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src/services/statement.base.service.ts 4.18 KB
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1392e7de   Yarik   Awesome 
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  import { Headers, Http, Response } from '@angular/http';
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  import { IGetRowsParams } from 'ag-grid/main';
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  import { Observable } from 'rxjs/Observable';
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  import 'rxjs/add/operator/toPromise';
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  import 'rxjs/add/operator/map';
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  export abstract class StatementBaseService {
      protected abstract url: string;
      protected headers: Headers = new Headers({'Content-Type': 'application/json'});
  
      constructor(protected http: Http) { }
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      getData(params: IGetRowsParams): Promise<any[]> {
        let sort: string = null;
        if (params.sortModel.length) {
          sort = this.parseSort(params.sortModel[0]);
        }
        let url: string = this.url;
        url += '?from=' + params.startRow + '&perPage=' + (params.endRow - params.startRow);
        if (sort) {
                url += '&sort=' + sort;
            }
        let filter: string = this.parseFilter(params.filterModel);
        if (filter) {
          url += '&filter=' + filter;
        }
        return this.http.get(url)
                .toPromise()
                .then((response: Response) => {
                  let data: any[] = this.parseModels(response.json());
                  if (!data.length) {
                        data = [this.createModel()];
                    }
                  let lastRow: number = -1;
                  if (data.length < (params.endRow - params.startRow)) {
                        lastRow = data.length;
                    }
                  params.successCallback(data, lastRow);
                  return data;
                })
                .catch(this.handleError);
      }
  
    // getData(params: IGetRowsParams): Observable<any[]> {
    //   let sort: string = null;
    //   if (params.sortModel.length) {
    //     sort = this.parseSort(params.sortModel[0]);
    //   }
    //   let url: string = this.url;
    //   url += '?from=' + params.startRow + '&perPage=' + (params.endRow - params.startRow);
    //   if (sort) {
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    //           url += '&sort=' + sort;
    //       }
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    //   let filter: string = this.parseFilter(params.filterModel);
    //   if (filter) {
    //     url += '&filter=' + filter;
    //   }
    //   return this.http.get(url)
    //             .map((response: Response) => this.parseModels(response.json()));
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    // }
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    update(id: number, data: string): Promise<any> {
      return this.http.post(this.url + '/update?id=' + id, data, { headers: this.headers })
        .toPromise()
        .then((response: Response) => response.json())
        .catch(this.handleError);
    }
  
    create(data: string): Promise<any> {
      return this.http.post(this.url + '/create', data, { headers: this.headers })
        .toPromise()
        .then((response: Response) => this.parseModel(response.json()))
        .catch(this.handleError);
    }
  
    delete(id: number): Promise<any> {
      return this.http.delete(this.url + '/delete?id=' + id, { headers: this.headers })
        .toPromise()
        .then((response: Response) => response.json())
        .catch(this.handleError);
    }
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    public abstract createModel(): Object;
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    protected handleError(error: any): Promise<any> {
      console.error('An error occured', error);
      return Promise.reject(error.message || error);
    }
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    protected parseSort(sort: any): string {
        if (sort.colId && sort.sort) {
            let result = sort.colId;
            if (sort.sort === 'desc') {
                result = '-' + result;
            }
            return result;
        }
        return null;
    }
  
    protected parseFilter(filter: Object): string {
      let result: string = '';
      for (let property in filter) {
        let value: string = filter[property].filter;
        let operator: string = filter[property].type;
        let symbol: string;
        switch (operator) {
          case 'contains':
            symbol = '*';
            break;
          case 'equals':
            symbol = '=';
            break;
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          case 'notEquals':
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            symbol = '!';
            break;
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          case 'startsWith':
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            symbol = '^';
            break;
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          case 'endsWith':
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            symbol = '$';
            break;
          default:
        }
        if (symbol.length) {
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          result += symbol + property + '_' + value + ';';
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        }
      }
      if (result.length) {
        return result;
      } else {
        return null;
      }
    }
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    protected abstract parseModels(json: any): any[];
    protected abstract parseModel(json: any): any;
  }