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; 018 019import org.apache.wicket.util.string.Strings; 020 021/** 022 * Various url utilities 023 * 024 * @author igor.vaynberg 025 */ 026public class UrlUtils 027{ 028 /** 029 * Constructor 030 */ 031 // TODO make it private in Wicket 7.0 032 protected UrlUtils() 033 { 034 035 } 036 037 /** 038 * Checks if the url is relative or absolute 039 * 040 * @param url 041 * @return <code>true</code> if url is relative, <code>false</code> otherwise 042 */ 043 public static boolean isRelative(final String url) 044 { 045 // the regex means "doesn't start with 'scheme://'" 046 if ((url != null) && (url.startsWith("/") == false) && (!url.matches("^\\w+\\:\\/\\/.*")) && 047 !(url.startsWith("#"))) 048 { 049 return true; 050 } 051 else 052 { 053 return false; 054 } 055 } 056 057 /** 058 * Rewrites a relative url to be context relative, leaves absolute urls same. 059 * 060 * @param url 061 * @param requestCycle 062 * @return rewritten url 063 */ 064 public static String rewriteToContextRelative(String url, IRequestCycle requestCycle) 065 { 066 if (isRelative(url)) 067 { 068 return requestCycle.getUrlRenderer().renderContextRelativeUrl(url); 069 } 070 else 071 { 072 return url; 073 } 074 } 075 076 /** 077 * Makes sure the path starts with a slash and does not end with a slash. Empty or null paths 078 * are normalized into an empty string. 079 * 080 * @param path 081 * path to normalize 082 * @return normalized path 083 */ 084 public static String normalizePath(String path) 085 { 086 if (Strings.isEmpty(path)) 087 { 088 return ""; 089 } 090 path = path.trim(); 091 if (!path.startsWith("/")) 092 { 093 path = "/" + path; 094 } 095 if (path.endsWith("/")) 096 { 097 path = path.substring(0, path.length() - 1); 098 } 099 return path; 100 } 101}