diff options
Diffstat (limited to 'src/com/android/launcher3/allapps/search/DefaultAppSearchAlgorithm.java')
-rw-r--r-- | src/com/android/launcher3/allapps/search/DefaultAppSearchAlgorithm.java | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/src/com/android/launcher3/allapps/search/DefaultAppSearchAlgorithm.java b/src/com/android/launcher3/allapps/search/DefaultAppSearchAlgorithm.java new file mode 100644 index 000000000..457b454ef --- /dev/null +++ b/src/com/android/launcher3/allapps/search/DefaultAppSearchAlgorithm.java @@ -0,0 +1,136 @@ +/* + * 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.search; + +import android.os.Handler; + +import com.android.launcher3.AppInfo; +import com.android.launcher3.util.ComponentKey; + +import java.util.ArrayList; +import java.util.List; + +/** + * The default search implementation. + */ +public class DefaultAppSearchAlgorithm { + + 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 ArrayList<ComponentKey> result = new ArrayList<>(); + for (AppInfo info : mApps) { + if (matches(info, queryTextLower)) { + result.add(info.toComponentKey()); + } + } + return result; + } + + protected boolean matches(AppInfo info, String query) { + int queryLength = query.length(); + + String title = info.title.toString(); + int titleLength = title.length(); + + if (titleLength < queryLength || queryLength <= 0) { + return false; + } + + int lastType; + int thisType = Character.UNASSIGNED; + int nextType = Character.getType(title.codePointAt(0)); + + int end = titleLength - queryLength; + for (int i = 0; i <= end; i++) { + lastType = thisType; + thisType = nextType; + nextType = i < (titleLength - 1) ? + Character.getType(title.codePointAt(i + 1)) : Character.UNASSIGNED; + if (isBreak(thisType, lastType, nextType) && + title.substring(i, i + queryLength).equalsIgnoreCase(query)) { + return true; + } + } + return false; + } + + /** + * Returns true if the current point should be a break point. Following cases + * are considered as break points: + * 1) Any non space character after a space character + * 2) Any digit after a non-digit character + * 3) Any capital character after a digit or small character + * 4) Any capital character before a small character + */ + protected boolean isBreak(int thisType, int prevType, int nextType) { + switch (thisType) { + case Character.UPPERCASE_LETTER: + if (nextType == Character.UPPERCASE_LETTER) { + return true; + } + // Follow through + case Character.TITLECASE_LETTER: + // Break point if previous was not a upper case + return prevType != Character.UPPERCASE_LETTER; + case Character.LOWERCASE_LETTER: + // Break point if previous was not a letter. + return prevType > Character.OTHER_LETTER || prevType <= Character.UNASSIGNED; + case Character.DECIMAL_DIGIT_NUMBER: + case Character.LETTER_NUMBER: + case Character.OTHER_NUMBER: + // Break point if previous was not a number + return !(prevType == Character.DECIMAL_DIGIT_NUMBER + || prevType == Character.LETTER_NUMBER + || prevType == Character.OTHER_NUMBER); + case Character.MATH_SYMBOL: + case Character.CURRENCY_SYMBOL: + case Character.OTHER_PUNCTUATION: + case Character.DASH_PUNCTUATION: + // Always a break point for a symbol + return true; + default: + return false; + } + } +} |