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

Class NodeMatchClause

java.lang.Object

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

All Implemented Interfaces:

CypherExpression, MatchClause

public class NodeMatchClause
extends Object
implements MatchClause

Represents a node match clause For example, MATCH (x)

Field Summary

Fields

Modifier and Type	Field	Description
protected final CypherVar	node

Constructor Summary

Constructors

Constructor	Description
NodeMatchClause(CypherVar node)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
CypherVar	getNode()
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

node

protected final CypherVar node

Constructor Details

NodeMatchClause

public NodeMatchClause(CypherVar node)

Method Details

toString

public String toString()

Overrides:

toString 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

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getNode

public CypherVar getNode()