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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.                                           *
 ****************************************************************/

package org.apache.james.transport.mailets;

import org.apache.mailet.GenericMailet;
import org.apache.mailet.Mail;
import org.apache.mailet.MailetException;
import java.util.Iterator;
import java.util.ArrayList;
import java.util.StringTokenizer;
import javax.mail.MessagingException;

/**
 * This mailet sets attributes on the Mail.
 * 
 * Sample configuration:
 * <mailet match="All" class="RemoveMailAttribute">
 *   <name>attribute_name1</name>
 *   <name>attribute_name2</name>
 * </mailet>
 *
 * @version CVS $Revision: 494012 $ $Date: 2007-01-08 11:23:58 +0100 (Mo, 08 Jan 2007) $
 * @since 2.2.0
 */
public class RemoveMailAttribute extends GenericMailet {
    
    private ArrayList attributesToRemove = new ArrayList();
    
    /**
     * Return a string describing this mailet.
     *
     * @return a string describing this mailet
     */
    public String getMailetInfo() {
        return "Remove Mail Attribute Mailet";
    }

    /**
     * Initialize the mailet
     *
     * @throws MailetException if the processor parameter is missing
     */
    public void init() throws MailetException
    {
        String name = getInitParameter("name");

        if (name != null) {
            StringTokenizer st = new StringTokenizer(name, ",") ;
            while (st.hasMoreTokens()) {
                String attribute_name = st.nextToken().trim() ;
                attributesToRemove.add(attribute_name);
            }
        }
    }

    /**
     * Remove the configured attributes
     *
     * @param mail the mail to process
     *
     * @throws MessagingException in all cases
     */
    public void service(Mail mail) throws MessagingException {
        Iterator iter = attributesToRemove.iterator();
        while (iter.hasNext()) {
            String attribute_name = iter.next().toString();
            mail.removeAttribute (attribute_name);
        }
    }
    

}