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      1 /*
      2  * Copyright (C) 2010 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.quicksearchbox;
     18 
     19 import android.util.Log;
     20 
     21 import java.util.ArrayList;
     22 import java.util.Collection;
     23 import java.util.Collections;
     24 import java.util.Comparator;
     25 import java.util.List;
     26 import java.util.Map;
     27 
     28 public class DefaultCorpusRanker extends AbstractCorpusRanker {
     29 
     30     private static final boolean DBG = false;
     31     private static final String TAG = "QSB.DefaultCorpusRanker";
     32 
     33     private final ShortcutRepository mShortcuts;
     34 
     35     public DefaultCorpusRanker(Corpora corpora, ShortcutRepository shortcuts) {
     36         super(corpora);
     37         mShortcuts = shortcuts;
     38     }
     39 
     40     private static class CorpusComparator implements Comparator<Corpus> {
     41         private final Map<String,Integer> mClickScores;
     42 
     43         public CorpusComparator(Map<String,Integer> clickScores) {
     44             mClickScores = clickScores;
     45         }
     46 
     47         public int compare(Corpus corpus1, Corpus corpus2) {
     48             boolean corpus1IsDefault = corpus1.isCorpusDefaultEnabled();
     49             boolean corpus2IsDefault = corpus2.isCorpusDefaultEnabled();
     50 
     51             if (corpus1IsDefault != corpus2IsDefault) {
     52                 // Default corpora always come before non-default
     53                 return corpus1IsDefault ? -1 : 1;
     54             } else {
     55                 // Then by descending score
     56                 return getCorpusScore(corpus2) - getCorpusScore(corpus1);
     57             }
     58         }
     59 
     60         /**
     61          * Scores a corpus. Higher score is better.
     62          */
     63         private int getCorpusScore(Corpus corpus) {
     64             // Web corpus always comes first
     65             if (corpus.isWebCorpus()) {
     66                 return Integer.MAX_VALUE;
     67             }
     68             // Then use click score
     69             Integer clickScore = mClickScores.get(corpus.getName());
     70             if (clickScore != null) {
     71                 return clickScore;
     72             }
     73             return 0;
     74         }
     75     }
     76 
     77     @Override
     78     public List<Corpus> rankCorpora(Corpora corpora) {
     79         Collection<Corpus> enabledCorpora = corpora.getEnabledCorpora();
     80         if (DBG) Log.d(TAG, "Ranking: " + enabledCorpora);
     81 
     82         Map<String,Integer> clickScores = mShortcuts.getCorpusScores();
     83         ArrayList<Corpus> ordered = new ArrayList<Corpus>(enabledCorpora);
     84         Collections.sort(ordered, new CorpusComparator(clickScores));
     85 
     86         if (DBG) Log.d(TAG, "Click scores: " + clickScores);
     87         if (DBG) Log.d(TAG, "Ordered: " + ordered);
     88         return ordered;
     89     }
     90 
     91 }
     92