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package com.vaadin.data.provider.bov;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.junit.Before;
import org.junit.Test;
import com.vaadin.data.provider.DataProvider;
import com.vaadin.data.provider.QuerySortOrder;
import com.vaadin.shared.data.sort.SortDirection;
/**
* Vaadin 8 Example from Book of Vaadin
*
* @author Vaadin Ltd
*/
public class DataProviderBoVTest {
private PersonServiceImpl personService;
public static class PersonServiceImpl implements PersonService {
final Person[] persons;
public PersonServiceImpl(Person... persons) {
this.persons = persons;
}
@Override
public List<Person> fetchPersons(int offset, int limit) {
return Arrays.stream(persons).skip(offset).limit(limit)
.collect(Collectors.toList());
}
@Override
public List<Person> fetchPersons(int offset, int limit,
Collection<PersonSort> personSorts) {
Stream<Person> personStream = Arrays.stream(persons).skip(offset)
.limit(limit);
if (personSorts != null) {
for (PersonSort personSort : personSorts) {
personStream = personStream.sorted(personSort);
}
}
return personStream.collect(Collectors.toList());
}
@Override
public int getPersonCount() {
return persons.length;
}
@Override
public PersonSort createSort(String propertyName, boolean descending) {
PersonSort result;
switch (propertyName) {
case "name":
result = (person1, person2) -> String.CASE_INSENSITIVE_ORDER
.compare(person1.getName(), person2.getName());
break;
case "born":
result = (person1, person2) -> person2.getBorn()
- person1.getBorn();
break;
default:
throw new IllegalArgumentException(
"wrong field name " + propertyName);
}
if (descending) {
return (person1, person2) -> result.compare(person2, person1);
} else {
return result;
}
}
}
@Test
public void testPersons() {
DataProvider<Person, ?> dataProvider = createUnsortedDataProvider();
// TODO test if the provider contains all defined Persons in
// correct(unchanged) order
}
private DataProvider<Person, ?> createUnsortedDataProvider() {
DataProvider<Person, ?> dataProvider = DataProvider.fromCallbacks(
// First callback fetches items based on a query
query -> {
// The index of the first item to load
int offset = query.getOffset();
// The number of items to load
int limit = query.getLimit();
List<Person> persons = getPersonService()
.fetchPersons(offset, limit);
return persons.stream();
},
// Second callback fetches the number of items for a query
query -> getPersonService().getPersonCount());
return dataProvider;
}
@Test
public void testSortedPersons() {
DataProvider<Person, ?> dataProvider = createSortedDataProvider();
// TODO test if provider contains all defined Persons in correct order
// TODO test Query.sortOrders correctness
}
private DataProvider<Person, ?> createSortedDataProvider() {
DataProvider<Person, ?> dataProvider = DataProvider.fromCallbacks(
// First callback fetches items based on a query
query -> {
List<PersonService.PersonSort> sortOrders = new ArrayList<>();
for (QuerySortOrder queryOrder : query.getSortOrders()) {
PersonService.PersonSort sort = personService
.createSort(
// The name of the sorted property
queryOrder.getSorted(),
// The sort direction for this property
queryOrder
.getDirection() == SortDirection.DESCENDING);
sortOrders.add(sort);
}
return getPersonService().fetchPersons(query.getOffset(),
query.getLimit(), sortOrders).stream();
},
// Second callback fetches the number of items for a query
query -> getPersonService().getPersonCount());
return dataProvider;
}
public PersonServiceImpl getPersonService() {
return personService;
}
@Before
public void buildService() {
personService = new PersonServiceImpl(
new Person("George Washington", 1732),
new Person("John Adams", 1735),
new Person("Thomas Jefferson", 1743),
new Person("James Madison", 1751));
}
}
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