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 */
16package com.android.quicksearchbox;
17
18import java.util.HashSet;
19import java.util.Set;
20
21/**
22 * Promotes shortcuts and suggestions from a single corpus.
23 */
24public class SingleCorpusPromoter implements Promoter {
25
26    private final Corpus mCorpus;
27
28    private final int mMaxShortcuts;
29
30    private final Set<String> mAllowedSources;
31
32    public SingleCorpusPromoter(Corpus corpus, int maxShortcuts) {
33        mCorpus = corpus;
34        mMaxShortcuts = maxShortcuts;
35        mAllowedSources = new HashSet<String>();
36        for (Source source : corpus.getSources()) {
37            mAllowedSources.add(source.getName());
38        }
39    }
40
41    public void pickPromoted(Suggestions suggestions, int maxPromoted,
42            ListSuggestionCursor promoted) {
43        // Add shortcuts
44        SuggestionCursor shortcuts = suggestions.getShortcuts();
45        promoteUntilFull(shortcuts, mMaxShortcuts, promoted);
46        // Add suggestions
47        CorpusResult corpusResult = suggestions.getCorpusResult(mCorpus);
48        promoteUntilFull(corpusResult, maxPromoted, promoted);
49    }
50
51    private void promoteUntilFull(SuggestionCursor c, int maxSize, ListSuggestionCursor promoted) {
52        if (c == null) return;
53        int count = c.getCount();
54        for (int i = 0; i < count && promoted.getCount() < maxSize; i++) {
55            c.moveTo(i);
56            if (accept(c)) {
57                promoted.add(new SuggestionPosition(c, i));
58            }
59        }
60    }
61
62    protected boolean accept(Suggestion s) {
63        return mAllowedSources.contains(s.getSuggestionSource().getName());
64    }
65
66}
67