Package org.eclipse.rdf4j.query.algebra.evaluation.iterator

Class PathIteration.ValuePair

java.lang.Object

org.eclipse.rdf4j.query.algebra.evaluation.iterator.PathIteration.ValuePair

All Implemented Interfaces:

Serializable, Iterable<Binding>, BindingSet, MutableBindingSet

Enclosing class:

PathIteration

public static class PathIteration.ValuePair
extends Object
implements MutableBindingSet

A specialized BingingSet that can only hold the start and end values of a Path. Minimizing unneeded memory use, and allows specialization in the sets required to answer this part of a query.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
ValuePair()
ValuePair(Value startValue, Value endValue)

Method Summary

Modifier and Type	Method	Description
void	addBinding(Binding binding)	Adds a binding to the binding set.
boolean	equals(Object obj)	Compares a BindingSet object to another object.
Binding	getBinding(String bindingName)	Gets the binding with the specified name from this BindingSet.
Set<String>	getBindingNames()	Gets the names of the bindings in this BindingSet.
Value	getEndValue()
Value	getStartValue()
Value	getValue(String bindingName)	Gets the value of the binding with the specified name from this BindingSet.
boolean	hasBinding(String bindingName)	Checks whether this BindingSet has a binding with the specified name.
int	hashCode()	The hash code of a binding is defined as the bit-wise XOR of the hash codes of its bindings:
Iterator<Binding>	iterator()	Creates an iterator over the bindings in this BindingSet.
void	setBinding(String name, Value value)
void	setBinding(Binding binding)
int	size()	Returns the number of bindings in this BindingSet.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.rdf4j.query.BindingSet

isEmpty

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface org.eclipse.rdf4j.query.MutableBindingSet

addBinding

Constructor Details

ValuePair

public ValuePair()

ValuePair

public ValuePair(Value startValue,
 Value endValue)

Method Details

getStartValue

public Value getStartValue()

Returns:

Returns the startValue.

getEndValue

public Value getEndValue()

Returns:

Returns the endValue.

hashCode

public int hashCode()

Description copied from interface: BindingSet

The hash code of a binding is defined as the bit-wise XOR of the hash codes of its bindings:

 int hashCode = 0;

 for (Binding binding : this) {
        hashCode ˆ= binding.getName().hashCode() ˆ binding.getValue().hashCode();
 }
 

Note: the calculated hash code intentionally does not depend on the order in which the bindings are iterated over.

Specified by:

hashCode in interface BindingSet

Overrides:

hashCode in class Object

Returns:

A hash code for the BindingSet.

equals

public boolean equals(Object obj)

Description copied from interface: BindingSet

Compares a BindingSet object to another object.

Specified by:

equals in interface BindingSet

Overrides:

equals in class Object

Parameters:

obj - The object to compare this binding to.

Returns:

true if the other object is an instance of BindingSet and it contains the same set of bindings (disregarding order), false otherwise.

iterator

public Iterator<Binding> iterator()

Description copied from interface: BindingSet

Creates an iterator over the bindings in this BindingSet. This only returns bindings with non-null values. An implementation is free to return the bindings in arbitrary order.

Specified by:

iterator in interface BindingSet

Specified by:

iterator in interface Iterable<Binding>

getBindingNames

public Set<String> getBindingNames()

Description copied from interface: BindingSet

Gets the names of the bindings in this BindingSet.

Specified by:

getBindingNames in interface BindingSet

Returns:

A set of binding names.

getBinding

public Binding getBinding(String bindingName)

Description copied from interface: BindingSet

Gets the binding with the specified name from this BindingSet.

Specified by:

getBinding in interface BindingSet

Parameters:

bindingName - The name of the binding.

Returns:

The binding with the specified name, or null if there is no such binding in this BindingSet.

hasBinding

public boolean hasBinding(String bindingName)

Description copied from interface: BindingSet

Checks whether this BindingSet has a binding with the specified name.

Specified by:

hasBinding in interface BindingSet

Parameters:

bindingName - The name of the binding.

Returns:

true if this BindingSet has a binding with the specified name, false otherwise.

getValue

public Value getValue(String bindingName)

Description copied from interface: BindingSet

Gets the value of the binding with the specified name from this BindingSet.

Specified by:

getValue in interface BindingSet

Parameters:

bindingName - The name of the binding.

Returns:

The value of the binding with the specified name, or null if there is no such binding in this BindingSet.

size

public int size()

Description copied from interface: BindingSet

Returns the number of bindings in this BindingSet.

Specified by:

size in interface BindingSet

Returns:

The number of bindings in this BindingSet.

addBinding

public void addBinding(Binding binding)

Description copied from interface: MutableBindingSet

Adds a binding to the binding set.

Specified by:

addBinding in interface MutableBindingSet

Parameters:

binding - The binding to add to the binding set.

setBinding

public void setBinding(String name,
 Value value)

Specified by:

setBinding in interface MutableBindingSet

setBinding

public void setBinding(Binding binding)

Specified by:

setBinding in interface MutableBindingSet