weka.gui.beans

Class AbstractOffscreenChartRenderer

java.lang.Object

weka.gui.beans.AbstractOffscreenChartRenderer

All Implemented Interfaces:

OffscreenChartRenderer

Direct Known Subclasses:

WekaOffscreenChartRenderer

public abstract class AbstractOffscreenChartRenderer
extends java.lang.Object
implements OffscreenChartRenderer

Abstract base class for offscreen chart renderers. Provides a method for retrieving options and a convenience method for getting the index of an attribute given its name.

Constructor Summary

Constructors

Constructor and Description
AbstractOffscreenChartRenderer()

Method Summary

Modifier and Type	Method and Description
protected int	getIndexOfAttribute(Instances insts, java.lang.String attName) Get the index of a named attribute in a set of Instances.
protected java.lang.String	getOption(java.util.List<java.lang.String> options, java.lang.String toGet) Utility method for retrieving the value of an option from a list of options.
java.lang.String	optionsTipTextHTML() Gets a short list of additional options (if any), suitable for displaying in a tip text, in HTML form.
protected java.util.List<Instances>	splitToClasses(Instances insts, int classIndex) Utility method that splits the supplied Instances out to a list of Instances, where each Instances object contains just the instances of one nominal class value.

Methods inherited from class java.lang.Object

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

Methods inherited from interface weka.gui.beans.OffscreenChartRenderer

rendererName, renderHistogram, renderXYLineChart, renderXYScatterPlot

Constructor Detail

AbstractOffscreenChartRenderer

public AbstractOffscreenChartRenderer()

Method Detail

splitToClasses

protected java.util.List<Instances> splitToClasses(Instances insts,
                                                   int classIndex)

Utility method that splits the supplied Instances out to a list of Instances, where each Instances object contains just the instances of one nominal class value. Does not check whether the supplied class index is a nominal attribute.

Parameters:

insts - the instances to split

classIndex - the index of the nominal class attribute

Returns:

a list of instances

optionsTipTextHTML

public java.lang.String optionsTipTextHTML()

Gets a short list of additional options (if any), suitable for displaying in a tip text, in HTML form. Concrete subclasses should override this if they can actually process additional options.

Specified by:

optionsTipTextHTML in interface OffscreenChartRenderer

Returns:

additional options description in simple HTML form

getOption

protected java.lang.String getOption(java.util.List<java.lang.String> options,
                                     java.lang.String toGet)

Utility method for retrieving the value of an option from a list of options. Returns null if the option to get isn't present in the list, an empty string if it is but no value has been specified (i.e. option is a flag) or the value of the option.

Format is:

optionName=optionValue

Parameters:

options - a list of options

toGet - the option to get the value of

Returns:

getIndexOfAttribute

protected int getIndexOfAttribute(Instances insts,
                                  java.lang.String attName)

Get the index of a named attribute in a set of Instances.

Parameters:

insts - the Instances

attName - the name of the attribute.

Returns:

the index of the attribute or -1 if the attribute is not in the Instances.