com.vaadin.flow.component.listbox.dataview.ListBoxDataView Maven / Gradle / Ivy
/*
* Copyright 2000-2024 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.flow.component.listbox.dataview;
import com.vaadin.flow.component.listbox.ListBoxBase;
import com.vaadin.flow.data.provider.AbstractDataView;
import com.vaadin.flow.data.provider.DataProvider;
import com.vaadin.flow.data.provider.Query;
import com.vaadin.flow.function.SerializableSupplier;
/**
* Implementation of generic data view for ListBox.
*
* @param
* the item type
* @since
*/
public class ListBoxDataView extends AbstractDataView {
/**
* Constructs a new generic data view for ListBox and verifies the passed
* data provider is compatible with this data view implementation.
*
* @param dataProviderSupplier
* data provider supplier
* @param listBox
* list box instance for this DataView
*/
public ListBoxDataView(
SerializableSupplier> dataProviderSupplier,
ListBoxBase listBox) {
super(dataProviderSupplier, listBox);
}
@Override
protected Class getSupportedDataProviderType() {
return DataProvider.class;
}
@Override
public T getItem(int index) {
final int dataSize = dataProviderSupplier.get().size(new Query<>());
if (dataSize == 0) {
throw new IndexOutOfBoundsException(
String.format("Requested index %d on empty data.", index));
}
if (index < 0 || index >= dataSize) {
throw new IndexOutOfBoundsException(String.format(
"Given index %d is outside of the accepted range '0 - %d'",
index, dataSize - 1));
}
return getItems().skip(index).findFirst().orElse(null);
}
}