1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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2 | * full list of contributors). Published under the Clear BSD license. |
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3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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4 | * full text of the license. */ |
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5 | |
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6 | /** |
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7 | * @requires OpenLayers/Format/XML.js |
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8 | * @requires OpenLayers/Format/GML.js |
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9 | */ |
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10 | |
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11 | /** |
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12 | * Though required in the full build, if the GML format is excluded, we set |
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13 | * the namespace here. |
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14 | */ |
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15 | if(!OpenLayers.Format.GML) { |
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16 | OpenLayers.Format.GML = {}; |
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17 | } |
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18 | |
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19 | /** |
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20 | * Class: OpenLayers.Format.GML.Base |
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21 | * Superclass for GML parsers. |
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22 | * |
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23 | * Inherits from: |
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24 | * - <OpenLayers.Format.XML> |
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25 | */ |
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26 | OpenLayers.Format.GML.Base = OpenLayers.Class(OpenLayers.Format.XML, { |
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27 | |
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28 | /** |
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29 | * Property: namespaces |
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30 | * {Object} Mapping of namespace aliases to namespace URIs. |
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31 | */ |
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32 | namespaces: { |
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33 | gml: "http://www.opengis.net/gml", |
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34 | xlink: "http://www.w3.org/1999/xlink", |
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35 | xsi: "http://www.w3.org/2001/XMLSchema-instance", |
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36 | wfs: "http://www.opengis.net/wfs" // this is a convenience for reading wfs:FeatureCollection |
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37 | }, |
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38 | |
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39 | /** |
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40 | * Property: defaultPrefix |
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41 | */ |
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42 | defaultPrefix: "gml", |
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43 | |
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44 | /** |
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45 | * Property: schemaLocation |
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46 | * {String} Schema location for a particular minor version. |
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47 | */ |
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48 | schemaLocation: null, |
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49 | |
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50 | /** |
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51 | * APIProperty: featureType |
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52 | * {Array(String) or String} The local (without prefix) feature typeName(s). |
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53 | */ |
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54 | featureType: null, |
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55 | |
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56 | /** |
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57 | * APIProperty: featureNS |
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58 | * {String} The feature namespace. Must be set in the options at |
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59 | * construction. |
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60 | */ |
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61 | featureNS: null, |
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62 | |
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63 | /** |
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64 | * APIProperty: geometry |
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65 | * {String} Name of geometry element. Defaults to "geometry". |
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66 | */ |
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67 | geometryName: "geometry", |
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68 | |
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69 | /** |
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70 | * APIProperty: extractAttributes |
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71 | * {Boolean} Extract attributes from GML. Default is true. |
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72 | */ |
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73 | extractAttributes: true, |
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74 | |
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75 | /** |
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76 | * APIProperty: srsName |
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77 | * {String} URI for spatial reference system. This is optional for |
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78 | * single part geometries and mandatory for collections and multis. |
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79 | * If set, the srsName attribute will be written for all geometries. |
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80 | * Default is null. |
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81 | */ |
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82 | srsName: null, |
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83 | |
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84 | /** |
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85 | * APIProperty: xy |
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86 | * {Boolean} Order of the GML coordinate true:(x,y) or false:(y,x) |
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87 | * Changing is not recommended, a new Format should be instantiated. |
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88 | */ |
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89 | xy: true, |
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90 | |
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91 | /** |
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92 | * Property: geometryTypes |
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93 | * {Object} Maps OpenLayers geometry class names to GML element names. |
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94 | * Use <setGeometryTypes> before accessing this property. |
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95 | */ |
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96 | geometryTypes: null, |
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97 | |
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98 | /** |
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99 | * Property: singleFeatureType |
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100 | * {Boolean} True if there is only 1 featureType, and not an array |
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101 | * of featuretypes. |
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102 | */ |
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103 | singleFeatureType: null, |
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104 | |
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105 | /** |
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106 | * Property: regExes |
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107 | * Compiled regular expressions for manipulating strings. |
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108 | */ |
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109 | regExes: { |
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110 | trimSpace: (/^\s*|\s*$/g), |
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111 | removeSpace: (/\s*/g), |
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112 | splitSpace: (/\s+/), |
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113 | trimComma: (/\s*,\s*/g) |
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114 | }, |
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115 | |
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116 | /** |
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117 | * Constructor: OpenLayers.Format.GML.Base |
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118 | * Instances of this class are not created directly. Use the |
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119 | * <OpenLayers.Format.GML.v2> or <OpenLayers.Format.GML.v3> constructor |
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120 | * instead. |
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121 | * |
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122 | * Parameters: |
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123 | * options - {Object} An optional object whose properties will be set on |
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124 | * this instance. |
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125 | * |
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126 | * Valid options properties: |
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127 | * featureType - {Array(String) or String} Local (without prefix) feature |
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128 | * typeName(s) (required). |
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129 | * featureNS - {String} Feature namespace (required). |
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130 | * geometryName - {String} Geometry element name. |
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131 | */ |
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132 | initialize: function(options) { |
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133 | OpenLayers.Format.XML.prototype.initialize.apply(this, [options]); |
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134 | this.setGeometryTypes(); |
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135 | if(options && options.featureNS) { |
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136 | this.setNamespace("feature", options.featureNS); |
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137 | } |
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138 | this.singleFeatureType = !options || (typeof options.featureType === "string"); |
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139 | }, |
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140 | |
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141 | /** |
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142 | * Method: read |
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143 | * |
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144 | * Parameters: |
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145 | * data - {DOMElement} A gml:featureMember element, a gml:featureMembers |
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146 | * element, or an element containing either of the above at any level. |
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147 | * |
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148 | * Returns: |
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149 | * {Array(<OpenLayers.Feature.Vector>)} An array of features. |
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150 | */ |
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151 | read: function(data) { |
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152 | if(typeof data == "string") { |
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153 | data = OpenLayers.Format.XML.prototype.read.apply(this, [data]); |
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154 | } |
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155 | if(data && data.nodeType == 9) { |
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156 | data = data.documentElement; |
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157 | } |
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158 | var features = []; |
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159 | this.readNode(data, {features: features}); |
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160 | if(features.length == 0) { |
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161 | // look for gml:featureMember elements |
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162 | var elements = this.getElementsByTagNameNS( |
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163 | data, this.namespaces.gml, "featureMember" |
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164 | ); |
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165 | if(elements.length) { |
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166 | for(var i=0, len=elements.length; i<len; ++i) { |
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167 | this.readNode(elements[i], {features: features}); |
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168 | } |
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169 | } else { |
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170 | // look for gml:featureMembers elements (this is v3, but does no harm here) |
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171 | var elements = this.getElementsByTagNameNS( |
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172 | data, this.namespaces.gml, "featureMembers" |
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173 | ); |
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174 | if(elements.length) { |
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175 | // there can be only one |
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176 | this.readNode(elements[0], {features: features}); |
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177 | } |
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178 | } |
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179 | } |
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180 | return features; |
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181 | }, |
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182 | |
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183 | /** |
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184 | * Property: readers |
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185 | * Contains public functions, grouped by namespace prefix, that will |
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186 | * be applied when a namespaced node is found matching the function |
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187 | * name. The function will be applied in the scope of this parser |
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188 | * with two arguments: the node being read and a context object passed |
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189 | * from the parent. |
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190 | */ |
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191 | readers: { |
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192 | "gml": { |
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193 | "featureMember": function(node, obj) { |
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194 | this.readChildNodes(node, obj); |
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195 | }, |
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196 | "featureMembers": function(node, obj) { |
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197 | this.readChildNodes(node, obj); |
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198 | }, |
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199 | "name": function(node, obj) { |
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200 | obj.name = this.getChildValue(node); |
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201 | }, |
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202 | "boundedBy": function(node, obj) { |
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203 | var container = {}; |
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204 | this.readChildNodes(node, container); |
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205 | if(container.components && container.components.length > 0) { |
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206 | obj.bounds = container.components[0]; |
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207 | } |
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208 | }, |
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209 | "Point": function(node, container) { |
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210 | var obj = {points: []}; |
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211 | this.readChildNodes(node, obj); |
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212 | if(!container.components) { |
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213 | container.components = []; |
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214 | } |
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215 | container.components.push(obj.points[0]); |
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216 | }, |
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217 | "coordinates": function(node, obj) { |
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218 | var str = this.getChildValue(node).replace( |
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219 | this.regExes.trimSpace, "" |
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220 | ); |
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221 | str = str.replace(this.regExes.trimComma, ","); |
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222 | var pointList = str.split(this.regExes.splitSpace); |
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223 | var coords; |
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224 | var numPoints = pointList.length; |
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225 | var points = new Array(numPoints); |
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226 | for(var i=0; i<numPoints; ++i) { |
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227 | coords = pointList[i].split(","); |
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228 | if (this.xy) { |
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229 | points[i] = new OpenLayers.Geometry.Point( |
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230 | coords[0], coords[1], coords[2] |
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231 | ); |
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232 | } else { |
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233 | points[i] = new OpenLayers.Geometry.Point( |
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234 | coords[1], coords[0], coords[2] |
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235 | ); |
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236 | } |
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237 | } |
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238 | obj.points = points; |
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239 | }, |
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240 | "coord": function(node, obj) { |
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241 | var coord = {}; |
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242 | this.readChildNodes(node, coord); |
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243 | if(!obj.points) { |
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244 | obj.points = []; |
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245 | } |
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246 | obj.points.push(new OpenLayers.Geometry.Point( |
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247 | coord.x, coord.y, coord.z |
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248 | )); |
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249 | }, |
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250 | "X": function(node, coord) { |
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251 | coord.x = this.getChildValue(node); |
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252 | }, |
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253 | "Y": function(node, coord) { |
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254 | coord.y = this.getChildValue(node); |
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255 | }, |
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256 | "Z": function(node, coord) { |
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257 | coord.z = this.getChildValue(node); |
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258 | }, |
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259 | "MultiPoint": function(node, container) { |
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260 | var obj = {components: []}; |
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261 | this.readChildNodes(node, obj); |
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262 | container.components = [ |
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263 | new OpenLayers.Geometry.MultiPoint(obj.components) |
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264 | ]; |
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265 | }, |
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266 | "pointMember": function(node, obj) { |
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267 | this.readChildNodes(node, obj); |
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268 | }, |
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269 | "LineString": function(node, container) { |
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270 | var obj = {}; |
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271 | this.readChildNodes(node, obj); |
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272 | if(!container.components) { |
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273 | container.components = []; |
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274 | } |
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275 | container.components.push( |
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276 | new OpenLayers.Geometry.LineString(obj.points) |
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277 | ); |
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278 | }, |
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279 | "MultiLineString": function(node, container) { |
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280 | var obj = {components: []}; |
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281 | this.readChildNodes(node, obj); |
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282 | container.components = [ |
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283 | new OpenLayers.Geometry.MultiLineString(obj.components) |
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284 | ]; |
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285 | }, |
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286 | "lineStringMember": function(node, obj) { |
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287 | this.readChildNodes(node, obj); |
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288 | }, |
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289 | "Polygon": function(node, container) { |
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290 | var obj = {outer: null, inner: []}; |
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291 | this.readChildNodes(node, obj); |
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292 | obj.inner.unshift(obj.outer); |
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293 | if(!container.components) { |
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294 | container.components = []; |
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295 | } |
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296 | container.components.push( |
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297 | new OpenLayers.Geometry.Polygon(obj.inner) |
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298 | ); |
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299 | }, |
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300 | "LinearRing": function(node, obj) { |
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301 | var container = {}; |
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302 | this.readChildNodes(node, container); |
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303 | obj.components = [new OpenLayers.Geometry.LinearRing( |
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304 | container.points |
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305 | )]; |
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306 | }, |
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307 | "MultiPolygon": function(node, container) { |
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308 | var obj = {components: []}; |
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309 | this.readChildNodes(node, obj); |
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310 | container.components = [ |
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311 | new OpenLayers.Geometry.MultiPolygon(obj.components) |
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312 | ]; |
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313 | }, |
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314 | "polygonMember": function(node, obj) { |
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315 | this.readChildNodes(node, obj); |
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316 | }, |
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317 | "GeometryCollection": function(node, container) { |
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318 | var obj = {components: []}; |
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319 | this.readChildNodes(node, obj); |
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320 | container.components = [ |
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321 | new OpenLayers.Geometry.Collection(obj.components) |
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322 | ]; |
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323 | }, |
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324 | "geometryMember": function(node, obj) { |
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325 | this.readChildNodes(node, obj); |
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326 | } |
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327 | }, |
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328 | "feature": { |
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329 | "*": function(node, obj) { |
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330 | // The node can either be named like the featureType, or it |
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331 | // can be a child of the feature:featureType. Children can be |
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332 | // geometry or attributes. |
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333 | var name; |
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334 | var local = node.localName || node.nodeName.split(":").pop(); |
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335 | // Since an attribute can have the same name as the feature type |
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336 | // we only want to read the node as a feature if the parent |
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337 | // node can have feature nodes as children. In this case, the |
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338 | // obj.features property is set. |
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339 | if (obj.features) { |
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340 | if (!this.singleFeatureType && |
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341 | (OpenLayers.Util.indexOf(this.featureType, local) !== -1)) { |
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342 | name = "_typeName"; |
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343 | } else if(local === this.featureType) { |
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344 | name = "_typeName"; |
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345 | } |
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346 | } else { |
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347 | // Assume attribute elements have one child node and that the child |
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348 | // is a text node. Otherwise assume it is a geometry node. |
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349 | if(node.childNodes.length == 0 || |
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350 | (node.childNodes.length == 1 && node.firstChild.nodeType == 3)) { |
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351 | if(this.extractAttributes) { |
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352 | name = "_attribute"; |
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353 | } |
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354 | } else { |
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355 | name = "_geometry"; |
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356 | } |
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357 | } |
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358 | if(name) { |
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359 | this.readers.feature[name].apply(this, [node, obj]); |
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360 | } |
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361 | }, |
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362 | "_typeName": function(node, obj) { |
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363 | var container = {components: [], attributes: {}}; |
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364 | this.readChildNodes(node, container); |
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365 | // look for common gml namespaced elements |
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366 | if(container.name) { |
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367 | container.attributes.name = container.name; |
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368 | } |
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369 | var feature = new OpenLayers.Feature.Vector( |
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370 | container.components[0], container.attributes |
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371 | ); |
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372 | if (!this.singleFeatureType) { |
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373 | feature.type = node.nodeName.split(":").pop(); |
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374 | feature.namespace = node.namespaceURI; |
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375 | } |
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376 | var fid = node.getAttribute("fid") || |
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377 | this.getAttributeNS(node, this.namespaces["gml"], "id"); |
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378 | if(fid) { |
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379 | feature.fid = fid; |
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380 | } |
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381 | if(this.internalProjection && this.externalProjection && |
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382 | feature.geometry) { |
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383 | feature.geometry.transform( |
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384 | this.externalProjection, this.internalProjection |
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385 | ); |
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386 | } |
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387 | if(container.bounds) { |
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388 | feature.bounds = container.bounds; |
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389 | } |
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390 | obj.features.push(feature); |
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391 | }, |
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392 | "_geometry": function(node, obj) { |
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393 | this.readChildNodes(node, obj); |
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394 | }, |
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395 | "_attribute": function(node, obj) { |
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396 | var local = node.localName || node.nodeName.split(":").pop(); |
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397 | var value = this.getChildValue(node); |
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398 | obj.attributes[local] = value; |
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399 | } |
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400 | }, |
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401 | "wfs": { |
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402 | "FeatureCollection": function(node, obj) { |
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403 | this.readChildNodes(node, obj); |
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404 | } |
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405 | } |
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406 | }, |
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407 | |
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408 | /** |
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409 | * Method: write |
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410 | * |
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411 | * Parameters: |
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412 | * features - {Array(<OpenLayers.Feature.Vector>) | OpenLayers.Feature.Vector} |
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413 | * An array of features or a single feature. |
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414 | * |
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415 | * Returns: |
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416 | * {String} Given an array of features, a doc with a gml:featureMembers |
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417 | * element will be returned. Given a single feature, a doc with a |
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418 | * gml:featureMember element will be returned. |
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419 | */ |
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420 | write: function(features) { |
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421 | var name; |
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422 | if(features instanceof Array) { |
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423 | name = "featureMembers"; |
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424 | } else { |
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425 | name = "featureMember"; |
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426 | } |
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427 | var root = this.writeNode("gml:" + name, features); |
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428 | this.setAttributeNS( |
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429 | root, this.namespaces["xsi"], |
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430 | "xsi:schemaLocation", this.schemaLocation |
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431 | ); |
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432 | |
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433 | return OpenLayers.Format.XML.prototype.write.apply(this, [root]); |
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434 | }, |
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435 | |
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436 | /** |
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437 | * Property: writers |
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438 | * As a compliment to the readers property, this structure contains public |
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439 | * writing functions grouped by namespace alias and named like the |
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440 | * node names they produce. |
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441 | */ |
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442 | writers: { |
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443 | "gml": { |
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444 | "featureMember": function(feature) { |
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445 | var node = this.createElementNSPlus("gml:featureMember"); |
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446 | this.writeNode("feature:_typeName", feature, node); |
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447 | return node; |
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448 | }, |
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449 | "MultiPoint": function(geometry) { |
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450 | var node = this.createElementNSPlus("gml:MultiPoint"); |
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451 | for(var i=0; i<geometry.components.length; ++i) { |
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452 | this.writeNode("pointMember", geometry.components[i], node); |
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453 | } |
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454 | return node; |
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455 | }, |
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456 | "pointMember": function(geometry) { |
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457 | var node = this.createElementNSPlus("gml:pointMember"); |
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458 | this.writeNode("Point", geometry, node); |
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459 | return node; |
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460 | }, |
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461 | "MultiLineString": function(geometry) { |
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462 | var node = this.createElementNSPlus("gml:MultiLineString"); |
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463 | for(var i=0; i<geometry.components.length; ++i) { |
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464 | this.writeNode("lineStringMember", geometry.components[i], node); |
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465 | } |
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466 | return node; |
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467 | }, |
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468 | "lineStringMember": function(geometry) { |
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469 | var node = this.createElementNSPlus("gml:lineStringMember"); |
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470 | this.writeNode("LineString", geometry, node); |
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471 | return node; |
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472 | }, |
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473 | "MultiPolygon": function(geometry) { |
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474 | var node = this.createElementNSPlus("gml:MultiPolygon"); |
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475 | for(var i=0; i<geometry.components.length; ++i) { |
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476 | this.writeNode( |
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477 | "polygonMember", geometry.components[i], node |
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478 | ); |
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479 | } |
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480 | return node; |
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481 | }, |
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482 | "polygonMember": function(geometry) { |
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483 | var node = this.createElementNSPlus("gml:polygonMember"); |
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484 | this.writeNode("Polygon", geometry, node); |
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485 | return node; |
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486 | }, |
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487 | "GeometryCollection": function(geometry) { |
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488 | var node = this.createElementNSPlus("gml:GeometryCollection"); |
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489 | for(var i=0, len=geometry.components.length; i<len; ++i) { |
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490 | this.writeNode("geometryMember", geometry.components[i], node); |
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491 | } |
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492 | return node; |
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493 | }, |
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494 | "geometryMember": function(geometry) { |
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495 | var node = this.createElementNSPlus("gml:geometryMember"); |
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496 | var child = this.writeNode("feature:_geometry", geometry); |
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497 | node.appendChild(child.firstChild); |
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498 | return node; |
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499 | } |
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500 | }, |
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501 | "feature": { |
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502 | "_typeName": function(feature) { |
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503 | var node = this.createElementNSPlus("feature:" + this.featureType, { |
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504 | attributes: {fid: feature.fid} |
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505 | }); |
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506 | if(feature.geometry) { |
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507 | this.writeNode("feature:_geometry", feature.geometry, node); |
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508 | } |
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509 | for(var name in feature.attributes) { |
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510 | var value = feature.attributes[name]; |
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511 | if(value != null) { |
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512 | this.writeNode( |
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513 | "feature:_attribute", |
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514 | {name: name, value: value}, node |
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515 | ); |
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516 | } |
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517 | } |
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518 | return node; |
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519 | }, |
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520 | "_geometry": function(geometry) { |
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521 | if(this.externalProjection && this.internalProjection) { |
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522 | geometry = geometry.clone().transform( |
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523 | this.internalProjection, this.externalProjection |
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524 | ); |
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525 | } |
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526 | var node = this.createElementNSPlus( |
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527 | "feature:" + this.geometryName |
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528 | ); |
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529 | var type = this.geometryTypes[geometry.CLASS_NAME]; |
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530 | var child = this.writeNode("gml:" + type, geometry, node); |
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531 | if(this.srsName) { |
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532 | child.setAttribute("srsName", this.srsName); |
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533 | } |
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534 | return node; |
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535 | }, |
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536 | "_attribute": function(obj) { |
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537 | return this.createElementNSPlus("feature:" + obj.name, { |
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538 | value: obj.value |
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539 | }); |
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540 | } |
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541 | }, |
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542 | "wfs": { |
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543 | "FeatureCollection": function(features) { |
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544 | /** |
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545 | * This is only here because GML2 only describes abstract |
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546 | * feature collections. Typically, you would not be using |
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547 | * the GML format to write wfs elements. This just provides |
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548 | * some way to write out lists of features. GML3 defines the |
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549 | * featureMembers element, so that is used by default instead. |
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550 | */ |
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551 | var node = this.createElementNSPlus("wfs:FeatureCollection"); |
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552 | for(var i=0, len=features.length; i<len; ++i) { |
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553 | this.writeNode("gml:featureMember", features[i], node); |
---|
554 | } |
---|
555 | return node; |
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556 | } |
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557 | } |
---|
558 | }, |
---|
559 | |
---|
560 | /** |
---|
561 | * Function: setGeometryTypes |
---|
562 | * Sets the <geometryTypes> mapping. |
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563 | */ |
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564 | setGeometryTypes: function() { |
---|
565 | this.geometryTypes = { |
---|
566 | "OpenLayers.Geometry.Point": "Point", |
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567 | "OpenLayers.Geometry.MultiPoint": "MultiPoint", |
---|
568 | "OpenLayers.Geometry.LineString": "LineString", |
---|
569 | "OpenLayers.Geometry.MultiLineString": "MultiLineString", |
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570 | "OpenLayers.Geometry.Polygon": "Polygon", |
---|
571 | "OpenLayers.Geometry.MultiPolygon": "MultiPolygon", |
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572 | "OpenLayers.Geometry.Collection": "GeometryCollection" |
---|
573 | }; |
---|
574 | }, |
---|
575 | |
---|
576 | CLASS_NAME: "OpenLayers.Format.GML.Base" |
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577 | |
---|
578 | }); |
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