I’m trying to create a form based on a particular class and in this class some variables are enums.
As a consequence I followed this topic(
https://vaadin.com/forum#!/thread/4516099 ) which shows how to display a special field for these variables.
Thing is, while it does work with
MyEnum enum;
It doesn’t with
MyEnum enums;
And I constantly get
Unable to build a field of type com.vaadin.ui.OptionGroup for editing [Lcom.bnpparibas.eqd.common.job.PrsJobStatus; at com.vaadin.server.VaadinService.handleExceptionDuringRequest(VaadinService.java:1460) at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1414) at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:305)
...
Which indeed shows that we can’t build an OptionGroup with a array of values.
That’s why I tried with the other AbstractSelect components, such as :
//The class I want a form based on
public class MyTestClass {
private String value;
private MyEnum myEnum;
private MyEnum[] myEnums;
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
public MyEnum getMyEnum() {
return myEnum;
}
public void setMyEnum(MyEnum myEnum) {
this.myEnum = myEnum;
}
public MyEnum getMyEnums() {
return myEnums;
}
public void setMyEnums(MyEnum myEnums) {
this.myEnums = myEnums;
}
}
//The enum I want displayed as a selector component
public enum MyEnum {
ONE, TWO, THREE
}
[code]
//The builder of my form
public class MyFormBuilder {
private final BeanFieldGroup<T> binder;
private final List<String> fields = new ArrayList<String>();
public MyFormBuilder(String name, T bean) {
binder = new BeanFieldGroup(bean.getClass());
binder.setItemDataSource(bean);
}
public MyFormBuilder<T> addProperty(String name) {
fields.add(name);
return this;
}
public FormLayout build() {
FormLayout form = new FormLayout();
for (String field : fields) {
if (field.equals("myEnum")) {
form.addComponent(binder.buildAndBind("MyEnum", "myEnum", OptionGroup.class));
}
//this one throws an exception
else if (field.equals("myEnums")) {
form.addComponent(binder.buildAndBind("MyEnums", "myEnums", OptionGroup.class));
}
else {
form.addComponent(binder.buildAndBind(field));
}
}
// **** IRRELEVANT CODE **** //
return form;
}
}
[/code][code]
//How I create the form
MyTestClass test = new MyTestClass();
TitanFormBuilder<MyTestClass> builder = new TitanFormBuilder<MyTestClass>("test", test);
builder.addProperty("value");
builder.addProperty("myEnum");
builder.addProperty("myEnums");
[/code]I want to be able to choose value(s) from a component such as OptionGroup that has been fed with MyEnum values.
Okay, Vaadin doesn’t (and can’t) by default know what to do with an array-typed property, so you’ll have to tell it.
First off, if possible, consider using a Set instead of a MyEnum as the type of your property. The values of Vaadin multiselect fields are Sets, so using a matching type saves you the trouble of writing a custom Converter.
Second, the default FieldFactory doesn’t know to create a multiselect Field when given a property of a Collection/array type, so you’ll want to either write a custom FieldFactory or create the field manually:
OptionGroup og = new OptionGroup("MyEnums", EnumSet.allOf(MyEnum.class));
og.setMultiSelect(true);
binder.bind(og, "myEnums");
form.addComponent(og);
