SearchableCorpora.java revision b83882b9efa37ec0f20a0f1c85cf5ccc93194aee 
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
17package com.android.quicksearchbox;
18
19import android.content.Context;
20import android.database.DataSetObservable;
21import android.database.DataSetObserver;
22import android.text.TextUtils;
23import android.util.Log;
24
25import java.util.ArrayList;
26import java.util.Collection;
27import java.util.Collections;
28import java.util.HashMap;
29import java.util.List;
30
31/**
32 * Maintains the list of all corpora.
33 */
34public 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 List<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