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Java example source code file (AuthSchemeRegistry.java)

This example source code file (AuthSchemeRegistry.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, authschemefactory, authschemeregistry, guardedby, httpparams, illegalargumentexception, illegalstateexception, linkedhashmap, list, map, name, string, threadsafe, unsupported, util

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

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.
 *  
 * @since 4.0
 */
@ThreadSafe
public final class AuthSchemeRegistry {

    @GuardedBy("this")
    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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