1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 */ 19 package org.eclipse.aether.spi.connector.transport.http; 20 21 import java.util.Map; 22 import java.util.function.Function; 23 24 /** 25 * Checksum extractor. Uses all known {@link ChecksumExtractorStrategy} components to extract included checksums, 26 * first extractor returning non-empty value wins. 27 * 28 * @since 2.0.0 29 */ 30 public interface ChecksumExtractor { 31 /** 32 * Extract checksums using given getter, if possible, or {@code null}. 33 * <p> 34 * The supplied {@code headerGetter} function should provide access to given transport response HTTP Headers in 35 * some common way, like for example returning first header value, or {@code null} if header not present. 36 * 37 * @param headerGetter A function that provides access to response HTTP Headers, never {@code null}. 38 * @return Map of extracted checksums, or {@code null} if none extracted. 39 */ 40 Map<String, String> extractChecksums(Function<String, String> headerGetter); 41 }