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/*
* Copyright (C) 2015 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.launcher3.allapps;
import android.os.Handler;
import com.android.launcher3.AppInfo;
import com.android.launcher3.util.ComponentKey;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
/**
* The default search implementation.
*/
public class DefaultAppSearchAlgorithm {
private static final Pattern SPLIT_PATTERN = Pattern.compile("[\\s|\\p{javaSpaceChar}]+");
private final List<AppInfo> mApps;
protected final Handler mResultHandler;
public DefaultAppSearchAlgorithm(List<AppInfo> apps) {
mApps = apps;
mResultHandler = new Handler();
}
public void cancel(boolean interruptActiveRequests) {
if (interruptActiveRequests) {
mResultHandler.removeCallbacksAndMessages(null);
}
}
public void doSearch(final String query,
final AllAppsSearchBarController.Callbacks callback) {
final ArrayList<ComponentKey> result = getTitleMatchResult(query);
mResultHandler.post(new Runnable() {
@Override
public void run() {
callback.onSearchResult(query, result);
}
});
}
protected ArrayList<ComponentKey> getTitleMatchResult(String query) {
// Do an intersection of the words in the query and each title, and filter out all the
// apps that don't match all of the words in the query.
final String queryTextLower = query.toLowerCase();
final String[] queryWords = SPLIT_PATTERN.split(queryTextLower);
final ArrayList<ComponentKey> result = new ArrayList<>();
for (AppInfo info : mApps) {
if (matches(info, queryWords)) {
result.add(info.toComponentKey());
}
}
return result;
}
protected boolean matches(AppInfo info, String[] queryWords) {
String title = info.title.toString();
String[] words = SPLIT_PATTERN.split(title.toLowerCase());
for (int qi = 0; qi < queryWords.length; qi++) {
boolean foundMatch = false;
for (int i = 0; i < words.length; i++) {
if (words[i].startsWith(queryWords[qi])) {
foundMatch = true;
break;
}
}
if (!foundMatch) {
// If there is a word in the query that does not match any words in this
// title, so skip it.
return false;
}
}
return true;
}
}
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