D-Net

    getProjectsforDataProvider (datasourceId: string, page: number, size: number ):any {

      let url = OpenaireProperties.getSearchResourcesAPIURL();

      var basicQuery = "(oaftype exact project) "

      url += "?query=";

      if(datasourceId!= null && datasourceId != ''  ) {

        url +=" ( "+basicQuery+ " ) " +" and (collectedfromdatasourceid exact \"" + datasourceId + "\")";

      }else{

        url +=" ( "+basicQuery+ " ) ";

      }

      url += "&page="+(page-1)+"&size="+size;

      url += "&format=json";

      let key = url;

      if (this._cache.has(key)) {

        return Observable.of(this._cache.get(key));

      }

      return this.http.get(url)

      .map(res => <any> res.json())

      .map(res => [res['meta'].total, this.parseResults(res['results'])])

      .do(res => {

        this._cache.set(key, res);

      });

    }