45621: filters facet route service

src/app/shared/route.service.ts

@@ -0,0 +1,47 @@
+import { Injectable, OnDestroy } from '@angular/core';
+import { Observable } from 'rxjs/Observable';
+import { ActivatedRoute, convertToParamMap, Params, } from '@angular/router';
+import { isNotEmpty } from './empty.util';
+
+@Injectable()
+export class RouteService {
+
+  constructor(private route: ActivatedRoute) {
+  }
+
+  hasQueryParam(paramName: string): Observable<boolean> {
+    return this.route.queryParamMap.map((map) => map.has(paramName));
+  }
+
+  hasQueryParamWithValue(paramName: string, paramValue: string): Observable<boolean> {
+    return this.route.queryParamMap.map((map) => map.getAll(paramName).indexOf(paramValue) > -1);
+  }
+
+  addQueryParameterValue(paramName: string, paramValue: string): Observable<Params> {
+    return this.route.queryParams.map((currentParams) => {
+      const newParam = {};
+      newParam[paramName] = [...convertToParamMap(currentParams).getAll(paramName), paramValue];
+      return Object.assign({}, currentParams, newParam);
+    });
+  }
+
+  removeQueryParameterValue(paramName: string, paramValue: string): Observable<Params> {
+    return this.route.queryParams.map((currentParams) => {
+      const newParam = {};
+      const currentFilterParams = convertToParamMap(currentParams).getAll(paramName);
+      if (isNotEmpty(currentFilterParams)) {
+        newParam[paramName] = currentFilterParams.filter((param) => (param !== paramValue));
+      }
+      return Object.assign({}, currentParams, newParam);
+    });
+  }
+
+  removeQueryParameter(paramName: string): Observable<Params> {
+    return this.route.queryParams.map((currentParams) => {
+      const newParam = {};
+      newParam[paramName] = {};
+      return Object.assign({}, currentParams, newParam);
+    });
+
+  }
+}