/*
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 * 
 * The Original Code is Mozilla XPCOM Dictionary.
 * 
 * The Initial Developer of the Original Code is Digital Creations 2, Inc.
 * Portions created by Digital Creations 2, Inc. are Copyright (C) 2000 Digital
 * Creations 2, Inc.  All Rights Reserved.
 * 
 * Contributor(s): Martijn Pieters <mj@digicool.com> (original author)
 */

/*
 *  Simple dictionary implementation.
 *  Version: $Revision: 1.1.180.1 $
 *
 *  $Id: nsIDictionary.idl,v 1.1.180.1 2002/04/10 02:44:21 cltbld%netscape.com Exp $
 */

#include "nsISupports.idl"

/**
 * A simple mutable table of objects, accessed by key.
 */
[scriptable, uuid(1dd0cb45-aea3-4a52-8b29-01429a542863)]
interface nsIDictionary: nsISupports {
    /**
     * Check if a given key is present in the dictionary.
     *
     * @param key       Key to check for
     * @return          true if present, false if absent.
     */
    boolean hasKey(in string key);

    /**
     * Retrieve all keys in the dictionary.
     *
     * @return          array of all keys, unsorted.
     */
    void getKeys(out PRUint32 count,
        [retval, array, size_is(count)] out string keys);
    
    /**
     * Find the value indicated by the key.
     *
     * @param key       The lookup key indicating the value.
     * @return          Value indicated by key. If the key doesn't exist,
     *                  NS_ERROR_FAILURE will be returned.
     */
    nsISupports getValue(in string key);

    /**
     * Add the key-value pair to the dictionary.
     * If the key is already present, replace the old value
     * with the new.
     *
     * @param key       The key by which the value can be accessed
     * @param value     The value to be stored.
     */
    void setValue(in string key, in nsISupports value);
    
    /**
     * Delete the indicated key-value pair.
     *
     * @param key       The key indicating the pair to be removed.
     * @return          The removed value. If the key doesn't exist,
     *                  NS_ERROR_FAILURE will be returned.
     */
    nsISupports deleteValue(in string key);

    /**
     * Delete all key-value pairs from the dictionary.
     */
    void clear();
};

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