/**
* 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);