Mercurial > hg > ng2-query-ismi
annotate app/query.service.ts @ 8:fa646ee46c19
more query generation.
author | casties |
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date | Mon, 18 Jan 2016 09:52:46 +0100 |
parents | 6cd6c09032aa |
children | 402c7229dc7c |
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} 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 |
8 | 13 public neo4jBaseUrl = 'http://localhost:7474/db/data/cypher/'; |
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14 public state: QueryState; |
8 | 15 public ismiObjectTypes: any; |
2 | 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 contains'}]; |
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20 |
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21 constructor(private _http: Http) { |
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22 this.state = { |
6 | 23 'steps': [], |
24 'cypherQuery': '', | |
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25 'cypherParams': {}, |
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26 'results': [], |
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27 'resultTypes': '', |
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28 'numResults': 0 |
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29 }; |
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30 } |
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31 |
8 | 32 setup() { |
33 this.setupIsmiObjectTypes(); | |
34 } | |
35 | |
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36 getState() { |
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37 return this.state; |
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38 } |
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39 |
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40 getQueryModes(): QueryMode[] { |
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41 return this.QUERY_MODES; |
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42 } |
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43 |
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44 getQueryOptions(queryMode: QueryMode) { |
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45 var options = ['a1', 'b1', 'c1']; |
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46 if (queryMode.id === 'att_contains') { |
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47 options = ['d', 'e', 'f']; |
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48 } else if (queryMode.id === 'type_is') { |
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49 options = this.ismiObjectTypes; |
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50 } |
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51 console.debug("getQueryOptions returns: ", options); |
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52 return options; |
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53 } |
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54 |
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55 setupIsmiObjectTypes() { |
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56 var query = `MATCH (n) WITH DISTINCT labels(n) AS labels |
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57 UNWIND labels AS label |
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58 RETURN DISTINCT label ORDER BY label`; |
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59 |
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60 var res = this.fetchCypherResult(query); |
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61 res.subscribe( |
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62 data => { |
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63 console.debug("neo4j data=", data); |
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64 this.ismiObjectTypes = data.data.map(elem => elem[0]).filter(elem => elem[0] != "_"); |
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65 console.debug("ismi types=", this.ismiObjectTypes); |
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66 }, |
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67 err => console.error("neo4j error=", err), |
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68 () => console.debug('neo4j query Complete') |
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69 ); |
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70 } |
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71 |
6 | 72 setQueryStep(index: number, step: QueryStep) { |
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73 this.state.steps[index] = step; |
6 | 74 this.createCypherQuery(); |
75 } | |
76 | |
77 createCypherQuery() { | |
78 var cypher = ''; | |
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79 var returnType = ''; |
8 | 80 for (var i=0; i < this.state.steps.length; ++i) { |
81 var step = this.state.steps[i]; | |
82 if (step.mode.id === 'type_is') { | |
83 cypher = `MATCH (e:${step.objectType}) return e`; | |
84 returnType = 'node'; | |
85 } | |
6 | 86 } |
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87 this.state.cypherQuery = cypher; |
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88 this.state.resultTypes = returnType; |
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89 } |
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90 |
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91 updateQuery() { |
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92 this.createCypherQuery(); |
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93 var query = this.state.cypherQuery; |
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94 var params = this.state.cypherParams; |
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95 var res = this.fetchCypherResult(query, params); |
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96 res.subscribe( |
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97 data => { |
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98 console.debug("neo4j data=", data); |
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99 this.state.results = data.data.map(elem => elem[0]); |
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100 this.state.numResults = this.state.results.length; |
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101 }, |
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102 err => console.error("neo4j error=", err), |
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103 () => console.debug('neo4j query Complete') |
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104 ); |
6 | 105 } |
106 | |
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107 fetchCypherResult(query: string, params = {}) { |
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108 var headers = new Headers(); |
2 | 109 headers.append('Authorization', 'Basic ' + btoa('neo4j' + ':' + 'neo5j')); |
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110 headers.append('Content-Type', 'application/json'); |
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111 headers.append('Accept', 'application/json'); |
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112 // put headers in options |
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113 var opts = {'headers': headers}; |
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114 // create POST data from query |
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115 var data = JSON.stringify({'query': query, 'params': params}); |
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116 // make post request asynchronously |
8 | 117 var resp = this._http.post(this.neo4jBaseUrl, data, opts) |
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118 // filter result as JSON |
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119 .map(res => res.json()); |
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120 // return Observable |
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121 return resp; |
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122 } |
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123 } |