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package com.vaadin.tests.util;
import java.util.Locale;
import java.util.stream.IntStream;
import java.util.stream.Stream;
import com.vaadin.data.provider.CallbackDataProvider;
import com.vaadin.data.provider.Query;
/**
* A data provider for tests that creates "Item n" strings on the fly.
*
* @author Vaadin Ltd
*/
public class ItemDataProvider extends CallbackDataProvider<String, String> {
public ItemDataProvider(int size) {
super(q -> itemStream(q, size).skip(q.getOffset()).limit(q.getLimit()),
q -> size(q, size));
}
private static Stream<String> itemStream(Query<String, String> q,
int size) {
Stream<String> stream = IntStream.range(0, size)
.mapToObj(i -> "Item " + i);
String filterText = q.getFilter().orElse("").toLowerCase(Locale.US);
if (filterText.isEmpty()) {
return stream;
}
return stream.filter(
text -> text.toLowerCase(Locale.US).contains(filterText));
}
private static int size(Query<String, String> q, int size) {
if (!q.getFilter().orElse("").isEmpty()) {
return (int) itemStream(q, size).count();
}
return size;
}
}
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