de.cm.frw.core.fun.impl
Class NUM.Unary

java.lang.Object
  de.cm.frw.core.fun.impl.Function
      de.cm.frw.core.fun.impl.NUM.Unary

Enclosing class:

NUM

public abstract static class NUM.Unary
extends Function

Class to simplify the definition of numerical with one argument.

Author:

cm

checkArguments

public void checkArguments(java.util.Collection args)
                    throws Function.InvalidArguments

Description copied from class: Function

Override this method to check conditions on the arguments (like types) passed to the function in apply before the operate method is called. Throw the declared exception with a meaningful message when condition are not met. Note: Number of arguments < arity is checked before this is called to have enough arguments to operate on, however if more is no good, check it here ... Default implementation does nothing.

Overrides:

checkArguments in class Function

Throws:

Function.InvalidArguments

operate

public java.lang.Object operate(java.lang.Object[] operands)
                         throws Function.InvalidArguments

Description copied from class: Function

Override this to implement the actual operation realized by this function.

Remember to document the number and types of the operands and any other conditions for running the operate method. Or implement checkArguments instead.

Default implementation returns first argument passed in, realizing sort of an unary identity function.

Overrides:

operate in class Function

Parameters:

operands - An array of the arguments that where passed to apply

Returns:

An object as a result of the operation

Throws:

Function.InvalidArguments - when you implement it to do so ...