com.tinkerpop.gremlin.process.util

Class TraversalHelper

java.lang.Object

com.tinkerpop.gremlin.process.util.TraversalHelper

public class TraversalHelper
extends java.lang.Object

Author:

Marko A. Rodriguez (http://markorodriguez.com)

Constructor Summary

Constructors

Constructor and Description
TraversalHelper()

Method Summary

Modifier and Type	Method and Description
static <S> void	addToCollection(java.util.Collection<S> collection, S s, long bulk)
static <S> void	addToCollectionUnrollIterator(java.util.Collection<S> collection, S s, long bulk)
static boolean	areEqual(java.util.Iterator a, java.util.Iterator b)
static <S,E> Step<?,E>	getEnd(Traversal.Admin<S,E> traversal)
static java.util.List<java.lang.String>	getLabelsUpTo(Step<?,?> step, Traversal.Admin<?,?> traversal)
static <S> java.util.Optional<S>	getLastStepOfAssignableClass(java.lang.Class<S> stepClass, Traversal.Admin<?,?> traversal)
static java.util.Set<TraverserRequirement>	getRequirements(Traversal.Admin<?,?> traversal)
static Traversal<?,?>	getRootTraversal(Traversal.Admin<?,?> traversal)
static java.lang.String	getShortName(Step step, int maxLength) Returns the name of step truncated to maxLength.
static <S,E> Step<S,?>	getStart(Traversal.Admin<S,E> traversal)
static <S,E> Step<S,E>	getStepById(java.lang.String id, Traversal.Admin<?,?> traversal)
static <S,E> Step<S,E>	getStepByLabel(java.lang.String label, Traversal.Admin<?,?> traversal)
static <S> java.util.List<S>	getStepsOfAssignableClass(java.lang.Class<S> stepClass, Traversal.Admin<?,?> traversal)
static <S> java.util.List<S>	getStepsOfAssignableClassRecurssively(java.lang.Class<S> stepClass, Traversal.Admin<?,?> traversal)
static <S> java.util.List<S>	getStepsOfClass(java.lang.Class<S> stepClass, Traversal.Admin<?,?> traversal)
static java.util.List<Step<?,?>>	getStepsUpTo(Step<?,?> step, Traversal.Admin<?,?> traversal)
static boolean	hasLabel(java.lang.String label, Traversal.Admin<?,?> traversal)
static boolean	hasStepOfAssignableClass(java.lang.Class superClass, Traversal.Admin<?,?> traversal)
static boolean	hasStepOfClass(java.lang.Class stepClass, Traversal.Admin<?,?> traversal)
static <S,E> void	insertAfterStep(Step<S,E> insertStep, Step<?,S> beforeStep, Traversal.Admin<?,?> traversal)
static <S,E> void	insertBeforeStep(Step<S,E> insertStep, Step<E,?> afterStep, Traversal.Admin<?,?> traversal)
static <S,E> Step<?,E>	insertTraversal(int insertIndex, Traversal.Admin<S,E> insertTraversal, Traversal.Admin<?,?> traversal)
static <S,E> Step<?,E>	insertTraversal(Step<?,S> previousStep, Traversal.Admin<S,E> insertTraversal, Traversal.Admin<?,?> traversal)
static boolean	isReversible(Traversal.Admin<?,?> traversal)
static java.lang.String	makeStepString(Step<?,?> step, java.lang.Object... arguments)
static java.lang.String	makeTraversalString(Traversal.Admin<?,?> traversal)
static void	reIdSteps(StepPosition stepPosition, Traversal.Admin<?,?> traversal)
static void	reLinkSteps(Traversal.Admin<?,?> traversal)
static <S,E> void	replaceStep(Step<S,E> removeStep, Step<S,E> insertStep, Traversal.Admin<?,?> traversal)

Methods inherited from class java.lang.Object

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

Constructor Detail

TraversalHelper

public TraversalHelper()

Method Detail

isReversible

public static boolean isReversible(Traversal.Admin<?,?> traversal)

getStepByLabel

public static <S,E> Step<S,E> getStepByLabel(java.lang.String label,
                                             Traversal.Admin<?,?> traversal)

getStepById

public static <S,E> Step<S,E> getStepById(java.lang.String id,
                                          Traversal.Admin<?,?> traversal)

hasLabel

public static boolean hasLabel(java.lang.String label,
                               Traversal.Admin<?,?> traversal)

getLabelsUpTo

public static java.util.List<java.lang.String> getLabelsUpTo(Step<?,?> step,
                                                             Traversal.Admin<?,?> traversal)

getStepsUpTo

public static java.util.List<Step<?,?>> getStepsUpTo(Step<?,?> step,
                                                     Traversal.Admin<?,?> traversal)

getStart

public static <S,E> Step<S,?> getStart(Traversal.Admin<S,E> traversal)

getEnd

public static <S,E> Step<?,E> getEnd(Traversal.Admin<S,E> traversal)

areEqual

public static boolean areEqual(java.util.Iterator a,
                               java.util.Iterator b)

insertTraversal

public static <S,E> Step<?,E> insertTraversal(int insertIndex,
                                              Traversal.Admin<S,E> insertTraversal,
                                              Traversal.Admin<?,?> traversal)

insertTraversal

public static <S,E> Step<?,E> insertTraversal(Step<?,S> previousStep,
                                              Traversal.Admin<S,E> insertTraversal,
                                              Traversal.Admin<?,?> traversal)

insertBeforeStep

public static <S,E> void insertBeforeStep(Step<S,E> insertStep,
                                          Step<E,?> afterStep,
                                          Traversal.Admin<?,?> traversal)

insertAfterStep

public static <S,E> void insertAfterStep(Step<S,E> insertStep,
                                         Step<?,S> beforeStep,
                                         Traversal.Admin<?,?> traversal)

replaceStep

public static <S,E> void replaceStep(Step<S,E> removeStep,
                                     Step<S,E> insertStep,
                                     Traversal.Admin<?,?> traversal)

reLinkSteps

public static void reLinkSteps(Traversal.Admin<?,?> traversal)

makeStepString

public static java.lang.String makeStepString(Step<?,?> step,
                                              java.lang.Object... arguments)

makeTraversalString

public static java.lang.String makeTraversalString(Traversal.Admin<?,?> traversal)

getStepsOfClass

public static <S> java.util.List<S> getStepsOfClass(java.lang.Class<S> stepClass,
                                                    Traversal.Admin<?,?> traversal)

getStepsOfAssignableClass

public static <S> java.util.List<S> getStepsOfAssignableClass(java.lang.Class<S> stepClass,
                                                              Traversal.Admin<?,?> traversal)

getLastStepOfAssignableClass

public static <S> java.util.Optional<S> getLastStepOfAssignableClass(java.lang.Class<S> stepClass,
                                                                     Traversal.Admin<?,?> traversal)

getStepsOfAssignableClassRecurssively

public static <S> java.util.List<S> getStepsOfAssignableClassRecurssively(java.lang.Class<S> stepClass,
                                                                          Traversal.Admin<?,?> traversal)

hasStepOfClass

public static boolean hasStepOfClass(java.lang.Class stepClass,
                                     Traversal.Admin<?,?> traversal)

hasStepOfAssignableClass

public static boolean hasStepOfAssignableClass(java.lang.Class superClass,
                                               Traversal.Admin<?,?> traversal)

addToCollection

public static <S> void addToCollection(java.util.Collection<S> collection,
                                       S s,
                                       long bulk)

addToCollectionUnrollIterator

public static <S> void addToCollectionUnrollIterator(java.util.Collection<S> collection,
                                                     S s,
                                                     long bulk)

getShortName

public static java.lang.String getShortName(Step step,
                                            int maxLength)

Returns the name of step truncated to maxLength. An ellipses is appended when the name exceeds maxLength.

Parameters:

step -

maxLength - Includes the 3 "..." characters that will be appended when the length of the name exceeds maxLength.

Returns:

short step name.

getRequirements

public static java.util.Set<TraverserRequirement> getRequirements(Traversal.Admin<?,?> traversal)

reIdSteps

public static void reIdSteps(StepPosition stepPosition,
                             Traversal.Admin<?,?> traversal)

getRootTraversal

public static Traversal<?,?> getRootTraversal(Traversal.Admin<?,?> traversal)