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 * to you under the Apache License, Version 2.0 (the            *
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package org.apache.james.imap.decode.base;

import org.apache.james.imap.api.ImapCommand;
import org.apache.james.imap.api.ImapMessage;
import org.apache.james.imap.api.display.HumanReadableText;
import org.apache.james.imap.api.message.response.StatusResponseFactory;
import org.apache.james.imap.api.process.ImapSession;
import org.apache.james.imap.decode.ImapRequestLineReader;
import org.apache.james.imap.decode.MessagingImapCommandParser;
import org.apache.james.protocols.imap.DecodingException;

/**
 * 
 * Note:
 * 
 */
public abstract class AbstractImapCommandParser implements MessagingImapCommandParser {

    private final ImapCommand command;

    private StatusResponseFactory statusResponseFactory;

    public AbstractImapCommandParser(final ImapCommand command) {
        super();
        this.command = command;
    }

    public ImapCommand getCommand() {
        return command;
    }

    /**
     * @see org.apache.james.imap.decode.MessagingImapCommandParser#getStatusResponseFactory()
     */
    public final StatusResponseFactory getStatusResponseFactory() {
        return statusResponseFactory;
    }

    /**
     * @see org.apache.james.imap.decode.MessagingImapCommandParser#setStatusResponseFactory
     * (org.apache.james.imap.api.message.response.StatusResponseFactory)
     */
    public final void setStatusResponseFactory(StatusResponseFactory statusResponseFactory) {
        this.statusResponseFactory = statusResponseFactory;
    }

    /**
     * Parses a request into a command message for later processing.
     * 
     * @param request
     *            ImapRequestLineReader, not null
     * @return ImapCommandMessage, not null
     */
    public final ImapMessage parse(ImapRequestLineReader request, String tag, ImapSession session) {
        ImapMessage result;
        if (!command.validForState(session.getState())) {
            result = statusResponseFactory.taggedNo(tag, command, HumanReadableText.INVALID_COMMAND);
        } else {
            try {

                result = decode(command, request, tag, session);
            } catch (DecodingException e) {
                if (session.getLog().isDebugEnabled()) {
                    session.getLog().debug("Cannot parse protocol ", e);
                }
                result = statusResponseFactory.taggedBad(tag, command, e.getKey());
            }
        }
        return result;
    }

    /**
     * Parses a request into a command message for later processing.
     * 
     * @param command
     *            ImapCommand to be parsed, not null
     * @param request
     *            ImapRequestLineReader, not null
     * @param tag
     *            command tag, not null
     * @param session
     *            imap session
     * @return ImapCommandMessage, not null
     * @throws DecodingException
     *             if the request cannot be parsed
     */
    protected abstract ImapMessage decode(ImapCommand command, ImapRequestLineReader request, String tag, ImapSession session) throws DecodingException;

}