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 | /** |
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10 | * @include GeoExt/data/LayerRecord.js |
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11 | */ |
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12 | |
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13 | /** api: (define) |
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14 | * module = GeoExt.data |
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15 | * class = WFSCapabilitiesReader |
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16 | * base_link = `Ext.data.DataReader <http://dev.sencha.com/deploy/dev/docs/?class=Ext.data.DataReader>`_ |
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17 | */ |
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18 | Ext.namespace("GeoExt.data"); |
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19 | |
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20 | /** api: constructor |
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21 | * .. class:: WFSCapabilitiesReader(meta, recordType) |
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22 | * |
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23 | * :param meta: ``Object`` Reader configuration. |
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24 | * :param recordType: ``Array | Ext.data.Record`` An array of field |
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25 | * configuration objects or a record object. Default is |
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26 | * :class:`GeoExt.data.LayerRecord`. |
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27 | * |
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28 | * Data reader class to create an array of |
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29 | * :class:`GeoExt.data.LayerRecord` objects from a WFS GetCapabilities |
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30 | * response. |
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31 | */ |
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32 | GeoExt.data.WFSCapabilitiesReader = function(meta, recordType) { |
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33 | meta = meta || {}; |
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34 | if(!meta.format) { |
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35 | meta.format = new OpenLayers.Format.WFSCapabilities(); |
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36 | } |
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37 | if(!(typeof recordType === "function")) { |
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38 | recordType = GeoExt.data.LayerRecord.create( |
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39 | recordType || meta.fields || [ |
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40 | {name: "name", type: "string"}, |
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41 | {name: "title", type: "string"}, |
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42 | {name: "namespace", type: "string", mapping: "featureNS"}, |
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43 | {name: "abstract", type: "string"} |
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44 | ] |
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45 | ); |
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46 | } |
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47 | GeoExt.data.WFSCapabilitiesReader.superclass.constructor.call( |
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48 | this, meta, recordType |
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49 | ); |
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50 | }; |
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51 | |
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52 | Ext.extend(GeoExt.data.WFSCapabilitiesReader, Ext.data.DataReader, { |
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53 | |
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54 | /** private: method[read] |
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55 | * :param request: ``Object`` The XHR object which contains the parsed XML |
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56 | * document. |
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57 | * :return: ``Object`` A data block which is used by an ``Ext.data.Store`` |
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58 | * as a cache of ``Ext.data.Record`` objects. |
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59 | */ |
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60 | read: function(request) { |
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61 | var data = request.responseXML; |
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62 | if(!data || !data.documentElement) { |
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63 | data = request.responseText; |
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64 | } |
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65 | return this.readRecords(data); |
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66 | }, |
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67 | |
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68 | /** private: method[readRecords] |
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69 | * :param data: ``DOMElement | String | Object`` A document element or XHR |
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70 | * response string. As an alternative to fetching capabilities data |
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71 | * from a remote source, an object representing the capabilities can |
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72 | * be provided given that the structure mirrors that returned from the |
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73 | * capabilities parser. |
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74 | * :return: ``Object`` A data block which is used by an ``Ext.data.Store`` |
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75 | * as a cache of ``Ext.data.Record`` objects. |
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76 | * |
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77 | * Create a data block containing Ext.data.Records from an XML document. |
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78 | */ |
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79 | readRecords: function(data) { |
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80 | if(typeof data === "string" || data.nodeType) { |
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81 | data = this.meta.format.read(data); |
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82 | } |
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83 | |
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84 | var featureTypes = data.featureTypeList.featureTypes; |
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85 | var fields = this.recordType.prototype.fields; |
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86 | |
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87 | var featureType, values, field, v, parts, layer, values; |
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88 | var layerOptions, protocolOptions; |
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89 | |
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90 | var protocolDefaults = { |
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91 | url: data.capability.request.getfeature.href.post |
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92 | }; |
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93 | |
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94 | var records = []; |
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95 | |
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96 | for(var i=0, lenI=featureTypes.length; i<lenI; i++) { |
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97 | featureType = featureTypes[i]; |
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98 | if(featureType.name) { |
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99 | values = {}; |
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100 | |
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101 | for(var j=0, lenJ=fields.length; j<lenJ; j++) { |
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102 | field = fields.items[j]; |
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103 | v = featureType[field.mapping || field.name] || |
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104 | field.defaultValue; |
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105 | v = field.convert(v); |
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106 | values[field.name] = v; |
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107 | } |
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108 | |
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109 | protocolOptions = { |
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110 | featureType: featureType.name, |
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111 | featureNS: featureType.featureNS |
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112 | }; |
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113 | if(this.meta.protocolOptions) { |
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114 | Ext.apply(protocolOptions, this.meta.protocolOptions, |
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115 | protocolDefaults); |
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116 | } else { |
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117 | Ext.apply(protocolOptions, {}, protocolDefaults); |
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118 | } |
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119 | |
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120 | layerOptions = { |
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121 | protocol: new OpenLayers.Protocol.WFS(protocolOptions), |
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122 | strategies: [new OpenLayers.Strategy.Fixed()] |
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123 | }; |
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124 | if(this.meta.layerOptions) { |
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125 | Ext.apply(layerOptions, this.meta.layerOptions); |
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126 | } |
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127 | |
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128 | values.layer = new OpenLayers.Layer.Vector( |
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129 | featureType.title || featureType.name, |
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130 | layerOptions |
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131 | ); |
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132 | |
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133 | records.push(new this.recordType(values, values.layer.id)); |
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134 | } |
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135 | } |
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136 | return { |
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137 | totalRecords: records.length, |
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138 | success: true, |
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139 | records: records |
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140 | }; |
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141 | } |
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142 | }); |
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