agi.foundation.cesium

(agi.foundation.cesium-2024r3.jar)

Class CesiumPositionExtension

java.lang.Object

agi.foundation.infrastructure.DefinitionalObject

agi.foundation.infrastructure.ObjectExtension

agi.foundation.cesium.CesiumPositionExtension

All Implemented Interfaces:

ICesiumPositionService, ICloneWithContext, IEnumerateDependencies, IEquatableDefinition, IFreezable, IServiceProvider

public class CesiumPositionExtension
extends ObjectExtension
implements ICesiumPositionService

An extension that specifies how an object's position should be written to CZML.

Constructor Summary

Constructors

Modifier	Constructor and Description
	CesiumPositionExtension() Initializes a new instance.
protected	CesiumPositionExtension(CesiumPositionExtension 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(CesiumPositionExtension other) Checks to determine if another instance has the same definition as this instance and returns true if it does.
protected boolean	checkForSameDefinition(ObjectExtension 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.
Duration	getBackwardExtrapolationDuration() Gets the amount of time to extrapolate backward before the property becomes undefined.
CesiumExtrapolationType	getBackwardExtrapolationType() Gets the type of extrapolation to perform when a value is requested at a time before any available samples.
Duration	getForwardExtrapolationDuration() Gets the amount of time to extrapolate forward before the property becomes undefined.
CesiumExtrapolationType	getForwardExtrapolationType() Gets the type of extrapolation to perform when a value is requested at a time after any available samples.
CesiumInterpolationAlgorithm	getInterpolationAlgorithm() Gets the algorithm to use for interpolation.
Integer	getInterpolationDegree() Gets the degree of the polynomial to use for interpolation.
Integer	getOrder() Gets the number of derivatives to write to CZML.
void	setBackwardExtrapolationDuration(Duration value) Sets the amount of time to extrapolate backward before the property becomes undefined.
void	setBackwardExtrapolationType(CesiumExtrapolationType value) Sets the type of extrapolation to perform when a value is requested at a time before any available samples.
void	setForwardExtrapolationDuration(Duration value) Sets the amount of time to extrapolate forward before the property becomes undefined.
void	setForwardExtrapolationType(CesiumExtrapolationType value) Sets the type of extrapolation to perform when a value is requested at a time after any available samples.
void	setInterpolationAlgorithm(CesiumInterpolationAlgorithm value) Sets the algorithm to use for interpolation.
void	setInterpolationDegree(Integer value) Sets the degree of the polynomial to use for interpolation.
void	setOrder(Integer value) Sets the number of derivatives to write to CZML.

Methods inherited from class agi.foundation.infrastructure.ObjectExtension

checkForSameDefinition, enumerateDependencies, getOwner, getService

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

CesiumPositionExtension

public CesiumPositionExtension()

Initializes a new instance.

CesiumPositionExtension

protected CesiumPositionExtension(@Nonnull
                                  CesiumPositionExtension 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(ObjectExtension 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 ObjectExtension

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(CesiumPositionExtension 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 CesiumPositionExtension.checkForSameDefinition(agi.foundation.infrastructure.ObjectExtension) method.

Overrides:

computeCurrentDefinitionHashCode in class ObjectExtension

Returns:

The computed hash code.

getOrder

@Nullable
public final Integer getOrder()

Gets the number of derivatives to write to CZML. Note that currently CZML only supports position and velocity. null indicates that the value will depend on other properties.

Specified by:

getOrder in interface ICesiumPositionService

setOrder

public final void setOrder(@Nullable
                           Integer value)

Sets the number of derivatives to write to CZML. Note that currently CZML only supports position and velocity. null indicates that the value will depend on other properties.

getInterpolationAlgorithm

@Nullable
public final CesiumInterpolationAlgorithm getInterpolationAlgorithm()

Gets the algorithm to use for interpolation. null indicates that the value will not be specified in the CZML output.

Specified by:

getInterpolationAlgorithm in interface ICesiumPositionService

setInterpolationAlgorithm

public final void setInterpolationAlgorithm(@Nullable
                                            CesiumInterpolationAlgorithm value)

Sets the algorithm to use for interpolation. null indicates that the value will not be specified in the CZML output.

getInterpolationDegree

@Nullable
public final Integer getInterpolationDegree()

Gets the degree of the polynomial to use for interpolation. null indicates that the value will not be specified in the CZML output.

Specified by:

getInterpolationDegree in interface ICesiumPositionService

setInterpolationDegree

public final void setInterpolationDegree(@Nullable
                                         Integer value)

Sets the degree of the polynomial to use for interpolation. null indicates that the value will not be specified in the CZML output.

getForwardExtrapolationType

@Nullable
public final CesiumExtrapolationType getForwardExtrapolationType()

Gets the type of extrapolation to perform when a value is requested at a time after any available samples. null indicates that the value will not be specified in the CZML output.

Specified by:

getForwardExtrapolationType in interface ICesiumPositionService

setForwardExtrapolationType

public final void setForwardExtrapolationType(@Nullable
                                              CesiumExtrapolationType value)

Sets the type of extrapolation to perform when a value is requested at a time after any available samples. null indicates that the value will not be specified in the CZML output.

getForwardExtrapolationDuration

@Nullable
public final Duration getForwardExtrapolationDuration()

Gets the amount of time to extrapolate forward before the property becomes undefined. A value of 0 will extrapolate forever. null indicates that the value will not be specified in the CZML output.

Specified by:

getForwardExtrapolationDuration in interface ICesiumPositionService

setForwardExtrapolationDuration

public final void setForwardExtrapolationDuration(@Nullable
                                                  Duration value)

Sets the amount of time to extrapolate forward before the property becomes undefined. A value of 0 will extrapolate forever. null indicates that the value will not be specified in the CZML output.

getBackwardExtrapolationType

@Nullable
public final CesiumExtrapolationType getBackwardExtrapolationType()

Gets the type of extrapolation to perform when a value is requested at a time before any available samples. null indicates that the value will not be specified in the CZML output.

Specified by:

getBackwardExtrapolationType in interface ICesiumPositionService

setBackwardExtrapolationType

public final void setBackwardExtrapolationType(@Nullable
                                               CesiumExtrapolationType value)

Sets the type of extrapolation to perform when a value is requested at a time before any available samples. null indicates that the value will not be specified in the CZML output.

getBackwardExtrapolationDuration

@Nullable
public final Duration getBackwardExtrapolationDuration()

Gets the amount of time to extrapolate backward before the property becomes undefined. A value of 0 will extrapolate forever. null indicates that the value will not be specified in the CZML output.

Specified by:

getBackwardExtrapolationDuration in interface ICesiumPositionService

setBackwardExtrapolationDuration

public final void setBackwardExtrapolationDuration(@Nullable
                                                   Duration value)

Sets the amount of time to extrapolate backward before the property becomes undefined. A value of 0 will extrapolate forever. null indicates that the value will not be specified in the CZML output.