DownloadCursor
@UnstableApi
public interface DownloadCursor extends Closeable
Provides random read-write access to the result set returned by a database query.
Summary
Public methods |
|
|---|---|
abstract void |
close() |
abstract int |
getCount()Returns the numbers of downloads in the cursor. |
abstract Download |
Returns the download at the current position. |
abstract int |
Returns the current position of the cursor in the download set. |
default boolean |
Returns whether the cursor is pointing to the position after the last download. |
default boolean |
Returns whether the cursor is pointing to the position before the first download. |
abstract boolean |
isClosed()Returns whether the cursor is closed |
default boolean |
isFirst()Returns whether the cursor is pointing to the first download. |
default boolean |
isLast()Returns whether the cursor is pointing to the last download. |
default boolean |
Move the cursor to the first download. |
default boolean |
Move the cursor to the last download. |
default boolean |
Move the cursor to the next download. |
abstract boolean |
moveToPosition(int position)Move the cursor to an absolute position. |
default boolean |
Move the cursor to the previous download. |
Public methods
getPosition
abstract int getPosition()
Returns the current position of the cursor in the download set. The value is zero-based. When the download set is first returned the cursor will be at position -1, which is before the first download. After the last download is returned another call to next() will leave the cursor past the last entry, at a position of count().
| Returns | |
|---|---|
int |
the current cursor position. |
isAfterLast
default boolean isAfterLast()
Returns whether the cursor is pointing to the position after the last download.
isBeforeFirst
default boolean isBeforeFirst()
Returns whether the cursor is pointing to the position before the first download.
moveToFirst
default boolean moveToFirst()
Move the cursor to the first download.
This method will return false if the cursor is empty.
| Returns | |
|---|---|
boolean |
whether the move succeeded. |
moveToLast
default boolean moveToLast()
Move the cursor to the last download.
This method will return false if the cursor is empty.
| Returns | |
|---|---|
boolean |
whether the move succeeded. |
moveToNext
default boolean moveToNext()
Move the cursor to the next download.
This method will return false if the cursor is already past the last entry in the result set.
| Returns | |
|---|---|
boolean |
whether the move succeeded. |
moveToPosition
abstract boolean moveToPosition(int position)
Move the cursor to an absolute position. The valid range of values is -1 <= position <= count.
This method will return true if the request destination was reachable, otherwise, it returns false.
| Parameters | |
|---|---|
int position |
the zero-based position to move to. |
| Returns | |
|---|---|
boolean |
whether the requested move fully succeeded. |
moveToPrevious
default boolean moveToPrevious()
Move the cursor to the previous download.
This method will return false if the cursor is already before the first entry in the result set.
| Returns | |
|---|---|
boolean |
whether the move succeeded. |