001/* 002 * Copyright 2002-2018 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 org.apache.commons.logging.Log; 020import org.apache.commons.logging.LogFactory; 021 022import org.springframework.util.Assert; 023 024/** 025 * Abstract base class for {@link VersionStrategy} implementations that insert 026 * a prefix into the URL path, e.g. "version/static/myresource.js". 027 * 028 * @author Rossen Stoyanchev 029 * @author Brian Clozel 030 * @since 5.0 031 */ 032public abstract class AbstractPrefixVersionStrategy implements VersionStrategy { 033 034 protected final Log logger = LogFactory.getLog(getClass()); 035 036 037 private final String prefix; 038 039 040 protected AbstractPrefixVersionStrategy(String version) { 041 Assert.hasText(version, "Version must not be empty"); 042 this.prefix = version; 043 } 044 045 046 @Override 047 public String extractVersion(String requestPath) { 048 return (requestPath.startsWith(this.prefix) ? this.prefix : null); 049 } 050 051 @Override 052 public String removeVersion(String requestPath, String version) { 053 return requestPath.substring(this.prefix.length()); 054 } 055 056 @Override 057 public String addVersion(String path, String version) { 058 if (path.startsWith(".")) { 059 return path; 060 } 061 else if (this.prefix.endsWith("/") || path.startsWith("/")) { 062 return this.prefix + path; 063 } 064 else { 065 return this.prefix + '/' + path; 066 } 067 } 068 069}