001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.request.mapper.info;
018
019import org.apache.wicket.util.string.Strings;
020
021/**
022 * Possible string representation of PageInfo:
023 * <ul>
024 * <li>pageId
025 * </ul>
026 * 
027 * @author Matej Knopp
028 */
029public class PageInfo
030{
031        private final Integer pageId;
032
033        /**
034         * Construct.
035         * 
036         * @param pageId
037         */
038        public PageInfo(final Integer pageId)
039        {
040                this.pageId = pageId;
041        }
042
043        /**
044         * Construct.
045         */
046        public PageInfo()
047        {
048                this(null);
049        }
050
051        /**
052         * @return page id
053         */
054        public Integer getPageId()
055        {
056                return pageId;
057        }
058
059        /**
060         * The {@link #pageId} as string
061         */
062        @Override
063        public String toString()
064        {
065                if (getPageId() == null)
066                {
067                        return "";
068                }
069                else
070                {
071                        return getPageId().toString();
072                }
073        }
074
075
076        /**
077         * @param src
078         * @return page info instance or <code>null</code> if the string couldn't have been parsed
079         */
080        public static PageInfo parse(final String src)
081        {
082                if (Strings.isEmpty(src))
083                {
084                        return new PageInfo();
085                }
086                else
087                {
088                        try
089                        {
090                                return new PageInfo(Integer.valueOf(src));
091                        }
092                        catch (NumberFormatException e)
093                        {
094                                return null;
095                        }
096                }
097        }
098}