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;
020
021import javax.inject.Inject;
022import javax.inject.Named;
023import javax.inject.Singleton;
024
025import java.util.ArrayList;
026import java.util.Collections;
027import java.util.List;
028import java.util.Map;
029
030import org.eclipse.aether.RepositorySystemSession;
031import org.eclipse.aether.repository.RemoteRepository;
032import org.eclipse.aether.spi.connector.layout.RepositoryLayout;
033import org.eclipse.aether.spi.connector.layout.RepositoryLayoutFactory;
034import org.eclipse.aether.spi.connector.layout.RepositoryLayoutProvider;
035import org.eclipse.aether.transfer.NoRepositoryLayoutException;
036import org.slf4j.Logger;
037import org.slf4j.LoggerFactory;
038
039import static java.util.Objects.requireNonNull;
040
041/**
042 */
043@Singleton
044@Named
045public final class DefaultRepositoryLayoutProvider implements RepositoryLayoutProvider {
046
047    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultRepositoryLayoutProvider.class);
048
049    private final Map<String, RepositoryLayoutFactory> layoutFactories;
050
051    @Inject
052    public DefaultRepositoryLayoutProvider(Map<String, RepositoryLayoutFactory> layoutFactories) {
053        this.layoutFactories = Collections.unmodifiableMap(layoutFactories);
054    }
055
056    @Override
057    public RepositoryLayout newRepositoryLayout(RepositorySystemSession session, RemoteRepository repository)
058            throws NoRepositoryLayoutException {
059        requireNonNull(session, "session cannot be null");
060        requireNonNull(repository, "remote repository cannot be null");
061
062        PrioritizedComponents<RepositoryLayoutFactory> factories =
063                PrioritizedComponents.reuseOrCreate(session, layoutFactories, RepositoryLayoutFactory::getPriority);
064
065        List<NoRepositoryLayoutException> errors = new ArrayList<>();
066        for (PrioritizedComponent<RepositoryLayoutFactory> factory : factories.getEnabled()) {
067            try {
068                return factory.getComponent().newInstance(session, repository);
069            } catch (NoRepositoryLayoutException e) {
070                // continue and try next factory
071                errors.add(e);
072            }
073        }
074        if (LOGGER.isDebugEnabled() && errors.size() > 1) {
075            for (Exception e : errors) {
076                LOGGER.debug("Could not obtain layout factory for {}", repository, e);
077            }
078        }
079
080        StringBuilder buffer = new StringBuilder(256);
081        if (factories.isEmpty()) {
082            buffer.append("No layout factories registered");
083        } else {
084            buffer.append("Cannot access ").append(repository.getUrl());
085            buffer.append(" with type ").append(repository.getContentType());
086            buffer.append(" using the available layout factories: ");
087            factories.list(buffer);
088        }
089
090        throw new NoRepositoryLayoutException(repository, buffer.toString(), errors.size() == 1 ? errors.get(0) : null);
091    }
092}