Package org.teiid.query.sql.lang

Class SubqueryFromClause

java.lang.Object

org.teiid.query.sql.lang.FromClause

org.teiid.query.sql.lang.SubqueryFromClause

All Implemented Interfaces:

Cloneable, SubqueryContainer, LanguageObject

public class SubqueryFromClause
extends FromClause
implements SubqueryContainer

A FROM subpart that represents a subquery. For example, the FROM clause: "FROM (SELECT a FROM b)" will have a SubqueryFromClause referencing the subquery.

Nested Class Summary

Nested classes/interfaces inherited from interface org.teiid.query.sql.LanguageObject

LanguageObject.Util

Nested classes/interfaces inherited from interface org.teiid.query.sql.lang.SubqueryContainer

SubqueryContainer.Evaluatable<T extends Command>

Field Summary

Fields inherited from class org.teiid.query.sql.lang.FromClause

PRESERVE

Constructor Summary

Constructors

Constructor	Description
SubqueryFromClause(String name)	Construct default object
SubqueryFromClause(String name, Command command)	Construct object with specified command and name
SubqueryFromClause(GroupSymbol symbol, Command command)

Method Summary

Modifier and Type	Method	Description
void	acceptVisitor(LanguageVisitor visitor)	Method for accepting a visitor.
FromClause	cloneDirect()	Get deep clone of object
void	collectGroups(Collection groups)	Collect all GroupSymbols for this from clause.
boolean	equals(Object obj)	Check whether objects are equal
Command	getCommand()	Get command held by clause
GroupSymbol	getGroupSymbol()	Get GroupSymbol representing the named subquery
String	getName()	Get name of this clause.
String	getOutputName()
int	hashCode()	Get hash code of object
boolean	isLateral()
void	setCommand(Command command)	Set the command held by the clause
void	setLateral(boolean table)
void	setName(String name)	Reset the alias for this subquery from clause and it's pseudo-GroupSymbol.

Methods inherited from class org.teiid.query.sql.lang.FromClause

clone, getMakeDep, getMakeInd, hasHint, isMakeDep, isMakeNotDep, isNoUnnest, isOptional, isPreserve, setMakeDep, setMakeDep, setMakeInd, setMakeNotDep, setNoUnnest, setOptional, setPreserve, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.teiid.query.sql.LanguageObject

clone

Constructor Detail

SubqueryFromClause

public SubqueryFromClause(String name)

Construct default object

SubqueryFromClause

public SubqueryFromClause(String name,
                          Command command)

Construct object with specified command and name

Parameters:

command - Command representing subquery, or stored procedure

name - Alias of the subquery

SubqueryFromClause

public SubqueryFromClause(GroupSymbol symbol,
                          Command command)

Method Detail

isLateral

public boolean isLateral()

setLateral

public void setLateral(boolean table)

setName

public void setName(String name)

Reset the alias for this subquery from clause and it's pseudo-GroupSymbol. WARNING: this will modify the hashCode and equals semantics and will cause this object to be lost if currently in a HashMap or HashSet.

Parameters:

name - New name

Since:

4.3

setCommand

public void setCommand(Command command)

Set the command held by the clause

Specified by:

setCommand in interface SubqueryContainer

Parameters:

command - Command to hold

getCommand

public Command getCommand()

Get command held by clause

Specified by:

getCommand in interface SubqueryContainer

Returns:

Command held by clause

getName

public String getName()

Get name of this clause.

Returns:

Name of clause

getOutputName

public String getOutputName()

getGroupSymbol

public GroupSymbol getGroupSymbol()

Get GroupSymbol representing the named subquery

Returns:

GroupSymbol representing the subquery

collectGroups

public void collectGroups(Collection groups)

Collect all GroupSymbols for this from clause.

Specified by:

collectGroups in class FromClause

Parameters:

groups - Groups to add to

acceptVisitor

public void acceptVisitor(LanguageVisitor visitor)

Description copied from interface: LanguageObject

Method for accepting a visitor. It is the responsibility of the language object to call back on the visitor.

Specified by:

acceptVisitor in interface LanguageObject

Specified by:

acceptVisitor in class FromClause

Parameters:

visitor - Visitor being used

equals

public boolean equals(Object obj)

Check whether objects are equal

Overrides:

equals in class FromClause

Parameters:

obj - Other object

Returns:

True if equal

hashCode

public int hashCode()

Get hash code of object

Overrides:

hashCode in class Object

Returns:

Hash code

cloneDirect

public FromClause cloneDirect()

Get deep clone of object

Specified by:

cloneDirect in class FromClause

Returns:

Deep copy of the object