org.openanzo.glitter.query.planning
Class TripleNode

java.lang.Object
  org.openanzo.glitter.query.planning.TripleNode

All Implemented Interfaces:

java.lang.Comparable<TripleNode>

public class TripleNode
extends java.lang.Object
implements java.lang.Comparable<TripleNode>

An TripleNode wraps a TriplePatternNode and allows for stateful comparison of two such nodes based on the number of free variables in each triple pattern.

Author:

lee

Constructor Summary

TripleNode(TriplePatternNode t)
Constructor.

Method Summary

void	buildMatch(TripleNode node) Checks this TripleNode against the supplied triple node to see if they contain variables in common.
boolean	checkMatch(Variable variable)
int	compareTo(TripleNode otherNode)
int	getMatchedVariableCount()
TriplePatternNode	getTriple()
int	getUnMatchedVariableCount()
int	getVarCount()
java.util.Collection<Variable>	getVariables()

Methods inherited from class java.lang.Object

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

Constructor Detail

TripleNode

public TripleNode(TriplePatternNode t)

Constructor.

Parameters:

t -

Method Detail

getTriple

public TriplePatternNode getTriple()

Returns:

The TriplePatternNode corresponding to this object.

getVarCount

public int getVarCount()

Returns:

The number of variables in this triple pattern

getVariables

public java.util.Collection<Variable> getVariables()

Returns:

The variables in this triple pattern

getMatchedVariableCount

public int getMatchedVariableCount()

Returns:

The number of variables that have been matched via calls to checkMatch(Variable)

getUnMatchedVariableCount

public int getUnMatchedVariableCount()

Returns:

The number of variables in this triple pattern not yet matched via calls to checkMatch(Variable)

buildMatch

public void buildMatch(TripleNode node)

Checks this TripleNode against the supplied triple node to see if they contain variables in common.

Parameters:

node -

checkMatch

public boolean checkMatch(Variable variable)

Parameters:

variable -

Returns:

true, if the given variable occurs in this triple pattern; false, otherwise

compareTo

public int compareTo(TripleNode otherNode)

Specified by:

compareTo in interface java.lang.Comparable<TripleNode>