/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.wicket.markup.repeater;
import java.util.Iterator;
import org.apache.wicket.model.IModel;
import org.apache.wicket.util.io.IClusterable;
/**
* Interface for item reuse strategies.
* <p>
* <u>Notice:</u> Child items will be rendered in the order they are provided by the returned
* iterator, so it is important that the strategy preserve this order
* </p>
*
* @author Igor Vaynberg (ivaynberg)
*
*/
public interface IItemReuseStrategy extends IClusterable
{
/**
* Returns an iterator over items that will be added to the view. The iterator needs to return
* all the items because the old ones are removed prior to the new ones added.
*
* @param <T>
* type of Item
*
* @param factory
* implementation of IItemFactory
* @param newModels
* iterator over models for items
* @param existingItems
* iterator over child items
* @return iterator over items that will be added after all the old items are moved.
*/
<T> Iterator<Item<T>> getItems(IItemFactory<T> factory, Iterator<IModel<T>> newModels,
Iterator<Item<T>> existingItems);
}