agi.foundation.radar

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

Class TargetToReceiverPropagationLossScalar

java.lang.Object

agi.foundation.infrastructure.DefinitionalObject

agi.foundation.geometry.Scalar

agi.foundation.radar.SingleTargetRadarLinkScalar

agi.foundation.radar.TargetToReceiverPropagationLossScalar

All Implemented Interfaces:

ICloneWithContext, IEnumerateDependencies, IEquatableDefinition, IFreezable

public class TargetToReceiverPropagationLossScalar
extends SingleTargetRadarLinkScalar

A SingleTargetRadarLinkScalar which represents the total propagation loss, as a unitless ratio, between the target object and the radar receiver. The value is computed from all of the propagation loss models (e.g. FreeSpacePathLossModel) which were added to the WirelessLinkExtension of the link ExtensibleObject between the radar transmitter to the target object.

Constructor Summary

Constructors

Constructor and Description
TargetToReceiverPropagationLossScalar(IServiceProvider radarTransmitter, IServiceProvider target, IServiceProvider radarReceiver, IntendedSignalStrategy intendedSignalStrategy, SignalPropagationGraph graph) Initializes a new instance.
TargetToReceiverPropagationLossScalar(TargetToReceiverPropagationLossScalar 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(SingleTargetRadarLinkScalar other) Checks to determine if another instance has the same definition as this instance and returns true if it does.
protected boolean	checkForSameDefinition(TargetToReceiverPropagationLossScalar 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) Gets an evaluator to compute the total propagation loss, as a unitless ratio, between the target object and the radar receiver.

Methods inherited from class agi.foundation.radar.SingleTargetRadarLinkScalar

checkForSameDefinition, enumerateDependencies, freezeAggregatedObjects, getEvaluateInterference, getIntendedSignalStrategy, getRadarReceiver, getRadarTransmitter, getSignalPropagationGraph, getTarget, getUseLogarithmicSampling, 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, 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

TargetToReceiverPropagationLossScalar

public TargetToReceiverPropagationLossScalar(IServiceProvider radarTransmitter,
                                             IServiceProvider target,
                                             IServiceProvider radarReceiver,
                                             IntendedSignalStrategy intendedSignalStrategy,
                                             SignalPropagationGraph graph)

Initializes a new instance.

The EvaluateInterference (get) property is defaulted to false.

Parameters:

radarTransmitter - An IServiceProvider which represents the radar transmitter.

target - An IServiceProvider which represents the radar target. A valid target instance must provide the IPointScattererService service.

radarReceiver - An IServiceProvider which represents the radar receiver.

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

intendedSignalStrategy - The method used to identify the desired signal for scalar evaluation.

TargetToReceiverPropagationLossScalar

public TargetToReceiverPropagationLossScalar(@Nonnull
                                             TargetToReceiverPropagationLossScalar 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:

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(SingleTargetRadarLinkScalar 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 SingleTargetRadarLinkScalar

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(TargetToReceiverPropagationLossScalar 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 TargetToReceiverPropagationLossScalar.checkForSameDefinition(agi.foundation.radar.SingleTargetRadarLinkScalar) method.

Overrides:

computeCurrentDefinitionHashCode in class SingleTargetRadarLinkScalar

Returns:

The computed hash code.

getEvaluator

public ScalarEvaluator getEvaluator(EvaluatorGroup group)

Gets an evaluator to compute the total propagation loss, as a unitless ratio, between the target object and the radar receiver.

The ScalarEvaluator returned from this method assumes that the evaluation time is equivalent to the time of signal transmission. The scalar value computed is a unitless ratio.

Specified by:

getEvaluator in class Scalar

Parameters:

group - The evaluator group in which to create evaluators.

Returns:

An evaluator which computes the total propagation loss, as a unitless ratio, between the target object and the radar receiver.

Throws:

PropertyInvalidException - Thrown if any of the properties are null.

IllegalStateException - Thrown if the RadarTransmitter (get), Target (get), and RadarReceiver (get) instances do not form a valid link path in the SignalPropagationGraph (get) instance.

ServiceNotAvailableException - Thrown if the link between the target and the radar receiver in the SignalPropagationGraph (get) does not provide the ITransmittedSignalService or IPropagatedSignalService. The ITransmittedSignalService and IPropagatedSignalService can be missing if the WirelessLinkExtension was not added to the link ExtensibleObject.

ArgumentNullException - Thrown if the group argument is null.