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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 org.apache.http.client;

import org.apache.http.auth.AuthScope;
import org.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();

}