The Tor Browser: mobile/android/base/db/DBUtils.java@fc2d59ddac77

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     3  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 package org.mozilla.gecko.db;

     7 import org.mozilla.gecko.GeckoAppShell;

     9 import android.content.ContentValues;

    10 import android.database.sqlite.SQLiteOpenHelper;

    11 import android.text.TextUtils;

    12 import android.util.Log;

    14 public class DBUtils {

    15     private static final String LOGTAG = "GeckoDBUtils";

    17     public static final String qualifyColumn(String table, String column) {

    18         return table + "." + column;

    19     }

    21     // This is available in Android >= 11. Implemented locally to be

    22     // compatible with older versions.

    23     public static String concatenateWhere(String a, String b) {

    24         if (TextUtils.isEmpty(a)) {

    25             return b;

    26         }

    28         if (TextUtils.isEmpty(b)) {

    29             return a;

    30         }

    32         return "(" + a + ") AND (" + b + ")";

    33     }

    35     // This is available in Android >= 11. Implemented locally to be

    36     // compatible with older versions.

    37     public static String[] appendSelectionArgs(String[] originalValues, String[] newValues) {

    38         if (originalValues == null || originalValues.length == 0) {

    39             return newValues;

    40         }

    42         if (newValues == null || newValues.length == 0) {

    43             return originalValues;

    44         }

    46         String[] result = new String[originalValues.length + newValues.length];

    47         System.arraycopy(originalValues, 0, result, 0, originalValues.length);

    48         System.arraycopy(newValues, 0, result, originalValues.length, newValues.length);

    50         return result;

    51     }

    53     public static void replaceKey(ContentValues aValues, String aOriginalKey,

    54                                   String aNewKey, String aDefault) {

    55         String value = aDefault;

    56         if (aOriginalKey != null && aValues.containsKey(aOriginalKey)) {

    57             value = aValues.get(aOriginalKey).toString();

    58             aValues.remove(aOriginalKey);

    59         }

    61         if (!aValues.containsKey(aNewKey)) {

    62             aValues.put(aNewKey, value);

    63         }

    64     }

    66     public static void ensureDatabaseIsNotLocked(SQLiteOpenHelper dbHelper, String databasePath) {

    67         for (int retries = 0; retries < 5; retries++) {

    68             try {

    69                 // Try a simple test and exit the loop

    70                 dbHelper.getWritableDatabase();

    71                 return;

    72             } catch (Exception e) {

    73                 // Things could get very bad if we don't find a way to unlock the DB

    74                 Log.d(LOGTAG, "Database is locked, trying to kill any zombie processes: " + databasePath);

    75                 GeckoAppShell.killAnyZombies();

    76                 try {

    77                     Thread.sleep(retries * 100);

    78                 } catch (InterruptedException ie) { }

    79             }

    80         }

    81         Log.d(LOGTAG, "Failed to unlock database");

    82         GeckoAppShell.listOfOpenFiles();

    83     }

    85     /**

    86      * Verifies that 0-byte arrays aren't added as favicon or thumbnail data.

    87      * @param values        ContentValues of query

    88      * @param columnName    Name of data column to verify

    89      */

    90     public static void stripEmptyByteArray(ContentValues values, String columnName) {

    91         if (values.containsKey(columnName)) {

    92             byte[] data = values.getAsByteArray(columnName);

    93             if (data == null || data.length == 0) {

    94                 Log.w(LOGTAG, "Tried to insert an empty or non-byte-array image. Ignoring.");

    95                 values.putNull(columnName);

    96             }

    97         }

    98     }

    99 }

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