com.singularsys.jep.misc.javaops
Class PostDec

java.lang.Object
  extended by com.singularsys.jep.functions.PostfixMathCommand
      extended by com.singularsys.jep.misc.javaops.AbstractInc
          extended by com.singularsys.jep.misc.javaops.PostDec
All Implemented Interfaces:
CallbackEvaluationI, PostfixMathCommandI, java.io.Serializable

public class PostDec
extends AbstractInc

Java style x-- operator.

See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from interface com.singularsys.jep.functions.CallbackEvaluationI
CallbackEvaluationI.Runnable
 
Field Summary
 
Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand
curNumberOfParameters, name, NaN, numberOfParameters
 
Constructor Summary
PostDec()
           
 
Method Summary
 java.lang.Object evaluate(Node node, Evaluator pv)
          Performs some special evaluation on the node.
 
Methods inherited from class com.singularsys.jep.misc.javaops.AbstractInc
getVal, getVar, run
 
Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand
asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkNumberOfParameters, checkStack, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

PostDec

public PostDec()
Method Detail

evaluate

public java.lang.Object evaluate(Node node,
                                 Evaluator pv)
                          throws EvaluationException
Description copied from interface: CallbackEvaluationI
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. This value will be passed to other functions higher up the node tree. The value can be any type including Double or Vector<Object>
Throws:
EvaluationException
See Also:
Evaluator


Copyright © 2010 Singular Systems http://www.singularsys.com/jep