FilterConfig (Java Servlet 4.0)

All Known Implementing Classes:

GenericFilter, HttpFilter
```
public interface FilterConfig
```
A filter configuration object used by a servlet container to pass information to a filter during initialization.

Since:

Servlet 2.3

See Also:

Filter

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`getFilterName()`	Returns the filter-name of this filter as defined in the deployment descriptor.
`String`	`getInitParameter(String name)`	Returns a `String` containing the value of the named initialization parameter, or `null` if the initialization parameter does not exist.
`Enumeration<String>`	`getInitParameterNames()`	Returns the names of the filter's initialization parameters as an `Enumeration` of `String` objects, or an empty `Enumeration` if the filter has no initialization parameters.
`ServletContext`	`getServletContext()`	Returns a reference to the `ServletContext` in which the caller is executing.

- Method Detail
  - getFilterName
```
String getFilterName()
```
    Returns the filter-name of this filter as defined in the deployment descriptor.
    
    Returns:
    
    the filter name of this filter
  - getServletContext
```
ServletContext getServletContext()
```
    Returns a reference to the ServletContext in which the caller is executing.
    
    Returns:
    
    a ServletContext object, used by the caller to interact with its servlet container
    
    See Also:
    
    ServletContext
  - getInitParameter
```
String getInitParameter(String name)
```
    Returns a String containing the value of the named initialization parameter, or null if the initialization parameter does not exist.
    
    Parameters:
    
    name - a String specifying the name of the initialization parameter
    
    Returns:
    
    a String containing the value of the initialization parameter, or null if the initialization parameter does not exist
  - getInitParameterNames
```
Enumeration<String> getInitParameterNames()
```
    Returns the names of the filter's initialization parameters as an Enumeration of String objects, or an empty Enumeration if the filter has no initialization parameters.
    
    Returns:
    
    an Enumeration of String objects containing the names of the filter's initialization parameters