Package se.liu.ida.hefquin.engine.wrappers.lpg.query.impl.match

Class EdgeMatchClause

java.lang.Object

se.liu.ida.hefquin.engine.wrappers.lpg.query.impl.match.EdgeMatchClause

All Implemented Interfaces:

CypherExpression, MatchClause

public class EdgeMatchClause
extends Object
implements MatchClause

Represents a directed path match statement. Conditions on the labels of the nodes or edges, as well as over property values of nodes or edges are managed through the WHERE clause. For example MATCH (x)-[e]->(y)

Field Summary

Fields

Modifier and Type	Field	Description
protected final CypherVar	edge
protected final CypherVar	sourceNode
protected final CypherVar	targetNode

Constructor Summary

Constructors

Constructor	Description
EdgeMatchClause(CypherVar sourceNode, CypherVar edge, CypherVar targetNode)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
CypherVar	getEdge()
CypherVar	getSourceNode()
CypherVar	getTargetNode()
Set<CypherVar>	getVars()	Obtains the set of variables defined in the pattern
int	hashCode()
boolean	isRedundantWith(MatchClause match)	Checks if two match statements are redundant.
String	toString()
void	visit(CypherExpressionVisitor visitor)	accepts a CypherExpressionVisitor and propagates the visit recursively when required.

Methods inherited from class java.lang.Object

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

Field Details

sourceNode

protected final CypherVar sourceNode

targetNode

protected final CypherVar targetNode

edge

protected final CypherVar edge

Constructor Details

EdgeMatchClause

public EdgeMatchClause(CypherVar sourceNode,
 CypherVar edge,
 CypherVar targetNode)

Method Details

getSourceNode

public CypherVar getSourceNode()

getTargetNode

public CypherVar getTargetNode()

getEdge

public CypherVar getEdge()

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

isRedundantWith

public boolean isRedundantWith(MatchClause match)

Description copied from interface: MatchClause

Checks if two match statements are redundant. This can happen if they are exactly the same pattern, or if one is a node pattern and the other a path pattern that contains it. For instance, MATCH (x) is redundant with MATCH (x)-[y]->(z), MATCH (x), and MATCH (v)-[w]->(x). Note that this is not symmetric.

Specified by:

isRedundantWith in interface MatchClause

Parameters:

match - the other match clause to test

Returns:

true if the clauses are redundant, i.e., if both patterns share nodes

getVars

public Set<CypherVar> getVars()

Description copied from interface: MatchClause

Obtains the set of variables defined in the pattern

Specified by:

getVars in interface CypherExpression

Specified by:

getVars in interface MatchClause

Returns:

a set of CypherVar with the variables defined in the pattern For example, the object that represents the pattern MATCH (x)-[e]->(y) returns the set {x, e, y}.

visit

public void visit(CypherExpressionVisitor visitor)

Description copied from interface: CypherExpression

accepts a CypherExpressionVisitor and propagates the visit recursively when required.

Specified by:

visit in interface CypherExpression