org.axiondb
Class ColumnIdentifier

java.lang.Object
  org.axiondb.BaseSelectable
      org.axiondb.ColumnIdentifier

All Implemented Interfaces:

java.io.Serializable, Selectable

public class ColumnIdentifier
extends BaseSelectable
implements Selectable

An identifier for a column.

Column names and aliases always stored (and returned) in upper case.

Version:

$Revision: 1.25 $ $Date: 2006/01/10 21:02:37 $

See Also:

Serialized Form

Field Summary

Fields inherited from class org.axiondb.BaseSelectable

_hash

Constructor Summary

ColumnIdentifier(java.lang.String column)

ColumnIdentifier(TableIdentifier table, java.lang.String columnName)

ColumnIdentifier(TableIdentifier table, java.lang.String columnName, java.lang.String columnAlias)

ColumnIdentifier(TableIdentifier table, java.lang.String columnName, java.lang.String columnAlias, DataType type)

Method Summary

boolean	equals(java.lang.Object otherobject) Returns true iff otherobject is a ColumnIdentifier whose name, table identifier, and alias are equal to mine.
java.lang.Object	evaluate(RowDecorator row) Returns the value of the column I identify within the given row .
ColumnIdentifier	getCanonicalIdentifier()
DataType	getDataType() Returns my DataType, if any.
java.lang.String	getTableAlias() Returns the alias name of my table or null.
TableIdentifier	getTableIdentifier() Returns my table identifier, if any.
java.lang.String	getTableName() Returns the name of my table or null.
int	hashCode() Returns a hash code in keeping with the standard equals/ hashCodecontract.
void	setDataType(DataType type) Sets my DataType, if any.
void	setName(java.lang.String column) Sets the name of this column, and the name of my table if the given name includes " .".
void	setTableIdentifier(TableIdentifier table) Sets my table identifier, if any.
java.lang.String	toString() Returns a String representation of me, suitable for debugging output.

Methods inherited from class org.axiondb.BaseSelectable

getAlias, getLabel, getName, setAlias, setVariableContext

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.axiondb.Selectable

getAlias, getLabel, getName, setVariableContext

Constructor Detail

ColumnIdentifier

public ColumnIdentifier(java.lang.String column)

Parameters:

column - the local name of my column

ColumnIdentifier

public ColumnIdentifier(TableIdentifier table,
                        java.lang.String columnName)

Parameters:

table - my table, which may be null

column - my column

ColumnIdentifier

public ColumnIdentifier(TableIdentifier table,
                        java.lang.String columnName,
                        java.lang.String columnAlias)

Parameters:

table - my table, which may be null

column - my column

columnAlias - the alias for my column, which may be null

ColumnIdentifier

public ColumnIdentifier(TableIdentifier table,
                        java.lang.String columnName,
                        java.lang.String columnAlias,
                        DataType type)

Parameters:

table - my table, which may be null

column - my column

columnAlias - the alias for my column, which may be null

type - the DataTypeof my column, which may be null

Method Detail

equals

public boolean equals(java.lang.Object otherobject)

Returns true iff otherobject is a ColumnIdentifier whose name, table identifier, and alias are equal to mine.

Overrides:

equals in class java.lang.Object

evaluate

public java.lang.Object evaluate(RowDecorator row)
                          throws AxionException

Returns the value of the column I identify within the given row .

Specified by:

evaluate in interface Selectable

Throws:

AxionException

getCanonicalIdentifier

public ColumnIdentifier getCanonicalIdentifier()

getDataType

public final DataType getDataType()

Returns my DataType, if any.

Specified by:

getDataType in interface Selectable

getTableAlias

public final java.lang.String getTableAlias()

Returns the alias name of my table or null. Unlike getTableIdentifier().getTableAlias() this method will return null when I don't have a table identifier.

getTableIdentifier

public final TableIdentifier getTableIdentifier()

Returns my table identifier, if any.

getTableName

public final java.lang.String getTableName()

Returns the name of my table or null. Unlike getTableIdentifier().getTableName() this method will return null when I don't have a table identifier.

hashCode

public int hashCode()

Returns a hash code in keeping with the standard equals/ hashCodecontract.

Overrides:

hashCode in class java.lang.Object

setDataType

public void setDataType(DataType type)

Sets my DataType, if any.

setName

public void setName(java.lang.String column)

Sets the name of this column, and the name of my table if the given name includes " .".

Overrides:

setName in class BaseSelectable

setTableIdentifier

public void setTableIdentifier(TableIdentifier table)

Sets my table identifier, if any.

toString

public java.lang.String toString()

Returns a String representation of me, suitable for debugging output.

Overrides:

toString in class java.lang.Object