Home | History | Annotate | Download | only in model 
      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.settings.intelligence.suggestions.model;
     18 
     19 import android.service.settings.suggestions.Suggestion;
     20 import android.util.ArraySet;
     21 
     22 import java.util.ArrayList;
     23 import java.util.HashMap;
     24 import java.util.List;
     25 import java.util.Map;
     26 import java.util.Set;
     27 
     28 public class SuggestionListBuilder {
     29 
     30     private Map<SuggestionCategory, List<Suggestion>> mSuggestions;
     31     private boolean isBuilt;
     32 
     33     public SuggestionListBuilder() {
     34         mSuggestions = new HashMap<>();
     35     }
     36 
     37     public void addSuggestions(SuggestionCategory category, List<Suggestion> suggestions) {
     38         if (isBuilt) {
     39             throw new IllegalStateException("Already built suggestion list, cannot add new ones");
     40         }
     41         mSuggestions.put(category, suggestions);
     42     }
     43 
     44     public List<Suggestion> build() {
     45         isBuilt = true;
     46         return dedupeSuggestions();
     47     }
     48 
     49     /**
     50      * Filter suggestions list so they are all unique.
     51      */
     52     private List<Suggestion> dedupeSuggestions() {
     53         final Set<String> ids = new ArraySet<>();
     54         final List<Suggestion> suggestions = new ArrayList<>();
     55         for (List<Suggestion> suggestionsInCategory : mSuggestions.values()) {
     56             suggestions.addAll(suggestionsInCategory);
     57         }
     58         for (int i = suggestions.size() - 1; i >= 0; i--) {
     59             final Suggestion suggestion = suggestions.get(i);
     60             final String id = suggestion.getId();
     61             if (ids.contains(id)) {
     62                 suggestions.remove(i);
     63             } else {
     64                 ids.add(id);
     65             }
     66         }
     67         return suggestions;
     68     }
     69 }