Mercurial > hg > ng2-query-ismi

annotate app/query.service.ts @ 12:1843b12eff9a

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cleaning output.
author casties
date Thu, 21 Jan 2016 11:16:13 +0100
parents 6989cd00e8d7
children 98b435bb6c0c
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1
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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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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 = 'http://localhost:7474/db/data';
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14 public state: QueryState;
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15 public ismiObjectTypes: any;
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16
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17 constructor(private _http: Http) {
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18 this.state = {
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19 'steps': [],
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20 'resultCypherQuery': '',
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21 'cypherQueryParams': {},
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22 'attributesCypherQuery': '',
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23 'relationsCypherQuery': '',
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24 'results': [],
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25 'resultTypes': '',
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26 'numResults': 0,
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27 'resultInfo': ''
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28 };
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29 }
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30
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31 setup() {
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32 this.setupIsmiObjectTypes();
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33 }
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34
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35 getState() {
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36 return this.state;
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37 }
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38
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39 getQueryModes(): QueryMode[] {
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40 return QUERY_MODES;
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41 }
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42
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43 getQueryOptions(queryMode: QueryMode) {
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44 var options = ['a1', 'b1', 'c1'];
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45 if (queryMode.id === 'type_is') {
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46 options = this.ismiObjectTypes;
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47 } else if (queryMode.id === 'relation_is') {
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48 options = this.state.nextQueryRelations;
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49 } else if (queryMode.id === 'att_contains') {
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50 options = this.state.nextQueryAttributes;
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51 } else if (queryMode.id === 'att_contains_norm') {
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52 options = this.state.nextQueryAttributes;
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53 }
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54 console.debug("getQueryOptions returns: ", options);
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55 return options;
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56 }
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57
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58 setupIsmiObjectTypes() {
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59 var query = `MATCH (n) WITH DISTINCT labels(n) AS labels
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60 UNWIND labels AS label
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61 RETURN DISTINCT label ORDER BY label`;
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62
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63 var res = this.fetchCypherResult(query);
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64 res.subscribe(
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65 data => {
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66 console.debug("neo4j data=", data);
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67 this.ismiObjectTypes = data.results[0].data.map(elem => elem.row[0]).filter(elem => elem[0] != "_");
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68 console.debug("ismi types=", this.ismiObjectTypes);
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69 },
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70 err => console.error("neo4j error=", err),
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71 () => console.debug('neo4j query Complete')
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72 );
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73 }
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74
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75 setQueryStep(index: number, step: QueryStep) {
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76 this.state.steps[index] = step;
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77 this.createCypherQuery();
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78 }
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79
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80 createCypherQuery() {
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81 var queryMatch = '';
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82 var queryWhere = '';
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83 var queryReturn = '';
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84 var queryParams = {};
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85 var resultQuery = '';
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86 var attributesQuery = '';
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87 var relationsQuery = '';
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88 var returnType = '';
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89 var nIdx = 1;
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90 this.state.steps.forEach((step, stepIdx) => {
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91 // object type is
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92 if (step.mode.id === 'type_is') {
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93 queryMatch = `MATCH (n${nIdx}:${step.objectType})`;
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94 queryWhere = '';
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95 queryReturn = `RETURN n${nIdx}`;
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96 returnType = 'node';
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97 }
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98
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99 // relation type is
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100 if (step.mode.id === 'relation_is') {
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101 nIdx += 1;
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102 queryMatch += `-[:\`${step.relationType}\`]->(n${nIdx})`;
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103 queryReturn = `RETURN n${nIdx}`;
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104 returnType = 'node';
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105 }
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106
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107 // attribute contains
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108 if (step.mode.id === 'att_contains') {
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109 if (!queryWhere) {
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110 queryWhere = 'WHERE ';
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111 } else {
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112 queryWhere += ' AND ';
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113 }
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114 queryWhere += `lower(n${nIdx}.${step.attribute}) CONTAINS lower({att_val${stepIdx}})`;
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115 queryParams[`att_val${stepIdx}`] = step.value;
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116 }
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117
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118 // attribute contains (normalized)
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119 if (step.mode.id === 'att_contains_norm') {
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120 if (!queryWhere) {
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121 queryWhere = 'WHERE ';
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122 } else {
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123 queryWhere += ' AND ';
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124 }
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125 queryWhere += `lower(n${nIdx}._n_${step.attribute}) CONTAINS lower('${step.value}')`;
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126 }
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127
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128 });
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129 resultQuery = queryMatch + '\n' + queryWhere + '\n' + queryReturn;
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130 attributesQuery = queryMatch + ' ' + queryWhere + ` WITH DISTINCT keys(n${nIdx}) AS atts UNWIND atts AS att RETURN DISTINCT att ORDER BY att`;
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131 relationsQuery = queryMatch + '-[r]-() ' + queryWhere + ' RETURN DISTINCT type(r)';
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132 this.state.resultCypherQuery = resultQuery;
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133 this.state.cypherQueryParams = queryParams;
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134 this.state.attributesCypherQuery = attributesQuery;
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135 this.state.relationsCypherQuery = relationsQuery;
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136 this.state.resultTypes = returnType;
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137 }
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138
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139 updateQuery() {
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140 this.createCypherQuery();
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141 // run query for result table
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142 var resQuery = this.state.resultCypherQuery;
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143 var queryParams = this.state.cypherQueryParams;
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144 var resRes = this.fetchCypherResult(resQuery, queryParams);
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145 resRes.subscribe(
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146 data => {
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147 console.debug("neo4j result data=", data);
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148 this.state.results = data.results[0].data.map(elem => elem.row[0]);
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149 this.state.numResults = this.state.results.length;
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150 // count all types
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151 var resTypes = {};
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152 this.state.results.forEach((r) => {
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153 if (resTypes[r.type] == null) {
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154 resTypes[r.type] = 1;
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155 } else {
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156 resTypes[r.type] += 1;
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157 }
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158 });
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159 var info = '';
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160 for (var t in resTypes) {
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161 info += t + '(' + resTypes[t] + ') ';
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162 }
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163 this.state.resultInfo = info.substr(0, info.length-1);
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164 },
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165 err => console.error("neo4j result error=", err),
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166 () => console.debug('neo4j result query Complete')
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167 );
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168 // run query for attribute list
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169 if (this.state.attributesCypherQuery) {
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170 var attRes = this.fetchCypherResult(this.state.attributesCypherQuery, queryParams);
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171 attRes.subscribe(
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172 data => {
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173 console.debug("neo4j att data=", data);
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174 this.state.nextQueryAttributes = data.results[0].data.map(elem => elem.row[0]).filter(elem => elem[0] != "_");;
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175 },
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176 err => console.error("neo4j att error=", err),
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177 () => console.debug('neo4j att query Complete')
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178 );
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179 }
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180 // run query for relations list
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181 if (this.state.relationsCypherQuery) {
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182 var attRes = this.fetchCypherResult(this.state.relationsCypherQuery, queryParams);
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183 attRes.subscribe(
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184 data => {
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185 console.debug("neo4j rel data=", data);
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186 this.state.nextQueryRelations = data.results[0].data.map(elem => elem.row[0]).filter(elem => elem[0] != "_");;
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187 },
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188 err => console.error("neo4j rel error=", err),
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189 () => console.debug('neo4j rel query Complete')
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190 );
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191 }
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192 }
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193
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194 fetchCypherResult(query: string, params = {}) {
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195 console.debug("fetching cypher query: ", query);
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196 var headers = new Headers();
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197 headers.append('Authorization', 'Basic ' + btoa('neo4j' + ':' + 'neo5j'));
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198 headers.append('Content-Type', 'application/json');
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199 headers.append('Accept', 'application/json');
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200 // put headers in options
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201 var opts = {'headers': headers};
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202 // create POST data from query
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203 var data = JSON.stringify({'statements': [
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204 {'statement': query, 'parameters': params}
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205 ]});
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206 // make post request asynchronously
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207 var resp = this._http.post(this.neo4jBaseUrl+'/transaction/commit', data, opts)
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208 // filter result as JSON
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209 .map(res => res.json());
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210 // return Observable
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211 return resp;
1
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212 }
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213 }