Data commit

Task/CSV-data-manipulation/Java/csv-data-manipulation-3.java

@@ -0,0 +1,104 @@
+import java.io.*;
+import java.awt.Point;
+import java.util.HashMap;
+import java.util.Scanner;
+
+public class CSV {
+
+    private HashMap<Point, String> _map = new HashMap<Point, String>();
+    private int _cols;
+    private int _rows;
+
+    public void open(File file) throws FileNotFoundException, IOException {
+        open(file, ',');
+    }
+
+    public void open(File file, char delimiter)
+            throws FileNotFoundException, IOException {
+        Scanner scanner = new Scanner(file);
+        scanner.useDelimiter(Character.toString(delimiter));
+
+        clear();
+
+        while(scanner.hasNextLine()) {
+            String[] values = scanner.nextLine().split(Character.toString(delimiter));
+
+            int col = 0;
+            for ( String value: values ) {
+                _map.put(new Point(col, _rows), value);
+                _cols = Math.max(_cols, ++col);
+            }
+            _rows++;
+        }
+        scanner.close();
+    }
+
+    public void save(File file) throws IOException {
+        save(file, ',');
+    }
+
+    public void save(File file, char delimiter) throws IOException {
+        FileWriter fw = new FileWriter(file);
+        BufferedWriter bw = new BufferedWriter(fw);
+
+        for (int row = 0; row < _rows; row++) {
+            for (int col = 0; col < _cols; col++) {
+                Point key = new Point(col, row);
+                if (_map.containsKey(key)) {
+                    bw.write(_map.get(key));
+                }
+
+                if ((col + 1) < _cols) {
+                    bw.write(delimiter);
+                }
+            }
+            bw.newLine();
+        }
+        bw.flush();
+        bw.close();
+    }
+
+    public String get(int col, int row) {
+        String val = "";
+        Point key = new Point(col, row);
+        if (_map.containsKey(key)) {
+            val = _map.get(key);
+        }
+        return val;
+    }
+
+    public void put(int col, int row, String value) {
+        _map.put(new Point(col, row), value);
+        _cols = Math.max(_cols, col+1);
+        _rows = Math.max(_rows, row+1);
+    }
+
+    public void clear() {
+        _map.clear();
+        _cols = 0;
+        _rows = 0;
+    }
+
+    public int rows() {
+        return _rows;
+    }
+
+    public int cols() {
+        return _cols;
+    }
+
+    public static void main(String[] args) {
+        try {
+            CSV csv = new CSV();
+
+            csv.open(new File("test_in.csv"));
+            csv.put(0, 0, "Column0");
+            csv.put(1, 1, "100");
+            csv.put(2, 2, "200");
+            csv.put(3, 3, "300");
+            csv.put(4, 4, "400");
+            csv.save(new File("test_out.csv"));
+        } catch (Exception e) {
+        }
+    }
+}