Variables (Apache Commons JXPath 1.4-SNAPSHOT API)

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All Superinterfaces:

Serializable

All Known Implementing Classes:

BasicVariables, KeywordVariables
```
public interface Variables
extends 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: 2008-05-03 00:05:41 +0200 (Sa, 03 Mai 2008) $

Author:

Dmitri Plotnikov

Method Summary

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

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

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