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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;
import com.vaadin.ui.Label;
import com.vaadin.ui.VerticalLayout;
/**
* CallbackDataProvider that logs info in UI on Queries it receives.
*/
public class LoggingItemDataProvider
extends CallbackDataProvider<String, String> {
private int counter;
public LoggingItemDataProvider(int size, VerticalLayout logContainer) {
super(q -> fetch(logContainer, q, size),
q -> size(logContainer, q, size));
}
private static Stream<String> fetch(VerticalLayout logContainer,
Query<String, String> query, int size) {
log("FETCH", query, logContainer);
return itemStream(query, size).skip(query.getOffset())
.limit(query.getLimit());
}
private static int size(VerticalLayout logContainer,
Query<String, String> query, int size) {
log("SIZE", query, logContainer);
return size(query, 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;
}
private static Label log(String queryType, Query<String, String> query,
VerticalLayout logContainer) {
int componentCount = logContainer.getComponentCount();
Label label = new Label(componentCount + ": " + queryType + " "
+ query.getOffset() + " " + query.getLimit() + " "
+ query.getFilter().orElse(""));
logContainer.addComponentAsFirst(label);
label.setId(queryType + "-" + componentCount);
label.setStyleName("log");
return label;
}
}
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