# Yahoo! UI Library

### dataschema 3.0.0

Yahoo! UI Library > dataschema > dataschema-array.js (source view)
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    /**
     * Provides a DataSchema implementation which can be used to work with data stored in arrays.
     *
     * @module dataschema
     * @submodule dataschema-array
     */

    /**
     * Array subclass for the DataSchema Utility.
     * @class DataSchema.Array
     * @extends DataSchema.Base
     * @static
     */
    var LANG = Y.Lang,

        SchemaArray = {

            /////////////////////////////////////////////////////////////////////////////
            //
            // DataSchema.Array static methods
            //
            /////////////////////////////////////////////////////////////////////////////
            /**
             * Applies a given schema to given Array data.
             *
             * @method apply
             * @param schema {Object} Schema to apply.
             * @param data {Object} Array data.
             * @return {Object} Schema-parsed data.
             * @static
             */
            apply: function(schema, data) {
                var data_in = data,
                    data_out = {results:[],meta:{}};

                if(LANG.isArray(data_in)) {
                    if(LANG.isArray(schema.resultFields)) {
                        // Parse results data
                        data_out = SchemaArray._parseResults(schema.resultFields, data_in, data_out);
                    }
                    else {
                        data_out.results = data_in;
                        Y.log("Schema resultFields property not found: " + Y.dump(schema), "warn", "dataschema-array");
                    }
                }
                else {
                    Y.log("Array data could not be schema-parsed: " + Y.dump(data) + " " + Y.dump(data), "error", "dataschema-array");
                    data_out.error = new Error("Array schema parse failure");
                }

                return data_out;
            },

            /**
             * Schema-parsed list of results from full data
             *
             * @method _parseResults
             * @param fields {Array} Schema to parse against.
             * @param array_in {Array} Array to parse.
             * @param data_out {Object} In-progress parsed data to update.
             * @return {Object} Parsed data object.
             * @static
             * @protected
             */
            _parseResults: function(fields, array_in, data_out) {
                var results = [],
                    result, item, type, field, key, value, i, j;

                for(i=array_in.length-1; i>-1; i--) {
                    result = {};
                    item = array_in[i];
                    type = (LANG.isObject(item) && !LANG.isFunction(item)) ? 2 : (LANG.isArray(item)) ? 1 : (LANG.isString(item)) ? 0 : -1;
                    if(type > 0) {
                        for(j=fields.length-1; j>-1; j--) {
                            field = fields[j];
                            key = (!LANG.isUndefined(field.key)) ? field.key : field;
                            value = (!LANG.isUndefined(item[key])) ? item[key] : item[j];
                            result[key] = Y.DataSchema.Base.parse(value, field);
                        }
                    }
                    else if(type === 0) {
                        result = item;
                    }
                    else {
                        //TODO: null or {}?
                        result = null;
                        Y.log("Unexpected type while parsing array: " + Y.dump(item), "warn", "dataschema-array");
                    }
                    results[i] = result;
                }
                data_out.results = results;

                return data_out;
            }
        };

    Y.DataSchema.Array = Y.mix(SchemaArray, Y.DataSchema.Base);

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