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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.impl;

import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.repository.RemoteRepository;
import org.eclipse.aether.transfer.RepositoryOfflineException;

/**
 * Determines whether a remote repository is accessible in offline mode.
 *
 * @noimplement This interface is not intended to be implemented by clients.
 * @noextend This interface is not intended to be extended by clients.
 * @provisional This type is provisional and can be changed, moved or removed without prior notice.
 */
public interface OfflineController {

    /**
     * Determines whether the specified repository is accessible if the system was in offline mode. A simple
     * implementation might unconditionally throw {@link RepositoryOfflineException} to block all remote repository
     * access when in offline mode. More sophisticated implementations might inspect
     * {@link RepositorySystemSession#getConfigProperties() configuration properties} of the session to check for some
     * kind of whitelist that allows certain remote repositories even when offline. At any rate, the session's current
     * {@link RepositorySystemSession#isOffline() offline state} is irrelevant to the outcome of the check.
     *
     * @param session The repository session during which the check is made, must not be {@code null}.
     * @param repository The remote repository to check for offline access, must not be {@code null}.
     * @throws RepositoryOfflineException If the repository is not accessible in offline mode. If the method returns
     *             normally, the repository is considered accessible even in offline mode.
     * @see RepositorySystemSession#isOffline()
     */
    void checkOffline(RepositorySystemSession session, RemoteRepository repository) throws RepositoryOfflineException;
}