sortabledataprovider.java

Wicket一个开发Java Web应用程序框架。它使得开发web应用程序变得容易而轻松。 Wicket利用一个POJO data beans组件使得它可以与任何持久层技术相结合。

/*
 * 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.extensions.markup.html.repeater.util;

import org.apache.wicket.extensions.markup.html.repeater.data.sort.ISortState;
import org.apache.wicket.extensions.markup.html.repeater.data.table.ISortableDataProvider;


/**
 * Convenience implementation of a data provider that can also act as a locator for a
 * {@link SingleSortState} object.
 * 
 * Most times it is convenient to keep sort and filtering information inside the data provider
 * implementation because it makes that information easy to access within the data provider.
 * 
 * @author Igor Vaynberg (ivaynberg at apache dot org)
 */
public abstract class SortableDataProvider implements ISortableDataProvider
{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private SingleSortState state = new SingleSortState();

	/**
	 * @see ISortableDataProvider#getSortState()
	 */
	public final ISortState getSortState()
	{
		return state;
	}

	/**
	 * @see ISortableDataProvider#setSortState(org.apache.wicket.extensions.markup.html.repeater.data.sort.ISortState)
	 */
	public final void setSortState(ISortState state)
	{
		if (!(state instanceof SingleSortState))
		{
			throw new IllegalArgumentException(
					"argument [state] must be an instance of SingleSortState, but it is [" +
							state.getClass().getName() + "]:[" + state.toString() + "]");
		}
		this.state = (SingleSortState)state;
	}

	/**
	 * Returns current sort state
	 * 
	 * @return current sort state
	 */
	public SortParam getSort()
	{
		return state.getSort();
	}

	/**
	 * Sets the current sort state
	 * 
	 * @param param
	 *            parameter containing new sorting information
	 */
	public void setSort(SortParam param)
	{
		state.setSort(param);
	}

	/**
	 * Sets the current sort state
	 * 
	 * @param property
	 *            sort property
	 * @param ascending
	 *            sort direction
	 */
	public void setSort(String property, boolean ascending)
	{
		setSort(new SortParam(property, ascending));
	}

	/**
	 * @see ISortableDataProvider#detach()
	 */
	public void detach()
	{
	}


}