XVariable (Jep with extensions API )

java.lang.Object
- java.util.Observable
- - com.singularsys.jep.Variable
  - - com.singularsys.extensions.xjep.XVariable

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

DVariable
```
public class XVariable
extends Variable
```
Variables which have their equations stored.

Author:

Rich Morris Created on 28-Feb-2004

See Also:

Serialized Form

Field Summary
- Fields inherited from class com.singularsys.jep.Variable
  keys, keyVals, name

Constructor Summary

Constructors
Constructor Description

XVariable(java.lang.String name)

XVariable(java.lang.String name, java.lang.Object value)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.Object`	`calcValue(XEvaluator xeval, boolean force)`	Calculates the value for the variables equation and returns that value.
`Node`	`getEquation()`	get the equation
`boolean`	`hasEquation()`	Does this variable has an associated equation?
`void`	`setEquation(Node eqn)`	sets the equation
`java.lang.String`	`toString()`	Returns a string rep of variable with its equation and value.
`java.lang.String`	`toString(PrintVisitor pv)`	Returns a string rep of variable with its equation and value.

Methods inherited from class com.singularsys.jep.Variable
getHook, getName, getValue, hasValidValue, hookKeys, isConstant, removeHook, setHook, setIsConstant, setValidValue, setValue, setValue, setValueRaw

Methods inherited from class java.util.Observable
addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

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

- Constructor Detail
  - XVariable
```
public XVariable(java.lang.String name)
```
  - XVariable
```
public XVariable(java.lang.String name,
                 java.lang.Object value)
```
- Method Detail
  - hasEquation
```
public boolean hasEquation()
```
    Does this variable has an associated equation?
  - setEquation
```
public void setEquation(Node eqn)
```
    sets the equation
  - getEquation
```
public Node getEquation()
```
    get the equation
  - calcValue
```
public java.lang.Object calcValue(XEvaluator xeval,
                                  boolean force)
                           throws EvaluationException
```
    Calculates the value for the variables equation and returns that value.
    
    Parameters:
    
    xeval - evaluator to use
    
    force - whether to force re-evaluation if the variable has a valid value
    
    Returns:
    
    value of variable
    
    Throws:
    
    EvaluationException
  - toString
```
public java.lang.String toString(PrintVisitor pv)
```
    Returns a string rep of variable with its equation and value.
  - toString
```
public java.lang.String toString()
```
    Returns a string rep of variable with its equation and value.
    
    Overrides:
    
    toString in class Variable
    
    Returns:
    
    A string with the variable name and value.