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YUI.add('datasource-function', function (Y, NAME) {
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/**
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 * Provides a DataSource implementation which can be used to retrieve data from
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 * a custom function.
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 *
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 * @module datasource
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 * @submodule datasource-function
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 */
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/**
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 * Function subclass for the DataSource Utility.
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 * @class DataSource.Function
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 * @extends DataSource.Local
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 * @constructor
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 */
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var LANG = Y.Lang,
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    DSFn = function() {
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        DSFn.superclass.constructor.apply(this, arguments);
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    };
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    /////////////////////////////////////////////////////////////////////////////
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    //
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    // DataSource.Function static properties
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    //
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    /////////////////////////////////////////////////////////////////////////////
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Y.mix(DSFn, {
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    /**
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     * Class name.
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     *
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     * @property NAME
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     * @type String
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     * @static
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     * @final
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     * @value "dataSourceFunction"
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     */
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    NAME: "dataSourceFunction",
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    /////////////////////////////////////////////////////////////////////////////
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    //
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    // DataSource.Function Attributes
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    //
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    /////////////////////////////////////////////////////////////////////////////
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    ATTRS: {
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        /**
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        * Stores the function that will serve the response data.
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        *
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        * @attribute source
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        * @type {Any}
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        * @default null
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        */
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        source: {
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            validator: LANG.isFunction
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        }
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    }
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});
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Y.extend(DSFn, Y.DataSource.Local, {
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    /**
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     * Passes query data to the source function. Fires <code>response</code>
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     * event with the function results (synchronously).
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     *
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     * @method _defRequestFn
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     * @param e {EventFacade} Event Facade with the following properties:
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     * <dl>
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     * <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd>
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     * <dt>request (Object)</dt> <dd>The request.</dd>
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     * <dt>callback (Object)</dt> <dd>The callback object with the following
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     * properties:
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     *     <dl>
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     *         <dt>success (Function)</dt> <dd>Success handler.</dd>
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     *         <dt>failure (Function)</dt> <dd>Failure handler.</dd>
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     *     </dl>
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     * </dd>
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     * <dt>cfg (Object)</dt> <dd>Configuration object.</dd>
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     * </dl>
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     * @protected
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     */
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    _defRequestFn: function(e) {
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        var fn = this.get("source"),
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            payload = e.details[0];
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        if (fn) {
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            try {
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                payload.data = fn(e.request, this, e);
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            } catch (ex) {
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                payload.error = ex;
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            }
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        } else {
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            payload.error = new Error("Function data failure");
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        }
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        this.fire("data", payload);
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        return e.tId;
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    }
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});
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Y.DataSource.Function = DSFn;
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}, '3.18.1', {"requires": ["datasource-local"]});