ShortcutPromoter.java revision b83882b9efa37ec0f20a0f1c85cf5ccc93194aee
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 17package com.android.quicksearchbox; 18 19import com.google.common.annotations.VisibleForTesting; 20import com.google.common.collect.HashMultiset; 21 22/** 23 * A promoter limits the maximum number of shortcuts per source 24 * (from non-web sources) and blends results 25 * from multiple sources. 26 */ 27public class BlendingPromoter extends RankAwarePromoter { 28 29 public BlendingPromoter(Config config) { 30 super(config); 31 } 32 33 @Override 34 public void pickPromoted(Suggestions suggestions, int maxPromoted, 35 ListSuggestionCursor promoted) { 36 promoteShortcuts(suggestions.getShortcuts(), maxPromoted, promoted); 37 38 super.pickPromoted(suggestions, maxPromoted, promoted); 39 } 40 41 @VisibleForTesting 42 void promoteShortcuts(SuggestionCursor shortcuts, int maxPromoted, 43 ListSuggestionCursor promoted) { 44 int shortcutCount = shortcuts == null ? 0 : shortcuts.getCount(); 45 if (shortcutCount == 0) return; 46 int maxShortcutsPerWebSource = getConfig().getMaxShortcutsPerWebSource(); 47 int maxShortcutsPerNonWebSource = getConfig().getMaxShortcutsPerNonWebSource(); 48 HashMultiset<Source> sourceShortcutCounts = HashMultiset.create(shortcutCount); 49 for (int i = 0; i < shortcutCount && promoted.getCount() < maxPromoted; i++) { 50 shortcuts.moveTo(i); 51 Source source = shortcuts.getSuggestionSource(); 52 if (source != null && accept(shortcuts)) { 53 int prevCount = sourceShortcutCounts.add(source, 1); 54 int maxShortcuts = source.isWebSuggestionSource() 55 ? maxShortcutsPerWebSource : maxShortcutsPerNonWebSource; 56 if (prevCount < maxShortcuts) { 57 promoted.add(new SuggestionPosition(shortcuts)); 58 } 59 } 60 } 61 } 62 63} 64