agi.foundation.coordinates

(agi.foundation.models-2023r1.jar)

Class AxesAdapter

java.lang.Object

agi.foundation.infrastructure.DefinitionalObject

agi.foundation.coordinates.StateElementAdapterDefinition

agi.foundation.coordinates.TransformationalStateElementAdapterDefinition

agi.foundation.coordinates.AxesAdapter

All Implemented Interfaces:

ICloneWithContext, IEnumerateDependencies, IEquatableDefinition, IFreezable

public class AxesAdapter
extends TransformationalStateElementAdapterDefinition

The StateElementAdapterDefinition for the simple case when the element's definitional object and its defined-in object are just a Axes. Generally this will be used for various Vector types.

This type will create an adapter that will extract a Motion1 of the specified element from the first ITimeBasedState, perform a axes rotation on it, and save that rotated motion to the second state.

If you have some custom vector element getting propagated, create a StateElementAdapterDefinition that handles your specific element definition. But you can have your StateElementAdapterDefinition.getAdapter(agi.foundation.coordinates.StateElementAdapterDefinition, agi.foundation.EvaluatorGroup) method construct an instance of this factory and return this types adapter.

The actual adapter will detect if the previous and current Axes are the same, and no rotation will be done in that case.

Constructor Summary

Constructors

Modifier	Constructor and Description
	AxesAdapter() Initializes a new instance.
protected	AxesAdapter(AxesAdapter existingInstance, CopyContext context) Initializes a new instance as a copy of an existing instance.
	AxesAdapter(String elementIdentification, Axes currentAxes) Initializes a new instance.

Method Summary

Modifier and Type	Method and Description
protected boolean	checkForSameDefinition(AxesAdapter other) Checks to determine if another instance has the same definition as this instance and returns true if it does.
protected boolean	checkForSameDefinition(TransformationalStateElementAdapterDefinition 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.
StateElementAdapter	getAdapter(StateElementAdapterDefinition previousAdapter, EvaluatorGroup group) Creates the adapter defined by this instance.
Axes	getCurrentAxes() Gets the Axes that the ElementIdentification (get / set) in the state will be in once the state is adapted.
Axes	getPreviousAxes() Gets the Axes that the ElementIdentification (get / set) in the previous state is defined in.
void	setCurrentAxes(Axes value) Sets the Axes that the ElementIdentification (get / set) in the state will be in once the state is adapted.
void	setPreviousAxes(Axes value) Sets the Axes that the ElementIdentification (get / set) in the previous state is defined in.

Methods inherited from class agi.foundation.coordinates.TransformationalStateElementAdapterDefinition

checkForSameDefinition, enumerateDependencies, getCurrentDefinedIn, getPreviousDefinedIn, setCurrentDefinedIn, setPreviousDefinedIn

Methods inherited from class agi.foundation.coordinates.StateElementAdapterDefinition

checkForSameDefinition, getElementIdentification, setElementIdentification

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

AxesAdapter

public AxesAdapter()

Initializes a new instance. The ElementIdentification (get / set) must be set before StateElementAdapterDefinition.getAdapter(agi.foundation.coordinates.StateElementAdapterDefinition, agi.foundation.EvaluatorGroup) is called.

AxesAdapter

public AxesAdapter(String elementIdentification,
                   Axes currentAxes)

Initializes a new instance. The ElementIdentification (get / set) must be set before StateElementAdapterDefinition.getAdapter(agi.foundation.coordinates.StateElementAdapterDefinition, agi.foundation.EvaluatorGroup) is called.

Parameters:

elementIdentification - The name of the element this adapter will adapt.

currentAxes - The Axes that the elementIdentification is defined in.

AxesAdapter

protected AxesAdapter(@Nonnull
                      AxesAdapter 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(TransformationalStateElementAdapterDefinition 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 TransformationalStateElementAdapterDefinition

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(AxesAdapter 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 AxesAdapter.checkForSameDefinition(agi.foundation.coordinates.TransformationalStateElementAdapterDefinition) method.

Overrides:

computeCurrentDefinitionHashCode in class TransformationalStateElementAdapterDefinition

Returns:

The computed hash code.

getCurrentAxes

public final Axes getCurrentAxes()

Gets the Axes that the ElementIdentification (get / set) in the state will be in once the state is adapted.

setCurrentAxes

public final void setCurrentAxes(Axes value)

Sets the Axes that the ElementIdentification (get / set) in the state will be in once the state is adapted.

getPreviousAxes

public final Axes getPreviousAxes()

Gets the Axes that the ElementIdentification (get / set) in the previous state is defined in. It is best to configure whatever is calling StateElementAdapterDefinition.getAdapter(agi.foundation.coordinates.StateElementAdapterDefinition, agi.foundation.EvaluatorGroup) to pass in an old adapter. If there is no old defined in to work with, then the CurrentAxes (get / set) will be used for both the current and previous. This only needs to be set if it there is no previous adapter to use when the computation options (evaluators, propagators...) are created. If this is set, then it should take priority over the adapter passed into StateElementAdapterDefinition.getAdapter(agi.foundation.coordinates.StateElementAdapterDefinition, agi.foundation.EvaluatorGroup)

setPreviousAxes

public final void setPreviousAxes(Axes value)

Sets the Axes that the ElementIdentification (get / set) in the previous state is defined in. It is best to configure whatever is calling StateElementAdapterDefinition.getAdapter(agi.foundation.coordinates.StateElementAdapterDefinition, agi.foundation.EvaluatorGroup) to pass in an old adapter. If there is no old defined in to work with, then the CurrentAxes (get / set) will be used for both the current and previous. This only needs to be set if it there is no previous adapter to use when the computation options (evaluators, propagators...) are created. If this is set, then it should take priority over the adapter passed into StateElementAdapterDefinition.getAdapter(agi.foundation.coordinates.StateElementAdapterDefinition, agi.foundation.EvaluatorGroup)

getAdapter

public StateElementAdapter getAdapter(StateElementAdapterDefinition previousAdapter,
                                      EvaluatorGroup group)

Creates the adapter defined by this instance. Since adapters are meant to transition from one context to another, the previous adapter is passed in to finish the configuration. If it is not needed for your particular adapter it can be ignored.

Specified by:

getAdapter in class StateElementAdapterDefinition

Parameters:

previousAdapter - The properly configured previous adapter. Implementations of this method should be able to handle cases where the previousAdapter is of the same or compatible type. For example, a ReferenceFrameAdapter must be able to handle when another ReferenceFrameAdapter is passed in as the previousAdapter. If the types are incompatible, then this method should throw an exception as it is a sign that something is incorrectly configured. When possible, design your adapters to work properly even if this parameter is null. Consider adding extra properties to the derived type, or have a well defined default behavior if the previousAdapter is null.

group - The EvaluatorGroup to use when constructing any needed evaluators.

Returns:

The configured StateElementAdapter.