package com.vaadin.tests.components.grid;
import java.util.stream.Stream;
import com.vaadin.data.provider.DataProvider;
import com.vaadin.data.provider.DataProviderListener;
import com.vaadin.data.provider.Query;
import com.vaadin.server.VaadinRequest;
import com.vaadin.shared.Registration;
import com.vaadin.tests.components.AbstractTestUI;
import com.vaadin.ui.Grid;
public class DataCommunicatorInfiniteLoop extends AbstractTestUI {
private static class CustomDataProvider
implements DataProvider<String, Void> {
private boolean sendRealCount = false;
@Override
public boolean isInMemory() {
return false;
}
@Override
public int size(Query<String, Void> query) {
if (sendRealCount) {
return 1;
} else {
sendRealCount = true;
return 2;
}
}
@Override
public Stream<String> fetch(Query<String, Void> query) {
return Stream.of("one item").skip(query.getOffset());
}
@Override
public void refreshItem(String item) {
}
@Override
public void refreshAll() {
}
@Override
public Registration addDataProviderListener(
DataProviderListener<String> listener) {
return () -> {
};
}
}
@Override
protected void setup(VaadinRequest request) {
Grid<String> grid = new Grid<>(new CustomDataProvider());
grid.addColumn(string -> string);
addComponent(grid);
}
}