Mercurial > hg > ng2-query-ismi

annotate app/query.service.ts @ 31:4926885f8a99

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selectable result columns. nicer cypher query output.
author casties
date Mon, 01 Feb 2016 20:10:55 +0100
parents 193271b6b9d2
children 4c046f3244ec
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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 //import 'rxjs/add/operator/map';
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7 import {QueryMode, QUERY_MODES} from './query-mode';
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8 import {QueryState} from './query-state';
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9 import {QueryStep} from './query-step';
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10 import {getResultType} from './result-type';
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11 import {ISMI_RESULT_TYPES} from './ismi-result-types';
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12
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13 @Injectable()
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14 export class QueryService {
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15
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16 //public neo4jBaseUrl = 'https://ismi-dev.mpiwg-berlin.mpg.de/neo4j-ismi/db/data';
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17 public neo4jBaseUrl = 'http://localhost:7474/db/data';
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18 public neo4jAuthentication = {'user': 'neo4j', 'password': 'neo5j'};
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19 public excludedAttributes = {'type': true};
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20 public invRelPrefix = '<- ';
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21 public state: QueryState;
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22 public objectTypes: string[];
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23
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24 constructor(private _http: Http) {
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25 // init query state
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26 this.state = new QueryState();
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27 }
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28
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29 setup() {
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30 this.setupObjectTypes();
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31 }
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32
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33 getState() {
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34 return this.state;
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35 }
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36
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37 getQueryModes(): QueryMode[] {
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38 return QUERY_MODES;
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39 }
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41 /**
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42 * return the first set of options for the given query mode.
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43 */
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44 getQueryOptions(queryMode: QueryMode) {
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45 var options = [];
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46 if (queryMode == null) return options;
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47 if (queryMode.id === 'type_is') {
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48 options = this.objectTypes;
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49 } else if (queryMode.id === 'relation_is') {
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50 options = this.state.resultRelations;
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51 } else if (queryMode.id === 'att_contains') {
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52 options = this.filterAttributes(this.state.resultAttributes);
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53 } else if (queryMode.id === 'att_contains_norm') {
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54 options = this.filterAttributes(this.state.resultAttributes, true);
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55 } else if (queryMode.id === 'att_num_range') {
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56 options = this.filterAttributes(this.state.resultAttributes);
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57 }
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58 console.debug("getQueryOptions returns: ", options);
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59 return options;
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60 }
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61
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62 /**
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63 * fetch all object types from Neo4j and store in this.objectTypes.
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64 */
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65 setupObjectTypes() {
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66 var query = `MATCH (n) WITH DISTINCT labels(n) AS labels
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67 UNWIND labels AS label
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68 RETURN DISTINCT label ORDER BY label`;
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69
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70 var res = this.fetchCypherResults([query]);
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71 res.subscribe(
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72 data => {
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73 console.debug("neo4j data=", data);
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74 this.objectTypes = data.results[0].data.map(elem => elem.row[0]).filter(elem => elem[0] != "_");
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75 console.debug("object types=", this.objectTypes);
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76 },
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77 err => console.error("neo4j error=", err),
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78 () => console.debug('neo4j query Complete')
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79 );
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80 }
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81
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82 /**
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83 * Set the query step at index.
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84 */
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85 setQueryStep(index: number, step: QueryStep) {
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86 this.state.steps[index] = step;
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87 }
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88
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89 /**
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90 * Create the cypher queries for the current query state.
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91 *
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92 * Updates the queries for results, attributes and relations.
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93 */
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94 createCypherQuery() {
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95 var queryMatch = '';
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96 var queryWhere = '';
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97 var queryReturn = '';
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98 var queryParams = {};
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99 var resultQuery = '';
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100 var attributesQuery = '';
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101 var relationsQuery = '';
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102 var returnType = '';
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103 var nIdx = 1;
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104 this.state.steps.forEach((step, stepIdx) => {
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105 var mode = step.mode.id;
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106 var params = step.params;
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107
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108 /*
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109 * step: object type is
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110 */
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111 if (mode === 'type_is') {
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112 queryMatch = `MATCH (n${nIdx}:${params.objectType})`;
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113 queryWhere = '';
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114 queryReturn = `RETURN n${nIdx}`;
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115 returnType = 'node';
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116 }
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117
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118 /*
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119 * step: relation type is
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120 */
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121 if (mode === 'relation_is') {
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122 nIdx += 1;
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123 var rel = params.relationType;
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124 if (rel.indexOf(this.invRelPrefix) == 0) {
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125 // inverse relation
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126 rel = rel.substr(this.invRelPrefix.length);
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127 queryMatch += `<-[:${rel}]-(n${nIdx})`;
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128 } else {
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129 queryMatch += `-[:${rel}]->(n${nIdx})`;
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130 }
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131 queryReturn = `RETURN n${nIdx}`;
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132 returnType = 'node';
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133 }
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134
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135 /*
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136 * step: attribute contains(_norm)
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137 */
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138 if (mode === 'att_contains' || mode === 'att_contains_norm') {
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139 if (!queryWhere) {
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140 queryWhere = 'WHERE ';
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141 } else {
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142 queryWhere += ' AND ';
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143 }
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144 if (params.attribute === 'ismi_id') {
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145 // ismi_id is integer
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146 queryWhere += `n${nIdx}.ismi_id = {att_val${stepIdx}}`;
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147 queryParams[`att_val${stepIdx}`] = parseInt(params.value, 10);
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148 } else {
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149 if (mode === 'att_contains_norm') {
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150 // match _n_attribute with normValue
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151 queryWhere += `lower(n${nIdx}._n_${params.attribute}) CONTAINS lower({att_val${stepIdx}})`;
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152 queryParams[`att_val${stepIdx}`] = params.normValue;
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153 } else {
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154 queryWhere += `lower(n${nIdx}.${params.attribute}) CONTAINS lower({att_val${stepIdx}})`;
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155 queryParams[`att_val${stepIdx}`] = params.value;
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156 }
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157 }
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158 }
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159
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160 /*
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161 * step: attribute number range
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162 */
20
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163 if (mode === 'att_num_range') {
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164 if (!queryWhere) {
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165 queryWhere = 'WHERE ';
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166 } else {
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167 queryWhere += ' AND ';
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168 }
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169 queryWhere += `toint(n${nIdx}.${params.attribute}) >= toint({att_nlo${stepIdx}})`
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170 + ` AND toint(n${nIdx}.${params.attribute}) <= toint({att_nhi${stepIdx}})`;
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171 queryParams[`att_nlo${stepIdx}`] = params.numLo;
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172 queryParams[`att_nhi${stepIdx}`] = params.numHi;
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173 }
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174
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175 });
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176 // compose query
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177 resultQuery = queryMatch + '\n' + queryWhere + '\n' + queryReturn;
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178 // compose query for attributes of result
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179 attributesQuery = queryMatch + ' ' + queryWhere + ` WITH DISTINCT keys(n${nIdx}) AS atts`
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180 + ` UNWIND atts AS att RETURN DISTINCT att ORDER BY att`;
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181 // compose query for relations of result
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182 relationsQuery = queryMatch + '-[r]-() ' + queryWhere + ' RETURN DISTINCT type(r)';
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183 this.state.resultCypherQuery = resultQuery;
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184 this.state.cypherQueryParams = queryParams;
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185 this.state.attributesCypherQuery = attributesQuery;
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186 this.state.relationsCypherQuery = relationsQuery;
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187 this.state.resultTypes = returnType;
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188 }
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189
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190 /**
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191 * Create and run the cypher queries for the current query state.
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192 *
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193 * Updates the results and nextQuery attributes and relations.
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194 */
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195 updateQuery() {
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196 this.createCypherQuery();
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197 this.state.resultInfo = 'loading...';
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198 /*
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199 * run query for result table
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200 */
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201 var queries = [this.state.resultCypherQuery];
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202 var params = [this.state.cypherQueryParams];
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203 if (this.state.attributesCypherQuery) {
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204 queries.push(this.state.attributesCypherQuery);
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205 params.push(this.state.cypherQueryParams);
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206 }
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207 if (this.state.relationsCypherQuery) {
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208 queries.push(this.state.relationsCypherQuery);
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209 params.push(this.state.cypherQueryParams);
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210 }
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211 var res = this.fetchCypherResults(queries, params);
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212 res.subscribe(
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213 data => {
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214 console.debug("neo4j result data=", data);
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215 var resIdx = 0;
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216 /*
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217 * results for result table
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218 */
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219 this.state.results = data.results[resIdx].data.map(elem => elem.row[0]);
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220 this.state.numResults = this.state.results.length;
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221 // count all types
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222 var resTypes = {};
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223 this.state.results.forEach((r) => {
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224 if (resTypes[r.type] == null) {
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225 resTypes[r.type] = 1;
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226 } else {
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227 resTypes[r.type] += 1;
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228 }
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229 });
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230 var info = '';
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231 for (var t in resTypes) {
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232 info += t + '(' + resTypes[t] + ') ';
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233 }
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234 info = info.substr(0, info.length-1);
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235 this.state.resultInfo = info;
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236 // save info also in last step
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237 this.state.steps[this.state.steps.length-1].resultInfo = info;
17
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diff changeset
238 /*
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239 * results for attribute list
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diff changeset
240 */
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241 if (this.state.attributesCypherQuery) {
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242 resIdx += 1;
30
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243 let atts = data.results[resIdx].data.map(elem => elem.row[0]);
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244 this.state.resultAttributes = atts;
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245 // the following assumes only one type in the result
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246 for (let t in resTypes) {
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247 this.state.resultType = getResultType(t, ISMI_RESULT_TYPES);
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248 break;
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249 }
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diff changeset
250 this.state.resultColumns = this.state.resultType.getColumns(atts);
17
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diff changeset
251 }
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diff changeset
252 /*
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diff changeset
253 * results for relations list
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diff changeset
254 */
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diff changeset
255 if (this.state.relationsCypherQuery) {
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diff changeset
256 resIdx += 1;
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diff changeset
257 var rels = data.results[resIdx].data.map(elem => elem.row[0])
17
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diff changeset
258 .filter(elem => elem[0] != "_");
18
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diff changeset
259 // add inverse relations
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diff changeset
260 var invrels = rels.concat(rels.map((r) => this.invRelPrefix + r));
21
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diff changeset
261 this.state.resultRelations = invrels;
17
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diff changeset
262 }
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263 },
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264 err => console.error("neo4j result error=", err),
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265 () => console.debug('neo4j result query Complete')
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diff changeset
266 );
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267 }
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268
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269
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diff changeset
270 filterAttributes(attributes: string[], normalized=false) {
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diff changeset
271 var atts = [];
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272 if (normalized) {
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273 attributes.forEach((att) => {
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274 if (att.substr(0, 3) == "_n_") {
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diff changeset
275 atts.push(att.substr(3));
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276 }
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277 });
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278 } else {
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279 atts = attributes.filter(elem => elem[0] != "_" && !this.excludedAttributes[elem]);
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280 }
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281 return atts;
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282 }
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283
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diff changeset
284 /**
20
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285 * Run the given queries on the Neo4J server.
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diff changeset
286 *
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287 * Returns an Observable with the results.
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288 */
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diff changeset
289 fetchCypherResults(queries: string[], params=[{}]) {
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diff changeset
290 console.debug("fetching cypher queries: ", queries);
1
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parents:
diff changeset
291 var headers = new Headers();
20
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diff changeset
292 var auth = this.neo4jAuthentication;
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293 headers.append('Authorization', 'Basic ' + btoa(`${auth.user}:${auth.password}`));
1
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294 headers.append('Content-Type', 'application/json');
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diff changeset
295 headers.append('Accept', 'application/json');
3
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296 // put headers in options
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297 var opts = {'headers': headers};
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298 // unpack queries into statements
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299 var statements = queries.map((q, i) => {
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300 return {'statement': q, 'parameters': (params[i])?params[i]:{}};
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301 });
3
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302 // create POST data from query
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303 var data = JSON.stringify({'statements': statements});
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304 // make post request asynchronously
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305 var resp = this._http.post(this.neo4jBaseUrl+'/transaction/commit', data, opts)
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306 // filter result as JSON
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307 .map(res => res.json());
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308 // return Observable
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309 return resp;
1
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310 }
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311
1
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312 }