agi.foundation.aircraftpropagation

(agi.foundation.aircraftpropagation-2024r1.jar)

Class AircraftStateElementConverter

java.lang.Object

agi.foundation.propagators.advanced.PropagationStateElementConverter

agi.foundation.aircraftpropagation.AircraftStateElementConverter

All Implemented Interfaces:

ICloneWithContext, IThreadAware

public class AircraftStateElementConverter
extends PropagationStateElementConverter

Represents output associated with a PropagationStateElement corresponding to a set of Cartesian values. This represents the indexed state, and a means of converting the raw output information back into a Motion<Cartesian>.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AircraftStateElementConverter(AircraftStateElementConverter existingInstance, CopyContext context) Initializes a new instance as a copy of an existing instance.
	AircraftStateElementConverter(String identification, Motion1<int[]> stateIndices, Cartesian initialPosition, Cartesian initialVelocity, Ellipsoid ellipsoid) Initializes a new instance.
	AircraftStateElementConverter(String identification, Motion1<int[]> stateIndices, Cartesian initialPosition, Cartesian initialVelocity, Ellipsoid ellipsoid, Motion1<double[]> weights) Initializes a new instance.

Method Summary

Modifier and Type	Method and Description
boolean	adjustStateFromElement(double[] overallRawState, Motion1<double[]> stateElementValues) Adjust the subset of the overall raw state corresponding to this element to new values.
<T> boolean	adjustStateWithType(double[] overallRawState, Motion1<T> newStateElement) Adjust the subset of the raw state corresponding to this element to new values.
Object	clone(CopyContext context) Clones this object using the specified context.
Motion1<Cartesian>	convertState(double[] overallState) Convert the raw state into a Cartesian and its derivatives.
int	getDimension() Gets the number of parameters (per Order (get)) within this element.
Motion1<double[]>	getElementFromState(double[] overallState) Produces this state element's values and their derivatives from the overall raw state.
Ellipsoid	getEllipsoid() Gets the ellipsoidal shape to be used in converting the propagation state elements.
Class<?>	getTypeOfOutput() Gets the type associated with the output of this instance.

Methods inherited from class agi.foundation.propagators.advanced.PropagationStateElementConverter

getAdaptiveWeights, getIdentification, getInitialState, getIsThreadSafe, getOrder, getStateIndices, setAdaptiveWeights

Methods inherited from class java.lang.Object

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

Constructor Detail

AircraftStateElementConverter

public AircraftStateElementConverter(String identification,
                                     @Nonnull
                                     Motion1<int[]> stateIndices,
                                     @Nonnull
                                     Cartesian initialPosition,
                                     @Nonnull
                                     Cartesian initialVelocity,
                                     Ellipsoid ellipsoid)

Initializes a new instance.

Parameters:

identification - A string identifying this instance in the overall output.

stateIndices - The indices of the individual values and their derivatives in the overall state.

initialPosition - The position of the aircraft in the fixed frame of the central body at the epoch of the overall NumericalPropagatorDefinition.

initialVelocity - The velocity of the aircraft in the fixed frame of the central body at the epoch of the overall NumericalPropagatorDefinition.

ellipsoid - The ellipsoidal shape of the central body.

AircraftStateElementConverter

public AircraftStateElementConverter(String identification,
                                     @Nonnull
                                     Motion1<int[]> stateIndices,
                                     @Nonnull
                                     Cartesian initialPosition,
                                     @Nonnull
                                     Cartesian initialVelocity,
                                     Ellipsoid ellipsoid,
                                     @Nonnull
                                     Motion1<double[]> weights)

Initializes a new instance.

Parameters:

identification - A string identifying this instance in the overall output.

stateIndices - The indices of the individual values and their derivatives in the overall state.

initialPosition - The position of the aircraft in the fixed frame of the central body at the epoch of the overall NumericalPropagatorDefinition.

initialVelocity - The velocity of the aircraft in the fixed frame of the central body at the epoch of the overall NumericalPropagatorDefinition.

ellipsoid - The ellipsoidal shape of the central body.

weights - A set of weights associated with each value in the state to use when performing adaptive step control with an AdaptiveNumericalIntegrator.

AircraftStateElementConverter

protected AircraftStateElementConverter(@Nonnull
                                        AircraftStateElementConverter 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 PropagationStateElementConverter

Parameters:

context - The context to use to perform the copy.

Returns:

A new instance which is a copy of this object.

getTypeOfOutput

public Class<?> getTypeOfOutput()

Gets the type associated with the output of this instance.

Specified by:

getTypeOfOutput in class PropagationStateElementConverter

getDimension

public int getDimension()

Gets the number of parameters (per Order (get)) within this element.

Specified by:

getDimension in class PropagationStateElementConverter

getEllipsoid

public final Ellipsoid getEllipsoid()

Gets the ellipsoidal shape to be used in converting the propagation state elements.

convertState

@Nonnull
public final Motion1<Cartesian> convertState(double[] overallState)

Convert the raw state into a Cartesian and its derivatives.

Specified by:

convertState in class PropagationStateElementConverter

Parameters:

overallState - The raw state to convert.

Returns:

The value and its derivatives corresponding to the state.

getElementFromState

@Nonnull
public Motion1<double[]> getElementFromState(double[] overallState)

Produces this state element's values and their derivatives from the overall raw state.

Specified by:

getElementFromState in class PropagationStateElementConverter

Parameters:

overallState - The overall raw state from which to produce this element's array.

Returns:

A representation of the values of this state as arrays of length Dimension (get) in a motion of this element's Order (get) minus one.

adjustStateWithType

public <T> boolean adjustStateWithType(double[] overallRawState,
                                       @Nonnull
                                       Motion1<T> newStateElement)

Adjust the subset of the raw state corresponding to this element to new values.

Specified by:

adjustStateWithType in class PropagationStateElementConverter

Type Parameters:

T - The type corresponding to the TypeOfOutput (get) of this element.

Parameters:

overallRawState - The overall raw state to adjust.

newStateElement - The new values and derivatives for the requested element.

Returns:

True if the update was successful. Otherwise, if the specified new element values did not contain enough derivatives or there was some other problem completing the update, this returns false.

Throws:

IllegalStateException - Thrown if the newStateElement are not an instance of Motion<Cartesian>.

adjustStateFromElement

public boolean adjustStateFromElement(double[] overallRawState,
                                      @Nonnull
                                      Motion1<double[]> stateElementValues)

Adjust the subset of the overall raw state corresponding to this element to new values.

Specified by:

adjustStateFromElement in class PropagationStateElementConverter

Parameters:

overallRawState - The overall raw state to adjust.

stateElementValues - The new values and derivatives for the requested element represented as an array. To obtain an instance of this array, call AircraftStateElementConverter.getElementFromState(double[]).

Returns:

True if the update was successful. Otherwise, if the specified new element values did not contain enough derivatives or there was some other problem completing the update, this returns false.