agi.foundation.segmentpropagation

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

Class SegmentList

java.lang.Object

agi.foundation.infrastructure.DefinitionalObject

agi.foundation.segmentpropagation.SegmentDefinition

agi.foundation.segmentpropagation.SegmentList

All Implemented Interfaces:

ICloneWithContext, IEnumerateDependencies, IEquatableDefinition, IFreezable

Direct Known Subclasses:

TargetedSegmentList

public class SegmentList
extends SegmentDefinition

A class that holds a list of SegmentDefinitions that gets propagated in series. When this types propagator is propagated, you may always safely cast the results returned to SegmentListResults. This is a SegmentDefinition, so you can nest a SegmentList in another SegmentList.

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	addPropagationFinishedEvent(EventHandler<SegmentPropagationEventArgs> value) An event that gets raised when propagation is complete.
protected boolean	checkForSameDefinition(SegmentDefinition other) Checks to determine if another instance has the same definition as this instance and returns true if it does.
protected boolean	checkForSameDefinition(SegmentList 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.
protected SegmentPropagator	createSegmentPropagator(EvaluatorGroup group, SegmentDefinition previousSegment) Creates, configures, and returns the SegmentPropagator for this segment.
void	enumerateDependencies(DependencyEnumerator enumerator) Enumerates the dependencies of this object by calling DependencyEnumerator#enumerate(T) for each object that this object directly depends upon.
protected void	freezeAggregatedObjects() Called by DefinitionalObject.freeze() to also freeze any objects that are considered to be a part of this object.
StateElementAdapterDefinition	getElementAdapter(String element) Returns the adapter for the given state element.
List<String>	getElements() Gets the names of all of the elements that this segment is propagating.
SegmentDefinition	getFirstSegmentDefinitionByName(String segmentName) Loops over the Segments (get) in this SegmentList and returns the first one with the specified Name (get / set), or null if a segment with that segmentName is not in the list
SegmentListPropagator	getSegmentListPropagator() Creates and returns the propagator for this segment list.
SegmentListPropagator	getSegmentListPropagator(EvaluatorGroup group) Creates and returns the propagator for this segment list.
SegmentListPropagator	getSegmentListPropagator(EvaluatorGroup group, SegmentDefinition previousSegment) Creates and returns the propagator for this SegmentList.
SegmentListPropagator	getSegmentListPropagator(SegmentDefinition previousSegment) Creates and returns the propagator for this segment list.
List<SegmentDefinition>	getSegments() Gets the segments that will get propagated.
SegmentDefinition	getSegmentToInitializeNextSegmentWith() Returns the SegmentDefinition that should be used to initialize the next SegmentDefinition after this SegmentList with.
void	removePropagationFinishedEvent(EventHandler<SegmentPropagationEventArgs> value) An event that gets raised when propagation is complete.

Methods inherited from class agi.foundation.segmentpropagation.SegmentDefinition

checkForSameDefinition, containsElement, getDefinedIn, getName, getNextStateBehavior, getPassAllElementsToNextSegment, getPropagationDirection, getSegmentPropagator, getSegmentPropagator, getSegmentPropagator, getSegmentPropagator, removeElement, setElementAndAdapter, setName, setNextStateBehavior, setPropagationDirection, toString

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, wait, wait, wait

Constructor Detail

SegmentList

public SegmentList()

Initializes a new instance. At least one SegmentDefinition must be added to the Segments (get).

SegmentList

protected SegmentList(@Nonnull
                      SegmentList 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(SegmentDefinition 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 SegmentDefinition

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(SegmentList 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 SegmentList.checkForSameDefinition(agi.foundation.segmentpropagation.SegmentDefinition) method.

Overrides:

computeCurrentDefinitionHashCode in class SegmentDefinition

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.

freezeAggregatedObjects

protected void freezeAggregatedObjects()

Called by DefinitionalObject.freeze() to also freeze any objects that are considered to be a part of this object. Derived classes which contain additional aggregated objects MUST override this method, call the base implementation, and freeze aggregated objects introduced by the derived class. The objects that need to be frozen in this method are frequently created in this object's constructor and are not settable via properties.

Overrides:

freezeAggregatedObjects in class DefinitionalObject

getSegments

@Nonnull
public final List<SegmentDefinition> getSegments()

Gets the segments that will get propagated. It is recommended that you do not add the same SegmentDefinition more than once. You will be limited in what results you can easily extract from a SegmentListResults, and the SegmentListConfiguration will only return the configuration of the first SegmentPropagator made from that SegmentDefinition in the list.

getFirstSegmentDefinitionByName

@Nullable
public final SegmentDefinition getFirstSegmentDefinitionByName(String segmentName)

Loops over the Segments (get) in this SegmentList and returns the first one with the specified Name (get / set), or null if a segment with that segmentName is not in the list

Parameters:

segmentName - The name of the SegmentDefinition to look for

Returns:

The SegmentListPropagator configured with the segment propagators of all of this Segments (get).

getSegmentListPropagator

@Nonnull
public final SegmentListPropagator getSegmentListPropagator()

Creates and returns the propagator for this segment list.

Returns:

The SegmentListPropagator configured with the propagators of all of this Segments (get).

getSegmentListPropagator

@Nonnull
public final SegmentListPropagator getSegmentListPropagator(@Nonnull
                                                                      EvaluatorGroup group)

Creates and returns the propagator for this segment list.

Parameters:

group - The EvaluatorGroup to use when making evaluators.

Returns:

The SegmentListPropagator configured with the segment propagators of all of this Segments (get).

getSegmentListPropagator

@Nonnull
public final SegmentListPropagator getSegmentListPropagator(SegmentDefinition previousSegment)

Creates and returns the propagator for this segment list.

Parameters:

previousSegment - The previous segment.

Returns:

The SegmentListPropagator configured with the segment propagators of all of this Segments (get).

getSegmentListPropagator

@Nonnull
public final SegmentListPropagator getSegmentListPropagator(@Nonnull
                                                                      EvaluatorGroup group,
                                                                      SegmentDefinition previousSegment)

Creates and returns the propagator for this SegmentList.

Parameters:

group - The EvaluatorGroup to use when making evaluators.

previousSegment - The previous segment.

Returns:

The SegmentListPropagator configured with the segment propagators of all of this Segments (get).

addPropagationFinishedEvent

public void addPropagationFinishedEvent(EventHandler<SegmentPropagationEventArgs> value)

An event that gets raised when propagation is complete.

Specified by:

addPropagationFinishedEvent in class SegmentDefinition

removePropagationFinishedEvent

public void removePropagationFinishedEvent(EventHandler<SegmentPropagationEventArgs> value)

An event that gets raised when propagation is complete.

Specified by:

removePropagationFinishedEvent in class SegmentDefinition

createSegmentPropagator

protected SegmentPropagator createSegmentPropagator(EvaluatorGroup group,
                                                    SegmentDefinition previousSegment)

Creates, configures, and returns the SegmentPropagator for this segment. This method should check that all of the required properties on the concrete instance are configured properly before constructing the SegmentPropagator to be returned.

Specified by:

createSegmentPropagator in class SegmentDefinition

Parameters:

group - The group to use during creation.

previousSegment - The previous segment. Some segments will require the previousSegment to be set, whereas other will require that the previous segment not be null, whereas others will only use information from it if provided. It is up to you writing a concrete type to enforce what makes sense for your particular segment in this method.

Returns:

The propagator for this segment.

getElementAdapter

public StateElementAdapterDefinition getElementAdapter(String element)

Returns the adapter for the given state element. The StateElementAdapters handle the various transformations of the propagated elements between segments (for example, if the integration frame of a point being propagated changes from one segment to another, the adapter is what handles that transformation between segment). All elements propagated by this segment must have an adapter returned by this method (even if that adapter simply returns the original state). If multiple segments are being propagated by this segment (as a SegmentList would), this must return the adapter of the StateElementAdapter of the element for the final known segment getting propagated.

In general, the concrete SegmentDefinition should have a list of the adapter factory instances that are valid for this segment, and then this method would get the element definition object from this segments configuration.

Overrides:

getElementAdapter in class SegmentDefinition

Parameters:

element - The element whose StateElementAdapter is needed.

Returns:

The adapter with the element defined-in set, or null if there is no such factory.

getElements

public List<String> getElements()

Gets the names of all of the elements that this segment is propagating.

Unless the logic of a derived segment requires it, there is no requirement that the same elements get propagated from segment to segment (for example, you can propagate a satellite and the booster that got it into orbit. When the booster reenters the atmosphere, you do not have to keep that element around in later segments). However values that you want to be propagated from segment to segment must have the same name (continuing the example, the name of the satellite getting propagated needs to be consistent from segment to segment).

Overrides:

getElements in class SegmentDefinition

getSegmentToInitializeNextSegmentWith

public SegmentDefinition getSegmentToInitializeNextSegmentWith()

Returns the SegmentDefinition that should be used to initialize the next SegmentDefinition after this SegmentList with. If it is known at the time when GetSegmentListPropagator is called that the final segment will be different, that other segment should be returned by this method.

Returns:

The SegmentDefinition that should be used to initialize the next segment in the SegmentList containing this segment. This can return null if there are no segments in this list.