Interface JepExpressionFunction

All Superinterfaces:
JepFunction, org.nfunk.jep.function.PostfixMathCommandI
All Known Implementing Classes:
ChannelFunction, ExtraValueFunction, Log2Function, MeanFunction, PositionFunction, RawChannelFunction, RawFunction, ReporterFunction, ScoreFunction

public interface JepExpressionFunction
extends JepFunction
This interface should be implemented by JEP functions that can also be converted into an Expression that can be used in queries.
See Also:
Jep.formulaToExpression(String, JepFunction[])
Last modified
$Date: 2009-04-06 14:52:39 +0200 (må, 06 apr 2009) $
  • Method Summary

    Modifier and Type Method Description
    Expression toExpression​(Node node)
    Convert this function to an Expression that can be used in a query.

    Methods inherited from interface net.sf.basedb.util.jep.JepFunction


    Methods inherited from interface org.nfunk.jep.function.PostfixMathCommandI

    checkNumberOfParameters, getNumberOfParameters, run, setCurNumberOfParameters
  • Method Details

    • toExpression

      Expression toExpression​(Node node)
      Convert this function to an Expression that can be used in a query. The implementation must check that the node contains the correct number of children (ie. arguments to the function) and convert the arguments to whatever is suitable for the expression. Example from the Log2Function
      int numChildren = node.jjtGetNumChildren();
      if (numChildren != 1)
         throw new BaseException("Invalid number of arguments for 'log2' function: " + numChildren);
      return Expressions.log2(Jep.nodeToExpression(node.jjtGetChild(0)));
      node - The node representing this function
      An Expression object