/gecko_sdk/idl/nsIProperties.idl

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#include "nsISupports.idl"

/*
 * Simple mapping service interface.
 * @status FROZEN
 */

[scriptable, uuid(78650582-4e93-4b60-8e85-26ebd3eb14ca)]
interface nsIProperties : nsISupports
{
    /**
     * Gets a property with a given name. 
     *
     * @return NS_ERROR_FAILURE if a property with that name doesn't exist.
     * @return NS_ERROR_NO_INTERFACE if the found property fails to QI to the 
     * given iid.
     */
    void get(in string prop, in nsIIDRef iid, 
             [iid_is(iid),retval] out nsQIResult result);

    /**
     * Sets a property with a given name to a given value. 
     */
    void set(in string prop, in nsISupports value);

    /**
     * Returns true if the property with the given name exists.
     */
    boolean has(in string prop);

    /**
     * Undefines a property.
     * @return NS_ERROR_FAILURE if a property with that name doesn't
     * already exist.
     */
    void undefine(in string prop);

    /**
     *  Returns an array of the keys.
     */
    void getKeys(out PRUint32 count, [array, size_is(count), retval] out string keys);
};