public class LogExpression extends java.lang.Object implements Expression
The n-based logarithm is easily calculated as the natural logarithm of x divided natural logarithm of the base, ie. log(n, e) = ln(e) / ln(n)
Expressions.log(double, Expression)
Modifier and Type | Field and Description |
---|---|
private double |
base |
private Expression |
e1 |
Constructor and Description |
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LogExpression(double base,
Expression e1) |
Modifier and Type | Method and Description |
---|---|
boolean |
equals(java.lang.Object other)
This expression is equal to another LogExpression if their
child expressions and bases are equal.
|
java.util.Collection<? extends QueryElement> |
getChildren()
Get the children of this query element or null if it has no children.
|
int |
hashCode() |
java.lang.String |
toQl(Query query,
DbControl dc)
Create a query language string of the query element.
|
java.lang.String |
toString() |
private final double base
private final Expression e1
LogExpression(double base, Expression e1)
public java.lang.String toQl(Query query, DbControl dc) throws BaseException
QueryElement
Query.getQueryType()
method to find out which query language is wanted
in case the element requires different syntax for different languages.toQl
in interface QueryElement
query
- The query that is about to be executeddc
- The DbControl
object used to execute the queryBaseException
- If there is any other errorpublic java.util.Collection<? extends QueryElement> getChildren()
QueryElement
AddExpression
has two children, the expression
beeing added.getChildren
in interface QueryElement
public java.lang.String toString()
toString
in class java.lang.Object
public boolean equals(java.lang.Object other)
equals
in class java.lang.Object
public int hashCode()
hashCode
in class java.lang.Object