org.eclipse.ocl.examples.impactanalyzer.instanceScope
Class IdentityNavigationStep

java.lang.Object
  org.eclipse.ocl.examples.impactanalyzer.instanceScope.AbstractNavigationStep
      org.eclipse.ocl.examples.impactanalyzer.instanceScope.IdentityNavigationStep

All Implemented Interfaces:

NavigationStep, SemanticComparable

public class IdentityNavigationStep
extends AbstractNavigationStep

Performs a trivial "identity" navigation, returning the fromObject again. This is useful when only the type checking that is performed by AbstractNavigationStep.navigate(Set, TracebackCache, Notification) shall be employed, such as for an oclAsType method call.

When the source and target type have no common elements in the reflexive subclass inheritance trees, this means that the step will always return an empty set. This property is analyzed during the construction of this step object and cached in the AbstractNavigationStep.alwaysEmpty field. If true, this makes this step absolute, and AbstractNavigationStep.isAlwaysEmpty() will return true.

Constructor Summary

IdentityNavigationStep(org.eclipse.emf.ecore.EClass sourceType, org.eclipse.emf.ecore.EClass targetType, OCLExpression oclExpression)

Method Summary

java.lang.String	contentToString(java.util.Map<NavigationStep,java.lang.Integer> visited, int indent)
boolean	isAbsolute() By default, navigation steps depend on the object set to which they are applied.
protected java.util.Set<AnnotatedEObject>	navigate(AnnotatedEObject fromObject, TracebackCache cache, org.eclipse.emf.common.notify.Notification changeEvent)

Methods inherited from class org.eclipse.ocl.examples.impactanalyzer.instanceScope.AbstractNavigationStep

addAlwaysEmptyChangeListener, addEnteringScopes, addExpressionForWhichThisIsNavigationStep, addHashCodeChangeListener, addLeavingScopes, addSourceTypeChangeListener, addTargetTypeChangeListener, annotateEObject, distinctSize, distinctSize, fireAfterHashCodeChange, fireBeforeHashCodeChange, getDebugInfo, getEnteringScopes, getId, getLeavingScopes, getNavigateCounter, getResultObjectsCounter, getSemanticIdentity, getSourceType, getTargetType, haveIntersectingSubclassTree, incrementNavigateCounter, isAlwaysEmpty, navigate, newTokenForFiringHashCodeChangeEvent, setAlwaysEmpty, size, size, toString, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

IdentityNavigationStep

public IdentityNavigationStep(org.eclipse.emf.ecore.EClass sourceType,
                              org.eclipse.emf.ecore.EClass targetType,
                              OCLExpression oclExpression)

Method Detail

navigate

protected java.util.Set<AnnotatedEObject> navigate(AnnotatedEObject fromObject,
                                                   TracebackCache cache,
                                                   org.eclipse.emf.common.notify.Notification changeEvent)

Specified by:

navigate in class AbstractNavigationStep

isAbsolute

public boolean isAbsolute()

Description copied from class: AbstractNavigationStep

By default, navigation steps depend on the object set to which they are applied.

Specified by:

isAbsolute in interface NavigationStep

Overrides:

isAbsolute in class AbstractNavigationStep

Returns:

always false

contentToString

public java.lang.String contentToString(java.util.Map<NavigationStep,java.lang.Integer> visited,
                                        int indent)

Overrides:

contentToString in class AbstractNavigationStep