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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.internal.impl.transport.http;
20  
21  import javax.inject.Inject;
22  import javax.inject.Named;
23  import javax.inject.Singleton;
24  
25  import java.util.Map;
26  import java.util.function.Function;
27  
28  import org.eclipse.aether.spi.connector.transport.http.ChecksumExtractor;
29  import org.eclipse.aether.spi.connector.transport.http.ChecksumExtractorStrategy;
30  
31  import static java.util.Objects.requireNonNull;
32  
33  /**
34   * Checksum extractor.
35   */
36  @Singleton
37  @Named
38  public final class DefaultChecksumExtractor implements ChecksumExtractor {
39      private final Map<String, ChecksumExtractorStrategy> strategies;
40  
41      @Inject
42      public DefaultChecksumExtractor(Map<String, ChecksumExtractorStrategy> strategies) {
43          this.strategies = requireNonNull(strategies, "strategies");
44      }
45  
46      @Override
47      public Map<String, String> extractChecksums(Function<String, String> headerGetter) {
48          for (ChecksumExtractorStrategy strategy : strategies.values()) {
49              Map<String, String> extracted = strategy.extractChecksums(headerGetter);
50              if (extracted != null && !extracted.isEmpty()) {
51                  return extracted;
52              }
53          }
54          return null;
55      }
56  }