From 7733b7dffe5a70c578713c34bdbabafee060d80a Mon Sep 17 00:00:00 2001
From: pacien
Date: Mon, 8 Jan 2018 17:49:05 +0100
Subject: Implement board parser and its tests

Signed-off-by: pacien <pacien.trangirard@pacien.net>
---
 src/main/java/fr/umlv/java/wallj/board/Board.java  |  4 +-
 .../java/fr/umlv/java/wallj/board/BoardParser.java | 59 ++++++++++++++++++++--
 src/main/java/fr/umlv/java/wallj/utils/Matrix.java | 32 ++++++++++--
 3 files changed, 87 insertions(+), 8 deletions(-)

(limited to 'src/main/java/fr')

diff --git a/src/main/java/fr/umlv/java/wallj/board/Board.java b/src/main/java/fr/umlv/java/wallj/board/Board.java
index dfcec88..fbe6ad9 100644
--- a/src/main/java/fr/umlv/java/wallj/board/Board.java
+++ b/src/main/java/fr/umlv/java/wallj/board/Board.java
@@ -44,8 +44,8 @@ public final class Board {
 
   private Board(BlockType[][] map) {
     int w = Matrix.getWidth(map), h = Matrix.getHeight(map);
-    this.map = new BlockType[w][h];
-    for (int row = 0; row < w; ++row) System.arraycopy(map[row], 0, this.map[row], 0, h);
+    this.map = new BlockType[h][w];
+    for (int row = 0; row < h; ++row) System.arraycopy(map[row], 0, this.map[row], 0, w);
   }
 
   /**
diff --git a/src/main/java/fr/umlv/java/wallj/board/BoardParser.java b/src/main/java/fr/umlv/java/wallj/board/BoardParser.java
index 77d836f..b7db602 100644
--- a/src/main/java/fr/umlv/java/wallj/board/BoardParser.java
+++ b/src/main/java/fr/umlv/java/wallj/board/BoardParser.java
@@ -1,6 +1,59 @@
 package fr.umlv.java.wallj.board;
 
-public class BoardParser {
-  //TODO
-}
+import fr.umlv.java.wallj.model.BlockType;
+import fr.umlv.java.wallj.utils.Matrix;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.ListIterator;
+import java.util.stream.Collectors;
+
+public final class BoardParser {
+
+  private static Board buildBoard(List<List<BlockType>> map) {
+    if (!Matrix.isShapeValid(map)) throw new IllegalArgumentException("Board must be rectangular.");
+
+    Board.Builder b = new Board.Builder(Matrix.getWidth(map), Matrix.getHeight(map));
+    for (ListIterator<List<BlockType>> line = map.listIterator(); line.hasNext(); )
+      for (ListIterator<BlockType> block = line.next().listIterator(); block.hasNext(); )
+        b.setBlockTypeAt(TileVec2.of(line.previousIndex(), block.nextIndex()), block.next());
+
+    return b.build();
+  }
 
+  private static BlockType parseChar(int c) {
+    switch (c) {
+      case ' ':
+        return BlockType.FREE;
+      case 'W':
+        return BlockType.wALL;
+      case 'T':
+        return BlockType.TRASH;
+      case 'G':
+        return BlockType.GARBAGE;
+      default:
+        return null;
+    }
+  }
+
+  private static List<BlockType> parseLine(String line) {
+    return line.chars()
+           .mapToObj(BoardParser::parseChar)
+           .collect(Collectors.toList());
+  }
+
+  public static Board parse(Path filePath) throws IOException {
+    return buildBoard(Files.lines(filePath)
+                      .filter(s -> !s.isEmpty())
+                      .map(String::trim)
+                      .map(BoardParser::parseLine)
+                      .collect(Collectors.toList()));
+  }
+
+  private BoardParser() {
+    // static class
+  }
+
+}
diff --git a/src/main/java/fr/umlv/java/wallj/utils/Matrix.java b/src/main/java/fr/umlv/java/wallj/utils/Matrix.java
index e23cb2a..e3702bf 100644
--- a/src/main/java/fr/umlv/java/wallj/utils/Matrix.java
+++ b/src/main/java/fr/umlv/java/wallj/utils/Matrix.java
@@ -1,12 +1,14 @@
 package fr.umlv.java.wallj.utils;
 
+import java.util.List;
+
 /**
- * Utility functions for two dimension arrays.
+ * Utility functions for two dimension arrays and lists.
  */
 public final class Matrix {
 
   /**
-   * @param m the matrix
+   * @param m the matrix (2D array)
    * @return the width of the matrix (0 if null)
    */
   public static int getWidth(Object[][] m) {
@@ -14,13 +16,37 @@ public final class Matrix {
   }
 
   /**
-   * @param m the matrix
+   * @param m the matrix (2D array)
    * @return the height of the matrix (0 if null)
    */
   public static int getHeight(Object[][] m) {
     return m != null ? m.length : 0;
   }
 
+  /**
+   * @param m the matrix (2D List)
+   * @return the width of the matrix (0 if null)
+   */
+  public static int getWidth(List<? extends List<?>> m) {
+    return m != null && m.size() > 0 ? m.get(0).size() : 0;
+  }
+
+  /**
+   * @param m the matrix (2D List)
+   * @return the height of the matrix (0 if null)
+   */
+  public static int getHeight(List<? extends List<?>> m) {
+    return m != null ? m.size() : 0;
+  }
+
+  /**
+   * @param l the 2D list to check
+   * @return T(l is a valid matrix, i.e. all sub - arrays are of the same size and l is not null)
+   */
+  public static boolean isShapeValid(List<? extends List<?>> l) {
+    return l != null && l.stream().mapToInt(List::size).allMatch(s -> s == l.get(0).size());
+  }
+
   private Matrix() {
     // static class
   }
-- 
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