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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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 * 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   *
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package org.apache.jsieve.mailet;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import javax.mail.MessagingException;

import org.apache.jsieve.mail.Action;
import org.apache.jsieve.mail.ActionFileInto;
import org.apache.jsieve.mail.ActionKeep;
import org.apache.jsieve.mail.ActionRedirect;
import org.apache.jsieve.mail.ActionReject;
import org.apache.mailet.Mail;

/**
 * Dynamically dispatches an Action depending on the type of Action received at runtime. 
 * Thread Safety
 * An instance maybe safe accessed concurrently by multiple threads.
 */
public class ActionDispatcher
{   
    /**
     * A Map keyed by the type of Action. The values are the methods to invoke to 
     * handle the Action.
     * 
     */ 
    private ConcurrentMap fieldMailActionMap;

    /**
     * Constructor for ActionDispatcher.
     * @throws NoSuchMethodException 
     */
    public ActionDispatcher() throws MessagingException
    {
        super();
        setMethodMap(defaultMethodMap());
    }

    /**
     * Method execute executes the passed Action by invoking the method mapped by the
     * receiver with a parameter of the EXACT type of Action.
     * @param anAction not null
     * @param aMail not null
     * @param context not null
     * @throws MessagingException
     */
    public void execute(final Action anAction, final Mail aMail, final ActionContext context) throws MessagingException
    {
        final MailAction mailAction = getMethodMap().get(anAction.getClass());
        mailAction.execute(anAction, aMail, context);
    }

    /**
     * Returns the methodMap.
     * @return Map
     */
    public ConcurrentMap getMethodMap()
    {
        return fieldMailActionMap;
    }    

    /**
     * Returns a new methodMap.
     * @return Map
     */
    private ConcurrentMap defaultMethodMap()
    {
        final ConcurrentMap actionMap = new ConcurrentHashMap(4);
        actionMap.put(ActionFileInto.class, new FileIntoAction());
        actionMap.put(ActionKeep.class, new KeepAction());
        actionMap.put(ActionRedirect.class, new RedirectAction());
        actionMap.put(ActionReject.class, new RejectAction());
        return actionMap;
    }    

    /**
     * Sets the mail action mail.
     * @param mailActionMap  not null
     */
    protected void setMethodMap(ConcurrentMap  mailActionMap)
    {
        fieldMailActionMap = mailActionMap;
    }
}