org.modeshape.graph.query
Interface QueryResults.Cursor

All Known Implementing Classes:

QueryResults.TupleCursor

Enclosing interface:

QueryResults

public static interface QueryResults.Cursor

An interface used to walk through the results.

Method Summary

Location	getLocation(int columnNumber) Get from the current row the location of the node from which the value in the given column was taken.
Location	getLocation(String selectorName) Get from the current row the location of the node that was produced by the named selector.
int	getRowIndex() Get the 0-based index of the current row.
Object	getValue(int columnNumber) Get from the current row the value in the given column.
Object	getValue(String columnName) Get the value in the named column.
boolean	hasNext() Determine whether this cursor can be moved from its current position to the next row.
void	next() Move this cursor position to the next row. obtained for

Method Detail

hasNext

boolean hasNext()

Determine whether this cursor can be moved from its current position to the next row.

Returns:

true if there is another row, or false otherwise

next

void next()

Move this cursor position to the next row. obtained for

Throws:

NoSuchElementException - if there is no next row that the cursor can point to.

getRowIndex

int getRowIndex()

Get the 0-based index of the current row.

Returns:

the index of the current row; never negative

Throws:

IllegalStateException - if the next() method has not yet been called

getLocation

Location getLocation(int columnNumber)

Get from the current row the location of the node from which the value in the given column was taken.

Parameters:

columnNumber - the column number (0-based)

Returns:

the location of the node; never null

Throws:

IndexOutOfBoundsException - if the column number is negative or larger than the number of columns

IllegalStateException - if the next() method has not yet been called, or if there are no results

getLocation

Location getLocation(String selectorName)

Get from the current row the location of the node that was produced by the named selector.

Parameters:

selectorName - the name of the selector that resulted in a node appearing in the current row

Returns:

the location of the node; or null if there is no node corresponding to the named selector for the current row

Throws:

NoSuchElementException - if the selector name does not correspond to an available selector

IllegalStateException - if the next() method has not yet been called, or if there are no results

getValue

Object getValue(int columnNumber)

Get from the current row the value in the given column.

Parameters:

columnNumber - the column number (0-based)

Returns:

the value; possibly null

Throws:

IndexOutOfBoundsException - if the column number is negative or larger than the number of columns

IllegalStateException - if the next() method has not yet been called, or if there are no results

getValue

Object getValue(String columnName)

Get the value in the named column.

Parameters:

columnName - the name of the column

Returns:

the value; possibly null

Throws:

NoSuchElementException - if the column name does not correspond to an available column

IllegalStateException - if the next() method has not yet been called, or if there are no results