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Merged
javaConductor merged 1 commit into from
Aug 30, 2022
Merged

validate grid #1

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94 changes: 31 additions & 63 deletions src/main/java/org/collins/FindPathApplication.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,10 @@

import org.collins.model.Point;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
Expand All @@ -11,80 +15,44 @@ public class FindPathApplication {
static PathFinder pathFinder = new PathFinder();

public static void main(String[] args) {
// get filename from the args
if (args.length < 1)
return;
String filename = args[0];
List<String> grid = null;

try {
// read grid
grid = Files.readAllLines(new File(filename).toPath(), Charset.defaultCharset());
} catch (IOException e) {
e.printStackTrace();
}

List<String> plane1 = new ArrayList<>();
plane1.add(" ");
plane1.add(" ");
plane1.add(" ");
plane1.add(" #########");
plane1.add(" ");

List<String> plane2 = new ArrayList<>();
plane2.add(" # ");
plane2.add(" # ");
plane2.add(" # ");
plane2.add(" ");

List<String> plane3 = new ArrayList<>();
plane3.add(" # ");
plane3.add(" # #");
plane3.add(" #");
plane3.add(" ");
plane3.add("# ##");
plane3.add(" ");

List<String> plane4 = new ArrayList<>();
plane4.add(" # ");
plane4.add("# #");
plane4.add("## #");
plane4.add(" ");
plane4.add("## #");
plane4.add("# ");

List<String> plane5 = new ArrayList<>();
plane5.add(" # ");
plane5.add(" # ");
plane5.add(" # ");
plane5.add(" ");
plane5.add("# ");

List<String> plane6 = new ArrayList<>();
plane6.add("____#");
plane6.add("###_#");
plane6.add("____#");
plane6.add("____#");
plane6.add("_____");

testPlane(plane1);
System.out.println("----------------------------------------");
testPlane(plane2);
System.out.println("----------------------------------------");
testPlane(plane3);
System.out.println("----------------------------------------");
testPlane(plane4);
System.out.println("----------------------------------------");
testPlane(plane5);
System.out.println("----------------------------------------");
testPlane(plane6);
System.out.println("----------------------------------------");
if (grid.isEmpty()){
System.out.printf("grid is empty: %s%n", filename);
return;
}
testGrid(grid);
System.out.println("_".repeat(grid.get(0).length()*2));
}

static void testPlane(List<String> plane) {
List<Point> result = pathFinder.findPath(plane);
static void testGrid(List<String> grid) {
List<Point> result = pathFinder.findPath(grid);
if (result != null) {
List<String> newPlane = printResultsPlane(plane, result);
newPlane
List<String> newGrid = printResultsGrid(grid, result);
newGrid
.forEach(row -> System.out.printf("｜%s｜\n", row));
}
}

static List<String> printResultsPlane(List<String> plane, List<Point> results) {
static List<String> printResultsGrid(List<String> grid, List<Point> results) {
System.out.printf("%d steps.\n", results.size());
for (Point point : results) {
StringBuilder sb = new StringBuilder(plane.get(point.getY()));
StringBuilder sb = new StringBuilder(grid.get(point.getY()));
sb.setCharAt(point.getX(), '⭕');
plane.set(point.getY(), sb.toString());
grid.set(point.getY(), sb.toString());
}
return plane.stream()
return grid.stream()
.map(s -> s.replace(" ", "\uD83D\uDD34"))
.map(s -> s.replace("_", "\uD83D\uDD34"))
.map(s -> s.replace("#", "\uD83D\uDFE5"))
Expand Down
49 changes: 29 additions & 20 deletions src/main/java/org/collins/PathFinder.java
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Original file line number Diff line number Diff line change
Expand Up @@ -7,30 +7,30 @@

public class PathFinder {

public List<Point> findPath(List<String> plane) {
if (plane.isEmpty())
public List<Point> findPath(List<String> grid) {
if (grid.isEmpty())
return null;

if (!isPlaneRectangular(plane)){
System.out.println("bad plane: all rows not same length");
if (!isGridRectangular(grid)){
System.out.println("bad grid: all rows not same length");
return null;
}

Point start = new Point(0, 0);
Point end = new Point(plane.get(0).length() - 1, plane.size() - 1);
Point end = new Point(grid.get(0).length() - 1, grid.size() - 1);

return _findPath(plane, start, end, List.of());
return _findPath(grid, start, end, List.of());
}

private List<Point> _findPath(List<String> plane, Point start, Point end, List<Point> path) {
private List<Point> _findPath(List<String> grid, Point start, Point end, List<Point> path) {
// base case
if (start.equals(end)) {
path.add(end);
return path;
}

// is this a dead end
if (plane.get(start.getY()).charAt(start.getX()) == '#') {
if (grid.get(start.getY()).charAt(start.getX()) == '#') {
return null;
}

Expand All @@ -42,25 +42,34 @@ private List<Point> _findPath(List<String> plane, Point start, Point end, List<P
Point right = new Point(start.getX() + 1, start.getY());
Point down = new Point(start.getX(), start.getY() + 1);

List<Point> downResult = null;
// can we go down
if (down.getY() < plane.size()) {
List<Point> downResult = _findPath(plane, down, end, newPath);
if (downResult != null) {
return downResult;
}
if (down.getY() < grid.size()) {
downResult = _findPath(grid, down, end, newPath);
}

List<Point> rightResult = null;
// can we go right
if (right.getX() < plane.get(0).length()) {
List<Point> rightResult = _findPath(plane, right, end, newPath);
if (right.getX() < grid.get(0).length()) {
rightResult = _findPath(grid, right, end, newPath);
}

if (rightResult == null){
return downResult;
}
if(downResult == null){
return rightResult;
}
return null;

if (downResult.size() < rightResult.size()){
return downResult;
}

return rightResult;
}

boolean isPlaneRectangular(List<String> plane) {
int firstLen = plane.get(0).length();
return plane.stream()
boolean isGridRectangular(List<String> grid) {
int firstLen = grid.get(0).length();
return grid.stream()
.allMatch(s -> s.length() == firstLen);
}

Expand Down
11 changes: 11 additions & 0 deletions src/main/resources/grid1.txt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
___________________________
______###########__________
_#### #########__________
_____## #########__________
______# ########__________
______## #######__________
______### #######__________
______### #####__________
______##### #####__________
___________________________
___________________________
11 changes: 11 additions & 0 deletions src/main/resources/grid2.txt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
______###########__________
______###########__________
#####_ #########__________
_____## #########__________
______# ########__________
______## #######__________
______### #######__________
______### #####__________
______##### #####__________
___________________________
___________________________