2.17.2: 2011-06-17

net.sf.basedb.core
Class ExtraValueExpression

java.lang.Object
  extended by 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()

2.17.2: 2011-06-17