org.pentaho.reporting.engine.classic.core.states.datarow
Class PaddingDataRow

java.lang.Object
  org.pentaho.reporting.engine.classic.core.states.datarow.PaddingDataRow

public class PaddingDataRow
extends Object

A datarow that acts as padding source. It overrides the columns from either report-data or expressions datarow with values collected by the crosstab-specification. It also provides padding for the advance calls.

There are three padding scenarios that must be covered by this data-row:

• Leading columns are missing

  The crosstab-specification's current cursor position is not at the computed position for the current column key (the column values read from the actual data-row). Therefore the system has to insert fake columns until the cursor has advanced to the current position. As we are effectively duplicating rows, this may lead to corrupted data if we duplicate non-group-columns.

• Inner columns are missing

  After an advance, the computed column-key position is greater than the current cursor position. Therefore the system has to insert fake data until the positions match again.

• Trailing columns are missing

  If the advance would trigger a group-break, check whether the current cursor position is already at the end of the columns list. If not, stay on the current row and insert as many fake rows as needed.

The last two cases may be consolidated into one case.

Author:

Thomas Morgner

Constructor Summary

PaddingDataRow(CrosstabSpecification crosstabSpecification)

PaddingDataRow(PaddingDataRow dataRow)

Method Summary

void	activate(MasterDataRow dataRow)
PaddingDataRow	advance()
int	getCrosstabColumnCount()
int	getCurrentCursorPosition()
int	getPostPaddingRows(DataRow globalView) After an advance, do we have to delay the advance and insert some extra rows? If we delay, then the advance has to be undone and we have to get marked for either case2 or case3.
int	getPrePaddingRows(DataRow globalView) Do we need a case1 padding?
PaddingDataRow	resetRowCursor()

Methods inherited from class java.lang.Object

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

Constructor Detail

PaddingDataRow

public PaddingDataRow(PaddingDataRow dataRow)

PaddingDataRow

public PaddingDataRow(CrosstabSpecification crosstabSpecification)

Method Detail

getPrePaddingRows

public int getPrePaddingRows(DataRow globalView)

Do we need a case1 padding?

Parameters:

globalView -

Returns:

the number of rows needed for the pre-padding or zero if no pre-padding is required.

getCurrentCursorPosition

public int getCurrentCursorPosition()

getCrosstabColumnCount

public int getCrosstabColumnCount()

getPostPaddingRows

public int getPostPaddingRows(DataRow globalView)

After an advance, do we have to delay the advance and insert some extra rows? If we delay, then the advance has to be undone and we have to get marked for either case2 or case3.

Parameters:

globalView -

Returns:

the number of rows we have to insert for post-padding. If no padding is needed, zero is returned.

advance

public PaddingDataRow advance()

activate

public void activate(MasterDataRow dataRow)

resetRowCursor

public PaddingDataRow resetRowCursor()