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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.cookie;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.http.HttpRequest;
import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.config.Lookup;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.ExecutionContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.Args;

/**
 * Cookie specification registry that can be used to obtain the corresponding
 * cookie specification implementation for a given type of type or version of
 * cookie.
 *
 * @since 4.0
 *
 * @deprecated (4.3) use {@link org.apache.http.config.Registry}.
 */
@Contract(threading = ThreadingBehavior.SAFE)
@Deprecated
public final class CookieSpecRegistry implements Lookup {

    private final ConcurrentHashMap registeredSpecs;

    public CookieSpecRegistry() {
        super();
        this.registeredSpecs = new ConcurrentHashMap();
    }

    /**
     * Registers a {@link CookieSpecFactory} with the given identifier.
     * If a specification with the given name already exists it will be overridden.
     * This nameis the same one used to retrieve the {@link CookieSpecFactory}
     * from {@link #getCookieSpec(String)}.
     *
     * @param name the identifier for this specification
     * @param factory the {@link CookieSpecFactory} class to register
     *
     * @see #getCookieSpec(String)
     */
    public void register(final String name, final CookieSpecFactory factory) {
         Args.notNull(name, "Name");
        Args.notNull(factory, "Cookie spec factory");
        registeredSpecs.put(name.toLowerCase(Locale.ENGLISH), factory);
    }

    /**
     * Unregisters the {@link CookieSpecFactory} with the given ID.
     *
     * @param id the identifier of the {@link CookieSpec cookie specification} to unregister
     */
    public void unregister(final String id) {
         Args.notNull(id, "Id");
         registeredSpecs.remove(id.toLowerCase(Locale.ENGLISH));
    }

    /**
     * Gets the {@link CookieSpec cookie specification} with the given ID.
     *
     * @param name the {@link CookieSpec cookie specification} identifier
     * @param params the {@link HttpParams HTTP parameters} for the cookie
     *  specification.
     *
     * @return {@link CookieSpec cookie specification}
     *
     * @throws IllegalStateException if a policy with the given name cannot be found
     */
    public CookieSpec getCookieSpec(final String name, final HttpParams params)
        throws IllegalStateException {

        Args.notNull(name, "Name");
        final CookieSpecFactory factory = registeredSpecs.get(name.toLowerCase(Locale.ENGLISH));
        if (factory != null) {
            return factory.newInstance(params);
        } else {
            throw new IllegalStateException("Unsupported cookie spec: " + name);
        }
    }

    /**
     * Gets the {@link CookieSpec cookie specification} with the given name.
     *
     * @param name the {@link CookieSpec cookie specification} identifier
     *
     * @return {@link CookieSpec cookie specification}
     *
     * @throws IllegalStateException if a policy with the given name cannot be found
     */
    public CookieSpec getCookieSpec(final String name)
        throws IllegalStateException {
        return getCookieSpec(name, null);
    }

    /**
     * Obtains a list containing the names of all registered {@link CookieSpec cookie
     * specs}.
     *
     * Note that the DEFAULT policy (if present) is likely to be the same
     * as one of the other policies, but does not have to be.
     *
     * @return list of registered cookie spec names
     */
    public List getSpecNames(){
        return new ArrayList(registeredSpecs.keySet());
    }

    /**
     * Populates the internal collection of registered {@link CookieSpec cookie
     * specs} with the content of the map passed as a parameter.
     *
     * @param map cookie specs
     */
    public void setItems(final Map map) {
        if (map == null) {
            return;
        }
        registeredSpecs.clear();
        registeredSpecs.putAll(map);
    }

    @Override
    public CookieSpecProvider lookup(final String name) {
        return new CookieSpecProvider() {

            @Override
            public CookieSpec create(final HttpContext context) {
                final HttpRequest request = (HttpRequest) context.getAttribute(
                        ExecutionContext.HTTP_REQUEST);
                return getCookieSpec(name, request.getParams());
            }

        };
    }

}