Mercurial > pub > ImplabJs

annotate src/djol/WFSSource.js @ 24:f750c89976d3

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Added trace tools, implab/log/trace!<channel-name>, <channel-name> is optional
author cin
date Thu, 07 Dec 2017 19:19:29 +0300
parents 67a5de7581ad
children
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24
f750c89976d3 Added trace tools, implab/log/trace!<channel-name>, <channel-name> is optional
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1 define([
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2 "ol",
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3 "dojo/request",
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4 "dojo/_base/array",
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5 "implab/safe",
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6 "implab/log/trace!"
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7 ], function (ol,
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8 request,
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9 array,
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10 safe,
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11 trace
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12 ) {
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13 return function (wfs, featurePrefix, featureType, featureNS, queryArgs) {
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14 if (arguments.length == 1) {
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15 featurePrefix = wfs.featurePrefix;
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16 featureType = wfs.featureType;
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17 featureNS = wfs.featureNS;
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18 wfs = wfs.wfsURL;
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19 queryArgs = wfs.queryArgs;
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20 }
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21
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22 safe.argumentNotNull(wfs, "wfsURL");
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23 safe.argumentNotEmptyString(featurePrefix, "featurePrefix");
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24 safe.argumentNotEmptyString(featureNS, "featureNS");
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25 safe.argumentNotEmptyString(featureType, "featureType");
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26
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27 var format = new ol.format.WFS({
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28 featureNS: featureNS,
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29 featureType: featureType
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30 });
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31
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32 var layerName = featurePrefix + ":" + featureType;
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33
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34 function loader(extent, resolution, projection) {
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35 var query = {
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36 service: 'WFS',
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37 version: '1.1.0',
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38 request: 'GetFeature',
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39 typename: layerName,
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40 srsname: projection.getCode()
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41 };
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42 safe.mixin(query, queryArgs);
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43
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44 if (extent && isFinite(extent[0]))
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45 query.bbox = extent.join(',') + "," + projection.getCode();
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46
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47 return request(wfs, {
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48 query: query,
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49 handleAs: 'xml'
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50 }).then(function (data) {
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51 // в загрузчике нельзя вызывать метод source.clear() поскольку
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52 // это приводит к рекурсии
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53 var features = format.readFeatures(data);
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54
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55 var map = {},
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56 del = [],
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57 add = [];
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58
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59 array.forEach(features, function (x) {
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60 // HACK исправляем идентификаторы, чтобы они совпадали с
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61 // реальными
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62
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63 var id = x.get("id");
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64 if (id)
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65 x.setId(id);
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66 else
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67 id = x.getId();
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68
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69 map[id] = x;
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70
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71 // нужно проверить, была ли фича на карте
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72 var prev = source.getFeatureById(id);
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73 if (prev) {
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74 // если да, то обновить ее.
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75 var data = x.getProperties();
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76 prev.setProperties(data);
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77 } else {
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78 // иначе добавить
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79 add.push(x);
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80 }
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81 });
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82
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83 source.forEachFeatureInExtent(extent, function (x) {
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84 if (!(x.getId() in map))
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85 del.push(x);
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86 });
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87
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88 source.addFeatures(add);
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89
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90 array.forEach(del, function (x) {
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91 source.removeFeature(x);
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92 });
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93
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94 //revision = revision + 1;
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95
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96 source.set("revision", ++revision);
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97
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98 });
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99 }
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100
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101 var cls = ol.source.ServerVector || ol.source.Vector;
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102 var revision = 0;
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103 var source = new cls({
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104 loader: loader,
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105 //revision: revision
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106 wrapX: false
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107 // ,
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108 // strategy : options.strategy || ol.loadingstrategy.all,
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109 // projection : options.projection
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110 });
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111 source.set("revision", revision);
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112 source.reload = function (extent, resolution, projection, q) {
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113 if (arguments.length >= 4)
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114 queryArgs = q;
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115 if (!extent)
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116 extent = [-Infinity, -Infinity, Infinity, Infinity];
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117 return loader(extent, resolution, projection);
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118 };
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119
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120 trace.log("{0} -> {1}", layerName, wfs);
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121 return source;
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122 };
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123 });