Mercurial > hg > ng2-query-ismi
annotate app/query.service.ts @ 18:65bb467abcc6
inverse relations are now generated on the fly.
author | Robert Casties <casties@mpiwg-berlin.mpg.de> |
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date | Thu, 21 Jan 2016 20:07:32 +0100 |
parents | f6af2c8347de |
children | d75224bb8147 |
rev | line source |
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1 import {Injectable} from 'angular2/core'; |
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2 import {Http, Headers} from 'angular2/http'; |
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3 |
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4 import 'rxjs/Rx'; // import all RxJS operators |
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5 |
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6 import {QueryMode, QUERY_MODES} from './query-mode'; |
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7 import {QueryState} from './query-state'; |
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8 import {QueryStep} from './query-step'; |
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9 |
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10 @Injectable() |
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11 export class QueryService { |
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12 |
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13 //public neo4jBaseUrl = 'https://ismi-dev.mpiwg-berlin.mpg.de/neo4j-ismi/db/data'; |
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14 public neo4jBaseUrl = 'http://localhost:7474/db/data'; |
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15 public openMindBaseUrl = 'https://ismi-dev.mpiwg-berlin.mpg.de/om4-ismi/'; |
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16 //public openMindBaseUrl = 'http://localhost:18080/ismi-richfaces/'; |
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17 public excludedAttributes = {'type': true}; |
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18 public invRelPrefix = '<- '; |
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19 public state: QueryState; |
8 | 20 public ismiObjectTypes: any; |
2 | 21 |
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22 constructor(private _http: Http) { |
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23 this.state = { |
6 | 24 'steps': [], |
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25 'resultCypherQuery': '', |
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26 'cypherQueryParams': {}, |
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27 'attributesCypherQuery': '', |
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28 'relationsCypherQuery': '', |
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29 'results': [], |
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30 'resultTypes': '', |
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31 'numResults': 0, |
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32 'resultInfo': '' |
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33 }; |
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34 } |
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35 |
8 | 36 setup() { |
37 this.setupIsmiObjectTypes(); | |
38 } | |
39 | |
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40 getState() { |
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41 return this.state; |
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42 } |
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43 |
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44 getQueryModes(): QueryMode[] { |
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45 return QUERY_MODES; |
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46 } |
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47 |
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48 getQueryOptions(queryMode: QueryMode) { |
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49 var options = []; |
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50 if (queryMode == null) return options; |
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51 if (queryMode.id === 'type_is') { |
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52 options = this.ismiObjectTypes; |
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53 } else if (queryMode.id === 'relation_is') { |
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54 options = this.state.nextQueryRelations; |
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55 } else if (queryMode.id === 'att_contains') { |
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56 options = this.state.nextQueryAttributes; |
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57 } else if (queryMode.id === 'att_contains_norm') { |
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58 options = this.state.nextQueryAttributes; |
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59 } else if (queryMode.id === 'att_num_range') { |
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60 options = this.state.nextQueryAttributes; |
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61 } |
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62 console.debug("getQueryOptions returns: ", options); |
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63 return options; |
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64 } |
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65 |
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66 setupIsmiObjectTypes() { |
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67 var query = `MATCH (n) WITH DISTINCT labels(n) AS labels |
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68 UNWIND labels AS label |
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69 RETURN DISTINCT label ORDER BY label`; |
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70 |
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71 var res = this.fetchCypherResults([query]); |
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72 res.subscribe( |
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73 data => { |
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74 console.debug("neo4j data=", data); |
9 | 75 this.ismiObjectTypes = data.results[0].data.map(elem => elem.row[0]).filter(elem => elem[0] != "_"); |
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76 console.debug("ismi types=", this.ismiObjectTypes); |
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77 }, |
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78 err => console.error("neo4j error=", err), |
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79 () => console.debug('neo4j query Complete') |
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80 ); |
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81 } |
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82 |
6 | 83 setQueryStep(index: number, step: QueryStep) { |
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84 this.state.steps[index] = step; |
6 | 85 this.createCypherQuery(); |
86 } | |
87 | |
88 createCypherQuery() { | |
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89 var queryMatch = ''; |
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90 var queryWhere = ''; |
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91 var queryReturn = ''; |
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92 var queryParams = {}; |
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93 var resultQuery = ''; |
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94 var attributesQuery = ''; |
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95 var relationsQuery = ''; |
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96 var returnType = ''; |
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97 var nIdx = 1; |
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98 this.state.steps.forEach((step, stepIdx) => { |
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99 /* |
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100 * step: object type is |
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101 */ |
8 | 102 if (step.mode.id === 'type_is') { |
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103 queryMatch = `MATCH (n${nIdx}:${step.objectType})`; |
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104 queryWhere = ''; |
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105 queryReturn = `RETURN n${nIdx}`; |
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106 returnType = 'node'; |
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107 } |
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108 |
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109 /* |
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110 * step: relation type is |
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111 */ |
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112 if (step.mode.id === 'relation_is') { |
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113 nIdx += 1; |
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114 var rel = step.relationType; |
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115 if (rel.indexOf(this.invRelPrefix) == 0) { |
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116 // inverse relation |
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117 rel = rel.substr(this.invRelPrefix.length); |
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118 queryMatch += `<-[:${rel}]-(n${nIdx})`; |
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119 } else { |
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120 queryMatch += `-[:\`${rel}\`]->(n${nIdx})`; |
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121 } |
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122 queryReturn = `RETURN n${nIdx}`; |
8 | 123 returnType = 'node'; |
124 } | |
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125 |
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126 /* |
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127 * step: attribute contains(_norm) |
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128 */ |
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129 if (step.mode.id === 'att_contains' || step.mode.id === 'att_contains_norm') { |
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130 if (!queryWhere) { |
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131 queryWhere = 'WHERE '; |
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132 } else { |
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133 queryWhere += ' AND '; |
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134 } |
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135 if (step.attribute === 'ismi_id') { |
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136 // ismi_id is integer |
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137 queryWhere += `n${nIdx}.ismi_id = {att_val${stepIdx}}`; |
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138 queryParams[`att_val${stepIdx}`] = parseInt(step.value, 10); |
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139 } else { |
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140 if (step.mode.id === 'att_contains_norm') { |
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141 // match _n_attribute with normValue |
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142 queryWhere += `lower(n${nIdx}._n_${step.attribute}) CONTAINS lower({att_val${stepIdx}})`; |
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143 queryParams[`att_val${stepIdx}`] = step.normValue; |
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144 } else { |
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145 queryWhere += `lower(n${nIdx}.${step.attribute}) CONTAINS lower({att_val${stepIdx}})`; |
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146 queryParams[`att_val${stepIdx}`] = step.value; |
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147 } |
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148 } |
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149 } |
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150 |
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151 /* |
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152 * step: attribute number range |
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153 */ |
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154 if (step.mode.id === 'att_num_range') { |
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155 if (!queryWhere) { |
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156 queryWhere = 'WHERE '; |
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157 } else { |
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158 queryWhere += ' AND '; |
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159 } |
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160 queryWhere += `toint(n${nIdx}.${step.attribute}) >= toint({att_nlo${stepIdx}})` |
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161 + ` AND toint(n${nIdx}.${step.attribute}) <= toint({att_nhi${stepIdx}})`; |
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162 queryParams[`att_nlo${stepIdx}`] = step.numLo; |
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163 queryParams[`att_nhi${stepIdx}`] = step.numHi; |
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164 } |
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165 |
9 | 166 }); |
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167 // compose query |
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168 resultQuery = queryMatch + '\n' + queryWhere + '\n' + queryReturn; |
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169 // compose query for attributes of result |
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170 attributesQuery = queryMatch + ' ' + queryWhere + ` WITH DISTINCT keys(n${nIdx}) AS atts` |
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171 + ` UNWIND atts AS att RETURN DISTINCT att ORDER BY att`; |
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172 // compose query for relations of result |
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173 relationsQuery = queryMatch + '-[r]-() ' + queryWhere + ' RETURN DISTINCT type(r)'; |
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174 this.state.resultCypherQuery = resultQuery; |
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175 this.state.cypherQueryParams = queryParams; |
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176 this.state.attributesCypherQuery = attributesQuery; |
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177 this.state.relationsCypherQuery = relationsQuery; |
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178 this.state.resultTypes = returnType; |
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179 } |
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180 |
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181 updateQuery() { |
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182 this.createCypherQuery(); |
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183 this.state.resultInfo = 'loading...'; |
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184 /* |
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185 * run query for result table |
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186 */ |
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187 var queries = [this.state.resultCypherQuery]; |
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188 var params = [this.state.cypherQueryParams]; |
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189 if (this.state.attributesCypherQuery) { |
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190 queries.push(this.state.attributesCypherQuery); |
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191 params.push(this.state.cypherQueryParams); |
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192 } |
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193 if (this.state.relationsCypherQuery) { |
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194 queries.push(this.state.relationsCypherQuery); |
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195 params.push(this.state.cypherQueryParams); |
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196 } |
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197 var res = this.fetchCypherResults(queries, params); |
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198 res.subscribe( |
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199 data => { |
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200 console.debug("neo4j result data=", data); |
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201 var resIdx = 0; |
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202 /* |
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203 * results for result table |
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204 */ |
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205 this.state.results = data.results[resIdx].data.map(elem => elem.row[0]); |
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206 this.state.numResults = this.state.results.length; |
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207 // count all types |
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208 var resTypes = {}; |
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209 this.state.results.forEach((r) => { |
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210 if (resTypes[r.type] == null) { |
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211 resTypes[r.type] = 1; |
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212 } else { |
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213 resTypes[r.type] += 1; |
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214 } |
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215 }); |
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216 var info = ''; |
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217 for (var t in resTypes) { |
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218 info += t + '(' + resTypes[t] + ') '; |
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219 } |
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220 info = info.substr(0, info.length-1); |
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221 this.state.resultInfo = info; |
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222 // save info also in last step |
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223 this.state.steps[this.state.steps.length-1].resultInfo = info; |
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224 /* |
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225 * results for attribute list |
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226 */ |
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227 if (this.state.attributesCypherQuery) { |
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228 resIdx += 1; |
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229 this.state.nextQueryAttributes = data.results[resIdx].data.map(elem => elem.row[0]) |
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230 .filter(elem => elem[0] != "_" && !this.excludedAttributes[elem]); |
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231 } |
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232 /* |
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233 * results for relations list |
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234 */ |
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235 if (this.state.relationsCypherQuery) { |
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236 resIdx += 1; |
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237 var rels = data.results[resIdx].data.map(elem => elem.row[0]) |
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238 .filter(elem => elem[0] != "_"); |
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239 // add inverse relations |
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240 var invrels = rels.concat(rels.map((r) => this.invRelPrefix + r)); |
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241 this.state.nextQueryRelations = invrels; |
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242 } |
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243 }, |
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244 err => console.error("neo4j result error=", err), |
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245 () => console.debug('neo4j result query Complete') |
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246 ); |
6 | 247 } |
248 | |
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249 fetchCypherResults(queries: string[], params=[{}]) { |
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250 console.debug("fetching cypher queries: ", queries); |
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251 var headers = new Headers(); |
2 | 252 headers.append('Authorization', 'Basic ' + btoa('neo4j' + ':' + 'neo5j')); |
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253 headers.append('Content-Type', 'application/json'); |
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254 headers.append('Accept', 'application/json'); |
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255 // put headers in options |
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256 var opts = {'headers': headers}; |
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257 // unpack queries into statements |
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258 var statements = queries.map((q, i) => { |
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259 return {'statement': q, 'parameters': (params[i])?params[i]:{}}; |
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260 }); |
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261 // create POST data from query |
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262 var data = JSON.stringify({'statements': statements}); |
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263 // make post request asynchronously |
9 | 264 var resp = this._http.post(this.neo4jBaseUrl+'/transaction/commit', data, opts) |
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265 // filter result as JSON |
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266 .map(res => res.json()); |
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267 // return Observable |
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268 return resp; |
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269 } |
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270 |
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271 fetchNormalizedString(text: string) { |
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272 console.debug("fetching normalized string: ", text); |
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273 var headers = new Headers(); |
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274 headers.append('Accept', 'application/json'); |
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275 // put headers in options |
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276 var opts = {'headers': headers}; |
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277 // make get request asynchronously |
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278 var url = this.openMindBaseUrl+'jsonInterface?method=normalize_string&type=arabic_translit&text='; |
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279 url += text; |
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280 var resp = this._http.get(url, opts) |
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281 // filter result as JSON |
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282 .map(res => res.json()); |
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283 // return Observable |
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284 return resp; |
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285 } |
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286 } |