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## com.singularsys.jep.functions
Interface CallbackEvaluationI

All Known Implementing Classes:
  Assign, If

    public interface CallbackEvaluationI

Functions which require greater control over their evaluation should implement this interface.

Author:
  Rich Morris Created on 18-Nov-2003

Method Summary
`java.lang.Object` | `evaluate(Node node, Evaluator pv)` Performs some special evaluation on the node.

Method Detail

### evaluate

    java.lang.Object evaluate(Node node,
                              Evaluator pv)
                              throws EvaluationException

  Performs some special evaluation on the node. This method has the responsibility for evaluating the children of the node and it should generally call

       pv.eval(node.jjtGetChild(i))

  for each child. The SymbolTable is not passed as an argument. This is because it is better practice to get and set variable values by using node.getVar().setValue() rather that through the SymbolTable with requires a hashtable lookup.

  Parameters:
    `node` - The current node
    `pv` - The visitor, can be used evaluate the children
  Returns:
    the value after evaluation
  Throws:
    `EvaluationException`

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Copyright © 2007 Singular Systems http://www.singularsys.com/jep