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/*
* $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/auth/AuthSchemeRegistry.java $
* $Revision: 652950 $
* $Date: 2008-05-02 16:49:48 -0700 (Fri, 02 May 2008) $
*
* ====================================================================
*
* 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.auth;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import org.apache.http.params.HttpParams;
/**
* Authentication scheme registry that can be used to obtain the corresponding
* authentication scheme implementation for a given type of authorization challenge.
*
* @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
*
*
* @version $Revision: 652950 $
* @since 4.0
*/
public final class AuthSchemeRegistry {
private final Map<String,AuthSchemeFactory> registeredSchemes;
public AuthSchemeRegistry() {
super();
this.registeredSchemes = new LinkedHashMap<String,AuthSchemeFactory>();
}
/**
* Registers a {@link AuthSchemeFactory} with the given identifier. If a factory with the
* given name already exists it will be overridden. This name is the same one used to
* retrieve the {@link AuthScheme authentication scheme} from {@link #getAuthScheme}.
*
* <p>
* Please note that custom authentication preferences, if used, need to be updated accordingly
* for the new {@link AuthScheme authentication scheme} to take effect.
* </p>
*
* @param name the identifier for this scheme
* @param factory the {@link AuthSchemeFactory} class to register
*
* @see #getAuthScheme
*/
public synchronized void register(
final String name,
final AuthSchemeFactory factory) {
if (name == null) {
throw new IllegalArgumentException("Name may not be null");
}
if (factory == null) {
throw new IllegalArgumentException("Authentication scheme factory may not be null");
}
registeredSchemes.put(name.toLowerCase(Locale.ENGLISH), factory);
}
/**
* Unregisters the class implementing an {@link AuthScheme authentication scheme} with
* the given name.
*
* @param name the identifier of the class to unregister
*/
public synchronized void unregister(final String name) {
if (name == null) {
throw new IllegalArgumentException("Name may not be null");
}
registeredSchemes.remove(name.toLowerCase(Locale.ENGLISH));
}
/**
* Gets the {@link AuthScheme authentication scheme} with the given name.
*
* @param name the {@link AuthScheme authentication scheme} identifier
* @param params the {@link HttpParams HTTP parameters} for the authentication
* scheme.
*
* @return {@link AuthScheme authentication scheme}
*
* @throws IllegalStateException if a scheme with the given name cannot be found
*/
public synchronized AuthScheme getAuthScheme(final String name, final HttpParams params)
throws IllegalStateException {
if (name == null) {
throw new IllegalArgumentException("Name may not be null");
}
AuthSchemeFactory factory = registeredSchemes.get(name.toLowerCase(Locale.ENGLISH));
if (factory != null) {
return factory.newInstance(params);
} else {
throw new IllegalStateException("Unsupported authentication scheme: " + name);
}
}
/**
* Obtains a list containing names of all registered {@link AuthScheme authentication
* schemes} in their default order.
*
* @return list of registered scheme names
*/
public synchronized List<String> getSchemeNames() {
return new ArrayList<String>(registeredSchemes.keySet());
}
/**
* Populates the internal collection of registered {@link AuthScheme authentication schemes}
* with the content of the map passed as a parameter.
*
* @param map authentication schemes
*/
public synchronized void setItems(final Map<String, AuthSchemeFactory> map) {
if (map == null) {
return;
}
registeredSchemes.clear();
registeredSchemes.putAll(map);
}
}
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