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