org.chronos.chronosphere.impl.query

Class EObjectQueryStepBuilderImpl<S,I>

java.lang.Object

org.chronos.chronosphere.impl.query.EObjectQueryStepBuilderImpl<S,I>

All Implemented Interfaces:

EObjectQueryStepBuilder<S>, QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>, QueryStepBuilderInternal<S,org.eclipse.emf.ecore.EObject>, TraversalChainElement, TraversalTransformer<S,I,org.apache.tinkerpop.gremlin.structure.Vertex>

Direct Known Subclasses:

EObjectQueryAllReferencingEObjectsQueryStep, EObjectQueryAndStepBuilder, EObjectQueryAsEObjectStepBuilder, EObjectQueryClosureStepBuilder, EObjectQueryDistinctStepBuilder, EObjectQueryEAllContentsStepBuilder, EObjectQueryEContainerStepBuilder, EObjectQueryEContentsStepBuilder, EObjectQueryEGetInverseByNameStepBuilder, EObjectQueryEGetInverseByReferenceStepBuilder, EObjectQueryEGetReferenceStepBuilder, EObjectQueryExceptObjectsStepBuilder, EObjectQueryHasFeatureValueStepBuilder, EObjectQueryIdentityStepBuilder, EObjectQueryInstanceOfEClassNameStepBuilder, EObjectQueryInstanceOfEClassStepBuilder, EObjectQueryLimitStepBuilder, EObjectQueryNonNullStepBuilder, EObjectQueryNotStepBuilder, EObjectQueryOrStepBuilder

public abstract class EObjectQueryStepBuilderImpl<S,I>
extends java.lang.Object
implements EObjectQueryStepBuilder<S>, QueryStepBuilderInternal<S,org.eclipse.emf.ecore.EObject>, TraversalTransformer<S,I,org.apache.tinkerpop.gremlin.structure.Vertex>

Constructor Summary

Constructors

Constructor and Description
EObjectQueryStepBuilderImpl(TraversalChainElement previous)

Method Summary

Modifier and Type	Method and Description
EObjectQueryStepBuilder<S>	allReferencingEObjects() Navigates from an EObject to all other EObjects that reference it.
EObjectQueryStepBuilder<S>	and(QueryStepBuilder<org.eclipse.emf.ecore.EObject,?>... subqueries)
UntypedQueryStepBuilder<S,java.lang.Object>	back(java.lang.String stepName) Exits the current traversal state and goes back to a named step, or a named set.
EObjectQueryStepBuilder<S>	closure(org.eclipse.emf.ecore.EReference eReference, Direction direction) Calculates the transitive closure of the current EObject that is created by repeatedly following the given (outgoing) EReference.
long	count() Counts the number of elements in the current result, and returns that count.
EObjectQueryStepBuilder<S>	distinct() Eliminates all duplicated values from the current result.
EObjectQueryStepBuilder<S>	eAllContents() Navigates from an EObject to its eAllContents.
EObjectQueryStepBuilder<S>	eContainer() Navigates from an EObject to its eContainer.
EObjectQueryStepBuilder<S>	eContents() Navigates from an EObject to its eContents.
UntypedQueryStepBuilder<S,java.lang.Object>	eGet(org.eclipse.emf.ecore.EAttribute eAttribute) Performs a EObject.eGet(EStructuralFeature) operation on all EObjects in the current result and forwards the result of this method.
EObjectQueryStepBuilder<S>	eGet(org.eclipse.emf.ecore.EReference eReference) Performs a EObject.eGet(EStructuralFeature) operation on all EObjects in the current result and forwards the result of this method.
UntypedQueryStepBuilder<S,java.lang.Object>	eGet(java.lang.String eStructuralFeatureName) Performs a EObject.eGet(EStructuralFeature) operation on all EObjects in the current result and forwards the result of this method.
EObjectQueryStepBuilder<S>	eGetInverse(org.eclipse.emf.ecore.EReference eReference) Navigates along the incoming EReferences of the given type and forwards the EObjects on the other end of the reference.
EObjectQueryStepBuilder<S>	eGetInverse(java.lang.String referenceName) Navigates along the incoming EReferences with the given name and forwards the EObjects on the other end of the reference.
EObjectQueryStepBuilder<S>	except(java.util.Set<?> elementsToExclude) Removes all elements in the given set from the stream.
EObjectQueryStepBuilder<S>	except(java.lang.String stepName) Removes all elements from the given named step from this step.
EObjectQueryStepBuilder<S>	filter(java.util.function.Predicate<org.eclipse.emf.ecore.EObject> predicate) Applies the given filter predicate to all elements in the current result.
<T> UntypedQueryStepBuilder<S,T>	flatMap(java.util.function.Function<org.eclipse.emf.ecore.EObject,java.util.Iterator<T>> function) Uses the given function to map each element to an iterator of output elements.
TraversalChainElement	getPrevious()
EObjectQueryStepBuilder<S>	has(org.eclipse.emf.ecore.EStructuralFeature eStructuralFeature, java.lang.Object value) Filters all EObjects in the result set that have the given feature set to the given value.
EObjectQueryStepBuilder<S>	has(java.lang.String eStructuralFeatureName, java.lang.Object value) Filters all EObjects in the result set that have the given feature set to the given value.
EObjectQueryStepBuilder<S>	isInstanceOf(org.eclipse.emf.ecore.EClass eClass) Filters all EObjects that are an instance of the given EClass.
EObjectQueryStepBuilder<S>	isInstanceOf(org.eclipse.emf.ecore.EClass eClass, boolean allowSubclasses) Filters all EObjects that are an instance of the given EClass.
EObjectQueryStepBuilder<S>	isInstanceOf(java.lang.String eClassName) Filters all EObjects that are a (direct or indirect) instance of an EClass with the given name.
EObjectQueryStepBuilder<S>	isInstanceOf(java.lang.String eClassName, boolean allowSubclasses) Filters all EObjects that are a (direct or indirect) instance of an EClass with the given name.
EObjectQueryStepBuilder<S>	limit(long limit) Limits the number of elements in the result set to the given number.
<T> UntypedQueryStepBuilder<S,T>	map(java.util.function.Function<org.eclipse.emf.ecore.EObject,T> function) Uses the given function to map each element from the current result set to a new element.
EObjectQueryStepBuilder<S>	named(java.lang.String name) Assigns the given name to this QueryStepBuilder.
EObjectQueryStepBuilder<S>	not(QueryStepBuilder<org.eclipse.emf.ecore.EObject,?> subquery)
EObjectQueryStepBuilder<S>	notNull() Filters out and discards all null values from the current result set.
EObjectQueryStepBuilder<S>	or(QueryStepBuilder<org.eclipse.emf.ecore.EObject,?>... subqueries)
EObjectQueryStepBuilder<S>	orderBy(java.util.Comparator<org.eclipse.emf.ecore.EObject> comparator) Sorts the current result set by applying the given comparator.
EObjectQueryStepBuilder<S>	orderBy(org.eclipse.emf.ecore.EAttribute eAttribute, Order order)
protected QueryStepBuilderInternal<S,org.eclipse.emf.ecore.EObject>	reifyEObjects()
void	setPrevious(TraversalChainElement previous)
java.util.Iterator<org.eclipse.emf.ecore.EObject>	toIterator() Creates an iterator over the elements in this query and returns it.
java.util.List<org.eclipse.emf.ecore.EObject>	toList() Calculates the result of this query and returns it as a List.
java.util.Set<org.eclipse.emf.ecore.EObject>	toSet() Calculates the result set of this query and returns it.
java.util.stream.Stream<org.eclipse.emf.ecore.EObject>	toStream() Converts this query into a Stream.
UntypedQueryStepBuilder<S,java.lang.Object>	union(QueryStepBuilder<org.eclipse.emf.ecore.EObject,?>... subqueries)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.chronos.chronosphere.api.query.EObjectQueryStepBuilder

closure

Methods inherited from interface org.chronos.chronosphere.impl.query.traversal.TraversalTransformer

identity, transformTraversal

Constructor Detail

EObjectQueryStepBuilderImpl

public EObjectQueryStepBuilderImpl(TraversalChainElement previous)

Method Detail

orderBy

public EObjectQueryStepBuilder<S> orderBy(java.util.Comparator<org.eclipse.emf.ecore.EObject> comparator)

Description copied from interface: QueryStepBuilder

Sorts the current result set by applying the given comparator.

This method requires full resolution of all elements and is therefore non-lazy.

Specified by:

orderBy in interface EObjectQueryStepBuilder<S>

Specified by:

orderBy in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Parameters:

comparator - The comparator to use. Must not be null.

Returns:

The query builder, for method chaining. Never null.

orderBy

public EObjectQueryStepBuilder<S> orderBy(org.eclipse.emf.ecore.EAttribute eAttribute,
                                          Order order)

Specified by:

orderBy in interface EObjectQueryStepBuilder<S>

distinct

public EObjectQueryStepBuilder<S> distinct()

Description copied from interface: QueryStepBuilder

Eliminates all duplicated values from the current result.

This method is lazy, but requires to keep track of the "already encountered" elements in a set. Therefore, RAM consumption on this method may be high if it is applied on very large result sets.

Specified by:

distinct in interface EObjectQueryStepBuilder<S>

Specified by:

distinct in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Returns:

The distinct step builder, for method chaining. Never null.

map

public <T> UntypedQueryStepBuilder<S,T> map(java.util.function.Function<org.eclipse.emf.ecore.EObject,T> function)

Description copied from interface: QueryStepBuilder

Uses the given function to map each element from the current result set to a new element.

Specified by:

map in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Parameters:

function - The mapping function to apply. Must not be null. Should be idempotent and side-effect free.

Returns:

The query step builder, for method chaining. Never null.

flatMap

public <T> UntypedQueryStepBuilder<S,T> flatMap(java.util.function.Function<org.eclipse.emf.ecore.EObject,java.util.Iterator<T>> function)

Description copied from interface: QueryStepBuilder

Uses the given function to map each element to an iterator of output elements. These output iterators will be concatenated and forwarded.

Specified by:

flatMap in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Parameters:

function - The map function to apply. Must not be null. Should be idempotent and side-effect free.

Returns:

The query step builder, for method chaining. Never null.

toSet

public java.util.Set<org.eclipse.emf.ecore.EObject> toSet()

Description copied from interface: QueryStepBuilder

Calculates the result set of this query and returns it.

Please note that iterating over the result set via QueryStepBuilder.toIterator() is in general faster and consumes less RAM than first converting the result into a set.

Specified by:

toSet in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Returns:

The result set. Never null. May be empty.

toList

public java.util.List<org.eclipse.emf.ecore.EObject> toList()

Description copied from interface: QueryStepBuilder

Calculates the result of this query and returns it as a List.

Please note that iterating over the result via QueryStepBuilder.toIterator() is in general faster and consumes less RAM than first converting the result into a list.

Specified by:

toList in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Returns:

The result list. Never null. May be empty.

toIterator

public java.util.Iterator<org.eclipse.emf.ecore.EObject> toIterator()

Description copied from interface: QueryStepBuilder

Creates an iterator over the elements in this query and returns it.

Specified by:

toIterator in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Returns:

The iterator over the resulting elements. May be empty, but never null.

toStream

public java.util.stream.Stream<org.eclipse.emf.ecore.EObject> toStream()

Description copied from interface: QueryStepBuilder

Converts this query into a Stream.

Specified by:

toStream in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Returns:

The stream representation of this query.

count

public long count()

Description copied from interface: QueryStepBuilder

Counts the number of elements in the current result, and returns that count.

Specified by:

count in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Returns:

The count. Never negative, may be zero.

limit

public EObjectQueryStepBuilder<S> limit(long limit)

Description copied from interface: QueryStepBuilder

Limits the number of elements in the result set to the given number.

Please note that the order of elements is in general arbitrary. Therefore, usually a QueryStepBuilder.limit(long) is preceded by a QueryStepBuilder.orderBy(Comparator).

Specified by:

limit in interface EObjectQueryStepBuilder<S>

Specified by:

limit in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Parameters:

limit - The limit to apply. Must not be negative.

Returns:

The query builder, for method chaining. Never null.

notNull

public EObjectQueryStepBuilder<S> notNull()

Description copied from interface: QueryStepBuilder

Filters out and discards all null values from the current result set.

This is the same as:

 query.filter(element -> element != null)
 

Specified by:

notNull in interface EObjectQueryStepBuilder<S>

Specified by:

notNull in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Returns:

The query step builder, for method chaining. Never null.

See Also:

QueryStepBuilder.filter(Predicate)

has

public EObjectQueryStepBuilder<S> has(java.lang.String eStructuralFeatureName,
                                      java.lang.Object value)

Description copied from interface: EObjectQueryStepBuilder

Filters all EObjects in the result set that have the given feature set to the given value.

Any EObject that is an instance of an EClass which does not define any EAttribute or EReference with the given name will be discarded and filtered out.

For determining the feature, EClass.getEStructuralFeature(String) is used per EObject individually.

The value will be compared via Objects.equals(Object, Object).

Specified by:

has in interface EObjectQueryStepBuilder<S>

Parameters:

eStructuralFeatureName - The name of the EStructuralFeature to filter by. Must not be null.

value - The value to filter by. May be null.

Returns:

The query builder, for method chaining. Never null.

has

public EObjectQueryStepBuilder<S> has(org.eclipse.emf.ecore.EStructuralFeature eStructuralFeature,
                                      java.lang.Object value)

Description copied from interface: EObjectQueryStepBuilder

Filters all EObjects in the result set that have the given feature set to the given value.

Any EObject that belongs to an EClass that does not support the given feature will be discarded and filtered out.

The value will be compared via Objects.equals(Object, Object).

Specified by:

has in interface EObjectQueryStepBuilder<S>

Parameters:

eStructuralFeature - The feature to filter by. Must not be null.

value - The value to filter by. Must not be null.

Returns:

The query builder, for method chaining. Never null.

isInstanceOf

public EObjectQueryStepBuilder<S> isInstanceOf(org.eclipse.emf.ecore.EClass eClass)

Description copied from interface: EObjectQueryStepBuilder

Filters all EObjects that are an instance of the given EClass.

This method also considers polymorphism, i.e. instances of Sub-EClasses will pass this filter as well.

This operation is null-safe. Any null values will be discarded and filtered out.

Specified by:

isInstanceOf in interface EObjectQueryStepBuilder<S>

Parameters:

eClass - The EClass to filter by. Must not be null.

Returns:

The query builder, for method chaining. Never null.

isInstanceOf

public EObjectQueryStepBuilder<S> isInstanceOf(org.eclipse.emf.ecore.EClass eClass,
                                               boolean allowSubclasses)

Description copied from interface: EObjectQueryStepBuilder

Filters all EObjects that are an instance of the given EClass.

This operation is null-safe. Any null values will be discarded and filtered out.

Specified by:

isInstanceOf in interface EObjectQueryStepBuilder<S>

Parameters:

eClass - The EClass to filter by. Must not be null.

allowSubclasses - Whether or not subclasses are allowed. If false, any EObject that passes the filter must be a direct instance of the given EClass. If true, EObjects that pass the filter can be a direct or transitive instance of the given EClass.

Returns:

The query builder, for method chaining. Never null.

isInstanceOf

public EObjectQueryStepBuilder<S> isInstanceOf(java.lang.String eClassName)

Description copied from interface: EObjectQueryStepBuilder

Filters all EObjects that are a (direct or indirect) instance of an EClass with the given name.

This operation is null-safe. Any null values will be discarded and filtered out.

Specified by:

isInstanceOf in interface EObjectQueryStepBuilder<S>

Parameters:

eClassName - The name of the EClass to search for. Must not be null.

Returns:

The query builder, for method chaining. Never null.

isInstanceOf

public EObjectQueryStepBuilder<S> isInstanceOf(java.lang.String eClassName,
                                               boolean allowSubclasses)

Description copied from interface: EObjectQueryStepBuilder

Filters all EObjects that are a (direct or indirect) instance of an EClass with the given name.

This operation is null-safe. Any null values will be discarded and filtered out.

Specified by:

isInstanceOf in interface EObjectQueryStepBuilder<S>

Parameters:

eClassName - The name of the EClass to search for. Must not be null.

allowSubclasses - Whether or not subclasses are allowed. If false, any EObject that passes the filter must be a direct instance of the given EClass. If true, EObjects that pass the filter can be a direct or transitive instance of the given EClass.

Returns:

The query builder, for method chaining. Never null.

eGet

public UntypedQueryStepBuilder<S,java.lang.Object> eGet(java.lang.String eStructuralFeatureName)

Description copied from interface: EObjectQueryStepBuilder

Performs a EObject.eGet(EStructuralFeature) operation on all EObjects in the current result and forwards the result of this method.

If a given EObject does not have the EStructuralFeature set (i.e. EObject.eIsSet(EStructuralFeature) returns false), then no value will be passed onwards. In any other case, the returned value is passed onwards, even if that value is null.

Specified by:

eGet in interface EObjectQueryStepBuilder<S>

Parameters:

eStructuralFeatureName - The name of the EStructuralFeature to get the value(s) for. Must not be null.

Returns:

The query builder, for method chaining. Never null.

eGet

public EObjectQueryStepBuilder<S> eGet(org.eclipse.emf.ecore.EReference eReference)

Description copied from interface: EObjectQueryStepBuilder

Performs a EObject.eGet(EStructuralFeature) operation on all EObjects in the current result and forwards the result of this method.

If a given EObject does not have the EStructuralFeature set (i.e. EObject.eIsSet(EStructuralFeature) returns false), then no value will be passed onwards. In any other case, the returned value is passed onwards, even if that value is null.

Specified by:

eGet in interface EObjectQueryStepBuilder<S>

Parameters:

eReference - The EReference to get the value(s) for. Must not be null.

Returns:

The query builder, for method chaining. Never null.

eGetInverse

public EObjectQueryStepBuilder<S> eGetInverse(org.eclipse.emf.ecore.EReference eReference)

Description copied from interface: EObjectQueryStepBuilder

Navigates along the incoming EReferences of the given type and forwards the EObjects on the other end of the reference.

Specified by:

eGetInverse in interface EObjectQueryStepBuilder<S>

Parameters:

eReference - The EReference to follow backwards. Must not be null.

Returns:

The query builder, for method chaining. Never null.

eGetInverse

public EObjectQueryStepBuilder<S> eGetInverse(java.lang.String referenceName)

Description copied from interface: EObjectQueryStepBuilder

Navigates along the incoming EReferences with the given name and forwards the EObjects on the other end of the reference.

Specified by:

eGetInverse in interface EObjectQueryStepBuilder<S>

Parameters:

referenceName - The name of the reference to follow backwards. Must not be null.

Returns:

The query builder, for method chaining. Never null.

eGet

public UntypedQueryStepBuilder<S,java.lang.Object> eGet(org.eclipse.emf.ecore.EAttribute eAttribute)

Description copied from interface: EObjectQueryStepBuilder

Performs a EObject.eGet(EStructuralFeature) operation on all EObjects in the current result and forwards the result of this method.

If a given EObject does not have the EStructuralFeature set (i.e. EObject.eIsSet(EStructuralFeature) returns false), then no value will be passed onwards. In any other case, the returned value is passed onwards, even if that value is null.

Specified by:

eGet in interface EObjectQueryStepBuilder<S>

Parameters:

eAttribute - The EAttribute to get the value(s) for. Must not be null.

Returns:

The query builder, for method chaining. Never null.

eContainer

public EObjectQueryStepBuilder<S> eContainer()

Description copied from interface: EObjectQueryStepBuilder

Navigates from an EObject to its eContainer.

Specified by:

eContainer in interface EObjectQueryStepBuilder<S>

Returns:

The query builder, for method chaining. Never null.

eContents

public EObjectQueryStepBuilder<S> eContents()

Description copied from interface: EObjectQueryStepBuilder

Navigates from an EObject to its eContents.

Specified by:

eContents in interface EObjectQueryStepBuilder<S>

Returns:

The query builder, for method chaining. Never null.

eAllContents

public EObjectQueryStepBuilder<S> eAllContents()

Description copied from interface: EObjectQueryStepBuilder

Navigates from an EObject to its eAllContents.

Specified by:

eAllContents in interface EObjectQueryStepBuilder<S>

Returns:

The query builder, for method chaining. Never null.

allReferencingEObjects

public EObjectQueryStepBuilder<S> allReferencingEObjects()

Description copied from interface: EObjectQueryStepBuilder

Navigates from an EObject to all other EObjects that reference it.

This means walking backwards all EReference instances that have the current EObject as target. This method will include the eContainer.

Specified by:

allReferencingEObjects in interface EObjectQueryStepBuilder<S>

Returns:

The query builder, for method chaining. Never null.

named

public EObjectQueryStepBuilder<S> named(java.lang.String name)

Description copied from interface: QueryStepBuilder

Assigns the given name to this QueryStepBuilder.

Note that only the step is named. When coming back to this step, the query result may be different than it was when it was first reached, depending on the traversal.

Specified by:

named in interface EObjectQueryStepBuilder<S>

Specified by:

named in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Parameters:

name - The name of the step. Must not be null. Must be unique within the query.

Returns:

The named step, for method chaining. Never null.

See Also:

QueryStepBuilder.back(String)

back

public UntypedQueryStepBuilder<S,java.lang.Object> back(java.lang.String stepName)

Description copied from interface: QueryStepBuilder

Exits the current traversal state and goes back to a named step, or a named set.

Specified by:

back in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Parameters:

stepName - The name of the step to go back to. Must not be null, must refer to a named step.

Returns:

The step after going back, for method chaining. Never null.

See Also:

QueryStepBuilder.named(String)

except

public EObjectQueryStepBuilder<S> except(java.lang.String stepName)

Description copied from interface: QueryStepBuilder

Removes all elements from the given named step from this step.

Specified by:

except in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Parameters:

stepName - The name of the step. Must not be null, must refer to a named step.

Returns:

The step after removing the elements in the given named step, for method chaining. Never null.

except

public EObjectQueryStepBuilder<S> except(java.util.Set<?> elementsToExclude)

Description copied from interface: QueryStepBuilder

Removes all elements in the given set from the stream.

Specified by:

except in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Parameters:

elementsToExclude - The elements to remove. Must not be null.

Returns:

The step after removing the elements in the given set, for method chaining. Never null.

union

public UntypedQueryStepBuilder<S,java.lang.Object> union(QueryStepBuilder<org.eclipse.emf.ecore.EObject,?>... subqueries)

Specified by:

union in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

and

public EObjectQueryStepBuilder<S> and(QueryStepBuilder<org.eclipse.emf.ecore.EObject,?>... subqueries)

Specified by:

and in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

or

public EObjectQueryStepBuilder<S> or(QueryStepBuilder<org.eclipse.emf.ecore.EObject,?>... subqueries)

Specified by:

or in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

not

public EObjectQueryStepBuilder<S> not(QueryStepBuilder<org.eclipse.emf.ecore.EObject,?> subquery)

Specified by:

not in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

filter

public EObjectQueryStepBuilder<S> filter(java.util.function.Predicate<org.eclipse.emf.ecore.EObject> predicate)

Description copied from interface: QueryStepBuilder

Applies the given filter predicate to all elements in the current result.

Specified by:

filter in interface EObjectQueryStepBuilder<S>

Specified by:

filter in interface QueryStepBuilder<S,org.eclipse.emf.ecore.EObject>

Parameters:

predicate - The predicate to apply. Must not be null. All elements for which the predicate function returns false will be filtered out and discarded.

Returns:

The query builder, for method chaining. Never null.

closure

public EObjectQueryStepBuilder<S> closure(org.eclipse.emf.ecore.EReference eReference,
                                          Direction direction)

Description copied from interface: EObjectQueryStepBuilder

Calculates the transitive closure of the current EObject that is created by repeatedly following the given (outgoing) EReference.

This method is safe to use in models that contain cyclic paths. Every EObject in the closure will only be returned once, even if multiple paths lead to it.

The EObject which is used to start the closure will not be part of the closure.

If an EObject is either of an EClass that does not own the given EReference, or the EObject itself does not have an instance of the EReference, the closure ends at this EObject.

Specified by:

closure in interface EObjectQueryStepBuilder<S>

Parameters:

eReference - The EReference to follow repeatedly. Must not be null.

direction - The direction to follow when calculating the closure. Must not be null.

Returns:

The query builder, for method chaining. Never null.

getPrevious

public TraversalChainElement getPrevious()

Specified by:

getPrevious in interface QueryStepBuilderInternal<S,org.eclipse.emf.ecore.EObject>

setPrevious

public void setPrevious(TraversalChainElement previous)

Specified by:

setPrevious in interface QueryStepBuilderInternal<S,org.eclipse.emf.ecore.EObject>

reifyEObjects

protected QueryStepBuilderInternal<S,org.eclipse.emf.ecore.EObject> reifyEObjects()