Implementing hashing capabilities to the Board class.

This commit is contained in:
Jonathan Turner 2024-02-03 11:50:06 -05:00
parent a07e2098b0
commit a264075c1f

View File

@ -1,5 +1,7 @@
package Assignments.A1.models; package Assignments.A1.models;
import java.util.Arrays;
/** /**
* This class keeps track of the current state (whether in permutation or not) of the board. * This class keeps track of the current state (whether in permutation or not) of the board.
* *
@ -8,7 +10,7 @@ package Assignments.A1.models;
*/ */
public class Board { public class Board {
private final Piece[] pieces; private Piece[] pieces;
/** /**
* Default constructor that generates the solved board. * Default constructor that generates the solved board.
@ -26,17 +28,23 @@ public class Board {
/** /**
* Constructor used to create a board with a pre-provided board. * Constructor used to create a board with a pre-provided board.
* *
* @precondition board.length == 9 * @precondition board != null
* @postcondition a board is created with given locations * @postcondition a board is created with given locations
* *
* @param board the provided state of the board. * @param board the provided state of the board.
*/ */
public Board(Piece[] board) { public Board(Board board) {
if (board.length != 9) { if (board == null) {
throw new IllegalArgumentException("The board must be a array size of 9."); throw new IllegalArgumentException("The board must be valid an initialized.");
} }
this.pieces = board; 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));
} }
}
}
/** /**
* Checks the status of a place on the board. If the location is taken or not. * Checks the status of a place on the board. If the location is taken or not.
@ -88,6 +96,103 @@ public class Board {
throw new IllegalStateException("The state of the board must have 1 empty space."); 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;
}
/**
*
* @return
*/
@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. */ /* Private Methods Below. End of Java Docs. */