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/*
* Copyright 2000-2016 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.data.provider;
import java.util.Collections;
import java.util.List;
/**
* A data provider that lazy loads items from a back end.
*
* @param <T>
* data provider data type
* @param <F>
* data provider filter type
*/
public interface BackEndDataProvider<T, F> extends DataProvider<T, F> {
/**
* Sets a list of sort orders to use as the default sorting for this data
* provider. This overrides the sorting set by any other method that
* manipulates the default sorting of this data provider.
* <p>
* The default sorting is used if the query defines no sorting. The default
* sorting is also used to determine the ordering of items that are
* considered equal by the sorting defined in the query.
*
* @see #setSortOrder(QuerySortOrder)
*
* @param sortOrders
* a list of sort orders to set, not <code>null</code>
*/
void setSortOrders(List<QuerySortOrder> sortOrders);
/**
* Sets a single sort order to use as the default sorting for this data
* provider. This overrides the sorting set by any other method that
* manipulates the default sorting of this data provider.
* <p>
* The default sorting is used if the query defines no sorting. The default
* sorting is also used to determine the ordering of items that are
* considered equal by the sorting defined in the query.
*
* @see #setSortOrders(List)
*
* @param sortOrder
* a sort order to set, or <code>null</code> to clear any
* previously set sort orders
*/
default void setSortOrder(QuerySortOrder sortOrder) {
if (sortOrder == null) {
setSortOrders(Collections.emptyList());
} else {
setSortOrders(Collections.singletonList(sortOrder));
}
}
@Override
default boolean isInMemory() {
return false;
}
}
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