agi.foundation.communications.antennas

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

Class CosineExponentElementFactor

java.lang.Object

agi.foundation.infrastructure.DefinitionalObject

agi.foundation.communications.antennas.PhasedArrayElementFactor

agi.foundation.communications.antennas.CosineExponentElementFactor

All Implemented Interfaces:

ICloneWithContext, IEnumerateDependencies, IEquatableDefinition, IFreezable

public class CosineExponentElementFactor
extends PhasedArrayElementFactor

A PhasedArrayElementFactor which produces a cosine raised to the specified exponent element factor.

Constructor Summary

Constructors

Modifier	Constructor and Description
	CosineExponentElementFactor() Initializes a new instance.
protected	CosineExponentElementFactor(CosineExponentElementFactor existingInstance, CopyContext context) Initializes a new instance as a copy of an existing instance.
	CosineExponentElementFactor(double cosineExponent, double elementArea) Initializes a new instance.

Method Summary

Modifier and Type	Method and Description
protected boolean	checkForSameDefinition(CosineExponentElementFactor other) Checks to determine if another instance has the same definition as this instance and returns true if it does.
protected boolean	checkForSameDefinition(PhasedArrayElementFactor 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.
double	getCosineExponent() Gets the cosine exponent.
double	getElementArea() Gets the element area, in meters squared.
ScalarEvaluator	getEvaluator(EvaluatorGroup group, Vector linkDirection, Axes antennaAxes) Gets a ScalarEvaluator which computes an element factor using the equation 4 * PI * elementArea * direction.Z^(cosineExponent), where direction.Z is the z component of the unit vector in the link direction and cosineExponent and elementArea are given by the CosineExponent (get / set) and ElementArea (get / set) properties, respectively.
void	setCosineExponent(double value) Sets the cosine exponent.
void	setElementArea(double value) Sets the element area, in meters squared.

Methods inherited from class agi.foundation.communications.antennas.PhasedArrayElementFactor

checkForSameDefinition

Methods inherited from class agi.foundation.infrastructure.DefinitionalObject

areSameDefinition, areSameDefinition, areSameDefinition, areSameDefinition, areSameDefinition, collectionItemsAreSameDefinition, collectionItemsAreSameDefinition, collectionItemsAreSameDefinition, dictionaryItemsAreSameDefinition, enumerateDependencies, 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

CosineExponentElementFactor

public CosineExponentElementFactor()

Initializes a new instance.

Table of property default values.

Property	Default Value
CosineExponent (get / set)	1.0
ElementArea (get / set)	1.0 meters squared

CosineExponentElementFactor

public CosineExponentElementFactor(double cosineExponent,
                                   double elementArea)

Initializes a new instance.

Parameters:

cosineExponent - The cosine exponent value.

elementArea - The element area, in meters squared.

CosineExponentElementFactor

protected CosineExponentElementFactor(@Nonnull
                                      CosineExponentElementFactor 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(PhasedArrayElementFactor 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 PhasedArrayElementFactor

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(CosineExponentElementFactor 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 CosineExponentElementFactor.checkForSameDefinition(agi.foundation.communications.antennas.PhasedArrayElementFactor) method.

Overrides:

computeCurrentDefinitionHashCode in class PhasedArrayElementFactor

Returns:

The computed hash code.

getCosineExponent

public final double getCosineExponent()

Gets the cosine exponent.

Defaults to a value of 1.0.

setCosineExponent

public final void setCosineExponent(double value)

Sets the cosine exponent.

Defaults to a value of 1.0.

getElementArea

public final double getElementArea()

Gets the element area, in meters squared.

Defaults to a value of 1.0 meters squared.

setElementArea

public final void setElementArea(double value)

Sets the element area, in meters squared.

Defaults to a value of 1.0 meters squared.

getEvaluator

public ScalarEvaluator getEvaluator(EvaluatorGroup group,
                                    Vector linkDirection,
                                    Axes antennaAxes)

Gets a ScalarEvaluator which computes an element factor using the equation 4 * PI * elementArea * direction.Z^(cosineExponent), where direction.Z is the z component of the unit vector in the link direction and cosineExponent and elementArea are given by the CosineExponent (get / set) and ElementArea (get / set) properties, respectively.

Specified by:

getEvaluator in class PhasedArrayElementFactor

Parameters:

group - The group with which to associate the new evaluator. By grouping evaluators that are often evaluated at the same Julian dates, common computations can be performed only once for the entire group instead of multiple times for each evaluator.

linkDirection - The link direction vector.

antennaAxes - The antenna axes.

Returns:

A ScalarEvaluator which will evaluate the element factor.

Throws:

ArgumentNullException - Thrown if any of the arguments are null.

PropertyInvalidException - Thrown if ElementArea (get / set) is less than or equal to zero, or if CosineExponent (get / set) is less than zero.