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/* * Copyright 2002-2016 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.springframework.web.reactive.resource; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.util.Assert; /** * Abstract base class for {@link VersionStrategy} implementations that insert * a prefix into the URL path, e.g. "version/static/myresource.js". * * @author Rossen Stoyanchev * @author Brian Clozel * @since 5.0 */ public abstract class AbstractPrefixVersionStrategy implements VersionStrategy { protected final Log logger = LogFactory.getLog(getClass()); private final String prefix; protected AbstractPrefixVersionStrategy(String version) { Assert.hasText(version, "'version' must not be empty"); this.prefix = version; } @Override public String extractVersion(String requestPath) { return requestPath.startsWith(this.prefix) ? this.prefix : null; } @Override public String removeVersion(String requestPath, String version) { return requestPath.substring(this.prefix.length()); } @Override public String addVersion(String path, String version) { if (path.startsWith(".")) { return path; } else if (this.prefix.endsWith("/") || path.startsWith("/")) { return this.prefix + path; } else { return this.prefix + '/' + path; } } }