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An implementation of the repository system.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.eclipse.aether.internal.impl;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.repository.Authentication;
import org.eclipse.aether.repository.Proxy;
import org.eclipse.aether.repository.RemoteRepository;
import org.eclipse.aether.spi.connector.transport.Transporter;
import org.eclipse.aether.spi.connector.transport.TransporterFactory;
import org.eclipse.aether.spi.connector.transport.TransporterProvider;
import org.eclipse.aether.transfer.NoTransporterException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static java.util.Objects.requireNonNull;

/**
 */
@Singleton
@Named
public final class DefaultTransporterProvider implements TransporterProvider {

    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultTransporterProvider.class);

    private final Map transporterFactories;

    @Inject
    public DefaultTransporterProvider(Map transporterFactories) {
        this.transporterFactories = Collections.unmodifiableMap(transporterFactories);
    }

    @Override
    public Transporter newTransporter(RepositorySystemSession session, RemoteRepository repository)
            throws NoTransporterException {
        requireNonNull(session, "session cannot be null");
        requireNonNull(repository, "repository cannot be null");

        PrioritizedComponents factories = PrioritizedComponents.reuseOrCreate(
                session, TransporterFactory.class, transporterFactories, TransporterFactory::getPriority);

        List errors = new ArrayList<>();
        for (PrioritizedComponent factory : factories.getEnabled()) {
            try {
                Transporter transporter = factory.getComponent().newInstance(session, repository);

                if (LOGGER.isDebugEnabled()) {
                    StringBuilder buffer = new StringBuilder(256);
                    buffer.append("Using transporter ")
                            .append(transporter.getClass().getSimpleName());
                    Utils.appendClassLoader(buffer, transporter);
                    buffer.append(" with priority ").append(factory.getPriority());
                    buffer.append(" for ").append(repository.getUrl());

                    Authentication auth = repository.getAuthentication();
                    if (auth != null) {
                        buffer.append(" with ").append(auth);
                    }

                    Proxy proxy = repository.getProxy();
                    if (proxy != null) {
                        buffer.append(" via ")
                                .append(proxy.getHost())
                                .append(':')
                                .append(proxy.getPort());

                        auth = proxy.getAuthentication();
                        if (auth != null) {
                            buffer.append(" with ").append(auth);
                        }
                    }

                    LOGGER.debug(buffer.toString());
                }

                return transporter;
            } catch (NoTransporterException e) {
                // continue and try next factory
                LOGGER.debug("Could not obtain transporter factory for {}", repository, e);
                errors.add(e);
            }
        }

        StringBuilder buffer = new StringBuilder(256);
        if (factories.isEmpty()) {
            buffer.append("No transporter factories registered");
        } else {
            buffer.append("Cannot access ").append(repository.getUrl());
            buffer.append(" using the registered transporter factories: ");
            factories.list(buffer);
        }

        // create exception: if one error, make it cause
        NoTransporterException ex =
                new NoTransporterException(repository, buffer.toString(), errors.size() == 1 ? errors.get(0) : null);
        // if more errors, make them all suppressed
        if (errors.size() > 1) {
            errors.forEach(ex::addSuppressed);
        }
        throw ex;
    }
}