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8
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1 define(
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2 [
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3 "dojo/_base/declare",
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4 "dojo/_base/array",
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5 "implab/safe",
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6 "implab/Uuid",
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7 "ol",
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8 "ol3/listen",
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9 "./VectorStoreQuery",
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10 "dojo/store/util/QueryResults"
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11 ],
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12 function (declare, array, safe, UUID, ol, listen, VectorStoreQuery, QueryResults) {
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13 function createPaginator(opts) {
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14 return (opts.count || opts.start) &&
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15 function (results) {
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16 var total = results.length;
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17 results = results.slice(opts.start || 0, (opts.start || 0) +
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18 (opts.count || Infinity));
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19 results.total = total;
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20
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21 return results;
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22 };
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23 }
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24
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25 /**
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26 * Обертка вокруг векторного источника данных ol.source.Vector,
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27 * реализует dojo/store а также notify, что делает возможным наблюдение
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28 * за хранилищем при помощи dojo/store/Observable.
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29 *
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30 * @disposable
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31 */
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32 return declare(
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33 null, {
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34 _source: null, // ol3.source.Vector
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35
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22
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36 _projection: null,
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37
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8
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38 _subscriptions: null,
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39
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40 constructor: function (opts) {
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41 safe.argumentNotNull(opts, "opts");
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42 safe.argumentOfType(
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43 opts.source,
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44 ol.source.Vector,
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45 "opts.source");
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46
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47 var me = this;
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48
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49 me._source = opts.source;
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22
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50 if (opts.projection)
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51 me._projection = ol.proj.get(opts.projection);
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8
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52 },
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53
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54 getSource: function () {
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55 return this._source;
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56 },
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57
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22
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58 getProjection: function() {
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59 return this._projection;
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60 },
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61
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8
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62 get: function (id) {
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63 return this._source.getFeatureById(id);
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64 },
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65
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66 /**
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67 * @param{Object|Function} q предикат для выбора объекта
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68 * @param{Object} opts параметры выполнения (start,count,sort)
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69 * @return{Function} filter(data) filter.matches
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70 * filter.matches.predicate
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71 * filter.matches.extent filter.sort
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72 * filter.sort.compare
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73 */
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74 queryEngine: function (q, opts) {
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75 opts = opts || {};
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76
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77 // строим функцию для фильтрации
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78 var filter;
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79 if (q instanceof Function) {
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80 // если передали уже готовую функцию, испольуем ее
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81 filter = new VectorStoreQuery(q, q.extent);
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82 } else {
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83 // если передали объект
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84 var extent;
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85 // вытаскиваем из него extent
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86 if (q && 'extent' in q) {
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87 extent = q.extent;
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88 delete q.extent;
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89 }
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90
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91 // строим новую функцию фильтрации
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92 filter = new VectorStoreQuery(q, extent);
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93 }
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94
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95 // строим функцию сортировки
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96 var sort = opts.sort && this.sortEngine(opts.sort);
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97
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98 var paginate = createPaginator(opts);
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99
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100 // строим функцию выполнения запроса
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101 var execute = function (data) {
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102 var results = array.filter(data, filter);
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103
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104 if (sort)
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105 sort(results);
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106
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107 if (paginate)
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108 results = paginate(results);
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109 return results;
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110 };
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111
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112 execute.matches = filter;
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113 execute.sort = sort;
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114 execute.paginate = paginate;
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115 return execute;
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116 },
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117
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118 sortEngine: function (options) {
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119 var cmp = function (a, b) {
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120 for (var sort, i = 0;
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121 (sort = options[i]); i++) {
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122 var aValue = a.get(sort.attribute);
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123 var bValue = b.get(sort.attribute);
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124 if (aValue != bValue) {
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125 return Boolean(sort.descending) == aValue > bValue ? -1 : 1;
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126 }
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127 }
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128 return 0;
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129 };
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130
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131 var execute = function (data) {
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132 return data.sort(cmp);
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133 };
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134
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135 execute.compare = cmp;
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136 return execute;
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137 },
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138
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139 /**
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140 * Запрашивает объекты со слоя
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141 *
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142 * @param{object|VectorStoreQuery|Function} query
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143 *
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144 * <pre>
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145 * {
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146 * extent : ol3.Extent,
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147 * }
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148 * </pre>
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149 */
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150 query: function (q, options) {
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151 var me = this;
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152 var filter = this.queryEngine(q, options);
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153
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154 if (this.notify && !this.hasOwnProperty("_subscriptions")) {
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155 me._subscriptions = [];
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156
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157 var sc = function (evt, handler) {
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158 me._subscriptions.push(listen(me._source, evt, safe.delegate(me, handler)));
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159 }
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160
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161 sc("addfeature", "_onAdd");
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162 sc("changefeature", "_onUpdate");
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163 sc("removefeature", "_onRemove");
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164 }
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165
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166 var predicate, data, extent = filter.matches &&
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167 filter.matches.extent;
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168 // если это запрос с указанием области
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169 if (extent) {
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170 predicate = filter.matches.predicate;
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171
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172 data = this._source.getFeaturesInExtent(extent);
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173
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174 if (predicate)
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175 data = array.filter(data, predicate);
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176
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177 if (filter.sort)
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178 filter.sort(data);
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179
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180 if (filter.paginate)
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181 data = filter.paginate(data);
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182 } else {
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183 // любой другой запрос
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184 data = filter(this._source.getFeatures());
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185 }
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186
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187 return new QueryResults(data);
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188 },
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189
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190 put: function (obj, options) {
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191 safe.argumentOfType(obj, ol.Feature, "obj");
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192 if (!options)
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193 options = {};
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194
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195 if (options.id)
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196 obj.setId(options.id);
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197
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198 var id = obj.getId() || new UUID();
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199
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200 var prev = this.get(id);
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201
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202 if ('overwrite' in options) {
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203 // overwrite=true указан, но перезаписывать нечего
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204 if (!prev && options.overwrite)
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205 throw new Error("The specified feature with id '" +
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206 id + "' doesn't exist in the store");
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207
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208 // overwrite=false указан, но объект уже существует
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209 if (prev && !options.overwrite)
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210 throw new Error("The specified feature with id '" +
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211 id + "' already exists in the store");
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212 }
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213
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214 // ok
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215 if (prev) {
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216 var data = obj.getProperties();
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217 prev.setProperties(data);
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218 } else {
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219 this._source.addFeature(obj);
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220 }
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221
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222 return id;
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223 },
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224
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225 add: function (obj, options) {
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226 safe.argumentOfType(obj, ol.Feature, "obj");
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227
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228 if (!options)
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229 options = {};
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230
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231 if (options.id)
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232 obj.setId(options.id);
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233
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234 var id = obj.getId() || new UUID();
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235
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236 var prev = this.get(id);
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237
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238 if (prev)
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239 throw new Error("The specified feature with id '" + id +
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240 "' already exists in the store");
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241
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242 this._source.addFeature(obj);
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243 },
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244
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245 remove: function (id) {
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246 var me = this;
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247
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248 var ft = me.get(id);
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249 if (ft)
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250 me._source.removeFeature(ft);
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251 },
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252
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253 getIdentity: function (obj) {
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254 if (safe.isNull(obj))
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255 return undefined;
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256 if (!(obj instanceof ol.Feature))
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257 throw new Error("A feature is expected");
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258
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259 return obj.getId();
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260 },
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261
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262 _onAdd: function (ev) {
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263 this.notify(ev.feature);
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264 },
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265
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266 _onRemove: function (ev) {
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267 var id = ev.feature.getId();
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268 if (!safe.isNull(id))
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269 this.notify(undefined, id);
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270 },
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271
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272 _onUpdate: function (ev) {
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273 var id = ev.feature.getId();
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274 if (!safe.isNull(id))
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275 this.notify(ev.feature, id);
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276 },
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277
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278 dispose: function () {
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279 var me = this;
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280 if (me._subscriptions)
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281 me._subscriptions.forEach(function (sc) {
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282 sc.remove();
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283 });
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284
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285 me._source = null;
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286 me._subscriptions = null;
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287 }
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288 });
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289 }); |
