001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.eclipse.aether.internal.impl.transport.http;
020
021import javax.inject.Inject;
022import javax.inject.Named;
023import javax.inject.Singleton;
024
025import java.util.Map;
026import java.util.function.Function;
027
028import org.eclipse.aether.spi.connector.transport.http.ChecksumExtractor;
029import org.eclipse.aether.spi.connector.transport.http.ChecksumExtractorStrategy;
030
031import static java.util.Objects.requireNonNull;
032
033/**
034 * Checksum extractor.
035 */
036@Singleton
037@Named
038public final class DefaultChecksumExtractor implements ChecksumExtractor {
039    private final Map<String, ChecksumExtractorStrategy> strategies;
040
041    @Inject
042    public DefaultChecksumExtractor(Map<String, ChecksumExtractorStrategy> strategies) {
043        this.strategies = requireNonNull(strategies, "strategies");
044    }
045
046    @Override
047    public Map<String, String> extractChecksums(Function<String, String> headerGetter) {
048        for (ChecksumExtractorStrategy strategy : strategies.values()) {
049            Map<String, String> extracted = strategy.extractChecksums(headerGetter);
050            if (extracted != null && !extracted.isEmpty()) {
051                return extracted;
052            }
053        }
054        return null;
055    }
056}