package net.myvietnam.mvncore.configuration;

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 * The Apache Software License, Version 1.1
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 * Copyright (c) 1999-2002 The Apache Software Foundation.  All rights
 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
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 * ====================================================================
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 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

import java.util.Iterator;

import org.apache.commons.collections.SequencedHashMap;

/**
 * Basic configuration classe. Stores the configuration data but does not
 * provide any load or save functions. If you want to load your Configuration
 * from a file use PropertiesConfiguration or XmlConfiguration.
 *
 * This class extends normal Java properties by adding the possibility
 * to use the same key many times concatenating the value strings
 * instead of overwriting them.
 *
 * @author <a href="mailto:stefano@apache.org">Stefano Mazzocchi
 * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens
 * @author <a href="mailto:daveb@miceda-data">Dave Bryson
 * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.
 * @author <a href="mailto:leon@opticode.co.za">Leon Messerschmidt
 * @author <a href="mailto:kjohnson@transparent.com">Kent Johnson
 * @author <a href="mailto:dlr@finemaltcoding.com">Daniel Rall
 * @author <a href="mailto:ipriha@surfeu.fi">Ilkka Priha
 * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl
 * @author <a href="mailto:mpoeschl@marmot.at">Martin Poeschl
 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen
 * @author <a href="mailto:ksh@scand.com">Konstantin Shaposhnikov
 * @author <a href="mailto:oliver.heger@t-online.de">Oliver Heger
 *
 * @version $Id: BaseConfiguration.java,v 1.1 2003/12/09 08:25:30 huumai Exp $
 */
public class BaseConfiguration extends AbstractConfiguration
{
    /** stores the configuration key-value pairs */
    private SequencedHashMap store = new SequencedHashMap();

    /**
     * Empty constructor.  You must add all the values to this configuration.
     */
    public BaseConfiguration()
    {
        super();
    }

    /**
     * Creates an empty BaseConfiguration object with
     * a Super-Object which is queries for every key.
     *
     * @param defaults Configuration defaults to use if key not in file
     */
    public BaseConfiguration(Configuration defaults)
    {
        super(defaults);
    }

    /**
     * Adds a key/value pair to the map.  This routine does no magic morphing.
     * It ensures the keylist is maintained
     *
     * @param key key to use for mapping
     * @param obj object to store
     */
    protected void addPropertyDirect(String key, Object obj)
    {
        Object o = getPropertyDirect(key);
        Object objAdd = null;

        if(o == null)
        {
            objAdd = obj;
        }
        else
        {
            if (o instanceof Container)
            {
                ((Container) o).add(obj);
            }
            else
            {
                // The token key is not a container.
                Container c = new Container();

                // There is an element. Put it into the container
                // at the first position
                c.add(o);

                // Now gobble up the supplied object
                c.add(obj);

                objAdd = c;
            }
        }

        if(objAdd != null)
        {
            store.put(key, objAdd);
        }
    }

    /**
     * Read property from underlying map.
     *
     * @param key key to use for mapping
     *
     * @return object associated with the given configuration key.
     */
    protected Object getPropertyDirect(String key)
    {
        return store.get(key);
    }

    /**
     * Check if the configuration is empty
     *
     * @return <code>true if Configuration is empty,
     * <code>false otherwise.
     */
    public boolean isEmpty()
    {
        return store.isEmpty();
    }

    /**
     * check if the configuration contains the key
     *
     * @param key the configuration key
     *
     * @return <code>true if Configuration contain given key,
     * <code>false otherwise.
     */
    public boolean containsKey(String key)
    {
        return store.containsKey(key);
    }

    /**
     * Clear a property in the configuration.
     *
     * @param key the key to remove along with corresponding value.
     */
    public void clearProperty(String key)
    {
        if (containsKey(key))
        {
            store.remove(key);
        }
    }

    /**
     * Get the list of the keys contained in the configuration
     * repository.
     *
     * @return An Iterator.
     */
    public Iterator getKeys()
    {
        return store.iterator();
    }
}