Adding CheckInput for a matrix with basic checks

src/main/java/com/ugsbo/matrixcalc/MatrixCalcController.java

@@ -3,6 +3,8 @@ package com.ugsbo.matrixcalc;
 import javafx.fxml.FXML;
 import javafx.scene.control.*;
 import javafx.scene.text.Text;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 public class MatrixCalcController {
 
@@ -28,12 +30,40 @@ public class MatrixCalcController {
     @FXML
     public void initialize() {
         multiplyButton.setOnMouseClicked((event) -> {
+            String matrixA = matrixATextArea.getText();
+            String matrixB = matrixBTextArea.getText();
+            if (checkInput(matrixA)) {
                 // TODO matrixATextArea and matrixBTextArea need to be parsed to double[][] do
                 // this in an extern Methode maybe an extern class.
                 // MatrixCalcMath math = new MatrixCalcMath();
                 // math.matrixMultiplication(matrixATextArea, matrixATextArea);
-            System.out.println(event);
+            }
+            // System.out.println(matrixATextArea.getText());
         });
     }
 
+    public boolean checkInput(String matrix) {
+        boolean isMatched = false;
+        if (matrix.length() == 0) {
+            throw new IllegalArgumentException("Please insert a Matrix");
+        }
+
+        // Matches digits witch following spaces 1 to 3 times
+        String row1 = "(\\d*\\u0020*){1,3}";
+        // Matches newlineCurrierReturn followed by digits witch following spaces 1 to
+        // 3times
+        String row2 = "(\\n){0,3}(\\d*\\u0020*){0,3}";
+        String row3 = "(\\n){0,3}(\\d*\\u0020*){0,3}";
+
+        // TODO get the input check more stricktly missing matrix slots are allowed.
+
+        Pattern p = Pattern.compile(row1 + row2 + row3);
+        Matcher m = p.matcher(matrix);
+
+        isMatched = m.matches();
+
+        // System.out.println(isMatched);
+        return isMatched;
+    }
+
 }

src/test/java/com/ugsbo/matrixcalc/MatrixInputcheckTest.java

@@ -0,0 +1,49 @@
+package com.ugsbo.matrixcalc;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+/**
+ * Tests how well worng input can be determent.
+ */
+public class MatrixInputcheckTest {
+
+    @Test(expected = IllegalArgumentException.class)
+    public void inputEmptySouldThrowAIllegalArgumentException() {
+     MatrixCalcController contr = new MatrixCalcController();
+     String input = "";
+
+     contr.checkInput(input);
+    }
+
+    @Test
+    public void checkIfA1by3MatrixIsMatched(){
+     MatrixCalcController contr = new MatrixCalcController();
+     String input = "1 2 3";
+
+     boolean result = contr.checkInput(input);
+
+     assertTrue("The 1 by 3 Matrix was not Matched but it should be.", result);
+    }
+
+    @Test
+    public void checkIfA2by3MatrixIsMatched(){
+     MatrixCalcController contr = new MatrixCalcController();
+     String input = "1 2 3\n1 2 3";
+
+     boolean result = contr.checkInput(input);
+
+     assertTrue("The 2 by 3 Matrix was not Matched but it should be.", result);
+    }
+
+    @Test
+    public void checkIfA3by3MatrixIsMatched(){
+     MatrixCalcController contr = new MatrixCalcController();
+     String input = "1 2 3\n1 2 3\n1 2 3";
+
+     boolean result = contr.checkInput(input);
+
+     assertTrue("The 3 by 3 Matrix was not Matched but it should be.", result);
+    }
+}