/**
* @class Ext.data.DataReader
* Abstract base class for reading structured data from a data source and converting
* it into an object containing {@link Ext.data.Record} objects and metadata for use
* by an {@link Ext.data.Store}. This class is intended to be extended and should not
* be created directly. For existing implementations, see {@link Ext.data.ArrayReader},
* {@link Ext.data.JsonReader} and {@link Ext.data.XmlReader}.
* @constructor Create a new DataReader
* @param {Object} meta Metadata configuration options (implementation-specific).
* @param {Array/Object} recordType
* Either an Array of {@link Ext.data.Field Field} definition objects (which
* will be passed to {@link Ext.data.Record#create}, or a {@link Ext.data.Record Record}
* constructor created using {@link Ext.data.Record#create}.
*/
Ext.data.DataReader = function(meta, recordType){
/**
* This DataReader's configured metadata as passed to the constructor.
* @type Mixed
* @property meta
*/
this.meta = meta;
/**
* @cfg {Array/Object} fields
* Either an Array of {@link Ext.data.Field Field} definition objects (which
* will be passed to {@link Ext.data.Record#create}, or a {@link Ext.data.Record Record}
* constructor created from {@link Ext.data.Record#create}.
*/
this.recordType = Ext.isArray(recordType) ?
Ext.data.Record.create(recordType) : recordType;
// make sure extraction functions are defined.
this.buildExtractors();
};
Ext.data.DataReader.prototype = {
/**
* Abstract method, overridden in {@link Ext.data.JsonReader}
*/
buildExtractors : Ext.emptyFn,
/**
* Used for un-phantoming a record after a successful database insert. Sets the records pk along with new data from server.
* You must return at least the database pk using the idProperty defined in your DataReader configuration. The incoming
* data from server will be merged with the data in the local record.
* In addition, you must return record-data from the server in the same order received.
* Will perform a commit as well, un-marking dirty-fields. Store's "update" event will be suppressed.
* @param {Record/Record[]} record The phantom record to be realized.
* @param {Object/Object[]} data The new record data to apply. Must include the primary-key from database defined in idProperty field.
*/
realize: function(rs, data){
if (Ext.isArray(rs)) {
for (var i = rs.length - 1; i >= 0; i--) {
// recurse
if (Ext.isArray(data)) {
this.realize(rs.splice(i,1).shift(), data.splice(i,1).shift());
}
else {
// weird...rs is an array but data isn't?? recurse but just send in the whole invalid data object.
// the else clause below will detect !this.isData and throw exception.
this.realize(rs.splice(i,1).shift(), data);
}
}
}
else {
// If rs is NOT an array but data IS, see if data contains just 1 record. If so extract it and carry on.
if (Ext.isArray(data) && data.length == 1) {
data = data.shift();
}
if (!this.isData(data)) {
// TODO: Let exception-handler choose to commit or not rather than blindly rs.commit() here.
//rs.commit();
throw new Ext.data.DataReader.Error('realize', rs);
}
var values = this.extractValues(data, rs.fields.items, rs.fields.items.length);
rs.phantom = false; // <-- That's what it's all about
rs._phid = rs.id; // <-- copy phantom-id -> _phid, so we can remap in Store#onCreateRecords
rs.id = data[this.meta.idProperty];
rs.data = values;
rs.commit();
}
},
/**
* Used for updating a non-phantom or "real" record's data with fresh data from server after remote-save.
* If returning data from multiple-records after a batch-update, you must return record-data from the server in
* the same order received. Will perform a commit as well, un-marking dirty-fields. Store's "update" event will be
* suppressed as the record receives fresh new data-hash
* @param {Record/Record[]} rs
* @param {Object/Object[]} data
*/
update : function(rs, data) {
if (Ext.isArray(rs)) {
for (var i=rs.length-1; i >= 0; i--) {
if (Ext.isArray(data)) {
this.update(rs.splice(i,1).shift(), data.splice(i,1).shift());
}
else {
// weird...rs is an array but data isn't?? recurse but just send in the whole data object.
// the else clause below will detect !this.isData and throw exception.
this.update(rs.splice(i,1).shift(), data);
}
}
}
else {
// If rs is NOT an array but data IS, see if data contains just 1 record. If so extract it and carry on.
if (Ext.isArray(data) && data.length == 1) {
data = data.shift();
}
if (this.isData(data)) {
rs.data = this.extractValues(Ext.apply(rs.data, data), rs.fields.items, rs.fields.items.length);
}
rs.commit();
}
},
/**
* Returns true if the supplied data-hash looks and quacks like data. Checks to see if it has a key
* corresponding to idProperty defined in your DataReader config containing non-empty pk.
* @param {Object} data
* @return {Boolean}
*/
isData : function(data) {
return (data && Ext.isObject(data) && !Ext.isEmpty(data[this.meta.idProperty])) ? true : false;
}
};
/**
* @class Ext.data.DataReader.Error
* @extends Ext.Error
* General error class for Ext.data.DataReader
*/
Ext.data.DataReader.Error = Ext.extend(Ext.Error, {
constructor : function(message, arg) {
this.arg = arg;
Ext.Error.call(this, message);
},
name: 'Ext.data.DataReader'
});
Ext.apply(Ext.data.DataReader.Error.prototype, {
lang : {
'update': "#update received invalid data from server. Please see docs for DataReader#update and review your DataReader configuration.",
'realize': "#realize was called with invalid remote-data. Please see the docs for DataReader#realize and review your DataReader configuration.",
'invalid-response': "#readResponse received an invalid response from the server."
}
});