[76] | 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 |
---|
| 515 | ); |
---|
| 516 | } |
---|
| 517 | } |
---|
| 518 | return node; |
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| 519 | }, |
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| 520 | "_geometry": function(geometry) { |
---|
| 521 | if(this.externalProjection && this.internalProjection) { |
---|
| 522 | geometry = geometry.clone().transform( |
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| 523 | this.internalProjection, this.externalProjection |
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| 524 | ); |
---|
| 525 | } |
---|
| 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) { |
---|
| 532 | child.setAttribute("srsName", this.srsName); |
---|
| 533 | } |
---|
| 534 | return node; |
---|
| 535 | }, |
---|
| 536 | "_attribute": function(obj) { |
---|
| 537 | return this.createElementNSPlus("feature:" + obj.name, { |
---|
| 538 | value: obj.value |
---|
| 539 | }); |
---|
| 540 | } |
---|
| 541 | }, |
---|
| 542 | "wfs": { |
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| 543 | "FeatureCollection": function(features) { |
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| 544 | /** |
---|
| 545 | * This is only here because GML2 only describes abstract |
---|
| 546 | * feature collections. Typically, you would not be using |
---|
| 547 | * the GML format to write wfs elements. This just provides |
---|
| 548 | * some way to write out lists of features. GML3 defines the |
---|
| 549 | * featureMembers element, so that is used by default instead. |
---|
| 550 | */ |
---|
| 551 | var node = this.createElementNSPlus("wfs:FeatureCollection"); |
---|
| 552 | for(var i=0, len=features.length; i<len; ++i) { |
---|
| 553 | this.writeNode("gml:featureMember", features[i], node); |
---|
| 554 | } |
---|
| 555 | return node; |
---|
| 556 | } |
---|
| 557 | } |
---|
| 558 | }, |
---|
| 559 | |
---|
| 560 | /** |
---|
| 561 | * Function: setGeometryTypes |
---|
| 562 | * Sets the <geometryTypes> mapping. |
---|
| 563 | */ |
---|
| 564 | setGeometryTypes: function() { |
---|
| 565 | this.geometryTypes = { |
---|
| 566 | "OpenLayers.Geometry.Point": "Point", |
---|
| 567 | "OpenLayers.Geometry.MultiPoint": "MultiPoint", |
---|
| 568 | "OpenLayers.Geometry.LineString": "LineString", |
---|
| 569 | "OpenLayers.Geometry.MultiLineString": "MultiLineString", |
---|
| 570 | "OpenLayers.Geometry.Polygon": "Polygon", |
---|
| 571 | "OpenLayers.Geometry.MultiPolygon": "MultiPolygon", |
---|
| 572 | "OpenLayers.Geometry.Collection": "GeometryCollection" |
---|
| 573 | }; |
---|
| 574 | }, |
---|
| 575 | |
---|
| 576 | CLASS_NAME: "OpenLayers.Format.GML.Base" |
---|
| 577 | |
---|
| 578 | }); |
---|