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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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */
package com.facebook.presto.jdbc.internal.apache.http.client;

import com.facebook.presto.jdbc.internal.apache.http.auth.AuthScope;
import com.facebook.presto.jdbc.internal.apache.http.auth.Credentials;

/**
 * Abstract credentials provider that maintains a collection of user
 * credentials.
 * 
 * Implementations of this interface must be thread-safe. Access to shared
 * data must be synchronized as methods of this interface may be executed
 * from multiple threads.
 *
 * @since 4.0
 */
public interface CredentialsProvider {

    /**
     * Sets the {@link Credentials credentials} for the given authentication
     * scope. Any previous credentials for the given scope will be overwritten.
     *
     * @param authscope the {@link AuthScope authentication scope}
     * @param credentials the authentication {@link Credentials credentials}
     * for the given scope.
     *
     * @see #getCredentials(AuthScope)
     */
    void setCredentials(AuthScope authscope, Credentials credentials);

    /**
     * Get the {@link Credentials credentials} for the given authentication scope.
     *
     * @param authscope the {@link AuthScope authentication scope}
     * @return the credentials
     *
     * @see #setCredentials(AuthScope, Credentials)
     */
    Credentials getCredentials(AuthScope authscope);

    /**
     * Clears all credentials.
     */
    void clear();

}