/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.quicksearchbox;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.HashMultiset;
/**
* A promoter limits the maximum number of shortcuts per source
* (from non-web sources) and blends results
* from multiple sources.
*/
public class ShortcutPromoter extends AbstractPromoter {
public ShortcutPromoter(Config config, Promoter next, SuggestionFilter filter) {
super(filter, next, config);
}
@Override
public void doPickPromoted(Suggestions suggestions, int maxPromoted,
ListSuggestionCursor promoted) {
promoteShortcuts(suggestions.getShortcuts(), maxPromoted, promoted);
}
@VisibleForTesting
void promoteShortcuts(SuggestionCursor shortcuts, int maxPromoted,
ListSuggestionCursor promoted) {
int shortcutCount = shortcuts == null ? 0 : shortcuts.getCount();
if (shortcutCount == 0) return;
HashMultiset<Source> sourceShortcutCounts = HashMultiset.create(shortcutCount);
for (int i = 0; i < shortcutCount && promoted.getCount() < maxPromoted; i++) {
shortcuts.moveTo(i);
Source source = shortcuts.getSuggestionSource();
if (source != null && accept(shortcuts)) {
int prevCount = sourceShortcutCounts.add(source, 1);
int maxShortcuts = source.getMaxShortcuts(getConfig());
if (prevCount < maxShortcuts) {
promoted.add(new SuggestionPosition(shortcuts));
}
}
}
}
}