org.apache.tinkerpop.gremlin.process.traversal.step.util

Class Parameters

java.lang.Object

org.apache.tinkerpop.gremlin.process.traversal.step.util.Parameters

All Implemented Interfaces:

Serializable, Cloneable

public class Parameters
extends Object
implements Cloneable, Serializable

The parameters held by a Traversal.

Author:

Marko A. Rodriguez (http://markorodriguez.com), Stephen Mallette (http://stephen.genoprime.com)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static Parameters	EMPTY
protected Map<Object,List<Object>>	parameters
protected Set<String>	referencedLabels
protected List<Traversal.Admin<?,?>>	traversals A cached list of traversals that serve as parameter values.

Constructor Summary

Constructors

Constructor and Description
Parameters()

Method Summary

Modifier and Type	Method and Description
Parameters	clone()
boolean	contains(Object key) Checks for existence of key in parameter set.
boolean	contains(Object key, Object value) Checks for existence of a key and value in a parameter set.
<E> List<E>	get(Object key, Supplier<E> defaultValue) Gets the value of a key and if that key isn't present returns the default value from the Supplier.
<S,E> List<E>	get(Traverser.Admin<S> traverser, Object key, Supplier<E> defaultValue) Gets the list of values for a key, while resolving the values of any parameters that are Traversal objects.
<S> Object[]	getKeyValues(Traverser.Admin<S> traverser, Object... exceptKeys) Gets the array of keys/values of the parameters while resolving parameter values that contain Traversal instances.
Map<Object,List<Object>>	getRaw(Object... exceptKeys) Gets an immutable set of the parameters without evaluating them in the context of a Traverser as is done in getKeyValues(Traverser.Admin, Object...).
Set<String>	getReferencedLabels() Gets a list of all labels held in parameters that have a traversal as a value.
<S,E> List<Traversal.Admin<S,E>>	getTraversals() Gets all the Traversal.Admin objects in the map of parameters.
int	hashCode()
boolean	isEmpty() Check if the parameter set is empty.
Object	remove(Object key) Remove a key from the parameter set.
void	rename(Object oldKey, Object newKey) Renames a key in the parameter set.
void	set(TraversalParent parent, Object... keyValues) Set parameters given key/value pairs.
int	size() Returns the size of parameter set.
String	toString()

Methods inherited from class java.lang.Object

equals, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

EMPTY

public static final Parameters EMPTY

parameters

protected Map<Object,List<Object>> parameters

referencedLabels

protected Set<String> referencedLabels

traversals

protected List<Traversal.Admin<?,?>> traversals

A cached list of traversals that serve as parameter values. The list is cached on calls to set(TraversalParent, Object...) because when the parameter map is large the cost of iterating it repeatedly on the high number of calls to getTraversals() is great.

Constructor Detail

Parameters

public Parameters()

Method Detail

contains

public boolean contains(Object key)

Checks for existence of key in parameter set.

Parameters:

key - the key to check

Returns:

true if the key is present and false otherwise

contains

public boolean contains(Object key,
                        Object value)

Checks for existence of a key and value in a parameter set.

Parameters:

key - the key to check

value - the value to check

Returns:

true if the key and value are present and false otherwise

size

public int size()

Returns the size of parameter set.

Returns:

number of parameters (keys)

isEmpty

public boolean isEmpty()

Check if the parameter set is empty.

Returns:

true if the size is zero

rename

public void rename(Object oldKey,
                   Object newKey)

Renames a key in the parameter set.

Parameters:

oldKey - the key to rename

newKey - the new name of the key

get

public <S,E> List<E> get(Traverser.Admin<S> traverser,
                         Object key,
                         Supplier<E> defaultValue)

Gets the list of values for a key, while resolving the values of any parameters that are Traversal objects.

get

public <E> List<E> get(Object key,
                       Supplier<E> defaultValue)

Gets the value of a key and if that key isn't present returns the default value from the Supplier.

Parameters:

key - the key to retrieve

defaultValue - the default value generator which if null will return an empty list

remove

public Object remove(Object key)

Remove a key from the parameter set.

Parameters:

key - the key to remove

Returns:

the value of the removed key

getKeyValues

public <S> Object[] getKeyValues(Traverser.Admin<S> traverser,
                                 Object... exceptKeys)

Gets the array of keys/values of the parameters while resolving parameter values that contain Traversal instances.

getRaw

public Map<Object,List<Object>> getRaw(Object... exceptKeys)

Gets an immutable set of the parameters without evaluating them in the context of a Traverser as is done in getKeyValues(Traverser.Admin, Object...).

Parameters:

exceptKeys - keys to not include in the returned Map

set

public void set(TraversalParent parent,
                Object... keyValues)

Set parameters given key/value pairs.

getTraversals

public <S,E> List<Traversal.Admin<S,E>> getTraversals()

Gets all the Traversal.Admin objects in the map of parameters.

getReferencedLabels

public Set<String> getReferencedLabels()

Gets a list of all labels held in parameters that have a traversal as a value.

clone

public Parameters clone()

Overrides:

clone in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object