001/* 002 * Copyright 2002-2016 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.web.reactive.resource; 018 019import java.util.regex.Matcher; 020import java.util.regex.Pattern; 021 022import org.apache.commons.logging.Log; 023import org.apache.commons.logging.LogFactory; 024 025import org.springframework.util.StringUtils; 026 027/** 028 * Abstract base class for filename suffix based {@link VersionStrategy} 029 * implementations, e.g. "static/myresource-version.js" 030 * 031 * @author Rossen Stoyanchev 032 * @author Brian Clozel 033 * @since 5.0 034 */ 035public abstract class AbstractFileNameVersionStrategy implements VersionStrategy { 036 037 protected final Log logger = LogFactory.getLog(getClass()); 038 039 private static final Pattern pattern = Pattern.compile("-(\\S*)\\."); 040 041 042 @Override 043 public String extractVersion(String requestPath) { 044 Matcher matcher = pattern.matcher(requestPath); 045 if (matcher.find()) { 046 String match = matcher.group(1); 047 return (match.contains("-") ? match.substring(match.lastIndexOf('-') + 1) : match); 048 } 049 else { 050 return null; 051 } 052 } 053 054 @Override 055 public String removeVersion(String requestPath, String version) { 056 return StringUtils.delete(requestPath, "-" + version); 057 } 058 059 @Override 060 public String addVersion(String requestPath, String version) { 061 String baseFilename = StringUtils.stripFilenameExtension(requestPath); 062 String extension = StringUtils.getFilenameExtension(requestPath); 063 return (baseFilename + '-' + version + '.' + extension); 064 } 065 066}