org.jboss.dna.graph.query.model
Class EquiJoinCondition

java.lang.Object
  org.jboss.dna.graph.query.model.JoinCondition
      org.jboss.dna.graph.query.model.EquiJoinCondition

All Implemented Interfaces:

Serializable, LanguageObject, Visitable

@Immutable
public class EquiJoinCondition
extends JoinCondition

A join condition that tests whether a property on a node is equal to a property on another node. A node-tuple satisfies the constraint only if:

• the selector1Name node has a property named property1Name, and
• the selector2Name node has a property named property2Name, and
• the value of property property1Name is equal to the value of property property2Name

See Also:

Serialized Form

Constructor Summary

EquiJoinCondition(Column column1, Column column2)
Create an equi-join condition, given the columns.

EquiJoinCondition(SelectorName selector1Name, String property1Name, SelectorName selector2Name, String property2Name)
Create an equi-join condition, given the names of the selector and property for the left- and right-hand-side of the join.

Method Summary

void	accept(Visitor visitor) Accept the supplied visitor, which should call back to the visitor to complete the double-dispatch operation.
boolean	equals(Object obj)
String	getProperty1Name() Get the name of the property that appears on the left-side of the join.
String	getProperty2Name() Get the name of the property that appears on the left-side of the join.
SelectorName	getSelector1Name() Get the name of the selector that appears on the left-side of the join.
SelectorName	getSelector2Name() Get the name of the selector that appears on the right-side of the join.
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

EquiJoinCondition

public EquiJoinCondition(SelectorName selector1Name,
                         String property1Name,
                         SelectorName selector2Name,
                         String property2Name)

Create an equi-join condition, given the names of the selector and property for the left- and right-hand-side of the join.

Parameters:

selector1Name - the selector name appearing on the left-side of the join; never null

property1Name - the property name for the left-side of the join; never null

selector2Name - the selector name appearing on the right-side of the join; never null

property2Name - the property name for the right-side of the join; never null

EquiJoinCondition

public EquiJoinCondition(Column column1,
                         Column column2)

Create an equi-join condition, given the columns.

Parameters:

column1 - the column for the left-side of the join; never null

column2 - the column for the right-side of the join; never null

Method Detail

getSelector1Name

public final SelectorName getSelector1Name()

Get the name of the selector that appears on the left-side of the join.

Returns:

the selector name appearing on the left-side of the join; never null

getProperty1Name

public final String getProperty1Name()

Get the name of the property that appears on the left-side of the join.

Returns:

the property name for the left-side of the join; never null

getSelector2Name

public final SelectorName getSelector2Name()

Get the name of the selector that appears on the right-side of the join.

Returns:

the selector name appearing on the right-side of the join; never null

getProperty2Name

public final String getProperty2Name()

Get the name of the property that appears on the left-side of the join.

Returns:

the property name for the left-side of the join; never null

toString

public String toString()

Overrides:

toString in class Object

See Also:

Object.toString()

hashCode

public int hashCode()

Overrides:

hashCode in class Object

See Also:

Object.hashCode()

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

See Also:

Object.equals(java.lang.Object)

accept

public void accept(Visitor visitor)

Accept the supplied visitor, which should call back to the visitor to complete the double-dispatch operation.

Parameters:

visitor - the visitor; never null

See Also:

Visitable.accept(org.jboss.dna.graph.query.model.Visitor)