gecko/mobile/android/base/db/DBUtils.java
2013-02-26 21:50:25 -08:00

85 lines
2.9 KiB
Java

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.db;
import org.mozilla.gecko.GeckoAppShell;
import android.content.ContentValues;
import android.database.sqlite.SQLiteOpenHelper;
import android.text.TextUtils;
import android.util.Log;
public class DBUtils {
private static final String LOGTAG = "GeckoDBUtils";
public static final String qualifyColumn(String table, String column) {
return table + "." + column;
}
// This is available in Android >= 11. Implemented locally to be
// compatible with older versions.
public static String concatenateWhere(String a, String b) {
if (TextUtils.isEmpty(a)) {
return b;
}
if (TextUtils.isEmpty(b)) {
return a;
}
return "(" + a + ") AND (" + b + ")";
}
// This is available in Android >= 11. Implemented locally to be
// compatible with older versions.
public static String[] appendSelectionArgs(String[] originalValues, String[] newValues) {
if (originalValues == null || originalValues.length == 0) {
return newValues;
}
if (newValues == null || newValues.length == 0) {
return originalValues;
}
String[] result = new String[originalValues.length + newValues.length];
System.arraycopy(originalValues, 0, result, 0, originalValues.length);
System.arraycopy(newValues, 0, result, originalValues.length, newValues.length);
return result;
}
public static void replaceKey(ContentValues aValues, String aOriginalKey,
String aNewKey, String aDefault) {
String value = aDefault;
if (aOriginalKey != null && aValues.containsKey(aOriginalKey)) {
value = aValues.get(aOriginalKey).toString();
aValues.remove(aOriginalKey);
}
if (!aValues.containsKey(aNewKey)) {
aValues.put(aNewKey, value);
}
}
public static void ensureDatabaseIsNotLocked(SQLiteOpenHelper dbHelper, String databasePath) {
for (int retries = 0; retries < 5; retries++) {
try {
// Try a simple test and exit the loop
dbHelper.getWritableDatabase();
return;
} catch (Exception e) {
// Things could get very bad if we don't find a way to unlock the DB
Log.d(LOGTAG, "Database is locked, trying to kill any zombie processes: " + databasePath);
GeckoAppShell.killAnyZombies();
try {
Thread.sleep(retries * 100);
} catch (InterruptedException ie) { }
}
}
Log.d(LOGTAG, "Failed to unlock database");
GeckoAppShell.listOfOpenFiles();
}
}