1 | /** |
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2 | * Copyright (c) 2008-2010 The Open Source Geospatial Foundation |
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3 | * |
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4 | * Published under the BSD license. |
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5 | * See http://svn.geoext.org/core/trunk/geoext/license.txt for the full text |
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6 | * of the license. |
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7 | */ |
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8 | |
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9 | /** api: (define) |
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10 | * module = GeoExt.data |
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11 | * class = WMSDescribeLayerReader |
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12 | * base_link = `Ext.data.DataReader <http://dev.sencha.com/deploy/dev/docs/?class=Ext.data.DataReader>`_ |
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13 | */ |
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14 | Ext.namespace("GeoExt.data"); |
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15 | |
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16 | /** api: constructor |
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17 | * .. class:: WMSDescribeLayerReader(meta, recordType) |
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18 | * |
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19 | * :param meta: ``Object`` Reader configuration. |
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20 | * :param recordType: ``Array | Ext.data.Record`` An array of field |
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21 | * configuration objects or a record object. Default has |
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22 | * fields for owsType, owsURL, and typeName. |
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23 | * |
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24 | * Data reader class to create an array of |
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25 | * layer description objects from a WMS DescribeLayer |
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26 | * response. |
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27 | */ |
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28 | GeoExt.data.WMSDescribeLayerReader = function(meta, recordType) { |
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29 | meta = meta || {}; |
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30 | if(!meta.format) { |
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31 | meta.format = new OpenLayers.Format.WMSDescribeLayer(); |
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32 | } |
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33 | if(!(typeof recordType === "function")) { |
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34 | recordType = Ext.data.Record.create( |
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35 | recordType || meta.fields || [ |
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36 | {name: "owsType", type: "string"}, |
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37 | {name: "owsURL", type: "string"}, |
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38 | {name: "typeName", type: "string"} |
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39 | ] |
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40 | ); |
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41 | } |
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42 | GeoExt.data.WMSDescribeLayerReader.superclass.constructor.call( |
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43 | this, meta, recordType |
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44 | ); |
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45 | }; |
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46 | |
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47 | Ext.extend(GeoExt.data.WMSDescribeLayerReader, Ext.data.DataReader, { |
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48 | |
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49 | /** private: method[read] |
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50 | * :param request: ``Object`` The XHR object which contains the parsed XML |
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51 | * document. |
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52 | * :return: ``Object`` A data block which is used by an ``Ext.data.Store`` |
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53 | * as a cache of ``Ext.data.Record`` objects. |
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54 | */ |
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55 | read: function(request) { |
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56 | var data = request.responseXML; |
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57 | if(!data || !data.documentElement) { |
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58 | data = request.responseText; |
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59 | } |
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60 | return this.readRecords(data); |
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61 | }, |
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62 | |
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63 | /** private: method[readRecords] |
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64 | * :param data: ``DOMElement | Strint | Object`` A document element or XHR |
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65 | * response string. As an alternative to fetching layer description data |
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66 | * from a remote source, an object representing the layer descriptions can |
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67 | * be provided given that the structure mirrors that returned from the |
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68 | * layer description parser. |
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69 | * :return: ``Object`` A data block which is used by an ``Ext.data.Store`` |
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70 | * as a cache of ``Ext.data.Record`` objects. |
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71 | * |
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72 | * Create a data block containing Ext.data.Records from an XML document. |
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73 | */ |
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74 | readRecords: function(data) { |
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75 | |
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76 | if(typeof data === "string" || data.nodeType) { |
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77 | data = this.meta.format.read(data); |
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78 | } |
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79 | var records = [], description; |
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80 | for(var i=0, len=data.length; i<len; i++){ |
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81 | description = data[i]; |
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82 | if(description) { |
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83 | records.push(new this.recordType(description)); |
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84 | } |
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85 | } |
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86 | |
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87 | return { |
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88 | totalRecords: records.length, |
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89 | success: true, |
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90 | records: records |
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91 | }; |
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92 | |
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93 | } |
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94 | }); |
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