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.collect;
020
021import javax.inject.Inject;
022import javax.inject.Named;
023import javax.inject.Singleton;
024
025import java.util.Map;
026
027import org.eclipse.aether.RepositorySystemSession;
028import org.eclipse.aether.collection.CollectRequest;
029import org.eclipse.aether.collection.CollectResult;
030import org.eclipse.aether.collection.DependencyCollectionException;
031import org.eclipse.aether.impl.DependencyCollector;
032import org.eclipse.aether.util.ConfigUtils;
033
034import static java.util.Objects.requireNonNull;
035
036/**
037 * Default implementation of {@link DependencyCollector} that merely indirect to selected delegate.
038 */
039@Singleton
040@Named
041public class DefaultDependencyCollector implements DependencyCollector {
042    private static final String CONFIG_PROP_COLLECTOR_IMPL = "aether.dependencyCollector.impl";
043
044    private static final String DEFAULT_COLLECTOR_IMPL =
045            org.eclipse.aether.internal.impl.collect.bf.BfDependencyCollector.NAME;
046
047    private final Map<String, DependencyCollectorDelegate> delegates;
048
049    @Inject
050    public DefaultDependencyCollector(Map<String, DependencyCollectorDelegate> delegates) {
051        this.delegates = requireNonNull(delegates);
052    }
053
054    @Override
055    public CollectResult collectDependencies(RepositorySystemSession session, CollectRequest request)
056            throws DependencyCollectionException {
057        String delegateName = ConfigUtils.getString(session, DEFAULT_COLLECTOR_IMPL, CONFIG_PROP_COLLECTOR_IMPL);
058        DependencyCollectorDelegate delegate = delegates.get(delegateName);
059        if (delegate == null) {
060            throw new IllegalArgumentException(
061                    "Unknown collector impl: '" + delegateName + "', known implementations are " + delegates.keySet());
062        }
063        return delegate.collectDependencies(session, request);
064    }
065}