com.espertech.esper.client.soda
Class SelectClause

java.lang.Object
  com.espertech.esper.client.soda.SelectClause

All Implemented Interfaces:

java.io.Serializable

public class SelectClause
extends java.lang.Object
implements java.io.Serializable

A select-clause consists of a list of selection elements (expressions, wildcard(s), stream wildcard and the like) and an optional stream selector.

See Also:

Serialized Form

Constructor Summary

	SelectClause() Ctor.
protected	SelectClause(StreamSelector streamSelector, java.util.List<SelectClauseElement> selectList) Ctor.

Method Summary

SelectClause	add(Expression expression) Adds an expression to the select clause.
SelectClause	add(Expression expression, java.lang.String asName) Adds an expression to the select clause and an "as"-asName for the column.
SelectClause	add(java.lang.String... propertyNames) Adds property names to be selected.
void	addElements(java.util.List<SelectClauseElement> selectClauseElements) Add a select expression element.
SelectClause	addStreamWildcard(java.lang.String streamName) Adds to the select-clause a stream wildcard selector (e.g.
SelectClause	addStreamWildcard(java.lang.String streamName, java.lang.String columnName) Adds to the select-clause a stream wildcard selector with column name (e.g.
SelectClause	addWildcard() Adds to the select-clause a wildcard selector (e.g.
SelectClause	addWithAsProvidedName(java.lang.String propertyName, java.lang.String asName) Adds a single property name and an "as"-asName for the column.
static SelectClause	create() Creates an empty select-clause to be added to via add methods.
static SelectClause	create(StreamSelector streamSelector) Creates an empty select-clause.
static SelectClause	create(StreamSelector streamSelector, java.lang.String... propertyNames) Creates a select-clause consisting of a list of property names.
static SelectClause	create(java.lang.String... propertyNames) Creates a select-clause consisting of a list of property names.
static SelectClause	createStreamWildcard(java.lang.String streamName) Creates a select-clause with a single stream wildcard selector (e.g.
static SelectClause	createWildcard() Creates a wildcard select-clause, additional expressions can still be added.
static SelectClause	createWildcard(StreamSelector streamSelector) Creates a wildcard select-clause, additional expressions can still be added.
SelectClause	distinct() Sets distinct to true.
SelectClause	distinct(boolean distinct) Sets distinct
boolean	getDistinct() Returns indicator whether distinct or not.
java.util.List<SelectClauseElement>	getSelectList() Returns the list of expressions in the select clause.
StreamSelector	getStreamSelector() Returns the stream selector.
boolean	isDistinct() Returns indicator whether distinct or not.
void	setDistinct(boolean distinct) Returns indicator whether distinct or not.
void	setSelectList(java.util.List<SelectClauseElement> selectList) Sets the list of expressions in the select clause.
void	setStreamSelector(StreamSelector streamSelector) Sets the stream selector.
SelectClause	streamSelector(StreamSelector streamSelector) Sets the stream selector.
void	toEPL(java.io.StringWriter writer, EPStatementFormatter formatter, boolean isTopLevel, boolean andDelete) 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

SelectClause

public SelectClause()

Ctor.

SelectClause

protected SelectClause(StreamSelector streamSelector,
                       java.util.List<SelectClauseElement> selectList)

Ctor.

Parameters:

streamSelector - selects the stream

selectList - is a list of elements in the select-clause

Method Detail

createWildcard

public static SelectClause createWildcard()

Creates a wildcard select-clause, additional expressions can still be added.

Returns:

select-clause

create

public static SelectClause create()

Creates an empty select-clause to be added to via add methods.

Returns:

select-clause

create

public static SelectClause create(java.lang.String... propertyNames)

Creates a select-clause consisting of a list of property names.

Parameters:

propertyNames - is the names of properties to select

Returns:

select-clause

createStreamWildcard

public static SelectClause createStreamWildcard(java.lang.String streamName)

Creates a select-clause with a single stream wildcard selector (e.g. select streamName.* from MyStream as streamName)

Parameters:

streamName - is the name given to a stream

Returns:

select-clause

createWildcard

public static SelectClause createWildcard(StreamSelector streamSelector)

Creates a wildcard select-clause, additional expressions can still be added.

Parameters:

streamSelector - can be used to select insert or remove streams

Returns:

select-clause

create

public static SelectClause create(StreamSelector streamSelector)

Creates an empty select-clause.

Parameters:

streamSelector - can be used to select insert or remove streams

Returns:

select-clause

create

public static SelectClause create(StreamSelector streamSelector,
                                  java.lang.String... propertyNames)

Creates a select-clause consisting of a list of property names.

Parameters:

propertyNames - is the names of properties to select

streamSelector - can be used to select insert or remove streams

Returns:

select-clause

add

public SelectClause add(java.lang.String... propertyNames)

Adds property names to be selected.

Parameters:

propertyNames - is a list of property names to add

Returns:

clause

addWithAsProvidedName

public SelectClause addWithAsProvidedName(java.lang.String propertyName,
                                          java.lang.String asName)

Adds a single property name and an "as"-asName for the column.

Parameters:

propertyName - name of property

asName - is the "as"-asName for the column

Returns:

clause

add

public SelectClause add(Expression expression)

Adds an expression to the select clause.

Parameters:

expression - to add

Returns:

clause

add

public SelectClause add(Expression expression,
                        java.lang.String asName)

Adds an expression to the select clause and an "as"-asName for the column.

Parameters:

expression - to add

asName - is the "as"-provided for the column

Returns:

clause

getSelectList

public java.util.List<SelectClauseElement> getSelectList()

Returns the list of expressions in the select clause.

Returns:

list of expressions with column names

addStreamWildcard

public SelectClause addStreamWildcard(java.lang.String streamName)

Adds to the select-clause a stream wildcard selector (e.g. select streamName.* from MyStream as streamName)

Parameters:

streamName - is the name given to a stream

Returns:

select-clause

addWildcard

public SelectClause addWildcard()

Adds to the select-clause a wildcard selector (e.g. select * from MyStream as streamName)

Returns:

select-clause

addStreamWildcard

public SelectClause addStreamWildcard(java.lang.String streamName,
                                      java.lang.String columnName)

Adds to the select-clause a stream wildcard selector with column name (e.g. select streamName.* as colName from MyStream as streamName)

Parameters:

streamName - is the name given to a stream

columnName - the name given to the column

Returns:

select-clause

setStreamSelector

public void setStreamSelector(StreamSelector streamSelector)

Sets the stream selector.

Parameters:

streamSelector - stream selector to set

streamSelector

public SelectClause streamSelector(StreamSelector streamSelector)

Sets the stream selector.

Parameters:

streamSelector - stream selector to set

Returns:

select clause

getStreamSelector

public StreamSelector getStreamSelector()

Returns the stream selector.

Returns:

stream selector

setSelectList

public void setSelectList(java.util.List<SelectClauseElement> selectList)

Sets the list of expressions in the select clause.

Parameters:

selectList - list of expressions with column names

addElements

public void addElements(java.util.List<SelectClauseElement> selectClauseElements)

Add a select expression element.

Parameters:

selectClauseElements - to add

toEPL

public void toEPL(java.io.StringWriter writer,
                  EPStatementFormatter formatter,
                  boolean isTopLevel,
                  boolean andDelete)

Renders the clause in textual representation.

Parameters:

writer - to output to

formatter - for newline-whitespace formatting

isTopLevel - to indicate if this select-clause is inside other clauses.

andDelete - indicator whether select and delete

isDistinct

public boolean isDistinct()

Returns indicator whether distinct or not.

Returns:

distinct indicator

getDistinct

public boolean getDistinct()

Returns indicator whether distinct or not.

Returns:

distinct indicator

setDistinct

public void setDistinct(boolean distinct)

Returns indicator whether distinct or not.

Parameters:

distinct - distinct indicator

distinct

public SelectClause distinct(boolean distinct)

Sets distinct

Parameters:

distinct - distinct indicator

Returns:

the select clause

distinct

public SelectClause distinct()

Sets distinct to true.

Returns:

the select clause