first version of new validation algorithm, that is a lot faster

src/main/java/ninja/javafx/smartcsv/validation/UniqueValidation.java

@@ -0,0 +1,29 @@
+package ninja.javafx.smartcsv.validation;
+
+import java.util.HashMap;
+
+/**
+ * Created by abi on 07.08.2016.
+ */
+public class UniqueValidation implements Validation {
+
+    private HashMap<String, Integer> columnValueMap = new HashMap<>();
+
+    @Override
+    public void check(int row, String value, ValidationError error) {
+        Integer valueInLineNumber = columnValueMap.get(value);
+        if (valueInLineNumber != null) {
+            if (!valueInLineNumber.equals(row)) {
+                valueInLineNumber += 1; // show not 0 based line numbers to user
+                error.add("validation.message.uniqueness", value, valueInLineNumber.toString());
+            }
+        } else {
+            columnValueMap.put(value, row);
+        }
+    }
+
+    @Override
+    public Type getType() {
+        return Type.UNIQUE;
+    }
+}