001/* 002 * Copyright 2002-2015 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.servlet.resource; 018 019import org.springframework.core.io.Resource; 020 021/** 022 * A {@code VersionStrategy} that relies on a fixed version applied as a request 023 * path prefix, e.g. reduced SHA, version name, release date, etc. 024 * 025 * <p>This is useful for example when {@link ContentVersionStrategy} cannot be 026 * used such as when using JavaScript module loaders which are in charge of 027 * loading the JavaScript resources and need to know their relative paths. 028 * 029 * @author Brian Clozel 030 * @author Rossen Stoyanchev 031 * @since 4.1 032 * @see VersionResourceResolver 033 */ 034public class FixedVersionStrategy extends AbstractVersionStrategy { 035 036 private final String version; 037 038 039 /** 040 * Create a new FixedVersionStrategy with the given version string. 041 * @param version the fixed version string to use 042 */ 043 public FixedVersionStrategy(String version) { 044 super(new PrefixVersionPathStrategy(version)); 045 this.version = version; 046 } 047 048 049 @Override 050 public String getResourceVersion(Resource resource) { 051 return this.version; 052 } 053 054}