package org.eclipse.aether.transport.wagon;

/*
 * 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.
 */

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

import java.util.Objects;

import org.eclipse.aether.RepositorySystemSession;
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.locator.Service;
import org.eclipse.aether.spi.locator.ServiceLocator;
import org.eclipse.aether.transfer.NoTransporterException;

/**
 * A transporter factory using <a href="http://maven.apache.org/wagon/" target="_blank">Apache Maven Wagon</a>. Note
 * that this factory merely serves as an adapter to the Wagon API and by itself does not provide any transport services
 * unless one or more wagon implementations are registered with the {@link WagonProvider}.
 */
@Named( "wagon" )
public final class WagonTransporterFactory
    implements TransporterFactory, Service
{

    private WagonProvider wagonProvider;

    private WagonConfigurator wagonConfigurator;

    private float priority = -1.0f;

    /**
     * Creates an (uninitialized) instance of this transporter factory. <em>Note:</em> In case of manual instantiation
     * by clients, the new factory needs to be configured via its various mutators before first use or runtime errors
     * will occur.
     */
    public WagonTransporterFactory()
    {
        // enables default constructor
    }

    @Inject
    WagonTransporterFactory( WagonProvider wagonProvider, WagonConfigurator wagonConfigurator )
    {
        setWagonProvider( wagonProvider );
        setWagonConfigurator( wagonConfigurator );
    }

    @Override
    public void initService( ServiceLocator locator )
    {
        setWagonProvider( locator.getService( WagonProvider.class ) );
        setWagonConfigurator( locator.getService( WagonConfigurator.class ) );
    }

    /**
     * Sets the wagon provider to use to acquire and release wagon instances.
     *
     * @param wagonProvider The wagon provider to use, may be {@code null}.
     * @return This factory for chaining, never {@code null}.
     */
    public WagonTransporterFactory setWagonProvider( WagonProvider wagonProvider )
    {
        this.wagonProvider = wagonProvider;
        return this;
    }

    /**
     * Sets the wagon configurator to use to apply provider-specific configuration to wagon instances.
     *
     * @param wagonConfigurator The wagon configurator to use, may be {@code null}.
     * @return This factory for chaining, never {@code null}.
     */
    public WagonTransporterFactory setWagonConfigurator( WagonConfigurator wagonConfigurator )
    {
        this.wagonConfigurator = wagonConfigurator;
        return this;
    }

    @Override
    public float getPriority()
    {
        return priority;
    }

    /**
     * Sets the priority of this component.
     *
     * @param priority The priority.
     * @return This component for chaining, never {@code null}.
     */
    public WagonTransporterFactory setPriority( float priority )
    {
        this.priority = priority;
        return this;
    }

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

        return new WagonTransporter( wagonProvider, wagonConfigurator, repository, session );
    }

}
