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import {throwError as observableThrowError} from 'rxjs';
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import {Injectable} from '@angular/core';
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import {Response} from '@angular/http';
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import {HttpClient} from '@angular/common/http';
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import {ClaimEntity, ClaimResult} from '../claimHelper.class';
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import {map} from "rxjs/operators";
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import {EnvProperties} from "../../../utils/properties/env-properties";
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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, properties: EnvProperties, parse: boolean = false): any {
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let url = properties.searchCrossrefAPIURL + '?query=' + term + '&rows=' + size + '&offset=' + (size * (page - 1));
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return this.http.get((properties.useCache) ? (properties.cacheUrl + encodeURIComponent(url)) : url)
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.pipe(map(request => request['message']))
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.pipe(map(request => [request["total-results"], parse ? this.parse(request.items) : request]))
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//.catch(this.handleError);
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}
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searchCrossrefByDOIs(DOIs: string[], properties: EnvProperties, 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 = properties.searchCrossrefAPIURL + '?filter=' + doisParams;
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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 => [request["total-results"], parse ? this.parse(request['items']) : request]))
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//.catch(this.handleError);
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}
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searchCrossrefByMultipleDOIs(dois: string[], properties: EnvProperties, parse: boolean = false): any {
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let url = properties.searchCrossrefAPIURL + '?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 = properties.searchCrossrefAPIURL + '?filter=' + 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 => [request["total-results"], 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): ClaimEntity[] {
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const results: ClaimEntity[] = [];
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for (let i = 0; i < response.length; i++) {
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const item = response[i];
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const entity: ClaimEntity = new ClaimEntity();
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entity.result = new ClaimResult();
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entity.result.publisher = null;
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entity.result.journal = null;
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entity.result.DOI = item.DOI;
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entity.id = item.DOI;
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entity.title = item.title;
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entity.result.url = item.URL;
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entity.result.source = 'crossref';
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entity.type = 'publication';
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if (item['published-print']) {
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entity.result.date = item['published-print']['date-parts'][0][0];
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}
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entity.result.accessRights = "OPEN";
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entity.result.publisher = item.publisher;
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entity.result.journal = null;
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entity.result.record = item;
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if (item.author) {
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entity.result.authors = [];
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for (let j = 0; j < item.author.length; j++) {
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entity.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 (let j = 0; j < item.editor.length; j++) {
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entity.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(entity);
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}
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return results;
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}
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}
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