diff -r 000000000000 -r 4f2f89ce4247 WebCore/page/GeolocationPositionCache.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/page/GeolocationPositionCache.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,178 @@
+/*
+ * Copyright 2010, The Android Open Source Project
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "GeolocationPositionCache.h"
+
+#if ENABLE(GEOLOCATION)
+
+#include "Geoposition.h"
+#include "SQLValue.h"
+#include "SQLiteDatabase.h"
+#include "SQLiteFileSystem.h"
+#include "SQLiteStatement.h"
+#include "SQLiteTransaction.h"
+
+namespace WebCore {
+
+static const char* databaseName = "CachedGeoposition.db";
+
+int GeolocationPositionCache::s_instances = 0;
+RefPtr<Geoposition>* GeolocationPositionCache::s_cachedPosition;
+String* GeolocationPositionCache::s_databaseFile = 0;
+
+GeolocationPositionCache::GeolocationPositionCache()
+{
+    if (!(s_instances++)) {
+        s_cachedPosition = new RefPtr<Geoposition>;
+        *s_cachedPosition = readFromDB();
+    }
+}
+
+GeolocationPositionCache::~GeolocationPositionCache()
+{
+    if (!(--s_instances)) {
+        if (*s_cachedPosition)
+            writeToDB(s_cachedPosition->get());
+        delete s_cachedPosition;
+    }
+}
+
+void GeolocationPositionCache::setCachedPosition(Geoposition* cachedPosition)
+{
+    *s_cachedPosition = cachedPosition;
+}
+
+Geoposition* GeolocationPositionCache::cachedPosition()
+{
+    return s_cachedPosition->get();
+}
+
+void GeolocationPositionCache::setDatabasePath(const String& databasePath)
+{
+    if (!s_databaseFile)
+        s_databaseFile = new String;
+    *s_databaseFile = SQLiteFileSystem::appendDatabaseFileNameToPath(databasePath, databaseName);
+    // If we don't have have a cached position, attempt to read one from the
+    // DB at the new path.
+    if (s_instances && !(*s_cachedPosition))
+        *s_cachedPosition = readFromDB();
+}
+
+PassRefPtr<Geoposition> GeolocationPositionCache::readFromDB()
+{
+    SQLiteDatabase database;
+    if (!s_databaseFile || !database.open(*s_databaseFile))
+        return 0;
+
+    // Create the table here, such that even if we've just created the
+    // DB, the commands below should succeed.
+    if (!database.executeCommand("CREATE TABLE IF NOT EXISTS CachedPosition ("
+            "latitude REAL NOT NULL, "
+            "longitude REAL NOT NULL, "
+            "altitude REAL, "
+            "accuracy REAL NOT NULL, "
+            "altitudeAccuracy REAL, "
+            "heading REAL, "
+            "speed REAL, "
+            "timestamp INTEGER NOT NULL)"))
+        return 0;
+
+    SQLiteStatement statement(database, "SELECT * FROM CachedPosition");
+    if (statement.prepare() != SQLResultOk)
+        return 0;
+
+    if (statement.step() != SQLResultRow)
+        return 0;
+
+    bool providesAltitude = statement.getColumnValue(2).type() != SQLValue::NullValue;
+    bool providesAltitudeAccuracy = statement.getColumnValue(4).type() != SQLValue::NullValue;
+    bool providesHeading = statement.getColumnValue(5).type() != SQLValue::NullValue;
+    bool providesSpeed = statement.getColumnValue(6).type() != SQLValue::NullValue;
+    RefPtr<Coordinates> coordinates = Coordinates::create(statement.getColumnDouble(0), // latitude
+                                                          statement.getColumnDouble(1), // longitude
+                                                          providesAltitude, statement.getColumnDouble(2), // altitude
+                                                          statement.getColumnDouble(3), // accuracy
+                                                          providesAltitudeAccuracy, statement.getColumnDouble(4), // altitudeAccuracy
+                                                          providesHeading, statement.getColumnDouble(5), // heading
+                                                          providesSpeed, statement.getColumnDouble(6)); // speed
+    return Geoposition::create(coordinates.release(), statement.getColumnInt64(7)); // timestamp
+}
+
+void GeolocationPositionCache::writeToDB(const Geoposition* position)
+{
+    ASSERT(position);
+
+    SQLiteDatabase database;
+    if (!s_databaseFile || !database.open(*s_databaseFile))
+        return;
+
+    SQLiteTransaction transaction(database);
+
+    if (!database.executeCommand("DELETE FROM CachedPosition"))
+        return;
+
+    SQLiteStatement statement(database, "INSERT INTO CachedPosition ("
+        "latitude, "
+        "longitude, "
+        "altitude, "
+        "accuracy, "
+        "altitudeAccuracy, "
+        "heading, "
+        "speed, "
+        "timestamp) "
+        "VALUES (?, ?, ?, ?, ?, ?, ?, ?)");
+    if (statement.prepare() != SQLResultOk)
+        return;
+
+    statement.bindDouble(1, position->coords()->latitude());
+    statement.bindDouble(2, position->coords()->longitude());
+    if (position->coords()->canProvideAltitude())
+        statement.bindDouble(3, position->coords()->altitude());
+    else
+        statement.bindNull(3);
+    statement.bindDouble(4, position->coords()->accuracy());
+    if (position->coords()->canProvideAltitudeAccuracy())
+        statement.bindDouble(5, position->coords()->altitudeAccuracy());
+    else
+        statement.bindNull(5);
+    if (position->coords()->canProvideHeading())
+        statement.bindDouble(6, position->coords()->heading());
+    else
+        statement.bindNull(6);
+    if (position->coords()->canProvideSpeed())
+        statement.bindDouble(7, position->coords()->speed());
+    else
+        statement.bindNull(7);
+    statement.bindInt64(8, position->timestamp());
+    if (!statement.executeCommand())
+        return;
+
+    transaction.commit();
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(GEOLOCATION)