error export implemented and message on error side bar includes column name

src/main/java/ninja/javafx/smartcsv/export/ErrorExport.java

@@ -0,0 +1,71 @@
+package ninja.javafx.smartcsv.export;
+
+import javafx.concurrent.Service;
+import javafx.concurrent.Task;
+import ninja.javafx.smartcsv.fx.table.model.CSVModel;
+import ninja.javafx.smartcsv.validation.ValidationError;
+
+import java.io.File;
+import java.io.StringWriter;
+import java.nio.file.Files;
+import java.util.ResourceBundle;
+
+import static java.text.MessageFormat.format;
+import static ninja.javafx.smartcsv.fx.util.I18nValidationUtil.getI18nValidatioMessage;
+
+/**
+ * this class exports the error messages into a log file
+ */
+@org.springframework.stereotype.Service
+public class ErrorExport extends Service {
+
+    private CSVModel model;
+    private File file;
+    private ResourceBundle resourceBundle;
+    private String csvFilename;
+
+    public void setCsvFilename(String csvFilename) {
+        this.csvFilename = csvFilename;
+    }
+
+    public void setResourceBundle(ResourceBundle resourceBundle) {
+        this.resourceBundle = resourceBundle;
+    }
+
+    public void setModel(CSVModel model) {
+        this.model = model;
+    }
+
+    public void setFile(File file) {
+        this.file = file;
+    }
+
+    @Override
+    protected Task createTask() {
+        return new Task() {
+            @Override
+            protected Void call() throws Exception {
+                try {
+                    StringWriter log = new StringWriter();
+                    log.append(
+                            format(resourceBundle.getString("log.header.message"),
+                                   csvFilename,
+                                   Integer.toString(model.getValidationError().size()))).append("\n\n");
+                    for (ValidationError error:model.getValidationError()) {
+                        log.append(
+                                format(resourceBundle.getString("log.message"),
+                                       error.getLineNumber().toString(),
+                                       error.getColumn(),
+                                       getI18nValidatioMessage(resourceBundle, error))).append("\n");
+                    }
+                    Files.write(file.toPath(), log.toString().getBytes());
+
+                } catch (Throwable ex) {
+                    ex.printStackTrace();
+                }
+                return null;
+            }
+        };
+    }
+
+}