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Apache jSieve is a server side mail filtering system implementing RFC3028. Apache jSieve is developed by the JAMES project.

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package org.apache.jsieve;

import org.apache.jsieve.exception.SieveException;
import org.apache.jsieve.mail.MailAdapter;

/**
 * Interface ExecutableCommand defines the method signatures for Sieve Commands.
 */
public interface ExecutableCommand {
    /**
     * Method execute executes a Sieve Command.
     * 
     * @param mail -
     *            The mail against which the Command is executed.
     * @param arguments -
     *            The Command arguments
     * @param block -
     *            An optional Block to be evaluated
     * @param context
     *            SieveContext containing contextual information,
     *            not null
     * @return Object - The result of evaluating the Command
     * @throws SieveException
     */
    public Object execute(MailAdapter mail, Arguments arguments, Block block,
            SieveContext context) throws SieveException;

}