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Apache Commons VFS is a Virtual File System library.

There is a newer version: 2.9.0

/*
 * 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.apache.commons.vfs2;

/**
 * The user authenticator is used to query credentials from the user. Since a UserAuthenticator is provided with the
 * {@link FileSystemOptions} to a {@link FileSystem} it should also implement reasonable equals and hashCode functions
 * if the FileSystem should be shared.
 */
public interface UserAuthenticator {
    /**
     * Queries the given type from the user.
     *
     * @param types An array containing the user's credentials
     * @return The UserAuthenticationData.
     */
    UserAuthenticationData requestAuthentication(UserAuthenticationData.Type[] types);
}