org.apache.wicket.markup.repeater.data.EmptyDataProvider Maven / Gradle / Ivy

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Wicket is a Java web application framework that takes simplicity, separation of concerns and ease of development to a whole new level. Wicket pages can be mocked up, previewed and later revised using standard WYSIWYG HTML design tools. Dynamic content processing and form handling is all handled in Java code using a first-class component model backed by POJO data beans that can easily be persisted using your favorite technology.

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/*
 * 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.data;

import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.apache.wicket.model.IModel;


/**
 * A convenience class to represent an empty data provider.
 * 
 * @author Phil Kulak
 * @param 
 */
public class EmptyDataProvider implements IDataProvider
{
	private static final long serialVersionUID = 1L;

	private static EmptyDataProvider INSTANCE = new EmptyDataProvider();

	/**
	 * @param 
	 * @return the singleton instance of this class
	 */
	@SuppressWarnings("unchecked")
	public static  EmptyDataProvider getInstance()
	{
		return (EmptyDataProvider)INSTANCE;
	}

	/**
	 * @see IDataProvider#iterator(long, long)
	 */
	@Override
	public Iterator iterator(long first, long count)
	{
		List list = Collections.emptyList();
		return list.iterator();
	}

	/**
	 * @see IDataProvider#size()
	 */
	@Override
	public long size()
	{
		return 0;
	}

	/**
	 * @see IDataProvider#model(Object)
	 */
	@Override
	public IModel model(Object object)
	{
		return null;
	}

	/**
	 * @see org.apache.wicket.model.IDetachable#detach()
	 */
	@Override
	public void detach()
	{
	}
}