Class BollingerBandWidthRTIndicator

java.lang.Object

com.wualabs.qtsurfer.engine.indicators.core.AbstractRTIndicator

com.wualabs.qtsurfer.engine.indicators.core.AbstractDecorableRTIndicator

com.wualabs.qtsurfer.engine.indicators.bollinger.BollingerBandWidthRTIndicator

All Implemented Interfaces:

Resettable, RTIndicator

public class BollingerBandWidthRTIndicator
extends AbstractDecorableRTIndicator

Bollinger BandWidth RT Indicator.

See Also:

• http://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:bollinger_band_width

Field Summary

Fields

Modifier and Type	Field	Description
static final String	ID	Canonical catalog id, set as an explicit IndicatorMeta.ID override where getId() class-name derivation would be wrong.

Constructor Summary

Constructors

Constructor	Description
BollingerBandWidthRTIndicator(@NonNull BollingerBandsRTIndicator bollingerBandsRTIndicator)

Method Summary

Modifier and Type	Method	Description
double	getValue()	Computes the Bollinger BandWidth as a percentage: 100 * (upper - lower) / middle.
boolean	isReady()	Returns whether this indicator has received enough data to produce meaningful values.
double	update(double newValue)

Methods inherited from class AbstractDecorableRTIndicator

getIndicator, getIndicatorValue

Methods inherited from class AbstractRTIndicator

equals, getDisplayHint, getMeta, hashCode, hide, isPoison, reset, setValue, toString, toString, withDisplayHint, withMeta

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface RTIndicator

getId, isHidden, ro, update, update

Field Details

ID

public static final String ID

Canonical catalog id, set as an explicit IndicatorMeta.ID override where getId() class-name derivation would be wrong.

See Also:

• Constant Field Values

Constructor Details

BollingerBandWidthRTIndicator

public BollingerBandWidthRTIndicator(@NonNull
 @NonNull BollingerBandsRTIndicator bollingerBandsRTIndicator)

Method Details

isReady

public boolean isReady()

Description copied from interface: RTIndicator

Returns whether this indicator has received enough data to produce meaningful values.

During the warmup period, RTIndicator.getValue() may return 0 or a partial estimate that should not be used for trading decisions. Once this method returns true, the indicator's output is statistically valid.

The default implementation returns true for backward compatibility. Indicators with warmup requirements should override this method.

For composite indicators (e.g. Bollinger Bands, MACD), readiness is determined by the slowest internal component.

Returns:

true if the indicator has completed its warmup period

getValue

public double getValue()

Computes the Bollinger BandWidth as a percentage: 100 * (upper - lower) / middle. This is a derived/lazy indicator that recalculates from the Bollinger Bands state on every read rather than maintaining its own state.

Specified by:

getValue in interface RTIndicator

Overrides:

getValue in class AbstractRTIndicator

Returns:

the bandwidth as a percentage of the middle band

update

public double update(double newValue)

Specified by:

update in interface RTIndicator

Overrides:

update in class AbstractRTIndicator