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 * An extension of {@link VersionPathStrategy} that adds a method 023 * to determine the actual version of a {@link Resource}. 024 * 025 * @author Brian Clozel 026 * @author Rossen Stoyanchev 027 * @since 4.1 028 * @see VersionResourceResolver 029*/ 030public interface VersionStrategy extends VersionPathStrategy { 031 032 /** 033 * Determine the version for the given resource. 034 * @param resource the resource to check 035 * @return the version (never {@code null}) 036 */ 037 String getResourceVersion(Resource resource); 038 039}