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}