Clean up CursorWindow code.

Bug: 5332296

The code is functionally equivalent, but a little more efficient
and much easier to maintain.

Change-Id: I90670a13799df05831843a5137ab234929281b7c

Author: Jeff Brown

core/java/android/database/CursorWindow.java

@@ -18,17 +18,12 @@
 
 /**
  * This exception is thrown when a CursorWindow couldn't be allocated,
- * most probably due to memory not being available
+ * most probably due to memory not being available.
+ *
+ * @hide
  */
-class CursorWindowAllocationException extends java.lang.RuntimeException
-{
-    public CursorWindowAllocationException()
-    {
-        super();
-    }
-
-    public CursorWindowAllocationException(String description)
-    {
+public class CursorWindowAllocationException extends RuntimeException {
+    public CursorWindowAllocationException(String description) {
         super(description);
     }
 }

core/java/android/database/CursorWindowAllocationException.java

@@ -79,7 +79,7 @@ public class SQLiteQuery extends SQLiteProgram {
                 // if the start pos is not equal to 0, then most likely window is
                 // too small for the data set, loading by another thread
                 // is not safe in this situation. the native code will ignore maxRead
-                int numRows = native_fill_window(window, window.getStartPosition(),
+                int numRows = native_fill_window(window.mWindowPtr, window.getStartPosition(),
                         mOffsetIndex, maxRead, lastPos);
                 mDatabase.logTimeStat(mSql, timeStart);
                 return numRows;
@@ -154,7 +154,7 @@ public void close() {
         compileAndbindAllArgs();
     }
 
-    private final native int native_fill_window(CursorWindow window,
+    private final native int native_fill_window(int windowPtr,
             int startPos, int offsetParam, int maxRead, int lastPos);
 
     private final native int native_column_count();