agi.foundation.geometry

(agi.foundation.models-2025r1.jar)

Class ScalarGrazingAltitudeBetweenTwoPoints

java.lang.Object

agi.foundation.infrastructure.DefinitionalObject

agi.foundation.geometry.Scalar

agi.foundation.geometry.ScalarGrazingAltitudeBetweenTwoPoints

All Implemented Interfaces:

ICloneWithContext, IEnumerateDependencies, IEquatableDefinition, IFreezable

public class ScalarGrazingAltitudeBetweenTwoPoints
extends Scalar

Calculates the altitude of the point on the line of sight vector between two objects nearest the ellipsoid that defines the input CentralBody (get / set). If the line of sight passes through the CentralBody (get / set), the altitude returned will be negative and represents the maximum depth required to reach the surface.

Constructor Summary

Constructors

Modifier	Constructor and Description
	ScalarGrazingAltitudeBetweenTwoPoints() Initializes an instance.
	ScalarGrazingAltitudeBetweenTwoPoints(CentralBody centralBody, IServiceProvider fromObject, IServiceProvider toObject) Initializes an instance with the input parameters.
	ScalarGrazingAltitudeBetweenTwoPoints(IServiceProvider fromObject, IServiceProvider toObject) Initializes an instance with the input parameters.
protected	ScalarGrazingAltitudeBetweenTwoPoints(ScalarGrazingAltitudeBetweenTwoPoints 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(Scalar other) Checks to determine if another instance has the same definition as this instance and returns true if it does.
protected boolean	checkForSameDefinition(ScalarGrazingAltitudeBetweenTwoPoints 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.
void	enumerateDependencies(DependencyEnumerator enumerator) Enumerates the dependencies of this object by calling DependencyEnumerator#enumerate(T) for each object that this object directly depends upon.
CentralBody	getCentralBody() Gets the central body relative to which the altitude is computed.
ScalarEvaluator	getEvaluator(EvaluatorGroup group) Gets an evaluator that can be used to find the value of this scalar function at a given JulianDate.
IServiceProvider	getFromObject() Gets the object that provides the starting location for the line of sight vector.
IServiceProvider	getToObject() Gets the object that provides the ending location for the line of sight vector.
void	setCentralBody(CentralBody value) Sets the central body relative to which the altitude is computed.
void	setFromObject(IServiceProvider value) Sets the object that provides the starting location for the line of sight vector.
void	setToObject(IServiceProvider value) Sets the object that provides the ending location for the line of sight vector.

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

ScalarGrazingAltitudeBetweenTwoPoints

public ScalarGrazingAltitudeBetweenTwoPoints()

Initializes an instance. All properties will need to be set before using.

ScalarGrazingAltitudeBetweenTwoPoints

public ScalarGrazingAltitudeBetweenTwoPoints(IServiceProvider fromObject,
                                             IServiceProvider toObject)

Initializes an instance with the input parameters. The CentralBody (get / set) defaults to Earth from the CentralBodiesFacet.

Parameters:

fromObject - The origin of the line of sight line segment. The object should be able to provide the ILocationPointService.

toObject - The terminus of the line of sight line segment. The object should be able to provide the ILocationPointService.

ScalarGrazingAltitudeBetweenTwoPoints

public ScalarGrazingAltitudeBetweenTwoPoints(CentralBody centralBody,
                                             IServiceProvider fromObject,
                                             IServiceProvider toObject)

Initializes an instance with the input parameters.

Parameters:

centralBody - The CentralBody (get / set) about which the grazing altitude is computed.

fromObject - The origin of the line of sight line segment. The object should be able to provide the ILocationPointService.

toObject - The terminus of the line of sight line segment. The object should be able to provide the ILocationPointService.

ScalarGrazingAltitudeBetweenTwoPoints

protected ScalarGrazingAltitudeBetweenTwoPoints(@Nonnull
                                                ScalarGrazingAltitudeBetweenTwoPoints 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(Scalar 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 Scalar

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(ScalarGrazingAltitudeBetweenTwoPoints 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 ScalarGrazingAltitudeBetweenTwoPoints.checkForSameDefinition(agi.foundation.geometry.Scalar) method.

Overrides:

computeCurrentDefinitionHashCode in class Scalar

Returns:

The computed hash code.

enumerateDependencies

public void enumerateDependencies(DependencyEnumerator enumerator)

Enumerates the dependencies of this object by calling DependencyEnumerator#enumerate(T) for each object that this object directly depends upon. Derived classes which contain additional dependencies MUST override this method, call the base implementation, and enumerate dependencies introduced by the derived class.

Specified by:

enumerateDependencies in interface IEnumerateDependencies

Overrides:

enumerateDependencies in class DefinitionalObject

Parameters:

enumerator - The enumerator that is informed of the dependencies of this object.

getFromObject

public final IServiceProvider getFromObject()

Gets the object that provides the starting location for the line of sight vector. The object should be able to provide the ILocationPointService.

setFromObject

public final void setFromObject(IServiceProvider value)

Sets the object that provides the starting location for the line of sight vector. The object should be able to provide the ILocationPointService.

getToObject

public final IServiceProvider getToObject()

Gets the object that provides the ending location for the line of sight vector. The object should be able to provide the ILocationPointService.

setToObject

public final void setToObject(IServiceProvider value)

Sets the object that provides the ending location for the line of sight vector. The object should be able to provide the ILocationPointService.

getCentralBody

public final CentralBody getCentralBody()

Gets the central body relative to which the altitude is computed.

By default, the value of this property is the EarthCentralBody in the CentralBodiesFacet instance in the CalculationContext.

setCentralBody

public final void setCentralBody(CentralBody value)

Sets the central body relative to which the altitude is computed.

By default, the value of this property is the EarthCentralBody in the CentralBodiesFacet instance in the CalculationContext.

getEvaluator

public ScalarEvaluator getEvaluator(EvaluatorGroup group)

Gets an evaluator that can be used to find the value of this scalar function at a given JulianDate. Adds the evaluator to the EvaluatorGroup.

Specified by:

getEvaluator in class Scalar

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.

Returns:

An evaluator for this scalar.

Throws:

PropertyInvalidException - Thrown if FromObject (get / set), ToObject (get / set), or CentralBody (get / set) is null.

ServiceNotAvailableException - Thrown if the FromObject (get / set) or ToObject (get / set) do not provide the ILocationPointService service.