/*
* 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.WicketRuntimeException;
import org.apache.wicket.model.IModel;
/**
* Implementation of <code>IItemReuseStrategy</code> that returns new items
* every time.
*
* @see org.apache.wicket.extensions.markup.html.repeater.refreshing.IItemReuseStrategy
*
* @author Igor Vaynberg (ivaynberg)
*
*/
public class DefaultItemReuseStrategy implements IItemReuseStrategy
{
private static final long serialVersionUID = 1L;
private static final IItemReuseStrategy instance = new DefaultItemReuseStrategy();
/**
* @return static instance of this strategy
*/
public static IItemReuseStrategy getInstance()
{
return instance;
}
/**
* @see org.apache.wicket.extensions.markup.html.repeater.refreshing.IItemReuseStrategy#getItems(org.apache.wicket.extensions.markup.html.repeater.refreshing.IItemFactory,
* java.util.Iterator, java.util.Iterator)
*/
public Iterator getItems(final IItemFactory factory, final Iterator newModels,
final Iterator existingItems)
{
return new Iterator()
{
private int index = 0;
public void remove()
{
throw new UnsupportedOperationException();
}
public boolean hasNext()
{
return newModels.hasNext();
}
public Object next()
{
Object next = newModels.next();
if (next != null && ! (next instanceof IModel))
throw new WicketRuntimeException("Expecting an instance of " + IModel.class.getName() + ", got " + next.getClass().getName());
final IModel model = (IModel)next;
Item item = factory.newItem(index, model);
index++;
return item;
}
};
}
}