Package com.gdblab.pathAlgebra.expressions

Class GroupByExpression

java.lang.Object

com.gdblab.pathAlgebra.expressions.GroupByExpression

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<GroupByExpression>

public class GroupByExpression
extends java.lang.Object
implements java.io.Serializable, java.lang.Comparable<GroupByExpression>

Group-by operator: γ_criterion(expression)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
GroupByCriterion	criterion
static Name	CRITERION	Name of the com.gdblab.pathAlgebra.expressions.GroupByExpression.criterion field.
PathExpression	expression
static Name	EXPRESSION	Name of the com.gdblab.pathAlgebra.expressions.GroupByExpression.expression field.
static Name	TYPE_	Name of the com.gdblab.pathAlgebra.expressions.GroupByExpression type.

Constructor Summary

Constructors

Constructor	Description
GroupByExpression(GroupByCriterion criterion, PathExpression expression)	Constructs an immutable GroupByExpression.

Method Summary

Modifier and Type	Method	Description
int	compareTo(GroupByExpression other)
boolean	equals(java.lang.Object other)
int	hashCode()
GroupByExpression	withCriterion(GroupByCriterion criterion)	Returns a copy of this GroupByExpression with criterion replaced.
GroupByExpression	withExpression(PathExpression expression)	Returns a copy of this GroupByExpression with expression replaced.

Methods inherited from class java.lang.Object

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

Field Detail

TYPE_

public static final Name TYPE_

Name of the com.gdblab.pathAlgebra.expressions.GroupByExpression type.

CRITERION

public static final Name CRITERION

Name of the com.gdblab.pathAlgebra.expressions.GroupByExpression.criterion field.

EXPRESSION

public static final Name EXPRESSION

Name of the com.gdblab.pathAlgebra.expressions.GroupByExpression.expression field.

criterion

public final GroupByCriterion criterion

expression

public final PathExpression expression

Constructor Detail

GroupByExpression

public GroupByExpression(GroupByCriterion criterion,
                         PathExpression expression)

Constructs an immutable GroupByExpression.

Method Detail

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

compareTo

public int compareTo(GroupByExpression other)

Specified by:

compareTo in interface java.lang.Comparable<GroupByExpression>

withCriterion

public GroupByExpression withCriterion(GroupByCriterion criterion)

Returns a copy of this GroupByExpression with criterion replaced.

withExpression

public GroupByExpression withExpression(PathExpression expression)

Returns a copy of this GroupByExpression with expression replaced.