/*
 * 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.request.mapper.info;

import org.apache.wicket.util.string.Strings;

/**
 * Possible string representation of PageInfo:
 * <ul>
 * <li>pageId
 * </ul>
 * 
 * @author Matej Knopp
 */
public class PageInfo
{
	private final Integer pageId;
	private final String stringId;

	/**
	 * Construct.
	 *
	 * @param pageId
	 */
	public PageInfo(final Integer pageId)
	{
		this.pageId = pageId;
		stringId = (pageId == null) ? "" : pageId.toString();
	}

	/**
	 * Construct.
	 */
	public PageInfo()
	{
		this(null);
	}

	/**
	 * @return page id
	 */
	public Integer getPageId()
	{
		return pageId;
	}

	/**
	 * The {@link #pageId} as string
	 */
	@Override
	public String toString()
	{
		return stringId;
	}


	/**
	 * @param src
	 * @return page info instance or <code>null</code> if the string couldn't have been parsed
	 */
	public static PageInfo parse(final String src)
	{
		if (Strings.isEmpty(src))
		{
			return new PageInfo();
		}
		else
		{
			try
			{
				return new PageInfo(Integer.valueOf(src));
			}
			catch (NumberFormatException e)
			{
				return null;
			}
		}
	}
}
