org.openanzo.glitter.rdf
Class Variable

java.lang.Object
  org.openanzo.glitter.rdf.Variable

All Implemented Interfaces:

java.lang.Comparable<Bindable>, Bindable, TriplePatternComponent

public class Variable
extends java.lang.Object
implements Bindable, TriplePatternComponent

A variable in a SPARQL query. The Variable class maintains a cache to reuse Variable objects sharing the same name.

Author:

lee

Method Summary

int	compareTo(Bindable o)
int	compareTo(TriplePatternComponent o) Compares to TriplePatternComponents for ordering.
static Variable	createVariable(java.lang.String variableName) Static factory method that uses an LRU cache to reuse Variable objects for variables with the same name.
boolean	equalName(Variable other) Determines variable equality solely based on the name, rather than object equality.
boolean	equals(java.lang.Object other)
java.lang.String	getName()
int	hashCode()
java.lang.String	toString()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Method Detail

createVariable

public static Variable createVariable(java.lang.String variableName)

Static factory method that uses an LRU cache to reuse Variable objects for variables with the same name.

Parameters:

variableName - name of variable

Returns:

Variable for given name

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getName

public java.lang.String getName()

Returns:

The name of the variable (excludes any leading ? or $ characters).

equals

public boolean equals(java.lang.Object other)

Specified by:

equals in interface TriplePatternComponent

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equalName

public boolean equalName(Variable other)

Determines variable equality solely based on the name, rather than object equality.

Parameters:

other - variable for which to determine equality

Returns:

true if other variable's name is equal to this variables name

compareTo

public int compareTo(Bindable o)

Specified by:

compareTo in interface java.lang.Comparable<Bindable>

compareTo

public int compareTo(TriplePatternComponent o)

Description copied from interface: TriplePatternComponent

Compares to TriplePatternComponents for ordering.

Specified by:

compareTo in interface TriplePatternComponent

Returns:

-1 if this comes before other; 0 if TriplePatternComponent.equals(Object) is true, and 1 otherwise.