agi.foundation.geometry

(agi.foundation.communications-2024r2.jar)

Class ScalarBitErrorRate<TModulation extends DigitalModulation>

java.lang.Object

agi.foundation.infrastructure.DefinitionalObject

agi.foundation.geometry.Scalar

agi.foundation.geometry.CommunicationObjectScalar

agi.foundation.geometry.ScalarBitErrorRate<TModulation>

Type Parameters:

TModulation - The type of modulation to look for when decoding the signal to compute bit error rate. If the Signal obtained from the IntendedSignalStrategy (get / set) does not contain this type of data, the resulting bit error rate will be 0.5.

All Implemented Interfaces:

ICloneWithContext, IEnumerateDependencies, IEquatableDefinition, IFreezable

public class ScalarBitErrorRate<TModulation extends DigitalModulation>
extends CommunicationObjectScalar

A scalar which represents the bit error rate (BER) from a receiver, as computed from the SignalProcessor identified by the ISignalOutputService and which must be available on the CommunicationObject (get / set).

Note that if the signal specified by the IntendedSignalStrategy (get / set) does not have a SignalDataRate associated with it, the bit error rate will be 0.5 representing a signal which could not be successfully demodulated to data.

Constructor Summary

Constructors

Modifier	Constructor and Description
	ScalarBitErrorRate(TypeLiteral<TModulation> typeLiteralTModulation) Initializes a new instance.
	ScalarBitErrorRate(TypeLiteral<TModulation> typeLiteralTModulation, IServiceProvider receiver, SignalPropagationGraph graph, IntendedSignalStrategy intendedSignalStrategy) Initialize a new instance based on the given parameters.
protected	ScalarBitErrorRate(TypeLiteral<TModulation> typeLiteralTModulation, ScalarBitErrorRate<TModulation> existingInstance, CopyContext context) Initializes a new instance as a copy of an existing instance.

Method Summary

Modifier and Type	Method and Description
protected boolean	checkForSameDefinition(CommunicationObjectScalar other) Checks to determine if another instance has the same definition as this instance and returns true if it does.
protected boolean	checkForSameDefinition(ScalarBitErrorRate<TModulation> other) Checks to determine if another instance has the same definition as this instance and returns true if it does.
Object	clone(CopyContext context) Clones this object using the specified context.
protected int	computeCurrentDefinitionHashCode() Computes a hash code based on the current properties of this object.
ScalarEvaluator	getEvaluator(EvaluatorGroup group) Get an evaluator to compute bit error rate.

Methods inherited from class agi.foundation.geometry.CommunicationObjectScalar

checkForSameDefinition, enumerateDependencies, getCommunicationObject, getIntendedSignalStrategy, getPropagationGraph, getUseLogarithmicSampling, setCommunicationObject, setIntendedSignalStrategy, setPropagationGraph, setUseLogarithmicSampling, validateProperties

Methods inherited from class agi.foundation.geometry.Scalar

add, add, add, add, add, checkForSameDefinition, createScalarDerivative, divide, divide, divide, divide, divide, getEvaluator, multiply, multiply, multiply, multiply, multiply, power, subtract, subtract, subtract, subtract, subtract, toScalar

Methods inherited from class agi.foundation.infrastructure.DefinitionalObject

areSameDefinition, areSameDefinition, areSameDefinition, areSameDefinition, areSameDefinition, collectionItemsAreSameDefinition, collectionItemsAreSameDefinition, collectionItemsAreSameDefinition, dictionaryItemsAreSameDefinition, freeze, freezeAggregatedObjects, getCollectionHashCode, getCollectionHashCode, getCollectionHashCode, getDefinitionHashCode, getDefinitionHashCode, getDefinitionHashCode, getDefinitionHashCode, getDefinitionHashCode, getDefinitionHashCode, getDictionaryHashCode, getIsFrozen, isSameDefinition, throwIfFrozen

Methods inherited from class java.lang.Object

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

Constructor Detail

ScalarBitErrorRate

public ScalarBitErrorRate(TypeLiteral<TModulation> typeLiteralTModulation)

Initializes a new instance.

Parameters:

typeLiteralTModulation - A TypeLiteral object representing the generic type TModulation.

ScalarBitErrorRate

public ScalarBitErrorRate(TypeLiteral<TModulation> typeLiteralTModulation,
                          IServiceProvider receiver,
                          SignalPropagationGraph graph,
                          IntendedSignalStrategy intendedSignalStrategy)

Initialize a new instance based on the given parameters.

Parameters:

typeLiteralTModulation - A TypeLiteral object representing the generic type TModulation.

receiver - The receiver which provides the ISignalOutputService needed to compute this scalar.

graph - The graph of communication links used to propagate signals.

intendedSignalStrategy - The strategy used to identify the signal to use when computing the scalar value.

ScalarBitErrorRate

protected ScalarBitErrorRate(TypeLiteral<TModulation> typeLiteralTModulation,
                             @Nonnull
                             ScalarBitErrorRate<TModulation> existingInstance,
                             @Nonnull
                             CopyContext context)

Initializes a new instance as a copy of an existing instance.

See ICloneWithContext.clone(CopyContext) for more information about how to implement this constructor in a derived class.

Parameters:

typeLiteralTModulation - A TypeLiteral object representing the generic type TModulation.

existingInstance - The existing instance to copy.

context - A CopyContext that controls the depth of the copy.

Throws:

ArgumentNullException - Thrown when existingInstance or context is null.

Method Detail

clone

public Object clone(CopyContext context)

Clones this object using the specified context.

This method should be implemented to call a copy constructor on the class of the object being cloned. The copy constructor should take the CopyContext as a parameter in addition to the existing instance to copy. The copy constructor should first call CopyContext.addObjectMapping(T, T) to identify the newly constructed instance as a copy of the existing instance. It should then copy all fields, using CopyContext.updateReference(T) to copy any reference fields.

A typical implementation of ICloneWithContext:

public static class MyClass implements ICloneWithContext {
    public MyClass(MyClass existingInstance, CopyContext context) {
        context.addObjectMapping(existingInstance, this);
        someReference = context.updateReference(existingInstance.someReference);
    }

    @Override
    public final Object clone(CopyContext context) {
        return new MyClass(this, context);
    }

    private Object someReference;
}

In general, all fields that are reference types should be copied with a call to CopyContext.updateReference(T). There are a couple of exceptions:

1. Fields that are aggregate parts of the object should always be copied. A referenced object is an aggregate if properties or methods on the object being copied can modify the externally-visible value of the referenced object.
2. If the semantics of the referenced object require that it have a single parent, owner, context, etc., and the object being copied is that parent, owner, or context, then the referenced object should always be copied.

If one of these exceptions applies, the CopyContext should be given an opportunity to update the reference before the reference is copied explicitly. Use CopyContext.updateReference(T) to update the reference. If CopyContext.updateReference(T) returns the original object, indicating that the context does not have a replacement registered, then copy the object manually by invoking a Clone method, a copy constructor, or by manually constructing a new instance and copying the values.

alwaysCopy = context.updateReference(existingInstance.alwaysCopy);
if (existingInstance.alwaysCopy != null && alwaysCopy == existingInstance.alwaysCopy) {
    alwaysCopy = (AlwaysCopy) existingInstance.alwaysCopy.clone(context);
}

If you are implementing an evaluator (a class that implements IEvaluator), the IEvaluator.updateEvaluatorReferences(agi.foundation.infrastructure.CopyContext) method shares some responsibilities with the copy context constructor. Code duplication can be avoided by doing the following:

1. For references to other evaluators ONLY, simply assign the reference in the constructor instead of calling CopyContext.updateReference(T). You should still call CopyContext.updateReference(T) on any references to non-evaluators.
2. Call IEvaluator.updateEvaluatorReferences(agi.foundation.infrastructure.CopyContext) as the last line in the constructor and pass it the same CopyContext passed to the constructor.
3. Implement IEvaluator.updateEvaluatorReferences(agi.foundation.infrastructure.CopyContext) as normal. See the reference documentation for IEvaluator.updateEvaluatorReferences(agi.foundation.infrastructure.CopyContext) for more information on implementing that method.

public MyClass(MyClass existingInstance, CopyContext context) {
    super(existingInstance, context);
    someReference = context.updateReference(existingInstance.someReference);
    evaluatorReference = existingInstance.evaluatorReference;
    updateEvaluatorReferences(context);
}

@Override
public void updateEvaluatorReferences(CopyContext context) {
    evaluatorReference = context.updateReference(evaluatorReference);
}

@Override
public Object clone(CopyContext context) {
    return new MyClass(this, context);
}

private Object someReference;
private IEvaluator evaluatorReference;

Specified by:

clone in interface ICloneWithContext

Specified by:

clone in class DefinitionalObject

Parameters:

context - The context to use to perform the copy.

Returns:

A new instance which is a copy of this object.

checkForSameDefinition

protected final boolean checkForSameDefinition(CommunicationObjectScalar other)

Checks to determine if another instance has the same definition as this instance and returns true if it does. Derived classes MUST override this method and check all new fields introduced by the derived class for definitional equivalence. It is NOT necessary to check base class fields because the base class will already have done that. When overriding this method, you should NOT call the base implementation because it will return false for all derived-class instances. Derived classes should check the type of other to preserve the symmetric nature of IEquatableDefinition.isSameDefinition(java.lang.Object).

Specified by:

checkForSameDefinition in class CommunicationObjectScalar

Parameters:

other - The other instance to compare to this one.

Returns:

true if the two objects are defined equivalently; otherwise false.

checkForSameDefinition

protected boolean checkForSameDefinition(ScalarBitErrorRate<TModulation> other)

Checks to determine if another instance has the same definition as this instance and returns true if it does. Derived classes MUST override this method and check all new fields introduced by the derived class for definitional equivalence. It is NOT necessary to check base class fields because the base class will already have done that. When overriding this method, you should NOT call the base implementation because it will return false for all derived-class instances. Derived classes should check the type of other to preserve the symmetric nature of IEquatableDefinition.isSameDefinition(java.lang.Object).

Parameters:

other - The other instance to compare to this one.

Returns:

true if the two objects are defined equivalently; otherwise false.

computeCurrentDefinitionHashCode

protected int computeCurrentDefinitionHashCode()

Computes a hash code based on the current properties of this object. Derived classes MUST override this method and compute a hash code that combines: a unique hash code seed, the base implementation result, and the hash codes of all new fields introduced by the derived class which are used in the ScalarBitErrorRate.checkForSameDefinition(agi.foundation.geometry.CommunicationObjectScalar) method.

Overrides:

computeCurrentDefinitionHashCode in class CommunicationObjectScalar

Returns:

The computed hash code.

getEvaluator

public ScalarEvaluator getEvaluator(EvaluatorGroup group)

Get an evaluator to compute bit error rate.

Specified by:

getEvaluator in class Scalar

Parameters:

group - The evaluator group in which to create evaluators.

Returns:

An evaluator which computes bit error rate.

Throws:

ArgumentNullException - Thrown when group is null.

PropertyInvalidException - Thrown when PropagationGraph (get / set), IntendedSignalStrategy (get / set), or CommunicationObject (get / set) are null, or when PropagationGraph (get / set) does not contain CommunicationObject (get / set).