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package org.apache.james.protocols.api;

import java.util.Collections;
import java.util.List;

/**
 * Protocol response to send to the client
 */
public interface Response {
    
    /**
     * Special {@link Response} implementation which will just disconnect the client
     */
    Response DISCONNECT = new Response() {

        @Override
        public String getRetCode() {
            return "";
        }

        @Override
        public List getLines() {
            return Collections.emptyList();
        }

        @Override
        public boolean isEndSession() {
            return true;
        }
        
    };
    
    
    /**
     * Return return-code
     * @return the return code
     */
    String getRetCode();

   
    /**
     * Return a List of all response lines stored in this Response. This should be used for encoding
     * the {@link Response} before sending it to the client.
     * 
     * @return all responseLines
     */
    List getLines();


    /**
     * Return true if the session is ended
     * 
     * @return true if session is ended
     */
    boolean isEndSession();

}