com.mckoi.database.interpret

Class SelectColumn

java.lang.Object

com.mckoi.database.interpret.SelectColumn

All Implemented Interfaces:

StatementTreeObject, Serializable, Cloneable

public final class SelectColumn
extends Object
implements Serializable, StatementTreeObject, Cloneable

Represents a column selected to be in the output of a select statement. This includes being either an aggregate function, a column or "*" which is the entire set of columns.

Author:

Tobias Downer

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
String	alias The alias of this column string.
Expression	expression The expression of this column.
String	glob_name If the column represents a glob of columns (eg.
Variable	internal_name The name of this column used internally to reference it.
Variable	resolved_name The fully resolved name that this column is given in the resulting table.

Constructor Summary

Constructors

Constructor and Description
SelectColumn()

Method Summary

Modifier and Type	Method and Description
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.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

glob_name

public String glob_name

If the column represents a glob of columns (eg. 'Part.*' or '*') then this is set to the glob string and 'expression' is left blank.

resolved_name

public Variable resolved_name

The fully resolved name that this column is given in the resulting table.

alias

public String alias

The alias of this column string.

expression

public Expression expression

The expression of this column. This is only NOT set when name == "*" indicating all the columns.

internal_name

public Variable internal_name

The name of this column used internally to reference it.

Constructor Detail

SelectColumn

public SelectColumn()

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 Object clone()
             throws 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 Object

Throws:

CloneNotSupportedException

toString

public String toString()

Overrides:

toString in class Object