Environment (appNG Parent 1.22.1 API)

All Known Implementing Classes:

DefaultEnvironment
```
public interface Environment
```
The Environment is able to set, read and remove attributes of a certain Scope. The main purposes are:
- keeping track of the current Subject via getSubject()
- providing informations about the current Locale and TimeZone via getLocale() and getTimeZone()
- allowing to share attributes between multiple applications (using Scope.SESSION and Scope.SITE)
- keeping track of platform-wide configuration parameters ( Scope.PLATFORM and Applications where Application.isPrivileged() is true)

Author:: Matthias Müller
See Also:: Scope

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`<T> T`	`getAttribute(Scope scope, String name)` Returns the attribute with the given name for the given `Scope`.
`String`	`getAttributeAsString(Scope scope, String name)` Returns the string-representation of an attribute, calling `toString()` on the resulting object.
`Locale`	`getLocale()` Returns the current `Locale`.
`Subject`	`getSubject()` Returns the current `Subject`.
`TimeZone`	`getTimeZone()` Returns the current `TimeZone`.
`void`	`init(javax.servlet.ServletContext context, javax.servlet.http.HttpSession session, javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, String host)` Initializes the `Environment`.
`boolean`	`isSubjectAuthenticated()` Returns `true` if the current `Subject` is authenticated, `false` otherwise
`Set<String>`	`keySet(Scope scope)` Returns a `Set` of all attribute names for the given `Scope`
`<T> T`	`removeAttribute(Scope scope, String name)` Removes the attribute with the given name from the given `Scope` and returns it.
`void`	`setAttribute(Scope scope, String name, Object value)` Sets an attribute for the given `Scope` to the given value.

- Method Detail
  - setAttribute
```
void setAttribute(Scope scope,
                  String name,
                  Object value)
```
    Sets an attribute for the given Scope to the given value.
    
    Parameters:
    
    scope - the Scope of the attribute to set
    
    name - the name of the attribute to set
    
    value - the attribute to set
  - getAttribute
```
<T> T getAttribute(Scope scope,
                   String name)
```
    Returns the attribute with the given name for the given Scope.
    
    Parameters:
    
    scope - the Scope of the attribute to get
    
    name - the name of the attribute to get
    
    Returns:
    
    the attribute of the desired type, or null if the attribute does not exist in the given Scope
  - removeAttribute
```
<T> T removeAttribute(Scope scope,
                      String name)
```
    Removes the attribute with the given name from the given Scope and returns it.
    
    Parameters:
    
    scope - the Scope of the attribute to remove
    
    name - the name of the attribute to remove
    
    Returns:
    
    the attribute of the desired type, or null if the attribute does not exist in the given Scope
  - getAttributeAsString
```
String getAttributeAsString(Scope scope,
                            String name)
```
    Returns the string-representation of an attribute, calling toString() on the resulting object.
    
    Parameters:
    
    scope - the Scope of the attribute to get
    
    name - the name of the attribute to get
    
    Returns:
    
    the string-representation of the attribute, or null if the attribute does not exist in the given Scope
  - keySet
```
Set<String> keySet(Scope scope)
```
    Returns a Set of all attribute names for the given Scope
    
    Parameters:
    
    scope - the Scope the get the attribute names for
    
    Returns:
    
    a Set containing all attribute names, or null if the Scope is not available
  - getSubject
```
Subject getSubject()
```
    Returns the current Subject.
    
    Returns:
    
    the Subject, if present
  - getLocale
```
Locale getLocale()
```
    Returns the current Locale. If a Subject is logged in, a Locale is returned that represent the language of the Subject via Account.getLanguage(). If no Subject is present, the default-Locale from the Site is used.
    
    Returns:
    
    the Locale
  - getTimeZone
```
TimeZone getTimeZone()
```
    Returns the current TimeZone. If a Subject is present (no matter whether it is logged in or not), Account.getTimeZone() is being returned. If no Subject is present, the default-TimeZone from the Site is used.
    
    Returns:
    
    the TimeZone
  - isSubjectAuthenticated
```
boolean isSubjectAuthenticated()
```
    Returns true if the current Subject is authenticated, false otherwise
    
    Returns:
    
    true if the current Subject is authenticated, false otherwise
  - init
```
void init(javax.servlet.ServletContext context,
          javax.servlet.http.HttpSession session,
          javax.servlet.ServletRequest request,
          javax.servlet.ServletResponse response,
          String host)
```
    Initializes the Environment.
    
    Parameters:
    
    context - a ServletContext
    
    session - a HttpSession
    
    request - a ServletRequest
    
    response - a ServletResponse
    
    host - the host for the site-Scope
    
    Throws:
    
    IllegalStateException - if this Environment already has been initialized

Interface Environment

Method Summary

Method Detail

setAttribute

getAttribute

removeAttribute

getAttributeAsString

keySet

getSubject

getLocale

getTimeZone

isSubjectAuthenticated

init