Variables

All Superinterfaces:

java.io.Serializable

All Known Implementing Classes:

BasicVariables, KeywordVariables
```
public interface Variables
extends java.io.Serializable
```
Variables provide access to a global set of values accessible via XPath. XPath can reference variables using the "$varname" syntax. To use a custom implementation of this interface, pass it to JXPathContext.setVariables()

Version:

$Revision: 652925 $ $Date: 2008-05-02 17:05:41 -0500 (Fri, 02 May 2008) $

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`declareVariable(java.lang.String varName, java.lang.Object value)`	Defines a new variable with the specified value or modifies the value of an existing variable.
`java.lang.Object`	`getVariable(java.lang.String varName)`	Returns the value of the specified variable.
`boolean`	`isDeclaredVariable(java.lang.String varName)`	Returns true if the specified variable is declared.
`void`	`undeclareVariable(java.lang.String varName)`	Removes an existing variable.

- Method Detail
  - isDeclaredVariable
```
boolean isDeclaredVariable(java.lang.String varName)
```
    Returns true if the specified variable is declared.
    
    Parameters:
    
    varName - variable name
    
    Returns:
    
    boolean
  - getVariable
```
java.lang.Object getVariable(java.lang.String varName)
```
    Returns the value of the specified variable.
    
    Parameters:
    
    varName - variable name
    
    Returns:
    
    Object value
    
    Throws:
    
    java.lang.IllegalArgumentException - if there is no such variable.
  - declareVariable
```
void declareVariable(java.lang.String varName,
                     java.lang.Object value)
```
    Defines a new variable with the specified value or modifies the value of an existing variable. May throw UnsupportedOperationException.
    
    Parameters:
    
    varName - variable name
    
    value - to declare
  - undeclareVariable
```
void undeclareVariable(java.lang.String varName)
```
    Removes an existing variable. May throw UnsupportedOperationException.
    
    Parameters:
    
    varName - is a variable name without the "$" sign