Vaadin excel export with converter values - vaadin

Question

I'm trying to export an Excel corresponding to a FilterTable using Vaadin TableExport. That Filtertable has some columns storing Dates and other class type elements, so I'm using setConverter function to print them as specific Strings:
filerTable.setConverter("dateColumn", dateConverter);
filerTable.setConverter("myClassColumn", myClassConverter);
dateConverter and myClassConverter are instances of some classes to print that column values as Strings.
The problem comes when I want to export the table as an Excel: That setConverter conversions are not being applied to the output file. For example, date cells are being exported as string ('42741,0080787037' instead of '06/01/17 0:11'). The code section to export the Excel file is:
ExcelExport exp = new ExcelExport(new CustomTableHolder(filerTable), "excel.xls");
exp.setRowHeaders(true);
exp.export();
Is there any way to export the table exactly as shown, having applied setConverter function?

Answer 1

Looking at the add-on sources, it seems that this feature is supported but 2 things have to happen in order for it to work:
you have to use a PropertyFormatTable (nothing fancy, just a wrapper over table for this custom purpose)
set the setUseTableFormatPropertyValue(true) on the ExcelExport
Code:
public class ExcelExportTableComponent extends VerticalLayout {
public ExcelExportTableComponent() {
// basic table configuration
Table table = new PropertyFormatTable();
BeanItemContainer<Person> itemContainer = new BeanItemContainer<>(Person.class);
table.setContainerDataSource(itemContainer);
table.setConverter("age", new AgeConverter());
// add some dummy data to the table
Random random = new Random();
for (int i = 0; i < 10; i++) {
itemContainer.addItem(new Person("Name " + i, "Surname " + i, random.nextInt(99) + 1));
}
// add components to the layout
addComponent(table);
addComponent(new Button("Export to excel", event -> {
ExcelExport excelExport = new ExcelExport(table);
excelExport.setUseTableFormatPropertyValue(true);
excelExport.excludeCollapsedColumns();
excelExport.setReportTitle("Demo Report");
excelExport.export();
}));
}
// basic bean for data binding
public static class Person {
private String name;
private String surname;
private int age;
public Person(String name, String surname, int age) {
this.name = name;
this.surname = surname;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSurname() {
return surname;
}
public void setSurname(String surname) {
this.surname = surname;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
// custom converter
private static class AgeConverter implements Converter<String, Integer> {
#Override
public Integer convertToModel(String value, Class<? extends Integer> targetType, Locale locale) throws ConversionException {
return Integer.valueOf(value.substring(0, value.indexOf(" years")));
}
#Override
public String convertToPresentation(Integer value, Class<? extends String> targetType, Locale locale) throws ConversionException {
return String.valueOf(value) + " years";
}
#Override
public Class<Integer> getModelType() {
return Integer.class;
}
#Override
public Class<String> getPresentationType() {
return String.class;
}
}
}
Output: