Package org.yamcs.studio.data.formula

Class AbstractVNumberVNumberToVNumberFormulaFunction

java.lang.Object
org.yamcs.studio.data.formula.AbstractVNumberVNumberToVNumberFormulaFunction
All Implemented Interfaces:
FormulaFunction
public abstract class AbstractVNumberVNumberToVNumberFormulaFunction extends Object implements FormulaFunction
Abstract class for formula functions that take two VNumbers as arguments and return a VNumber.

This class takes care of:

  • extracting double value from VNumber
  • null handling - returns null if one argument is null
  • alarm handling - returns highest alarm
  • time handling - returns latest time, or now if no time is available
  • display handling - returns display none

  • Constructor Details

    • AbstractVNumberVNumberToVNumberFormulaFunction

      public AbstractVNumberVNumberToVNumberFormulaFunction(String name, String description, String arg1Name, String arg2Name)
      Creates a new function.
      Parameters:
      name - function name; can't be null
      description - function description; can't be null
      arg1Name - first argument name; can't be null
      arg2Name - second argument name; can't be null

  • Method Details

    • getName

      public final String getName()
      Description copied from interface: FormulaFunction
      Return the name of the function.
      Specified by:
      getName in interface FormulaFunction
      Returns:
      the function name

    • getDescription

      public final String getDescription()
      Description copied from interface: FormulaFunction
      Return the description of the function.
      Specified by:
      getDescription in interface FormulaFunction
      Returns:
      the function description

    • isVarArgs

      public final boolean isVarArgs()
      Description copied from interface: FormulaFunction
      Whether the function takes a variable number of arguments.

      Variable arguments can only be at the end of the argument list, and have the same type.

      Specified by:
      isVarArgs in interface FormulaFunction
      Returns:
      true if the function can accept a variable number of arguments

    • getArgumentTypes

      public final List<Class<?>> getArgumentTypes()
      Description copied from interface: FormulaFunction
      The ordered list of the arguments type.
      Specified by:
      getArgumentTypes in interface FormulaFunction
      Returns:
      the types of the arguments

    • getArgumentNames

      public final List<String> getArgumentNames()
      Description copied from interface: FormulaFunction
      The ordered list of the argument names.
      Specified by:
      getArgumentNames in interface FormulaFunction
      Returns:
      the names of the names

    • getReturnType

      public final Class<?> getReturnType()
      Description copied from interface: FormulaFunction
      The type of the function result.
      Specified by:
      getReturnType in interface FormulaFunction
      Returns:
      the result type

    • calculate

      public final Object calculate(List<Object> args)
      Description copied from interface: FormulaFunction
      Calculate the result of the function given the arguments.
      Specified by:
      calculate in interface FormulaFunction
      Parameters:
      args - the argument list
      Returns:
      the result of the function

    • calculate

      public abstract double calculate(double arg1, double arg2)
      Calculates the result based on the two arguments. This is the only method one has to implement.
      Parameters:
      arg1 - the first argument
      arg2 - the second argument
      Returns:
      the result