CommandVisitor (Jep with extensions API )

java.lang.Object
- com.singularsys.jep.walkers.DoNothingVisitor
- - com.singularsys.extensions.xjep.CommandVisitor

All Implemented Interfaces:

JepComponent, ParserVisitor, java.io.Serializable
```
public class CommandVisitor
extends DoNothingVisitor
```
Executes commands like diff and eval embedded in expression trees. For example you could do
```
 eval(diff(x ^ 3, x), x, 2)
 
```
to differentiate x^3 and then substitute x=2 to get the value 12. To use do
```
 Jep j = ...; Node in = ...;
 TreeUtils tu = new TreeUtils(j);
 CommandVisitor cv = new CommandVisitor(tu);
 Node out = cv.process(in);
 
```
Commands to be executed must implement CommandVisitorI and PostfixMathCommandI. See ParserVisitor for details on the VisitorPattern.
Author:

R Morris Created on 19-Jun-2003

See Also:

Serialized Form

Field Summary
- Fields inherited from class com.singularsys.jep.walkers.DoNothingVisitor
  ft, jep, nf, ot, vt

Constructor Summary

Constructors
Constructor Description

CommandVisitor()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Node`	`process(Node node)`	Descends the tree processing all diff, eval and simplify options
`java.lang.Object`	`visit(ASTFunNode node, java.lang.Object data)`	Visit a function node.
`java.lang.Object`	`visit(ASTOpNode node, java.lang.Object data)`	Visit a operator node.

Methods inherited from class com.singularsys.jep.walkers.DoNothingVisitor
childrenHaveChanged, copyChildrenIfNeeded, getFunctionTable, getLightWeightInstance, getNodeFactory, getOperatorTable, getVariableTable, init, visit, visit, visit, visitChildren, visitNode

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - CommandVisitor
```
public CommandVisitor()
```
- Method Detail
  - process
```
public Node process(Node node)
             throws ParseException
```
    Descends the tree processing all diff, eval and simplify options
    
    Throws:
    
    ParseException
  - visit
```
public java.lang.Object visit(ASTFunNode node,
                              java.lang.Object data)
                       throws JepException
```
    Description copied from class: DoNothingVisitor
    
    Visit a function node. Can be overridden by sub-classes.
    
    Specified by:
    
    visit in interface ParserVisitor
    
    Overrides:
    
    visit in class DoNothingVisitor
    
    Throws:
    
    JepException
  - visit
```
public java.lang.Object visit(ASTOpNode node,
                              java.lang.Object data)
                       throws JepException
```
    Description copied from class: DoNothingVisitor
    
    Visit a operator node. Can be overridden by sub-classes.
    
    Specified by:
    
    visit in interface ParserVisitor
    
    Overrides:
    
    visit in class DoNothingVisitor
    
    Throws:
    
    JepException