Android应用源码之QuickSearchBox-IT计算机-毕业设计.zip

/* * Copyright (C) 2009 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.android.quicksearchbox.util.Consumer; import com.android.quicksearchbox.util.Consumers; import com.android.quicksearchbox.util.SQLiteAsyncQuery; import com.android.quicksearchbox.util.SQLiteTransaction; import com.android.quicksearchbox.util.Util; import com.google.common.annotations.VisibleForTesting; import org.json.JSONException; import android.app.SearchManager; import android.content.ComponentName; import android.content.ContentResolver; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.database.sqlite.SQLiteQueryBuilder; import android.net.Uri; import android.os.Handler; import android.text.TextUtils; import android.util.Log; import java.io.File; import java.util.Collection; import java.util.HashMap; import java.util.Map; import java.util.concurrent.Executor; /** * A shortcut repository implementation that uses a log of every click. * * To inspect DB: * # sqlite3 /data/data/com.android.quicksearchbox/databases/qsb-log.db * * TODO: Refactor this class. */ public class ShortcutRepositoryImplLog implements ShortcutRepository { private static final boolean DBG = false; private static final String TAG = "QSB.ShortcutRepositoryImplLog"; private static final String DB_NAME = "qsb-log.db"; private static final int DB_VERSION = 32; private static final String HAS_HISTORY_QUERY = "SELECT " + Shortcuts.intent_key.fullName + " FROM " + Shortcuts.TABLE_NAME; private String mEmptyQueryShortcutQuery ; private String mShortcutQuery; private static final String SHORTCUT_BY_ID_WHERE = Shortcuts.shortcut_id.name() + "=? AND " + Shortcuts.source.name() + "=?"; private static final String SOURCE_RANKING_SQL = buildSourceRankingSql(); private final Context mContext; private final Config mConfig; private final Corpora mCorpora; private final ShortcutRefresher mRefresher; private final Handler mUiThread; // Used to perform log write operations asynchronously private final Executor mLogExecutor; private final DbOpenHelper mOpenHelper; private final String mSearchSpinner; /** * Create an instance to the repo. */ public static ShortcutRepository create(Context context, Config config, Corpora sources, ShortcutRefresher refresher, Handler uiThread, Executor logExecutor) { return new ShortcutRepositoryImplLog(context, config, sources, refresher, uiThread, logExecutor, DB_NAME); } /** * @param context Used to create / open db * @param name The name of the database to create. */ @VisibleForTesting ShortcutRepositoryImplLog(Context context, Config config, Corpora corpora, ShortcutRefresher refresher, Handler uiThread, Executor logExecutor, String name) { mContext = context; mConfig = config; mCorpora = corpora; mRefresher = refresher; mUiThread = uiThread; mLogExecutor = logExecutor; mOpenHelper = new DbOpenHelper(context, name, DB_VERSION, config); buildShortcutQueries(); mSearchSpinner = Util.getResourceUri(mContext, R.drawable.search_spinner).toString(); } // clicklog first, since that's where restrict the result set private static final String TABLES = ClickLog.TABLE_NAME + " INNER JOIN " + Shortcuts.TABLE_NAME + " ON " + ClickLog.intent_key.fullName + " = " + Shortcuts.intent_key.fullName; private static final String AS = " AS "; private static final String[] SHORTCUT_QUERY_COLUMNS = { Shortcuts.intent_key.fullName, Shortcuts.source.fullName, Shortcuts.source_version_code.fullName, Shortcuts.format.fullName + AS + SearchManager.SUGGEST_COLUMN_FORMAT, Shortcuts.title + AS + SearchManager.SUGGEST_COLUMN_TEXT_1, Shortcuts.description + AS + SearchManager.SUGGEST_COLUMN_TEXT_2, Shortcuts.description_url + AS + SearchManager.SUGGEST_COLUMN_TEXT_2_URL, Shortcuts.icon1 + AS + SearchManager.SUGGEST_COLUMN_ICON_1, Shortcuts.icon2 + AS + SearchManager.SUGGEST_COLUMN_ICON_2, Shortcuts.intent_action + AS + SearchManager.SUGGEST_COLUMN_INTENT_ACTION, Shortcuts.intent_component.fullName, Shortcuts.intent_data + AS + SearchManager.SUGGEST_COLUMN_INTENT_DATA, Shortcuts.intent_query + AS + SearchManager.SUGGEST_COLUMN_QUERY, Shortcuts.intent_extradata + AS + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA, Shortcuts.shortcut_id + AS + SearchManager.SUGGEST_COLUMN_SHORTCUT_ID, Shortcuts.spinner_while_refreshing + AS + SearchManager.SUGGEST_COLUMN_SPINNER_WHILE_REFRESHING, Shortcuts.log_type + AS + CursorBackedSuggestionCursor.SUGGEST_COLUMN_LOG_TYPE, Shortcuts.custom_columns.fullName, }; // Avoid GLOB by using >= AND <, with some manipulation (see nextString(String)). // to figure out the upper bound (e.g. >= "abc" AND < "abd" // This allows us to use parameter binding and still take advantage of the // index on the query column. private static final String PREFIX_RESTRICTION = ClickLog.query.fullName + " >= ?1 AND " + ClickLog.query.fullName + " < ?2"; private static final String LAST_HIT_TIME_EXPR = "MAX(" + ClickLog.hit_time.fullName + ")"; private static final String GROUP_BY = ClickLog.intent_key.fullName; private static final String PREFER_LATEST_PREFIX = "(" + LAST_HIT_TIME_EXPR + " = (SELECT " + LAST_HIT_TIME_EXPR + " FROM " + ClickLog.TABLE_NAME + " WHERE "; private static final String PREFER_LATEST_SUFFIX = "))"; private void buildShortcutQueries() { // SQL expression for the time before which no clicks should be counted. String cutOffTime_expr = "(?3 - " + mConfig.getMaxStatAgeMillis() + ")"; // Filter out clicks that are too old String ageRestriction = ClickLog.hit_time.fullName + " >= " + cutOffTime_expr; String having = null; // Order by sum of hit times (seconds since cutoff) for the clicks for each shortcut. // This has the effect of multiplying the average hit time with the click count String ordering_expr = "SUM((" + ClickLog.hit_time.fullName + " - " + cutOffTime_expr + ") / 1000)"; String where = ageRestriction; String preferLatest = PREFER_LATEST_PREFIX + where + PREFER_LATEST_SUFFIX; String orderBy = preferLatest + " DESC, " + ordering_expr + " DESC"; mEmptyQueryShortcutQuery = SQLiteQueryBuilder.buildQueryString( false, TABLES, SHORTCUT_QUERY_COLUMNS, where, GROUP_BY, having, orderBy, null); if (DBG) Log.d(TAG, "Empty shortcut query:\n" + mEmptyQueryShortcutQuery); where = PREFIX_RESTRICTION + " AND " + ageRestriction; preferLatest = PREFER_LATEST_PREFIX + where + PREFER_LATEST_SUFFIX; orderBy = preferLatest + " DESC, " + ordering_expr + " DESC"; mShortcutQuery = SQLiteQueryBuilder.buildQueryString( false, TABLES, SHORTCUT_QUE