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 strategy, that aims for given type of included checksum.
26 *
27 * @since 2.0.0
28 */
29 public abstract class ChecksumExtractorStrategy {
30 /**
31 * Extract checksums using given getter, if possible, or {@code null}.
32 * <p>
33 * The supplied {@code headerGetter} function should provide access to given transport response HTTP Headers in
34 * some common way, like for example returning first header value, or {@code null} if header not present.
35 *
36 * @param headerGetter A function that provides access to response HTTP Headers, never {@code null}.
37 * @return Map of extracted checksums, or {@code null} if none extracted.
38 */
39 public Map<String, String> extractChecksums(Function<String, String> headerGetter) {
40 return null;
41 }
42 }