Package com.mckoi.database.interpret

Class ByColumn

java.lang.Object

com.mckoi.database.interpret.ByColumn

All Implemented Interfaces:

StatementTreeObject, java.io.Serializable, java.lang.Cloneable

public final class ByColumn
extends java.lang.Object
implements java.io.Serializable, StatementTreeObject, java.lang.Cloneable

Object used to represent a column in the 'order by' and 'group by' clauses of a select statement.

Author:

Tobias Downer

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
boolean	ascending	If 'order by' then true if sort is ascending (default).
Expression	exp	The expression that we are ordering by.
Variable	name	The name of the column in the 'by'.

Constructor Summary

Constructors

Constructor	Description
ByColumn()

Method Summary

Modifier and Type	Method	Description
java.lang.Object	clone()	Performs a DEEP clone of this object if it is mutable, or a deep clone of its mutable members.
void	prepareExpressions(ExpressionPreparer preparer)	Prepares all expressions in this statement tree object by passing the ExpressionPreparer object to the 'prepare' method of the expression.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

name

public Variable name

The name of the column in the 'by'.

exp

public Expression exp

The expression that we are ordering by.

ascending

public boolean ascending

If 'order by' then true if sort is ascending (default).

Constructor Detail

ByColumn

public ByColumn()

Method Detail

prepareExpressions

public void prepareExpressions(ExpressionPreparer preparer)
                        throws DatabaseException

Description copied from interface: StatementTreeObject

Prepares all expressions in this statement tree object by passing the ExpressionPreparer object to the 'prepare' method of the expression.

Specified by:

prepareExpressions in interface StatementTreeObject

Throws:

DatabaseException

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Description copied from interface: StatementTreeObject

Performs a DEEP clone of this object if it is mutable, or a deep clone of its mutable members. If the object is immutable then it may return 'this'.

Specified by:

clone in interface StatementTreeObject

Overrides:

clone in class java.lang.Object

Throws:

java.lang.CloneNotSupportedException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object