com.metamatrix.query.sql.lang
Class SubqueryFromClause

java.lang.Object
  com.metamatrix.query.sql.lang.FromClause
      com.metamatrix.query.sql.lang.SubqueryFromClause

All Implemented Interfaces:

SubqueryContainer, LanguageObject, java.io.Serializable, java.lang.Cloneable

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.

See Also:

Serialized Form

Constructor Summary

SubqueryFromClause(GroupSymbol symbol, Command command)

SubqueryFromClause(java.lang.String name)
Construct default object

SubqueryFromClause(java.lang.String name, Command command)
Construct object with specified command and name

Method Summary

void	acceptVisitor(LanguageVisitor visitor) Method for accepting a visitor.
java.lang.Object	clone() Get deep clone of object
void	collectGroups(java.util.Collection groups) Collect all GroupSymbols for this from clause.
boolean	equals(java.lang.Object obj) Check whether objects are equal
Command	getCommand() Get command held by clause
GroupSymbol	getGroupSymbol() Get GroupSymbol representing the named subquery
java.lang.String	getName() Get name of this clause.
java.lang.String	getOutputName()
int	hashCode() Get hash code of object
void	setCommand(Command command) Set the command held by the clause
void	setName(java.lang.String name) Reset the alias for this subquery from clause and it's pseudo-GroupSymbol.
java.lang.String	toString() Returns a string representation of an instance of this class.

Methods inherited from class com.metamatrix.query.sql.lang.FromClause

hasHint, isMakeDep, isMakeNotDep, isOptional, setMakeDep, setMakeNotDep, setOptional

Methods inherited from class java.lang.Object

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

Constructor Detail

SubqueryFromClause

public SubqueryFromClause(java.lang.String name)

Construct default object

SubqueryFromClause

public SubqueryFromClause(java.lang.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

setName

public void setName(java.lang.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 java.lang.String getName()

Get name of this clause.

Returns:

Name of clause

getOutputName

public java.lang.String getOutputName()

getGroupSymbol

public GroupSymbol getGroupSymbol()

Get GroupSymbol representing the named subquery

Returns:

GroupSymbol representing the subquery

collectGroups

public void collectGroups(java.util.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(java.lang.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 java.lang.Object

Returns:

Hash code

clone

public java.lang.Object clone()

Get deep clone of object

Specified by:

clone in interface LanguageObject

Specified by:

clone in class FromClause

Returns:

Deep copy of the object

toString

public java.lang.String toString()

Returns a string representation of an instance of this class.

Overrides:

toString in class java.lang.Object

Returns:

String representation of object