Package com.singularsys.extensions.xjep

Class CommandVisitor

java.lang.Object
com.singularsys.jep.walkers.GenericDoNothingVisitor<Void>
com.singularsys.jep.walkers.GenericDeepCopyVisitor<Void>
com.singularsys.extensions.xjep.CommandVisitor
All Implemented Interfaces:
GenericVisitor<Node,Void,ParseException>, JepComponent, Serializable
public class CommandVisitor extends GenericDeepCopyVisitor<Void>
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: