Package net.sf.basedb.core.query
Class GeometricMeanExpression
- java.lang.Object
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- net.sf.basedb.core.query.GeometricMeanExpression
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- All Implemented Interfaces:
Expression
,QueryElement
public class GeometricMeanExpression extends Object implements Expression
Calculates the geometric mean of an expression: EXP(AVG(LN(e)))- Version:
- 2.4
- Author:
- Johan Enell
- See Also:
Aggregations.geometricMean(Expression)
- Last modified
- $Date: 2012-09-14 09:28:35 +0200 (fr, 14 sep 2012) $
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Field Summary
Fields Modifier and Type Field Description private Expression
avg
private Expression
e
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Constructor Summary
Constructors Constructor Description GeometricMeanExpression(Expression e)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
equals(Object other)
This expression is equal to another GeometricMeanExpression if their child expressions are equal.private Expression
getAvg()
Collection<? extends QueryElement>
getChildren()
Get the children of this query element or null if it has no children.int
hashCode()
String
toQl(Query query, DbControl dc)
Create a query language string of the query element.String
toString()
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Field Detail
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e
private final Expression e
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avg
private Expression avg
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Constructor Detail
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GeometricMeanExpression
GeometricMeanExpression(Expression e)
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Method Detail
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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 theQuery.getQueryType()
method to find out which query language is wanted in case the element requires different syntax for different languages.- Specified by:
toQl
in interfaceQueryElement
- Parameters:
query
- The query that is about to be executeddc
- TheDbControl
object used to execute the query- Throws:
BaseException
- If there is any other error
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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 theAddExpression
has two children, the expression beeing added.- Specified by:
getChildren
in interfaceQueryElement
- Returns:
- The expression to find the mean for
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equals
public boolean equals(Object other)
This expression is equal to another GeometricMeanExpression if their child expressions are equal.
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getAvg
private Expression getAvg()
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