net.sf.basedb.core
Class ExtraValueExpression

java.lang.Object
  net.sf.basedb.core.ExtraValueExpression

All Implemented Interfaces:

Expression, QueryElement

public class ExtraValueExpression
extends Object
implements Expression

Represents the value of an extra value in a dynamic query: alias.value.

Version:

2.0

Author:

Nicklas

Last modified

$Date: 2005-11-03 16:09:12 +0100 (to, 03 nov 2005) $

Field Summary

private VirtualColumn	column
private ExtraValue	extraValue

Constructor Summary

ExtraValueExpression(ExtraValue extraValue)
Create a new expression for the specified extra value.

Method Summary

boolean	equals(Object other) This expression is equal to another ExtraValueExpression if they represents the same extra value.
Collection<? extends QueryElement>	getChildren() Get the children of this query element or null if it has no children.
ExtraValue	getExtraValue()
int	hashCode()
String	toQl(Query query, DbControl dc) Create a query language string of the query element.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

extraValue

private final ExtraValue extraValue

column

private final VirtualColumn column

Constructor Detail

ExtraValueExpression

public ExtraValueExpression(ExtraValue extraValue)

Create a new expression for the specified extra value. It is assumed that the extra value has been joined before it is used in an expression.

Parameters:

extraValue - The extra value

See Also:

ExtraValueJoin, Dynamic.extraValue(ExtraValue)

Method Detail

toQl

public String toQl(Query query,
                   DbControl dc)
            throws BaseException

Description copied from interface: QueryElement

Create a query language string of the query element. Use the Query.getQueryType() method to find out which query language is wanted in case the element requires different syntax for different languages.

Specified by:

toQl in interface QueryElement

Parameters:

query - The query that is about to be executed

dc - The DbControl object used to execute the query

Throws:

BaseException - If there is any other error

getChildren

public Collection<? extends QueryElement> getChildren()

Description copied from interface: QueryElement

Get the children of this query element or null if it has no children. For example the AddExpression has two children, the expression beeing added.

Specified by:

getChildren in interface QueryElement

Returns:

Always null

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object other)

This expression is equal to another ExtraValueExpression if they represents the same extra value.

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getExtraValue

public ExtraValue getExtraValue()