Class SmaRTIndicator

java.lang.Object

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

com.wualabs.qtsurfer.engine.indicators.core.AbstractIncrementalRTIndicator

com.wualabs.qtsurfer.engine.indicators.core.AbstractDecorableIncrementalRTIndicator

com.wualabs.qtsurfer.engine.indicators.averages.SmaRTIndicator

All Implemented Interfaces:

ClockAware, Resettable, CacheableRTIndicator, RTIndicator

public class SmaRTIndicator
extends AbstractDecorableIncrementalRTIndicator
implements CacheableRTIndicator

Simple 2-period and N periods SMA RT Indicator

Constructor Summary

Constructors

Constructor	Description
SmaRTIndicator()
SmaRTIndicator(int periods)
SmaRTIndicator(int periods, RTIndicator indicator)
SmaRTIndicator(RTIndicator indicator)

Method Summary

Modifier and Type	Method	Description
WindowSeries	getWindowSeries()
protected double	nextValue(double prevValue, double newValue)	Non-periodic (2-period) SMA: simple average of previous and new values.
void	reset()
String	signature()	Periods, averaging mode and source chain.
protected double	tickValue(int tick, boolean init, boolean endPeriod, double newValue)	Delegates to discrete or moving average tick computation based on the current mode.
SmaRTIndicator	withDiscreteMode(boolean discreteMode)

Methods inherited from class AbstractDecorableIncrementalRTIndicator

getIndicator, setClockSupplier, update

Methods inherited from class AbstractIncrementalRTIndicator

getLastUpdateValue, getPeriodCycles, getPeriods, getPrevValue, initValue, isPeriodic, isReady, prevNextValue, setPeriods

Methods inherited from class AbstractRTIndicator

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

Methods inherited from class Object

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

Methods inherited from interface RTIndicator

getDisplayHint, getId, getMeta, getValue, isHidden, isReady, ro, update, update, update

Constructor Details

SmaRTIndicator

public SmaRTIndicator()

SmaRTIndicator

public SmaRTIndicator(int periods)

SmaRTIndicator

public SmaRTIndicator(RTIndicator indicator)

SmaRTIndicator

public SmaRTIndicator(int periods,
 RTIndicator indicator)

Method Details

withDiscreteMode

public SmaRTIndicator withDiscreteMode(boolean discreteMode)

reset

public void reset()

Specified by:

reset in interface Resettable

Overrides:

reset in class AbstractDecorableIncrementalRTIndicator

getWindowSeries

public WindowSeries getWindowSeries()

signature

public String signature()

Periods, averaging mode and source chain.

discreteMode belongs here as much as the periods do: it selects between two genuinely different value series, and unlike the periods it is set after construction, which is exactly the shape of parameter a memoization key is most likely to forget. The signature is read when the indicator is registered, so reconfigure before registering, not after.

Specified by:

signature in interface CacheableRTIndicator

Returns:

the identity, or null when this instance cannot state one (an unidentifiable source, a mode the implementation does not model) and must therefore compute live

tickValue

protected double tickValue(int tick,
 boolean init,
 boolean endPeriod,
 double newValue)

Delegates to discrete or moving average tick computation based on the current mode.

Overrides:

tickValue in class AbstractIncrementalRTIndicator

Parameters:

tick - current tick index within the period (1-based)

init - true only on the very first update of this indicator

endPeriod - true when this tick completes the current period

newValue - the new input value

Returns:

the computed value for this tick

nextValue

protected double nextValue(double prevValue,
 double newValue)

Non-periodic (2-period) SMA: simple average of previous and new values. Used when periods=0 (no fixed period configured).

Overrides:

nextValue in class AbstractDecorableIncrementalRTIndicator

Parameters:

prevValue - the previous indicator value

newValue - the new input value

Returns:

the 2-period simple moving average