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 reactor.core.publisher.Mono; 020 021import org.springframework.core.io.Resource; 022 023/** 024 * A {@code VersionStrategy} that relies on a fixed version applied as a request 025 * path prefix, e.g. reduced SHA, version name, release date, etc. 026 * 027 * <p>This is useful for example when {@link ContentVersionStrategy} cannot be 028 * used such as when using JavaScript module loaders which are in charge of 029 * loading the JavaScript resources and need to know their relative paths. 030 * 031 * @author Rossen Stoyanchev 032 * @author Brian Clozel 033 * @since 5.0 034 * @see VersionResourceResolver 035 */ 036public class FixedVersionStrategy extends AbstractPrefixVersionStrategy { 037 038 private final Mono<String> versionMono; 039 040 041 /** 042 * Create a new FixedVersionStrategy with the given version string. 043 * @param version the fixed version string to use 044 */ 045 public FixedVersionStrategy(String version) { 046 super(version); 047 this.versionMono = Mono.just(version); 048 } 049 050 051 @Override 052 public Mono<String> getResourceVersion(Resource resource) { 053 return this.versionMono; 054 } 055 056}