# Yahoo! UI Library

### datasource 3.0.0b1

Yahoo! UI Library > datasource > datasource-jsonschema.js (source view)
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    /**
     * Extends DataSource with schema-parsing on JSON data.
     *
     * @module datasource
     * @submodule datasource-jsonschema
     */

    /**
     * Adds schema-parsing to the DataSource Utility.
     * @class DataSourceJSONSchema
     * @extends Plugin.Base
     */
    var DataSourceJSONSchema = function() {
        DataSourceJSONSchema.superclass.constructor.apply(this, arguments);
    };

    Y.mix(DataSourceJSONSchema, {
        /**
         * The namespace for the plugin. This will be the property on the host which
         * references the plugin instance.
         *
         * @property NS
         * @type String
         * @static
         * @final
         * @value "schema"
         */
        NS: "schema",

        /**
         * Class name.
         *
         * @property NAME
         * @type String
         * @static
         * @final
         * @value "dataSourceJSONSchema"
         */
        NAME: "dataSourceJSONSchema",

        /////////////////////////////////////////////////////////////////////////////
        //
        // DataSourceJSONSchema Attributes
        //
        /////////////////////////////////////////////////////////////////////////////

        ATTRS: {
            schema: {
                //value: {}
            }
        }
    });

    Y.extend(DataSourceJSONSchema, Y.Plugin.Base, {
        /**
        * Internal init() handler.
        *
        * @method initializer
        * @param config {Object} Config object.
        * @private
        */
        initializer: function(config) {
            this.doBefore("_defDataFn", this._beforeDefDataFn);
        },

        /**
         * Parses raw data into a normalized response.
         *
         * @method _beforeDefDataFn
         * <dl>
         * <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd>
         * <dt>request (Object)</dt> <dd>The request.</dd>
         * <dt>callback (Object)</dt> <dd>The callback object with the following properties:
         *     <dl>
         *         <dt>success (Function)</dt> <dd>Success handler.</dd>
         *         <dt>failure (Function)</dt> <dd>Failure handler.</dd>
         *     </dl>
         * </dd>
         * <dt>data (Object)</dt> <dd>Raw data.</dd>
         * </dl>
         * @protected
         */
        _beforeDefDataFn: function(e) {
            var data = (Y.DataSource.IO && (this.get("host") instanceof Y.DataSource.IO) && Y.Lang.isString(e.data.responseText)) ? e.data.responseText : e.data,
                response = Y.DataSchema.JSON.apply(this.get("schema"), data);

            // Default
            if(!response) {
                response = {
                    meta: {},
                    results: data
                };
            }

            this.get("host").fire("response", Y.mix({response:response}, e));
            return new Y.Do.Halt("DataSourceJSONSchema plugin halted _defDataFn");
        }
    });

    Y.namespace('Plugin').DataSourceJSONSchema = DataSourceJSONSchema;

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