fetch possible values for gallery view

pdb-js/src/app/plot.service.ts

@@ -1,6 +1,7 @@
 import { Injectable, OnInit } from '@angular/core';
 import { HttpClient, HttpParams } from '@angular/common/http';
 import { Observable } from 'rxjs/Observable';
+import { map } from 'rxjs/operators';
 
 
 @Injectable({
@@ -39,12 +40,13 @@ export class PlotService {
     return this.http.get<Array<string>>('//'+window.location.hostname+':8080/fields');
   }
   
-  autocomplete(query: string, caretIndex: number): Observable<AutocompleteResult>
+  autocomplete(query: string, caretIndex: number, resultMode: ResultMode): Observable<AutocompleteResult>
   {
     const options = { 
       params: new HttpParams()
         .set('caretIndex', ""+caretIndex)
-        .set('query', query) 
+        .set('query', query)
+        .set('resultMode', resultMode)
     };
     return this.http.get<AutocompleteResult>('//'+window.location.hostname+':8080/autocomplete', options);
   }
@@ -58,6 +60,16 @@ export class PlotService {
   getFilterDefaults(): Observable<FilterDefaults>{
     return this.http.get<FilterDefaults>('//'+window.location.hostname+':8080/filters/defaults')
   }
+  
+  splitQuery(query: string, splitBy:string) : Observable<Array<string>>{
+    
+    const q = "("+query+") and "+splitBy+"=";
+    return this.autocomplete(q, q.length+1, ResultMode.FULL_VALUES).pipe(
+      map(
+        autocompleteResult => autocompleteResult.proposals.map(suggestion => suggestion.value)
+      )
+    );
+  }
 }
 
 
@@ -172,3 +184,8 @@ export class FilterDefaults {
   fields: Array<string>; 
   splitBy: string;
 }
+
+export enum ResultMode {
+  CUT_AT_DOT = "CUT_AT_DOT", 
+  FULL_VALUES = "FULL_VALUES"
+}