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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;
20  
21  import javax.inject.Inject;
22  import javax.inject.Named;
23  import javax.inject.Singleton;
24  
25  import java.util.ArrayList;
26  import java.util.Collections;
27  import java.util.List;
28  import java.util.Map;
29  
30  import org.eclipse.aether.RepositorySystemSession;
31  import org.eclipse.aether.repository.RemoteRepository;
32  import org.eclipse.aether.spi.connector.layout.RepositoryLayout;
33  import org.eclipse.aether.spi.connector.layout.RepositoryLayoutFactory;
34  import org.eclipse.aether.spi.connector.layout.RepositoryLayoutProvider;
35  import org.eclipse.aether.transfer.NoRepositoryLayoutException;
36  import org.slf4j.Logger;
37  import org.slf4j.LoggerFactory;
38  
39  import static java.util.Objects.requireNonNull;
40  
41  /**
42   */
43  @Singleton
44  @Named
45  public final class DefaultRepositoryLayoutProvider implements RepositoryLayoutProvider {
46  
47      private static final Logger LOGGER = LoggerFactory.getLogger(DefaultRepositoryLayoutProvider.class);
48  
49      private final Map<String, RepositoryLayoutFactory> layoutFactories;
50  
51      @Inject
52      public DefaultRepositoryLayoutProvider(Map<String, RepositoryLayoutFactory> layoutFactories) {
53          this.layoutFactories = Collections.unmodifiableMap(layoutFactories);
54      }
55  
56      @Override
57      public RepositoryLayout newRepositoryLayout(RepositorySystemSession session, RemoteRepository repository)
58              throws NoRepositoryLayoutException {
59          requireNonNull(session, "session cannot be null");
60          requireNonNull(repository, "remote repository cannot be null");
61  
62          PrioritizedComponents<RepositoryLayoutFactory> factories =
63                  PrioritizedComponents.reuseOrCreate(session, layoutFactories, RepositoryLayoutFactory::getPriority);
64  
65          List<NoRepositoryLayoutException> errors = new ArrayList<>();
66          for (PrioritizedComponent<RepositoryLayoutFactory> factory : factories.getEnabled()) {
67              try {
68                  return factory.getComponent().newInstance(session, repository);
69              } catch (NoRepositoryLayoutException e) {
70                  // continue and try next factory
71                  errors.add(e);
72              }
73          }
74          if (LOGGER.isDebugEnabled() && errors.size() > 1) {
75              for (Exception e : errors) {
76                  LOGGER.debug("Could not obtain layout factory for {}", repository, e);
77              }
78          }
79  
80          StringBuilder buffer = new StringBuilder(256);
81          if (factories.isEmpty()) {
82              buffer.append("No layout factories registered");
83          } else {
84              buffer.append("Cannot access ").append(repository.getUrl());
85              buffer.append(" with type ").append(repository.getContentType());
86              buffer.append(" using the available layout factories: ");
87              factories.list(buffer);
88          }
89  
90          throw new NoRepositoryLayoutException(repository, buffer.toString(), errors.size() == 1 ? errors.get(0) : null);
91      }
92  }