planetj.database.report
Class ColumnFunction

java.lang.Object
  |
  +--planetj.database.report.ColumnFunction

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

ColumnAverage, ColumnCount, ColumnMax, ColumnMin, ColumnSum

public abstract class ColumnFunction

extends Object

implements Serializable

Represents a function that operates on a column of values in a table

See Also:

Serialized Form

Method Summary

abstract void	clear() Clears all the previously processed values from the column function
static ColumnFunction	getColumnFunction(String pToken, String pFieldName) Gets a ColumnFunction object for the specified token and field name.
String	getFieldName() Gets the field name identifying the column this ColumnFunction is operating on
String	getFunctionToken() Gets the function token for this ColumnFunction.
abstract Object	getValue() Gets the current value of the column function
void	processRow(Row pRow) Inputs a new row to the column function
abstract void	processValue(Object pValue) Inputs a new value to the column function

Methods inherited from class java.lang.Object

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

Method Detail

clear

public abstract void clear()

Clears all the previously processed values from the column function

getColumnFunction

public static ColumnFunction getColumnFunction(String pToken,
                                               String pFieldName)
                                        throws DataEngineException

Gets a ColumnFunction object for the specified token and field name.

Parameters:

pToken - A token defined in the ColumnFunctionToken class

pFieldName - A field name identifying the column on which the ColumnFunction object will operate

DataEngineException

getFieldName

public String getFieldName()

Gets the field name identifying the column this ColumnFunction is operating on

getFunctionToken

public String getFunctionToken()

Gets the function token for this ColumnFunction. The token should be a constant defined in the ColumnFunctionToken class.

getValue

public abstract Object getValue()

Gets the current value of the column function

processRow

public void processRow(Row pRow)
                throws DataEngineException

Inputs a new row to the column function

DataEngineException

processValue

public abstract void processValue(Object pValue)
                           throws DataEngineException

Inputs a new value to the column function

DataEngineException