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import {throwError as observableThrowError, Observable} from 'rxjs';
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import {Injectable} from '@angular/core';
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import {Http, Response} from '@angular/http';
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import { HttpClient } from '@angular/common/http';
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import { ClaimResult} from '../claimEntities.class';
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import {map} from "rxjs/operators";
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@Injectable()
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export class SearchCrossrefService {
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constructor( private http: HttpClient ) {}
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searchCrossrefResults (term: string, size : number, page : number, apiUrl:string, parse:boolean = false):any {
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let url = apiUrl+'?query='+term+'&rows='+size+'&offset='+(size*(page-1));
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let key = url;
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return this.http.get(url)
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//.map(request => <any> request.json().message)
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.pipe(map(request => request['message']))
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.pipe(map(request => (parse?this.parse(request.items):request)))
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//.catch(this.handleError);
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}
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searchCrossrefByDOIs(DOIs: string[], apiUrl:string, parse:boolean = false):any {
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var doisParams = "";
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for(var i =0 ;i < DOIs.length; i++){
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doisParams+=(doisParams.length > 0?",":"")+'doi:'+DOIs[i];
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}
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let url = apiUrl+'?filter='+doisParams;
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let key = url;
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return this.http.get(url)
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//.map(request => <any> request.json().message)
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.pipe(map(request => request['message']))
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.pipe(map(request => (parse?this.parse(request.items):request)))
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//.catch(this.handleError);
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}
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searchCrossrefByMultipleDOIs(dois: string[], apiUrl:string, parse:boolean = false):any {
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let url = apiUrl+'?filter=doi:';
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for(var i=0; i<dois.length; i++){
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url=url+(url.length==0?'':',')+'doi:'+dois[i];
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}
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url = apiUrl+'?filter='+url;
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let key = url;
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return this.http.get(url)
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//.map(request => <any> request.json().message)
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.pipe(map(request => request['message']))
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.pipe(map(request => (parse?this.parse(request.items):request)))
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//.catch(this.handleError);
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}
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private handleError (error: Response) {
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// in a real world app, we may send the error to some remote logging infrastructure
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// instead of just logging it to the console
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console.log(error);
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return observableThrowError(error || 'Server error');
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}
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parse(response):ClaimResult[]{
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var results:ClaimResult[] = [];
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for(var i=0; i<response.length; i++){
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var item=response[i];
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var result:ClaimResult = new ClaimResult();
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result.publisher = null;
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result.journal = null;
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result.DOI = item.DOI;
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result.id = item.DOI;
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result.title = item.title;
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result.url = item.URL;
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result.source = 'crossref';
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result.type = 'publication';
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if(item['published-print']){
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result.date = item['published-print']['date-parts'][0];
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}
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result.accessRights = "OPEN";
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result.publisher = item.publisher;
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result.journal = null;
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result.result = item;
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if(item.author){
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for(var j=0; j<item.author.length; j++){
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result.authors.push(item.author[j].family+", "+item.author[j].given);
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}
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}
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if(item.editor){
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for(var j=0; j<item.editor.length; j++){
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result.editors.push(item.editor[j].family+", "+item.editor[j].given);
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}
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}
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results.push(result);
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}
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return results;
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}
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}
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