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Java example source code file (BasicCredentialsProvider.java)

This example source code file (BasicCredentialsProvider.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

authentication, authscope, basiccredentialsprovider, credentials, guardedby, hashmap, illegalargumentexception, override, string, threadsafe, util

The BasicCredentialsProvider.java example source code

 * ====================================================================
 *  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
 * <http://www.apache.org/>.

package org.apache.http.impl.client;

import java.util.HashMap;

import org.apache.http.annotation.GuardedBy;
import org.apache.http.annotation.ThreadSafe;

import org.apache.http.auth.AuthScope;
import org.apache.http.auth.Credentials;
import org.apache.http.client.CredentialsProvider;

 * Default implementation of {@link CredentialsProvider}.
 * @since 4.0
public class BasicCredentialsProvider implements CredentialsProvider {

    private final HashMap<AuthScope, Credentials> credMap;

     * Default constructor.
    public BasicCredentialsProvider() {
        this.credMap = new HashMap<AuthScope, Credentials>();

    public synchronized void setCredentials(
            final AuthScope authscope, 
            final Credentials credentials) {
        if (authscope == null) {
            throw new IllegalArgumentException("Authentication scope may not be null");
        credMap.put(authscope, credentials);

     * Find matching {@link Credentials credentials} for the given authentication scope.
     * @param map the credentials hash map
     * @param authscope the {@link AuthScope authentication scope}
     * @return the credentials 
    private static Credentials matchCredentials(
            final HashMap<AuthScope, Credentials> map, 
            final AuthScope authscope) {
        // see if we get a direct hit
        Credentials creds = map.get(authscope);
        if (creds == null) {
            // Nope.
            // Do a full scan
            int bestMatchFactor  = -1;
            AuthScope bestMatch  = null;
            for (AuthScope current: map.keySet()) {
                int factor = authscope.match(current);
                if (factor > bestMatchFactor) {
                    bestMatchFactor = factor;
                    bestMatch = current;
            if (bestMatch != null) {
                creds = map.get(bestMatch);
        return creds;
    public synchronized Credentials getCredentials(final AuthScope authscope) {
        if (authscope == null) {
            throw new IllegalArgumentException("Authentication scope may not be null");
        return matchCredentials(this.credMap, authscope);

    public String toString() {
        return credMap.toString();
    public synchronized void clear() {

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