/*
 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/impl/cookie/AbstractCookieSpec.java $
 * $Revision: 617207 $
 * $Date: 2008-01-31 12:14:12 -0800 (Thu, 31 Jan 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.impl.cookie;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.apache.http.cookie.CookieAttributeHandler;
import org.apache.http.cookie.CookieSpec;

/**
 * Abstract cookie specification which can delegate the job of parsing,
 * validation or matching cookie attributes to a number of arbitrary 
 * {@link CookieAttributeHandler}s.
 * 
 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
 * 
 * @since 4.0 
 */
public abstract class AbstractCookieSpec implements CookieSpec {
    
    /**
    * Stores attribute name -> attribute handler mappings
    */
    private final Map<String, CookieAttributeHandler> attribHandlerMap;

    /** 
     * Default constructor 
     * */
    public AbstractCookieSpec() {
        super();
        this.attribHandlerMap = new HashMap<String, CookieAttributeHandler>(10);        
    }

    public void registerAttribHandler(
            final String name, final CookieAttributeHandler handler) {
        if (name == null) {
            throw new IllegalArgumentException("Attribute name may not be null");
        }
        if (handler == null) {
            throw new IllegalArgumentException("Attribute handler may not be null");
        }
        this.attribHandlerMap.put(name, handler);
    }
    
    /**
     * Finds an attribute handler {@link CookieAttributeHandler} for the
     * given attribute. Returns <tt>null</tt> if no attribute handler is
     * found for the specified attribute.
     *
     * @param name attribute name. e.g. Domain, Path, etc.
     * @return an attribute handler or <tt>null</tt>
     */
    protected CookieAttributeHandler findAttribHandler(final String name) {
        return this.attribHandlerMap.get(name);
    }
    
    /**
     * Gets attribute handler {@link CookieAttributeHandler} for the
     * given attribute.
     *
     * @param name attribute name. e.g. Domain, Path, etc.
     * @throws IllegalStateException if handler not found for the
     *          specified attribute.
     */
    protected CookieAttributeHandler getAttribHandler(final String name) {
        CookieAttributeHandler handler = findAttribHandler(name);
        if (handler == null) {
            throw new IllegalStateException("Handler not registered for " +
                                            name + " attribute.");
        } else {
            return handler;
        }
    }

    protected Collection<CookieAttributeHandler> getAttribHandlers() {
        return this.attribHandlerMap.values();
    }
    
}