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package com.vaadin.tests.data;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.stream.Stream;
import com.vaadin.annotations.Widgetset;
import com.vaadin.data.HasDataProvider;
import com.vaadin.data.provider.DataProvider;
import com.vaadin.data.provider.ListDataProvider;
import com.vaadin.data.provider.Query;
import com.vaadin.server.VaadinRequest;
import com.vaadin.shared.data.DataCommunicatorConstants;
import com.vaadin.tests.components.AbstractTestUIWithLog;
import com.vaadin.tests.widgetset.TestingWidgetSet;
import com.vaadin.ui.AbstractSingleSelect;
import com.vaadin.ui.Button;
import com.vaadin.ui.HorizontalLayout;
@Widgetset(TestingWidgetSet.NAME)
public class DummyData extends AbstractTestUIWithLog {
/**
* DataProvider that keeps track on how often the data is requested.
*/
private class LoggingDataProvider extends ListDataProvider<String> {
private int count = 0;
private LoggingDataProvider(Collection<String> collection) {
super(collection);
}
@Override
public Stream<String> fetch(Query query) {
log("Backend request #" + count++);
return super.fetch(query);
}
}
/**
* Simplified server only selection model. Selection state passed in data,
* shown as bold text.
*/
public static class DummyComponent extends AbstractSingleSelect<String>
implements HasDataProvider<String> {
private DummyComponent() {
addDataGenerator((str, json) -> {
json.put(DataCommunicatorConstants.DATA, str);
if (isSelected(str)) {
json.put(DataCommunicatorConstants.SELECTED, true);
}
});
}
@Override
public DataProvider<String, ?> getDataProvider() {
return internalGetDataProvider();
}
@Override
public void setDataProvider(DataProvider<String, ?> dataProvider) {
internalSetDataProvider(dataProvider);
}
}
@Override
protected void setup(VaadinRequest request) {
DummyComponent dummy = new DummyComponent();
List<String> items = new ArrayList<>();
for (int i = 0; i < 300; ++i) {
items.add("Foo " + i);
}
dummy.setDataProvider(new LoggingDataProvider(items));
dummy.setValue("Foo 200");
HorizontalLayout controls = new HorizontalLayout();
addComponent(controls);
controls.addComponent(new Button("Select Foo 20",
event -> dummy.setValue("Foo " + 20)));
controls.addComponent(new Button("Reset data provider", event -> dummy
.setDataProvider(new LoggingDataProvider(items))));
controls.addComponent(
new Button("Remove all data", event -> dummy.setDataProvider(
new LoggingDataProvider(Collections.emptyList()))));
addComponent(dummy);
}
}
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