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8
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1 define([ "ol", "dojo/request", "dojo/_base/array", "implab/safe"],
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2
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3 function(ol, request, array, safe) {
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4 return function(wfs, featurePrefix, featureType, featureNS, queryArgs) {
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5 if (arguments.length == 1) {
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6 featurePrefix = wfs.featurePrefix;
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7 featureType = wfs.featureType;
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8 featureNS = wfs.featureNS;
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9 wfs = wfs.wfsURL;
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10 queryArgs = wfs.queryArgs;
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11 }
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12
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13 safe.argumentNotNull(wfs, "wfsURL");
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14 safe.argumentNotEmpty(featurePrefix, "featurePrefix");
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15 safe.argumentNotEmpty(featureNS, "featureNS");
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16 safe.argumentNotEmpty(featureType, "featureType");
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17
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18 var format = new ol.format.WFS({
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19 featureNS : featureNS,
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20 featureType : featureType
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21 });
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22
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23 var layerName = featurePrefix + ":" + featureType;
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24
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25 function loader(extent, resolution, projection) {
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26 var query = {
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27 service : 'WFS',
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28 version : '1.1.0',
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29 request : 'GetFeature',
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30 typename : layerName,
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31 srsname : projection.getCode()
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32 };
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33 safe.mixin(query, queryArgs);
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34
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35 if (extent && isFinite(extent[0]))
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36 query.bbox = extent.join(',') + "," + projection.getCode();
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37
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38 return request(wfs, {
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39 query : query,
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40 handleAs : 'xml'
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41 }).then(function(data) {
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42 // в загрузчике нельзя вызывать метод source.clear() поскольку
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43 // это приводит к рекурсии
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44 var features = format.readFeatures(data);
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45
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46 var map = {}, del = [], add = [];
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47
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48 array.forEach(features, function(x) {
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49 // HACK исправляем идентификаторы, чтобы они совпадали с
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50 // реальными
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51
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52 var id = x.get("id");
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53 if (id)
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54 x.setId(id);
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55 else
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56 id = x.getId();
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57
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58 map[id] = x;
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59
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60 // нужно проверить, была ли фича на карте
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61 var prev = source.getFeatureById(id);
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62 if (prev) {
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63 // если да, то обновить ее.
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64 var data = x.getProperties();
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65 prev.setProperties(data);
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66 } else {
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67 // иначе добавить
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68 add.push(x);
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69 }
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70 });
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71
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72 source.forEachFeatureInExtent(extent, function(x) {
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73 if (!(x.getId() in map))
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74 del.push(x);
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75 });
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76
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77 source.addFeatures(add);
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78
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79 array.forEach(del, function(x) {
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80 source.removeFeature(x);
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81 });
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82
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83 //revision = revision + 1;
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84
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85 source.set("revision", ++revision);
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86
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87 });
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88 }
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89
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90 var cls = ol.source.ServerVector || ol.source.Vector;
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91 var revision = 0;
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92 var source = new cls({
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93 loader : loader,
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94 //revision: revision
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95 wrapX : false
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96 // ,
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97 // strategy : options.strategy || ol.loadingstrategy.all,
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98 // projection : options.projection
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99 });
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100 source.set("revision", revision);
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101 source.reload = function(extent,resolution, projection, q) {
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102 if (arguments.length >= 4)
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103 queryArgs = q;
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104 if (!extent)
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105 extent = [-Infinity, -Infinity, Infinity, Infinity];
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106 return loader(extent,resolution,projection);
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107 };
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108
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109 console.log(wfs, layerName);
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110 return source;
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111 };
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112 }); |
