android.database
Class AbstractCursor

java.lang.Object
  android.database.AbstractCursor

All Implemented Interfaces:

CrossProcessCursor, Cursor

Direct Known Subclasses:

AbstractWindowedCursor, MatrixCursor, MergeCursor

public abstract class AbstractCursor
extends Object
implements CrossProcessCursor

This is an abstract cursor class that handles a lot of the common code that all cursors need to deal with and is provided for convenience reasons.

Nested Class Summary

protected static class

AbstractCursor.SelfContentObserver Cursors use this class to track changes others make to their URI.

Field Summary

protected boolean	mClosed
(package private) ContentObservable	mContentObservable
protected ContentResolver	mContentResolver
protected Long	mCurrentRowID
(package private) DataSetObservable	mDataSetObservable
protected int	mPos
protected int	mRowIdColumnIndex This must be set to the index of the row ID column by any subclass that wishes to support updates.
protected HashMap<Long,Map<String,Object>>	mUpdatedRows This HashMap contains a mapping from Long rowIDs to another Map that maps from String column names to new values.

Constructor Summary

AbstractCursor()

Method Summary

void	abortUpdates() Deprecated.
protected void	checkPosition() This function throws CursorIndexOutOfBoundsException if the cursor position is out of bounds.
void	close() Closes the Cursor, releasing all of its resources and making it completely invalid.
boolean	commitUpdates() Deprecated.
boolean	commitUpdates(Map<? extends Long,? extends Map<String,Object>> values) Deprecated.
void	copyStringToBuffer(int columnIndex, CharArrayBuffer buffer) Retrieves the requested column text and stores it in the buffer provided.
void	deactivate() Deactivates the Cursor, making all calls on it fail until Cursor.requery() is called.
void	deactivateInternal()
boolean	deleteRow() Deprecated.
void	fillWindow(int position, CursorWindow window) Copy data from cursor to CursorWindow
protected void	finalize() Called by the virtual machine when there are no longer any (non-weak) references to the receiver.
byte[]	getBlob(int column) Returns the value of the requested column as a byte array.
int	getColumnCount() Return total number of columns
int	getColumnIndex(String columnName) Returns the zero-based index for the given column name, or -1 if the column doesn't exist.
int	getColumnIndexOrThrow(String columnName) Returns the zero-based index for the given column name, or throws IllegalArgumentException if the column doesn't exist.
String	getColumnName(int columnIndex) Returns the column name at the given zero-based column index.
abstract String[]	getColumnNames() Returns a string array holding the names of all of the columns in the result set in the order in which they were listed in the result.
abstract int	getCount() Returns the numbers of rows in the cursor.
abstract double	getDouble(int column) Returns the value of the requested column as a double.
Bundle	getExtras() Returns a bundle of extra values.
abstract float	getFloat(int column) Returns the value of the requested column as a float.
abstract int	getInt(int column) Returns the value of the requested column as an int.
abstract long	getLong(int column) Returns the value of the requested column as a long.
int	getPosition() Returns the current position of the cursor in the row set.
abstract short	getShort(int column) Returns the value of the requested column as a short.
abstract String	getString(int column) Returns the value of the requested column as a String.
protected Object	getUpdatedField(int columnIndex) This function returns the uncommitted updated value for the field at columnIndex.
boolean	getWantsAllOnMoveCalls() onMove() will only be called across processes if this method returns true.
CursorWindow	getWindow() returns a pre-filled window, return NULL if no such window
boolean	hasUpdates() Deprecated.
boolean	isAfterLast() Returns whether the cursor is pointing to the position after the last row.
boolean	isBeforeFirst() Returns whether the cursor is pointing to the position before the first row.
boolean	isClosed() return true if the cursor is closed
protected boolean	isFieldUpdated(int columnIndex) This function returns true if the field has been updated and is used in conjunction with getUpdatedField(int) to allow subclasses to support reading uncommitted updates.
boolean	isFirst() Returns whether the cursor is pointing to the first row.
boolean	isLast() Returns whether the cursor is pointing to the last row.
abstract boolean	isNull(int column) Returns true if the value in the indicated column is null.
boolean	move(int offset) Move the cursor by a relative amount, forward or backward, from the current position.
boolean	moveToFirst() Move the cursor to the first row.
boolean	moveToLast() Move the cursor to the last row.
boolean	moveToNext() Move the cursor to the next row.
boolean	moveToPosition(int position) Move the cursor to an absolute position.
boolean	moveToPrevious() Move the cursor to the previous row.
protected void	onChange(boolean selfChange) Subclasses must call this method when they finish committing updates to notify all observers.
boolean	onMove(int oldPosition, int newPosition) This function is called every time the cursor is successfully scrolled to a new position, giving the subclass a chance to update any state it may have.
void	registerContentObserver(ContentObserver observer) Register an observer that is called when changes happen to the content backing this cursor.
void	registerDataSetObserver(DataSetObserver observer) Register an observer that is called when changes happen to the contents of the this cursors data set, for example, when the data set is changed via Cursor.requery(), Cursor.deactivate(), or Cursor.close().
boolean	requery() Performs the query that created the cursor again, refreshing its contents.
Bundle	respond(Bundle extras) This is an out-of-band way for the the user of a cursor to communicate with the cursor.
void	setNotificationUri(ContentResolver cr, Uri notifyUri) Specifies a content URI to watch for changes.
boolean	supportsUpdates() Deprecated.
void	unregisterContentObserver(ContentObserver observer) Unregister an observer that has previously been registered with this cursor via Cursor.registerContentObserver(android.database.ContentObserver).
void	unregisterDataSetObserver(DataSetObserver observer) Unregister an observer that has previously been registered with this cursor via Cursor.registerContentObserver(android.database.ContentObserver).
boolean	update(int columnIndex, Object obj) Deprecated.
boolean	updateBlob(int columnIndex, byte[] value) Deprecated.
boolean	updateDouble(int columnIndex, double value) Deprecated.
boolean	updateFloat(int columnIndex, float value) Deprecated.
boolean	updateInt(int columnIndex, int value) Deprecated.
boolean	updateLong(int columnIndex, long value) Deprecated.
boolean	updateShort(int columnIndex, short value) Deprecated.
boolean	updateString(int columnIndex, String value) Deprecated.
boolean	updateToNull(int columnIndex) Deprecated.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

mDataSetObservable

DataSetObservable mDataSetObservable

mContentObservable

ContentObservable mContentObservable

mUpdatedRows

protected HashMap<Long,Map<String,Object>> mUpdatedRows

This HashMap contains a mapping from Long rowIDs to another Map that maps from String column names to new values. A NULL value means to remove an existing value, and all numeric values are in their class forms, i.e. Integer, Long, Float, etc.

mRowIdColumnIndex

protected int mRowIdColumnIndex

This must be set to the index of the row ID column by any subclass that wishes to support updates.

mPos

protected int mPos

mCurrentRowID

protected Long mCurrentRowID

mContentResolver

protected ContentResolver mContentResolver

mClosed

protected boolean mClosed

Constructor Detail

AbstractCursor

public AbstractCursor()

Method Detail

getCount

public abstract int getCount()

Description copied from interface: Cursor

Returns the numbers of rows in the cursor.

Specified by:

getCount in interface Cursor

Returns:

the number of rows in the cursor.

getColumnNames

public abstract String[] getColumnNames()

Description copied from interface: Cursor

Returns a string array holding the names of all of the columns in the result set in the order in which they were listed in the result.

Specified by:

getColumnNames in interface Cursor

Returns:

the names of the columns returned in this query.

getString

public abstract String getString(int column)

Description copied from interface: Cursor

Returns the value of the requested column as a String.

If the native content of that column is not text the result will be the result of passing the column value to String.valueOf(x).

Specified by:

getString in interface Cursor

Parameters:

column - the zero-based index of the target column.

Returns:

the value of that column as a String.

getShort

public abstract short getShort(int column)

Description copied from interface: Cursor

Returns the value of the requested column as a short.

If the native content of that column is not numeric the result will be the result of passing the column value to Short.valueOf(x).

Specified by:

getShort in interface Cursor

Parameters:

column - the zero-based index of the target column.

Returns:

the value of that column as a short.

getInt

public abstract int getInt(int column)

Description copied from interface: Cursor

Returns the value of the requested column as an int.

If the native content of that column is not numeric the result will be the result of passing the column value to Integer.valueOf(x).

Specified by:

getInt in interface Cursor

Parameters:

column - the zero-based index of the target column.

Returns:

the value of that column as an int.

getLong

public abstract long getLong(int column)

Description copied from interface: Cursor

Returns the value of the requested column as a long.

If the native content of that column is not numeric the result will be the result of passing the column value to Long.valueOf(x).

Specified by:

getLong in interface Cursor

Parameters:

column - the zero-based index of the target column.

Returns:

the value of that column as a long.

getFloat

public abstract float getFloat(int column)

Description copied from interface: Cursor

Returns the value of the requested column as a float.

If the native content of that column is not numeric the result will be the result of passing the column value to Float.valueOf(x).

Specified by:

getFloat in interface Cursor

Parameters:

column - the zero-based index of the target column.

Returns:

the value of that column as a float.

getDouble

public abstract double getDouble(int column)

Description copied from interface: Cursor

Returns the value of the requested column as a double.

If the native content of that column is not numeric the result will be the result of passing the column value to Double.valueOf(x).

Specified by:

getDouble in interface Cursor

Parameters:

column - the zero-based index of the target column.

Returns:

the value of that column as a double.

isNull

public abstract boolean isNull(int column)

Description copied from interface: Cursor

Returns true if the value in the indicated column is null.

Specified by:

isNull in interface Cursor

Parameters:

column - the zero-based index of the target column.

Returns:

whether the column value is null.

getBlob

public byte[] getBlob(int column)

Description copied from interface: Cursor

Returns the value of the requested column as a byte array.

If the native content of that column is not blob exception may throw

Specified by:

getBlob in interface Cursor

Parameters:

column - the zero-based index of the target column.

Returns:

the value of that column as a byte array.

getWindow

public CursorWindow getWindow()

returns a pre-filled window, return NULL if no such window

Specified by:

getWindow in interface CrossProcessCursor

getColumnCount

public int getColumnCount()

Description copied from interface: Cursor

Return total number of columns

Specified by:

getColumnCount in interface Cursor

Returns:

number of columns

deactivate

public void deactivate()

Description copied from interface: Cursor

Deactivates the Cursor, making all calls on it fail until Cursor.requery() is called. Inactive Cursors use fewer resources than active Cursors. Calling Cursor.requery() will make the cursor active again.

Specified by:

deactivate in interface Cursor

deactivateInternal

public void deactivateInternal()

requery

public boolean requery()

Description copied from interface: Cursor

Performs the query that created the cursor again, refreshing its contents. This may be done at any time, including after a call to Cursor.deactivate().

Specified by:

requery in interface Cursor

Returns:

true if the requery succeeded, false if not, in which case the cursor becomes invalid.

isClosed

public boolean isClosed()

Description copied from interface: Cursor

return true if the cursor is closed

Specified by:

isClosed in interface Cursor

Returns:

true if the cursor is closed.

close

public void close()

Description copied from interface: Cursor

Closes the Cursor, releasing all of its resources and making it completely invalid. Unlike Cursor.deactivate() a call to Cursor.requery() will not make the Cursor valid again.

Specified by:

close in interface Cursor

commitUpdates

public boolean commitUpdates(Map<? extends Long,? extends Map<String,Object>> values)

Deprecated.

Description copied from interface: Cursor

Atomically commits all updates to the backing store, as well as the updates included in values. After completion, this method leaves the data in an inconsistent state and you should call Cursor.requery() before reading data from the cursor again.

Specified by:

commitUpdates in interface Cursor

Parameters:

values - A map from row IDs to Maps associating column names with updated values. A null value indicates the field should be removed.

Returns:

whether the operation succeeded.

deleteRow

public boolean deleteRow()

Deprecated.

Description copied from interface: Cursor

Removes the row at the current cursor position from the underlying data store. After this method returns the cursor will be pointing to the row after the row that is deleted. This has the side effect of decrementing the result of count() by one.

The query must have the row ID column in its selection, otherwise this call will fail.

Specified by:

deleteRow in interface Cursor

Returns:

whether the record was successfully deleted.

onMove

public boolean onMove(int oldPosition,
                      int newPosition)

This function is called every time the cursor is successfully scrolled to a new position, giving the subclass a chance to update any state it may have. If it returns false the move function will also do so and the cursor will scroll to the beforeFirst position.

Specified by:

onMove in interface CrossProcessCursor

Parameters:

oldPosition - the position that we're moving from

newPosition - the position that we're moving to

Returns:

true if the move is successful, false otherwise

copyStringToBuffer

public void copyStringToBuffer(int columnIndex,
                               CharArrayBuffer buffer)

Description copied from interface: Cursor

Retrieves the requested column text and stores it in the buffer provided. If the buffer size is not sufficient, a new char buffer will be allocated and assigned to CharArrayBuffer.data

Specified by:

copyStringToBuffer in interface Cursor

Parameters:

columnIndex - the zero-based index of the target column. if the target column is null, return buffer

buffer - the buffer to copy the text into.

getPosition

public final int getPosition()

Description copied from interface: Cursor

Returns the current position of the cursor in the row set. The value is zero-based. When the row set is first returned the cursor will be at positon -1, which is before the first row. After the last row is returned another call to next() will leave the cursor past the last entry, at a position of count().

Specified by:

getPosition in interface Cursor

Returns:

the current cursor position.

moveToPosition

public final boolean moveToPosition(int position)

Description copied from interface: Cursor

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.

Specified by:

moveToPosition in interface Cursor

Parameters:

position - the zero-based position to move to.

Returns:

whether the requested move fully succeeded.

fillWindow

public void fillWindow(int position,
                       CursorWindow window)

Copy data from cursor to CursorWindow

Specified by:

fillWindow in interface CrossProcessCursor

Parameters:

position - start position of data

window -

move

public final boolean move(int offset)

Description copied from interface: Cursor

Move the cursor by a relative amount, forward or backward, from the current position. Positive offsets move forwards, negative offsets move backwards. If the final position is outside of the bounds of the result set then the resultant position will be pinned to -1 or count() depending on whether the value is off the front or end of the set, respectively.

This method will return true if the requested destination was reachable, otherwise, it returns false. For example, if the cursor is at currently on the second entry in the result set and move(-5) is called, the position will be pinned at -1, and false will be returned.

Specified by:

move in interface Cursor

Parameters:

offset - the offset to be applied from the current position.

Returns:

whether the requested move fully succeeded.

moveToFirst

public final boolean moveToFirst()

Description copied from interface: Cursor

Move the cursor to the first row.

This method will return false if the cursor is empty.

Specified by:

moveToFirst in interface Cursor

Returns:

whether the move succeeded.

moveToLast

public final boolean moveToLast()

Description copied from interface: Cursor

Move the cursor to the last row.

This method will return false if the cursor is empty.

Specified by:

moveToLast in interface Cursor

Returns:

whether the move succeeded.

moveToNext

public final boolean moveToNext()

Description copied from interface: Cursor

Move the cursor to the next row.

This method will return false if the cursor is already past the last entry in the result set.

Specified by:

moveToNext in interface Cursor

Returns:

whether the move succeeded.

moveToPrevious

public final boolean moveToPrevious()

Description copied from interface: Cursor

Move the cursor to the previous row.

This method will return false if the cursor is already before the first entry in the result set.

Specified by:

moveToPrevious in interface Cursor

Returns:

whether the move succeeded.

isFirst

public final boolean isFirst()

Description copied from interface: Cursor

Returns whether the cursor is pointing to the first row.

Specified by:

isFirst in interface Cursor

Returns:

whether the cursor is pointing at the first entry.

isLast

public final boolean isLast()

Description copied from interface: Cursor

Returns whether the cursor is pointing to the last row.

Specified by:

isLast in interface Cursor

Returns:

whether the cursor is pointing at the last entry.

isBeforeFirst

public final boolean isBeforeFirst()

Description copied from interface: Cursor

Returns whether the cursor is pointing to the position before the first row.

Specified by:

isBeforeFirst in interface Cursor

Returns:

whether the cursor is before the first result.

isAfterLast

public final boolean isAfterLast()

Description copied from interface: Cursor

Returns whether the cursor is pointing to the position after the last row.

Specified by:

isAfterLast in interface Cursor

Returns:

whether the cursor is after the last result.

getColumnIndex

public int getColumnIndex(String columnName)

Description copied from interface: Cursor

Returns the zero-based index for the given column name, or -1 if the column doesn't exist. If you expect the column to exist use Cursor.getColumnIndexOrThrow(String) instead, which will make the error more clear.

Specified by:

getColumnIndex in interface Cursor

Parameters:

columnName - the name of the target column.

Returns:

the zero-based column index for the given column name, or -1 if the column name does not exist.

See Also:

Cursor.getColumnIndexOrThrow(String)

getColumnIndexOrThrow

public int getColumnIndexOrThrow(String columnName)

Description copied from interface: Cursor

Returns the zero-based index for the given column name, or throws IllegalArgumentException if the column doesn't exist. If you're not sure if a column will exist or not use Cursor.getColumnIndex(String) and check for -1, which is more efficient than catching the exceptions.

Specified by:

getColumnIndexOrThrow in interface Cursor

Parameters:

columnName - the name of the target column.

Returns:

the zero-based column index for the given column name

See Also:

Cursor.getColumnIndex(String)

getColumnName

public String getColumnName(int columnIndex)

Description copied from interface: Cursor

Returns the column name at the given zero-based column index.

Specified by:

getColumnName in interface Cursor

Parameters:

columnIndex - the zero-based index of the target column.

Returns:

the column name for the given column index.

updateBlob

public boolean updateBlob(int columnIndex,
                          byte[] value)

Deprecated.

Description copied from interface: Cursor

Updates the value for the given column in the row the cursor is currently pointing at. Updates are not committed to the backing store until Cursor.commitUpdates() is called.

Specified by:

updateBlob in interface Cursor

Parameters:

columnIndex - the zero-based index of the target column.

value - the new value.

Returns:

whether the operation succeeded.

updateString

public boolean updateString(int columnIndex,
                            String value)

Deprecated.

Description copied from interface: Cursor

Updates the value for the given column in the row the cursor is currently pointing at. Updates are not committed to the backing store until Cursor.commitUpdates() is called.

Specified by:

updateString in interface Cursor

Parameters:

columnIndex - the zero-based index of the target column.

value - the new value.

Returns:

whether the operation succeeded.

updateShort

public boolean updateShort(int columnIndex,
                           short value)

Deprecated.

Description copied from interface: Cursor

Updates the value for the given column in the row the cursor is currently pointing at. Updates are not committed to the backing store until Cursor.commitUpdates() is called.

Specified by:

updateShort in interface Cursor

Parameters:

columnIndex - the zero-based index of the target column.

value - the new value.

Returns:

whether the operation succeeded.

updateInt

public boolean updateInt(int columnIndex,
                         int value)

Deprecated.

Description copied from interface: Cursor

Updates the value for the given column in the row the cursor is currently pointing at. Updates are not committed to the backing store until Cursor.commitUpdates() is called.

Specified by:

updateInt in interface Cursor

Parameters:

columnIndex - the zero-based index of the target column.

value - the new value.

Returns:

whether the operation succeeded.

updateLong

public boolean updateLong(int columnIndex,
                          long value)

Deprecated.

Description copied from interface: Cursor

Updates the value for the given column in the row the cursor is currently pointing at. Updates are not committed to the backing store until Cursor.commitUpdates() is called.

Specified by:

updateLong in interface Cursor

Parameters:

columnIndex - the zero-based index of the target column.

value - the new value.

Returns:

whether the operation succeeded.

updateFloat

public boolean updateFloat(int columnIndex,
                           float value)

Deprecated.

Description copied from interface: Cursor

Updates the value for the given column in the row the cursor is currently pointing at. Updates are not committed to the backing store until Cursor.commitUpdates() is called.

Specified by:

updateFloat in interface Cursor

Parameters:

columnIndex - the zero-based index of the target column.

value - the new value.

Returns:

whether the operation succeeded.

updateDouble

public boolean updateDouble(int columnIndex,
                            double value)

Deprecated.

Description copied from interface: Cursor

Updates the value for the given column in the row the cursor is currently pointing at. Updates are not committed to the backing store until Cursor.commitUpdates() is called.

Specified by:

updateDouble in interface Cursor

Parameters:

columnIndex - the zero-based index of the target column.

value - the new value.

Returns:

whether the operation succeeded.

updateToNull

public boolean updateToNull(int columnIndex)

Deprecated.

Description copied from interface: Cursor

Removes the value for the given column in the row the cursor is currently pointing at. Updates are not committed to the backing store until Cursor.commitUpdates() is called.

Specified by:

updateToNull in interface Cursor

Parameters:

columnIndex - the zero-based index of the target column.

Returns:

whether the operation succeeded.

update

public boolean update(int columnIndex,
                      Object obj)

Deprecated.

hasUpdates

public boolean hasUpdates()

Deprecated.

Returns true if there are pending updates that have not yet been committed.

Specified by:

hasUpdates in interface Cursor

Returns:

true if there are pending updates that have not yet been committed.

abortUpdates

public void abortUpdates()

Deprecated.

Description copied from interface: Cursor

Reverts all updates made to the cursor since the last call to commitUpdates.

Specified by:

abortUpdates in interface Cursor

commitUpdates

public boolean commitUpdates()

Deprecated.

Description copied from interface: Cursor

Atomically commits all updates to the backing store. After completion, this method leaves the data in an inconsistent state and you should call Cursor.requery() before reading data from the cursor again.

Specified by:

commitUpdates in interface Cursor

Returns:

whether the operation succeeded.

supportsUpdates

public boolean supportsUpdates()

Deprecated.

Description copied from interface: Cursor

Returns true if the cursor supports updates.

Specified by:

supportsUpdates in interface Cursor

Returns:

whether the cursor supports updates.

registerContentObserver

public void registerContentObserver(ContentObserver observer)

Description copied from interface: Cursor

Register an observer that is called when changes happen to the content backing this cursor. Typically the data set won't change until Cursor.requery() is called.

Specified by:

registerContentObserver in interface Cursor

Parameters:

observer - the object that gets notified when the content backing the cursor changes.

See Also:

Cursor.unregisterContentObserver(ContentObserver)

unregisterContentObserver

public void unregisterContentObserver(ContentObserver observer)

Description copied from interface: Cursor

Unregister an observer that has previously been registered with this cursor via Cursor.registerContentObserver(android.database.ContentObserver).

Specified by:

unregisterContentObserver in interface Cursor

Parameters:

observer - the object to unregister.

See Also:

Cursor.registerContentObserver(ContentObserver)

registerDataSetObserver

public void registerDataSetObserver(DataSetObserver observer)

Description copied from interface: Cursor

Register an observer that is called when changes happen to the contents of the this cursors data set, for example, when the data set is changed via Cursor.requery(), Cursor.deactivate(), or Cursor.close().

Specified by:

registerDataSetObserver in interface Cursor

Parameters:

observer - the object that gets notified when the cursors data set changes.

See Also:

Cursor.unregisterDataSetObserver(DataSetObserver)

unregisterDataSetObserver

public void unregisterDataSetObserver(DataSetObserver observer)

Description copied from interface: Cursor

Unregister an observer that has previously been registered with this cursor via Cursor.registerContentObserver(android.database.ContentObserver).

Specified by:

unregisterDataSetObserver in interface Cursor

Parameters:

observer - the object to unregister.

See Also:

Cursor.registerDataSetObserver(DataSetObserver)

onChange

protected void onChange(boolean selfChange)

Subclasses must call this method when they finish committing updates to notify all observers.

Parameters:

selfChange -

setNotificationUri

public void setNotificationUri(ContentResolver cr,
                               Uri notifyUri)

Specifies a content URI to watch for changes.

Specified by:

setNotificationUri in interface Cursor

Parameters:

cr - The content resolver from the caller's context.

notifyUri - The URI to watch for changes. This can be a specific row URI, or a base URI for a whole class of content.

getWantsAllOnMoveCalls

public boolean getWantsAllOnMoveCalls()

Description copied from interface: Cursor

onMove() will only be called across processes if this method returns true.

Specified by:

getWantsAllOnMoveCalls in interface Cursor

Returns:

whether all cursor movement should result in a call to onMove().

getExtras

public Bundle getExtras()

Description copied from interface: Cursor

Returns a bundle of extra values. This is an optional way for cursors to provide out-of-band metadata to their users. One use of this is for reporting on the progress of network requests that are required to fetch data for the cursor.

These values may only change when requery is called.

Specified by:

getExtras in interface Cursor

Returns:

cursor-defined values, or Bundle.EMTPY if there are no values. Never null.

respond

public Bundle respond(Bundle extras)

Description copied from interface: Cursor

This is an out-of-band way for the the user of a cursor to communicate with the cursor. The structure of each bundle is entirely defined by the cursor.

One use of this is to tell a cursor that it should retry its network request after it reported an error.

Specified by:

respond in interface Cursor

Parameters:

extras - extra values, or Bundle.EMTPY. Never null.

Returns:

extra values, or Bundle.EMTPY. Never null.

isFieldUpdated

protected boolean isFieldUpdated(int columnIndex)

This function returns true if the field has been updated and is used in conjunction with getUpdatedField(int) to allow subclasses to support reading uncommitted updates. NOTE: This function and getUpdatedField(int) should be called together inside of a block synchronized on mUpdatedRows.

Parameters:

columnIndex - the column index of the field to check

Returns:

true if the field has been updated, false otherwise

getUpdatedField

protected Object getUpdatedField(int columnIndex)

This function returns the uncommitted updated value for the field at columnIndex. NOTE: This function and isFieldUpdated(int) should be called together inside of a block synchronized on mUpdatedRows.

Parameters:

columnIndex - the column index of the field to retrieve

Returns:

the updated value

checkPosition

protected void checkPosition()

This function throws CursorIndexOutOfBoundsException if the cursor position is out of bounds. Subclass implementations of the get functions should call this before attempting to retrieve data.

Throws:

CursorIndexOutOfBoundsException

finalize

protected void finalize()

Description copied from class: Object

Called by the virtual machine when there are no longer any (non-weak) references to the receiver. Subclasses can use this facility to guarantee that any associated resources are cleaned up before the receiver is garbage collected. Uncaught exceptions which are thrown during the running of the method cause it to terminate immediately, but are otherwise ignored.

Note: The virtual machine assumes that the implementation in class Object is empty.

Overrides:

finalize in class Object