Mercurial > hg > ng2-query-ismi

annotate app/query.service.ts @ 10:66dce99cef4e

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attribute contains works now.
author Robert Casties <casties@mpiwg-berlin.mpg.de>
date Wed, 20 Jan 2016 17:02:00 +0100
parents 402c7229dc7c
children 6989cd00e8d7
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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} 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 public QUERY_MODES: QueryMode[] = [
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18 {id: 'type_is', label:'Object type is'},
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19 {id: 'att_contains', label: 'Attribute'}];
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20
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21 constructor(private _http: Http) {
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22 this.state = {
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23 'steps': [],
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24 'resultCypherQuery': '',
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25 'resultCypherParams': {},
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26 'attributeCypherQuery': '',
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27 'results': [],
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28 'resultTypes': '',
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29 'numResults': 0
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30 };
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31 }
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32
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33 setup() {
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34 this.setupIsmiObjectTypes();
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35 }
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36
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37 getState() {
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38 return this.state;
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39 }
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40
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41 getQueryModes(): QueryMode[] {
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42 return this.QUERY_MODES;
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43 }
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44
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45 getQueryOptions(queryMode: QueryMode) {
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46 var options = ['a1', 'b1', 'c1'];
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47 if (queryMode.id === 'att_contains') {
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48 options = this.state.nextQueryAttributes;
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49 } else if (queryMode.id === 'type_is') {
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50 options = this.ismiObjectTypes;
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51 }
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52 console.debug("getQueryOptions returns: ", options);
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53 return options;
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54 }
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55
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56 setupIsmiObjectTypes() {
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57 var query = `MATCH (n) WITH DISTINCT labels(n) AS labels
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58 UNWIND labels AS label
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59 RETURN DISTINCT label ORDER BY label`;
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60
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61 var res = this.fetchCypherResult(query);
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62 res.subscribe(
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63 data => {
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64 console.debug("neo4j data=", data);
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65 this.ismiObjectTypes = data.results[0].data.map(elem => elem.row[0]).filter(elem => elem[0] != "_");
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66 console.debug("ismi types=", this.ismiObjectTypes);
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67 },
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68 err => console.error("neo4j error=", err),
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69 () => console.debug('neo4j query Complete')
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70 );
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71 }
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72
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73 setQueryStep(index: number, step: QueryStep) {
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74 this.state.steps[index] = step;
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75 this.createCypherQuery();
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76 }
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77
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78 createCypherQuery() {
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79 var queryMatch = '';
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80 var queryWhere = '';
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81 var queryReturn = '';
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82 var resultQuery = '';
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83 var attQuery = '';
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84 var returnType = '';
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85 this.state.steps.forEach((step) => {
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86 // object type is
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87 if (step.mode.id === 'type_is') {
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88 queryMatch = `MATCH (n:${step.objectType})`;
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89 queryWhere = '';
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90 queryReturn = 'RETURN n';
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91 returnType = 'node';
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92 }
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93
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94 // attribute contains
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95 if (step.mode.id === 'att_contains') {
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96 queryWhere = `WHERE lower(n.${step.attribute}) CONTAINS lower('${step.value}')`;
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97 queryReturn = 'RETURN n';
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98 returnType = 'node';
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99 }
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100
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101 });
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102 resultQuery = queryMatch + ' ' + queryWhere + ' ' + queryReturn;
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103 attQuery = queryMatch + ' ' + queryWhere + ' WITH DISTINCT keys(n) AS atts UNWIND atts AS att RETURN DISTINCT att ORDER BY att';
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104 this.state.resultCypherQuery = resultQuery;
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105 this.state.attributeCypherQuery = attQuery;
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106 this.state.resultTypes = returnType;
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107 }
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108
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109 updateQuery() {
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110 this.createCypherQuery();
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111 // run query for result table
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112 var resQuery = this.state.resultCypherQuery;
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113 var resParams = this.state.cypherParams;
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114 var resRes = this.fetchCypherResult(resQuery, resParams);
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115 resRes.subscribe(
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116 data => {
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117 console.debug("neo4j result data=", data);
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118 this.state.results = data.results[0].data.map(elem => elem.row[0]);
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119 this.state.numResults = this.state.results.length;
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120 },
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121 err => console.error("neo4j result error=", err),
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122 () => console.debug('neo4j result query Complete')
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123 );
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124 // run query for attribute list
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125 if (this.state.attributeCypherQuery) {
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126 var attRes = this.fetchCypherResult(this.state.attributeCypherQuery);
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127 attRes.subscribe(
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128 data => {
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129 console.debug("neo4j att data=", data);
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130 this.state.nextQueryAttributes = data.results[0].data.map(elem => elem.row[0]).filter(elem => elem[0] != "_");;
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131 },
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132 err => console.error("neo4j att error=", err),
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133 () => console.debug('neo4j att query Complete')
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134 );
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135 }
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136 }
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137
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138 fetchCypherResult(query: string, params = {}) {
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139 console.debug("fetching cypher query: ", query);
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140 var headers = new Headers();
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141 headers.append('Authorization', 'Basic ' + btoa('neo4j' + ':' + 'neo5j'));
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142 headers.append('Content-Type', 'application/json');
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143 headers.append('Accept', 'application/json');
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144 // put headers in options
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145 var opts = {'headers': headers};
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146 // create POST data from query
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147 var data = JSON.stringify({'statements': [
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148 {'statement': query, 'parameters': params}
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149 ]});
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150 // make post request asynchronously
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151 var resp = this._http.post(this.neo4jBaseUrl+'/transaction/commit', data, opts)
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152 // filter result as JSON
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153 .map(res => res.json());
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154 // return Observable
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155 return resp;
1
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156 }
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157 }