com.espertech.esper.client.soda

Class GroupByClause

java.lang.Object

com.espertech.esper.client.soda.GroupByClause

All Implemented Interfaces:

Serializable

public class GroupByClause
extends Object
implements Serializable

The group-by clause consists of a list of expressions that provide the grouped-by values.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
GroupByClause() Ctor - for use to create an expression tree, without child expression.
GroupByClause(Expression... expressions) Ctor.
GroupByClause(List<GroupByClauseExpression> groupByExpressions) Ctor.
GroupByClause(String... properties) Ctor.

Method Summary

Modifier and Type	Method and Description
static GroupByClause	create() Creates an empty group-by clause, to add to via add methods.
static GroupByClause	create(Expression... expressions) Creates a group-by clause from expressions.
static GroupByClause	create(String... properties) Creates a group-by clause from property names.
List<GroupByClauseExpression>	getGroupByExpressions() Returns the expressions providing the grouped-by values.
void	setGroupByExpressions(List<GroupByClauseExpression> groupByExpressions) Sets the expressions providing the grouped-by values.
void	toEPL(StringWriter writer) Renders the clause in textual representation.

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupByClause

public GroupByClause(List<GroupByClauseExpression> groupByExpressions)

Ctor.

Parameters:

groupByExpressions - expression list

GroupByClause

public GroupByClause()

Ctor - for use to create an expression tree, without child expression.

Use add methods to add child expressions to acts upon.

GroupByClause

public GroupByClause(String... properties)

Ctor.

Parameters:

properties - is a list of property names

GroupByClause

public GroupByClause(Expression... expressions)

Ctor.

Parameters:

expressions - list of expressions

Method Detail

create

public static GroupByClause create()

Creates an empty group-by clause, to add to via add methods.

Returns:

group-by clause

create

public static GroupByClause create(String... properties)

Creates a group-by clause from property names.

Parameters:

properties - a list of one or more property names

Returns:

group-by clause consisting of the properties

create

public static GroupByClause create(Expression... expressions)

Creates a group-by clause from expressions.

Parameters:

expressions - a list of one or more expressions

Returns:

group-by clause consisting of the expressions

getGroupByExpressions

public List<GroupByClauseExpression> getGroupByExpressions()

Returns the expressions providing the grouped-by values.

Returns:

expressions

setGroupByExpressions

public void setGroupByExpressions(List<GroupByClauseExpression> groupByExpressions)

Sets the expressions providing the grouped-by values.

Parameters:

groupByExpressions - is the expressions providing the grouped-by values

toEPL

public void toEPL(StringWriter writer)

Renders the clause in textual representation.

Parameters:

writer - to output to