src/Assignments/A1/models/Board.java

@@ -1,7 +1,5 @@
 package Assignments.A1.models;
 
-import java.util.Arrays;
-
 /**
  * This class keeps track of the current state (whether in permutation or not) of the board.
  *
@@ -10,7 +8,7 @@ import java.util.Arrays;
  */
 public class Board {
 
-    private Piece[] pieces;
+    private final Piece[] pieces;
 
     /**
      * Default constructor that generates the solved board.
@@ -28,24 +26,18 @@ public class Board {
     /**
      * Constructor used to create a board with a pre-provided board.
      *
-     * @precondition board != null
+     * @precondition board.length == 9
      * @postcondition a board is created with given locations
      *
      * @param board the provided state of the board.
      */
-    public Board(Board board) {
-        if (board == null) {
-            throw new IllegalArgumentException("The board must be valid an initialized.");
-        }
-        this.pieces = new Piece[9];
-        for (int index = 0; index < 9; index++) {
-            if (board.getPiece(index) != null) {
-                this.pieces[index] = new Piece(board.getPiece(index));
-            }
+    public Board(Piece[] board) {
+        if (board.length != 9) {
+            throw new IllegalArgumentException("The board must be a array size of 9.");
         }
+        this.pieces = board;
     }
 
-
     /**
      * Checks the status of a place on the board. If the location is taken or not.
      *
@@ -96,130 +88,6 @@ public class Board {
         throw new IllegalStateException("The state of the board must have 1 empty space.");
     }
 
-    /**
-     * Takes two values on the board and swaps them if possible.
-     *
-     * @precondition board.get(first).validMove(second) == true
-     *            || board.get(second).validMove(first) == true
-     * @postcondition the values are swapped
-     *
-     * @param first the first index of the values being swapped
-     * @param second the second index of the values being swapped
-     * @return if the values were swapped or not.
-     */
-    public boolean swap(int first, int second) {
-        // Checks if the first piece is empty and the second is not.
-        if (this.pieces[first] == null && this.pieces[second] != null) {
-            // Checks if the moves are valid
-            if (this.pieces[second].validMove(first, this)) {
-                // Swaps the values
-                this.pieces[first] = this.pieces[second];
-                this.pieces[second] = null;
-                return true; // Successful Swap
-            }
-        } else if (this.pieces[second] == null && this.pieces[first] != null) { // Checks the inverse.
-            // Checks if the moves are valid
-            if (this.pieces[first].validMove(second, this)) {
-                // Swaps the values
-                this.pieces[second] = this.pieces[first];
-                this.pieces[first] = null;
-                return true; // Successful Swap
-            }
-        }
-        return false;
-    }
-
-    /**
-     * Gets the pieces in order in a single array of size 8.
-     *
-     * @precondition none
-     * @postcondition none
-     *
-     * @return the ordered list of values.
-     */
-    public Piece[] getPiecesInOrder() {
-        Piece[] ordered = new Piece[8];
-        boolean foundSpace = false;
-        for (Piece curr : this.pieces) {
-            if (curr == null) {
-                foundSpace = true;
-            } else if (!foundSpace) {
-                ordered[curr.getLoc()] = curr;
-            } else {
-                ordered[curr.getLoc()-1] = curr;
-            }
-        }
-        return ordered;
-    }
-
-    /**
-     * Hashes the board by adding the pieces to an array and hashes the array.
-     *
-     * @precondition none
-     * @postcondition none
-     *
-     * @return the hash of the board.
-     */
-    @Override
-    public int hashCode() {
-        int[] hashValues = new int[9];
-
-        for (int i = 0; i < 9; i++) {
-            if (this.pieces[i] != null) {
-                hashValues[i] = this.pieces[i].getValue();
-            } else {
-                hashValues[i] = 0;
-            }
-        }
-
-        return Arrays.hashCode(hashValues);
-    }
-
-    /**
-     * Checks if this and the other object are the same.
-     * @precondition none
-     * @postcondition they are compared.
-     *
-     * @param o the other object.
-     * @return if they are the same, True
-     *         if they are not,      False
-     */
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) {
-            return true;
-        }
-        if (o == null) {
-            return false;
-        }
-        if (this.getClass() != o.getClass()) {
-            return false;
-        }
-        Board other = (Board) o;
-        for (int i = 0; i < 9; i++) {
-            if (this.pieces[i].getValue() != other.pieces[i].getValue()
-                || this.pieces[i].getLoc() != other.pieces[i].getLoc()) {
-                return false;
-            }
-        }
-        return true;
-    }
-
-    /**
-     * Specifies a way of printing out the board with its current state.
-     * @return the current state formatted.
-     */
-    @Override
-    public String toString() {
-        String result = "";
-        for (int i = 0; i < 9; i++) {
-            result += i + " ";
-            if ((i+1) % 3 == 0) {
-                result += "\n";
-            }
-        }
-        return result;
-    }
 
     /* Private Methods Below. End of Java Docs. */
 
@@ -227,4 +95,4 @@ public class Board {
     private boolean invalidLocation(int loc) {
         return (loc < 0 || loc > 8);
     }
-}
+}

src/Assignments/A1/models/Piece.java

@@ -25,26 +25,11 @@ public class Piece {
         if (value < 1 || value > 8) {
             throw new IllegalArgumentException("The piece value is not valid. Valid Range: 1 <= Value <= 8");
         }
+
         this.setLoc(loc);
         this.value = value;
     }
 
-    /**
-     * Creates a new piece from an existing piece.
-     *
-     * @precondition piece != null
-     * @postcondition a copied piece is created.
-     *
-     * @param piece the piece being copied
-     */
-    public Piece(Piece piece) {
-        if (piece == null) {
-            throw new IllegalArgumentException("The piece cannot be null.");
-        }
-        this.loc = piece.getLoc();
-        this.value = piece.getValue();
-    }
-
     /**
      * Moves the piece to a new location.
      *

src/Assignments/A1/resources/Constants.java

@@ -1,8 +0,0 @@
-package Assignments.A1.resources;
-
-public class Constants {
-
-    /* Used to prevent DFS from going down only 1 branch */
-    public static final int MAX_DEPTH = 100;
-
-}