Package org.eclipse.nebula.widgets.nattable.summaryrow

Class SummationSummaryProvider

java.lang.Object

org.eclipse.nebula.widgets.nattable.summaryrow.SummationSummaryProvider

All Implemented Interfaces:

ISummaryProvider

public class SummationSummaryProvider
extends Object
implements ISummaryProvider

Implementation of ISummaryProvider that summarizes all values in a column if they are of type Number and return the sum as Double value.

If a column contains mixed values, e.g. Strings and Integers, the SummationSummaryProvider will return ISummaryProvider.DEFAULT_SUMMARY_VALUE by default, as a summation is not possible this way. You are able to change that behaviour by creating the SummationSummaryProvider with the parameter strict set to false. In that case the non Number values will be ignored.

Field Summary

Fields inherited from interface org.eclipse.nebula.widgets.nattable.summaryrow.ISummaryProvider

DEFAULT, DEFAULT_SUMMARY_VALUE, NONE

Constructor Summary

Constructors

Constructor	Description
SummationSummaryProvider(IDataProvider dataProvider)	Create a new SummationSummaryProvider by using the given IDataProvider.
SummationSummaryProvider(IDataProvider dataProvider, boolean strict)	Create a new SummationSummaryProvider by using the given IDataProvider and strict mode configuration.

Method Summary

Modifier and Type	Method	Description
Object	summarize(int columnIndex)	Calculates the sum of the values in the column.

Methods inherited from class java.lang.Object

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

Constructor Details

SummationSummaryProvider

public SummationSummaryProvider(IDataProvider dataProvider)

Create a new SummationSummaryProvider by using the given IDataProvider.

Using this constructor will set the SummationSummaryProvider in strict mode which means that if a column contains non Number values, ISummaryProvider.DEFAULT_SUMMARY_VALUE will be returned.

Parameters:

dataProvider - The IDataProvider that should be used to calculate the sum.

SummationSummaryProvider

public SummationSummaryProvider(IDataProvider dataProvider,
 boolean strict)

Create a new SummationSummaryProvider by using the given IDataProvider and strict mode configuration.

Using this constructor will set the SummationSummaryProvider in strict mode which means that if a column contains non Number values, ISummaryProvider.DEFAULT_SUMMARY_VALUE will be returned.

Parameters:

dataProvider - The IDataProvider that should be used to calculate the sum.

strict - If strict is set to true and one or more of the values in the column is not of type Number, then ISummaryProvider.DEFAULT_SUMMARY_VALUE will be returned. If strict is set to false, this method will return the sum of all the values in the column that are of type Number, ignoring the non Number values.

Method Details

summarize

public Object summarize(int columnIndex)

Calculates the sum of the values in the column.

Specified by:

summarize in interface ISummaryProvider

Parameters:

columnIndex - The column index of the column for which the summary should be calculated.

Returns:

The sum of all Number values in the column as Double or ISummaryProvider.DEFAULT_SUMMARY_VALUE if the column contains non Number values and this SummationSummaryProvider is configured to be strict.