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      1 /*
      2  * Copyright (C) 2009 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.content.Context;
     20 import android.database.DataSetObservable;
     21 import android.database.DataSetObserver;
     22 import android.text.TextUtils;
     23 import android.util.Log;
     24 
     25 import java.util.ArrayList;
     26 import java.util.Collection;
     27 import java.util.Collections;
     28 import java.util.HashMap;
     29 import java.util.List;
     30 
     31 /**
     32  * Maintains the list of all corpora.
     33  */
     34 public class SearchableCorpora implements Corpora {
     35 
     36     // set to true to enable the more verbose debug logging for this file
     37     private static final boolean DBG = false;
     38     private static final String TAG = "QSB.DefaultCorpora";
     39 
     40     private final DataSetObservable mDataSetObservable = new DataSetObservable();
     41 
     42     private final Context mContext;
     43     private final CorpusFactory mCorpusFactory;
     44 
     45     private Sources mSources;
     46     // Maps corpus names to corpora
     47     private HashMap<String,Corpus> mCorporaByName;
     48     // Maps sources to the corpus that contains them
     49     private HashMap<Source,Corpus> mCorporaBySource;
     50     // Enabled corpora
     51     private List<Corpus> mEnabledCorpora;
     52     // Web corpus
     53     private Corpus mWebCorpus;
     54 
     55     /**
     56      *
     57      * @param context Used for looking up source information etc.
     58      */
     59     public SearchableCorpora(Context context, Sources sources, CorpusFactory corpusFactory) {
     60         mContext = context;
     61         mCorpusFactory = corpusFactory;
     62         mSources = sources;
     63     }
     64 
     65     protected Context getContext() {
     66         return mContext;
     67     }
     68 
     69     public Collection<Corpus> getAllCorpora() {
     70         return Collections.unmodifiableCollection(mCorporaByName.values());
     71     }
     72 
     73     public Collection<Corpus> getEnabledCorpora() {
     74         return mEnabledCorpora;
     75     }
     76 
     77     public Corpus getCorpus(String name) {
     78         return mCorporaByName.get(name);
     79     }
     80 
     81     public Corpus getWebCorpus() {
     82         return mWebCorpus;
     83     }
     84 
     85     public Corpus getCorpusForSource(Source source) {
     86         return mCorporaBySource.get(source);
     87     }
     88 
     89     public Source getSource(String name) {
     90         if (TextUtils.isEmpty(name)) {
     91             Log.w(TAG, "Empty source name");
     92             return null;
     93         }
     94         return mSources.getSource(name);
     95     }
     96 
     97     public void update() {
     98         mSources.update();
     99 
    100         Collection<Corpus> corpora = mCorpusFactory.createCorpora(mSources);
    101 
    102         mCorporaByName = new HashMap<String,Corpus>(corpora.size());
    103         mCorporaBySource = new HashMap<Source,Corpus>(corpora.size());
    104         mEnabledCorpora = new ArrayList<Corpus>(corpora.size());
    105         mWebCorpus = null;
    106 
    107         for (Corpus corpus : corpora) {
    108             mCorporaByName.put(corpus.getName(), corpus);
    109             for (Source source : corpus.getSources()) {
    110                 mCorporaBySource.put(source, corpus);
    111             }
    112             if (corpus.isCorpusEnabled()) {
    113                 mEnabledCorpora.add(corpus);
    114             }
    115             if (corpus.isWebCorpus()) {
    116                 if (mWebCorpus != null) {
    117                     Log.w(TAG, "Multiple web corpora: " + mWebCorpus + ", " + corpus);
    118                 }
    119                 mWebCorpus = corpus;
    120             }
    121         }
    122 
    123         if (DBG) Log.d(TAG, "Updated corpora: " + mCorporaBySource.values());
    124 
    125         mEnabledCorpora = Collections.unmodifiableList(mEnabledCorpora);
    126 
    127         notifyDataSetChanged();
    128     }
    129 
    130     public void registerDataSetObserver(DataSetObserver observer) {
    131         mDataSetObservable.registerObserver(observer);
    132     }
    133 
    134     public void unregisterDataSetObserver(DataSetObserver observer) {
    135         mDataSetObservable.unregisterObserver(observer);
    136     }
    137 
    138     protected void notifyDataSetChanged() {
    139         mDataSetObservable.notifyChanged();
    140     }
    141 }
    142