VariableProvider (Palladio Core)

All Known Implementing Classes:

DefaultVariableProvider
```
public interface VariableProvider
```
This class represents the interface for variable providers for Expression Engine. Object of this type will be resolving the variable for any expression. It can support more than one variables.

Version:

1.0

Author:

Mohit Gupta, Parmod Kamboj

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`Type`	`getVariableType(String variableName)` Gets the type of variable.
`ValueObject`	`getVariableValue(String variableName)` Gets the value of variable.
`void`	`initialize(ExpressionContext expressionContext)` It initialize the Function provider with expression context and also gives a chance to pre-initialize any internal states for operations
`boolean`	`supportsVariable(String variableName)` Checks whether the specified variable is supported by this variable provider or not.

- Method Detail
  - initialize
```
void initialize(ExpressionContext expressionContext)
         throws ExpressionEngineException
```
    It initialize the Function provider with expression context and also gives a chance to pre-initialize any internal states for operations
    
    Parameters:
    
    expressionContext - Context of current expression evaluation process
    
    Throws:
    
    ExpressionEngineException
  - getVariableType
```
Type getVariableType(String variableName)
              throws ExpressionEngineException
```
    Gets the type of variable.
    
    Parameters:
    
    variableName - name of the variable
    
    Returns:
    
    type of the variable
    
    Throws:
    
    ExpressionEngineException - if anything goes wrong
  - getVariableValue
```
ValueObject getVariableValue(String variableName)
                      throws ExpressionEngineException
```
    Gets the value of variable.
    
    Parameters:
    
    variableName - name of the variable.
    
    Returns:
    
    value of variable wrapped in ValueObject
    
    Throws:
    
    ExpressionEngineException - if anything goes wrong
  - supportsVariable
```
boolean supportsVariable(String variableName)
                  throws ExpressionEngineException
```
    Checks whether the specified variable is supported by this variable provider or not.
    
    Parameters:
    
    variableName - name of the variable
    
    Returns:
    
    true if the variable is supported by this provider false otherwise
    
    Throws:
    
    ExpressionEngineException - if anything goes wrong

Interface VariableProvider

Method Summary

Method Detail

initialize

getVariableType

getVariableValue

supportsVariable