is not 13*15
      */
     public static Board ofRows(List<List<Block>> rows) {
-        if (rows.size() != 13) {
-            throw new IllegalArgumentException();
-        }
-
+        checkBlockMatrix(rows, BOARD_ROWS, BOARD_COLUMNS);
         List<Sq<Block>> blocksSequence = new ArrayList<>();
 
         for (int i = 0; i < rows.size(); i++) {
-
-            if (rows.get(i).size() != 15) {
-                throw new IllegalArgumentException();
-            }
-
             for (int j = 0; j < rows.get(i).size(); j++) {
                 blocksSequence.add(Sq.constant(rows.get(i).get(j)));
             }
@@ -69,22 +88,15 @@ public final class Board {
      * @throws IllegalArgumentException if innerbLocks is not 11*13
      */
     public static Board ofInnerBlocksWalled(List<List<Block>> innerBlocks) {
-        if (innerBlocks.size() != 11) {
-            throw new IllegalArgumentException();
-        }
-
+        checkBlockMatrix(innerBlocks, INNER_BOARD_ROWS, INNER_BOARD_COLUMNS);
         List<List<Block>> rowsList = new ArrayList<>();
         List<Block> wallLine = new ArrayList<>();
 
-        for (int i = 0; i < 15; i++) {
+        for (int i = 0; i < BOARD_COLUMNS; i++) {
             wallLine.add(Block.INDESTRUCTIBLE_WALL);
         }
 
         for (int i = 0; i < innerBlocks.size(); i++) {
-            if (innerBlocks.get(i).size() != 13) {
-                throw new IllegalArgumentException();
-            }
-
             List<Block> row = innerBlocks.get(i);
             row.add(0, Block.INDESTRUCTIBLE_WALL);
             row.add(Block.INDESTRUCTIBLE_WALL);
@@ -106,19 +118,11 @@ public final class Board {
      * @throws IllegalArgumentException if quadrantNWBlocks is not 6*7
      */
     public static Board ofQuadrantNWBlocksWalled(List<List<Block>> quadrantNWBlocks) {
-        if (quadrantNWBlocks.size() != 6) {
-            throw new IllegalArgumentException();
-        }
-
+        checkBlockMatrix(quadrantNWBlocks, QUADRANT_ROWS, QUADRANT_COLUMNS);
         List<List<Block>> rowsList = new ArrayList<>();
-
         List<List<Block>> halfInnerBoard = Lists.mirrored(quadrantNWBlocks);
 
         for (int i = 0; i < halfInnerBoard.size(); i++) {
-            if (halfInnerBoard.get(i).size() != 7) {
-                throw new IllegalArgumentException();
-            }
-
             rowsList.add(Lists.mirrored(halfInnerBoard.get(i)));
         }
         return ofInnerBlocksWalled(rowsList);