2.17.2: 2011-06-17

net.sf.basedb.core.query
Class QuadraticMeanExpression

java.lang.Object
  extended by net.sf.basedb.core.query.QuadraticMeanExpression
All Implemented Interfaces:
Expression, QueryElement

public class QuadraticMeanExpression
extends Object
implements Expression

Calculates the quadratic mean of an expression

Version:
2.8
Author:
Martin
See Also:
Aggregations.quadraticMean(Expression)
Last modified
$Date: 2007-08-17 09:18:29 +0200 (Fri, 17 Aug 2007) $

Field Summary
private  Expression e
           
private  Expression sqrt
           
 
Constructor Summary
QuadraticMeanExpression(Expression e)
           
 
Method Summary
 boolean equals(Object other)
          This expression is equal to another QuadraticMeanExpression if their child expressions are equal.
 Collection<? extends QueryElement> getChildren()
          Get the children of this query element or null if it has no children.
private  Expression getSqrt()
           
 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

e

private final Expression e

sqrt

private Expression sqrt
Constructor Detail

QuadraticMeanExpression

QuadraticMeanExpression(Expression e)
Method Detail

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:
A collection or null

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

toString

public String toString()
Overrides:
toString in class Object

equals

public boolean equals(Object other)
This expression is equal to another QuadraticMeanExpression if their child expressions are equal.

Overrides:
equals in class Object

hashCode

public int hashCode()
Overrides:
hashCode in class Object

getSqrt

private Expression getSqrt()

2.17.2: 2011-06-17