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oracle.olapi.data.cursor
Interface CursorManager

All Known Subinterfaces:

SpecifiedCursorManager

public interface CursorManager

An interface for an object that creates and manages Cursor objects. An implementation of CursorManager has methods that create a Cursor, get or set the fetch size for the Cursor objects created by it, and get the Source associated with it.

To create a CursorManager, call the createCursorManager method of a DataProvider. An application can create more than one Cursor from the same CursorManager. Those Cursor objects share the same data cache. An application might want to create two different Cursor objects if, for example, it wants to display different views of the same data, such as a table view and a graph view.

See Also:

CursorInfoSpecification, DataProvider

Method Summary

void	addCursorManagerUpdateListener(CursorManagerUpdateListener l) Adds a CursorManagerUpdateListener to the CursorManager.
void	close() Closes the CursorManager and releases the resources associated with it.
Cursor	createCursor() Creates a Cursor for the Source associated with the CursorManager.
int	getFetchSize() Gets the fetch size for a Cursor created by this CursorManager.
Source	getSource() Gets the Source associated with this CursorManager.
boolean	isSpecificationUpdateNeeded() Indicates whether the structure has changed of the Source associated with the CursorManager.
void	removeCursorManagerUpdateListener(CursorManagerUpdateListener l) Removes a CursorManagerUpdateListener from the list of listeners for the CursorManager.
void	setFetchSize(int fetchSize) Specifies the fetch size for Cursor objects created by this CursorManager.
void	updateSpecification(CursorInfoSpecification cursorInfoSpec) Replaces the CursorInfoSpecification for this CursorManager with the specified CursorInfoSpecification.

Method Detail

close

void close()

Closes the CursorManager and releases the resources associated with it. Any Cursor objects created by the CursorManager become unusable.

createCursor

Cursor createCursor()

Creates a Cursor for the Source associated with the CursorManager.

Returns:

A Cursor.

isSpecificationUpdateNeeded

boolean isSpecificationUpdateNeeded()

Indicates whether the structure has changed of the Source associated with the CursorManager. If the structure of the Source has changed, then you need to create a new CursoInfoSpecification for the changed Source. You can use the new CursorInfoSpecification to update the specification for the existing CursorManager or use it to create a new CursorManager.

Returns:

A boolean that is true if the structure of the Source associated with the CursorManager has changed or false otherwise.

addCursorManagerUpdateListener

void addCursorManagerUpdateListener(CursorManagerUpdateListener l)

Adds a CursorManagerUpdateListener to the CursorManager.

Parameters:

l - The CursorManagerUpdateListener to add to this CursorManager.

removeCursorManagerUpdateListener

void removeCursorManagerUpdateListener(CursorManagerUpdateListener l)

Removes a CursorManagerUpdateListener from the list of listeners for the CursorManager.

Parameters:

l - The CursorManagerUpdateListener to remove from the list of listeners.

getSource

Source getSource()

Gets the Source associated with this CursorManager.

Returns:

The Source for this CursorManager.

updateSpecification

void updateSpecification(CursorInfoSpecification cursorInfoSpec)

Replaces the CursorInfoSpecification for this CursorManager with the specified CursorInfoSpecification. When you change the structure of the Source for a CursorManager, the CursorInfoSpecification becomes outdated.

To continue to use this CursorManager, you must create a new CursorInfoSpecification, and call this method and pass in the new CursorInfoSpecification. You can then create new Cursor objects the CursorManager.

Parameters:

cursorInfoSpec - The CursorInfoSpecification with which to replace the current CursorInfoSpecification for this CursorManager.

getFetchSize

int getFetchSize()

Gets the fetch size for a Cursor created by this CursorManager.

Returns:

An integer that is the fetch size for Cursor objects created by this CursorManager.

setFetchSize

void setFetchSize(int fetchSize)

Specifies the fetch size for Cursor objects created by this CursorManager.

Parameters:

fetchSize - An integer that is the fetch size you want to specify for Cursor objects created by this CursorManager.

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