Mercurial > hg > ng2-query-ismi

annotate app/query.service.ts @ 6:9f5473536a98

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more query generation.
author casties
date Thu, 14 Jan 2016 17:19:35 +0100
parents b06a5d61afed
children 6cd6c09032aa
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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 queryState: QueryState;
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15 public ismiObjectTypes;
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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 contains'}];
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21 constructor(private _http: Http) {
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22 this.queryState = {
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23 'steps': [],
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24 'cypherQuery': '',
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25 'cyperParams': {},
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26 'results': [],
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27 numResults: 0};
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28 }
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29
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30 getQueryModes(): QueryMode[] {
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31 return this.QUERY_MODES;
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32 }
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33
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34 getQueryOptions(queryMode: QueryMode) {
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35 var options = ['a1', 'b1', 'c1'];
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36 if (queryMode.id === 'att_contains') {
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37 options = ['d', 'e', 'f'];
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38 } else if (queryMode.id === 'type_is') {
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39 options = this.ismiObjectTypes;
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40 }
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41 console.debug("getQueryOptions returns: ", options);
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42 return options;
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43 }
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44
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45 setupIsmiObjectTypes() {
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46 var query = `MATCH (n) WITH DISTINCT labels(n) AS labels
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47 UNWIND labels AS label
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48 RETURN DISTINCT label ORDER BY label`;
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49
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50 var res = this.fetchCypherResult(query);
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51 res.subscribe(
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52 data => {
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53 console.debug("neo4j data=", data);
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54 this.ismiObjectTypes = data.data.map(elem => elem[0]).filter(elem => elem[0] != "_");
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55 console.debug("ismi types=", this.ismiObjectTypes);
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56 },
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57 err => console.error("neo4j error=", err),
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58 () => console.debug('neo4j query Complete')
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59 );
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60 }
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61
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62 setQueryStep(index: number, step: QueryStep) {
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63 this.queryState.steps[index] = step;
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64 this.createCypherQuery();
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65 }
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66
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67 createCypherQuery() {
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68 var cypher = '';
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69 var step = this.queryState.steps[0];
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70 if (step.mode.id === 'type_is') {
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71 cypher = `MATCH (e:${step.objectType}) return e`;
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72 }
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73
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74 this.queryState.cypherQuery = cypher;
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75 }
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76
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77 fetchCypherResult(query: string, params = {}) {
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78 var headers = new Headers();
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79 headers.append('Authorization', 'Basic ' + btoa('neo4j' + ':' + 'neo5j'));
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80 headers.append('Content-Type', 'application/json');
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81 headers.append('Accept', 'application/json');
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82 // put headers in options
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83 var opts = {'headers': headers};
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84 // create POST data from query
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85 var data = JSON.stringify({'query': query, 'params': params});
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86 // make post request asynchronously
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87 var resp = this._http.post('http://localhost:7474/db/data/cypher/', data, opts)
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88 // filter result as JSON
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89 .map(res => res.json());
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90 // return Observable
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91 return resp;
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92 }
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93 }