org.eclipse.birt.chart.factory
Class DataRowExpressionEvaluatorAdapter

java.lang.Object
  org.eclipse.birt.chart.factory.DataRowExpressionEvaluatorAdapter

All Implemented Interfaces:

IDataRowExpressionEvaluator

public class DataRowExpressionEvaluatorAdapter
extends java.lang.Object
implements IDataRowExpressionEvaluator

An adapter class for IDataRowExpressionEvaluator

Constructor Summary

DataRowExpressionEvaluatorAdapter()

Method Summary

void	close() Closes the underlying resultset.
java.lang.Object	evaluate(java.lang.String expression) Evaluates the expression based on the current row
java.lang.Object	evaluateGlobal(java.lang.String expression) Evaluates the global expressions which are not associated with the data rows.
boolean	first() Moves to the first row.
boolean	next() Moves to the next row.

Methods inherited from class java.lang.Object

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

Constructor Detail

DataRowExpressionEvaluatorAdapter

public DataRowExpressionEvaluatorAdapter()

Method Detail

evaluate

public java.lang.Object evaluate(java.lang.String expression)

Description copied from interface: IDataRowExpressionEvaluator

Evaluates the expression based on the current row

Specified by:

evaluate in interface IDataRowExpressionEvaluator

Returns:

An Object representing the evaluated expression. The Object must be of a type String, Number, Date, Calendar, or it will be evaluated as a String using toString(). If there is any BirtException being caught by evaluation, the return value will be the caught BirtException.

evaluateGlobal

public java.lang.Object evaluateGlobal(java.lang.String expression)

Description copied from interface: IDataRowExpressionEvaluator

Evaluates the global expressions which are not associated with the data rows.

Specified by:

evaluateGlobal in interface IDataRowExpressionEvaluator

Returns:

An Object representing the evaluated expression. The Object must be of a type String, Number, Date, Calendar, or it will be evaluated as a String using toString().

first

public boolean first()

Description copied from interface: IDataRowExpressionEvaluator

Moves to the first row. Optional if already positioned on the first row when passed to Generator.bindData()

Specified by:

first in interface IDataRowExpressionEvaluator

Returns:

true if the cursor is on a valid row; false if there are no rows in the result set

next

public boolean next()

Description copied from interface: IDataRowExpressionEvaluator

Moves to the next row.

Specified by:

next in interface IDataRowExpressionEvaluator

Returns:

False if the last row has been reached. True otherwise.

close

public void close()

Description copied from interface: IDataRowExpressionEvaluator

Closes the underlying resultset. This is optional (it can be a no-op if the close is handled externally or not needed).

Specified by:

close in interface IDataRowExpressionEvaluator