/*
+ * Based on:
+ * Ext JS Library 1.1.1
+ * Copyright(c) 2006-2007, Ext JS, LLC.
+ *
+ * Originally Released Under LGPL - original licence link has changed is not relivant.
+ *
+ * Fork - LGPL
+ * <script type="text/javascript">
+ */
+
+/**
+ * @class Roo.data.XmlReader
+ * @extends Roo.data.DataReader
+ * Data reader class to create an Array of {@link Roo.data.Record} objects from an XML document
+ * based on mappings in a provided Roo.data.Record constructor.<br><br>
+ * <p>
+ * <em>Note that in order for the browser to parse a returned XML document, the Content-Type
+ * header in the HTTP response must be set to "text/xml".</em>
+ * <p>
+ * Example code:
+ * <pre><code>
+var RecordDef = Roo.data.Record.create([
+ {name: 'name', mapping: 'name'}, // "mapping" property not needed if it's the same as "name"
+ {name: 'occupation'} // This field will use "occupation" as the mapping.
+]);
+var myReader = new Roo.data.XmlReader({
+ totalRecords: "results", // The element which contains the total dataset size (optional)
+ record: "row", // The repeated element which contains row information
+ id: "id" // The element within the row that provides an ID for the record (optional)
+}, RecordDef);
+</code></pre>
+ * <p>
+ * This would consume an XML file like this:
+ * <pre><code>
+<?xml?>
+<dataset>
+ <results>2</results>
+ <row>
+ <id>1</id>
+ <name>Bill</name>
+ <occupation>Gardener</occupation>
+ </row>
+ <row>
+ <id>2</id>
+ <name>Ben</name>
+ <occupation>Horticulturalist</occupation>
+ </row>
+</dataset>
+</code></pre>
+ * @cfg {String} totalRecords The DomQuery path from which to retrieve the total number of records
+ * in the dataset. This is only needed if the whole dataset is not passed in one go, but is being
+ * paged from the remote server.
+ * @cfg {String} record The DomQuery path to the repeated element which contains record information.
+ * @cfg {String} success The DomQuery path to the success attribute used by forms.
+ * @cfg {String} id The DomQuery path relative from the record element to the element that contains
+ * a record identifier value.
+ * @constructor
+ * Create a new XmlReader
+ * @param {Object} meta Metadata configuration options
+ * @param {Mixed} recordType The definition of the data record type to produce. This can be either a valid
+ * Record subclass created with {@link Roo.data.Record#create}, or an array of objects with which to call
+ * Roo.data.Record.create. See the {@link Roo.data.Record} class for more details.
+ */
+Roo.data.XmlReader = function(meta, recordType){
+ meta = meta || {};
+ Roo.data.XmlReader.superclass.constructor.call(this, meta, recordType||meta.fields);
+};
+Roo.extend(Roo.data.XmlReader, Roo.data.DataReader, {
+ /**
+ * This method is only used by a DataProxy which has retrieved data from a remote server.
+ * @param {Object} response The XHR object which contains the parsed XML document. The response is expected
+ * to contain a method called 'responseXML' that returns an XML document object.
+ * @return {Object} records A data block which is used by an {@link Roo.data.Store} as
+ * a cache of Roo.data.Records.
+ */
+ read : function(response){
+ var doc = response.responseXML;
+ if(!doc) {
+ throw {message: "XmlReader.read: XML Document not available"};
+ }
+ return this.readRecords(doc);
+ },
+
+ /**
+ * Create a data block containing Roo.data.Records from an XML document.
+ * @param {Object} doc A parsed XML document.
+ * @return {Object} records A data block which is used by an {@link Roo.data.Store} as
+ * a cache of Roo.data.Records.
+ */
+ readRecords : function(doc){
+ /**
+ * After any data loads/reads, the raw XML Document is available for further custom processing.
+ * @type XMLDocument
+ */
+ this.xmlData = doc;
+ var root = doc.documentElement || doc;
+ var q = Roo.DomQuery;
+ var recordType = this.recordType, fields = recordType.prototype.fields;
+ var sid = this.meta.id;
+ var totalRecords = 0, success = true;
+ if(this.meta.totalRecords){
+ totalRecords = q.selectNumber(this.meta.totalRecords, root, 0);
+ }
+
+ if(this.meta.success){
+ var sv = q.selectValue(this.meta.success, root, true);
+ success = sv !== false && sv !== 'false';
+ }
+ var records = [];
+ var ns = q.select(this.meta.record, root);
+ for(var i = 0, len = ns.length; i < len; i++) {
+ var n = ns[i];
+ var values = {};
+ var id = sid ? q.selectValue(sid, n) : undefined;
+ for(var j = 0, jlen = fields.length; j < jlen; j++){
+ var f = fields.items[j];
+ var v = q.selectValue(f.mapping || f.name, n, f.defaultValue);
+ v = f.convert(v);
+ values[f.name] = v;
+ }
+ var record = new recordType(values, id);
+ record.node = n;
+ records[records.length] = record;
+ }
+
+ return {
+ success : success,
+ records : records,
+ totalRecords : totalRecords || records.length
+ };
+ }
+});
\ No newline at end of file