Module jakarta.servlet.jsp.jstl

Package jakarta.servlet.jsp.jstl.core

Class Config

java.lang.Object

jakarta.servlet.jsp.jstl.core.Config

public class Config
extends Object

Class supporting access to configuration settings.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	FMT_FALLBACK_LOCALE	Name of configuration setting for fallback locale
static final String	FMT_LOCALE	Name of configuration setting for application- (as opposed to browser-) based preferred locale
static final String	FMT_LOCALIZATION_CONTEXT	Name of configuration setting for i18n localization context
static final String	FMT_TIME_ZONE	Name of localization setting for time zone
static final String	SQL_DATA_SOURCE	Name of configuration setting for SQL data source
static final String	SQL_MAX_ROWS	Name of configuration setting for maximum number of rows to be included in SQL query result

Constructor Summary

Constructors

Constructor	Description
Config()

Method Summary

Modifier and Type	Method	Description
static Object	find(PageContext pageContext, String name)	Finds the value associated with a specific configuration setting identified by its context initialization parameter name.
static Object	get(HttpSession session, String name)	Looks up a configuration variable in the "session" scope.
static Object	get(PageContext pageContext, String name, int scope)	Looks up a configuration variable in the given scope.
static Object	get(ServletContext context, String name)	Looks up a configuration variable in the "application" scope.
static Object	get(ServletRequest request, String name)	Looks up a configuration variable in the "request" scope.
static void	remove(HttpSession session, String name)	Removes a configuration variable from the "session" scope.
static void	remove(PageContext pageContext, String name, int scope)	Removes a configuration variable from the given scope.
static void	remove(ServletContext context, String name)	Removes a configuration variable from the "application" scope.
static void	remove(ServletRequest request, String name)	Removes a configuration variable from the "request" scope.
static void	set(HttpSession session, String name, Object value)	Sets the value of a configuration variable in the "session" scope.
static void	set(PageContext pageContext, String name, Object value, int scope)	Sets the value of a configuration variable in the given scope.
static void	set(ServletContext context, String name, Object value)	Sets the value of a configuration variable in the "application" scope.
static void	set(ServletRequest request, String name, Object value)	Sets the value of a configuration variable in the "request" scope.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

FMT_LOCALE

public static final String FMT_LOCALE

Name of configuration setting for application- (as opposed to browser-) based preferred locale

See Also:

• Constant Field Values

FMT_FALLBACK_LOCALE

public static final String FMT_FALLBACK_LOCALE

Name of configuration setting for fallback locale

See Also:

• Constant Field Values

FMT_LOCALIZATION_CONTEXT

public static final String FMT_LOCALIZATION_CONTEXT

Name of configuration setting for i18n localization context

See Also:

• Constant Field Values

FMT_TIME_ZONE

public static final String FMT_TIME_ZONE

Name of localization setting for time zone

See Also:

• Constant Field Values

SQL_DATA_SOURCE

public static final String SQL_DATA_SOURCE

Name of configuration setting for SQL data source

See Also:

• Constant Field Values

SQL_MAX_ROWS

public static final String SQL_MAX_ROWS

Name of configuration setting for maximum number of rows to be included in SQL query result

See Also:

• Constant Field Values

Constructor Details

Config

public Config()

Method Details

get

public static Object get(PageContext pageContext,
 String name,
 int scope)

Looks up a configuration variable in the given scope.

The lookup of configuration variables is performed as if each scope had its own name space, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

Parameters:

pageContext - Page context in which the configuration variable is to be looked up

name - Configuration variable name

scope - Scope in which the configuration variable is to be looked up

Returns:

The java.lang.Object associated with the configuration variable, or null if it is not defined.

get

public static Object get(ServletRequest request,
 String name)

Looks up a configuration variable in the "request" scope.

The lookup of configuration variables is performed as if each scope had its own name space, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

Parameters:

request - Request object in which the configuration variable is to be looked up

name - Configuration variable name

Returns:

The java.lang.Object associated with the configuration variable, or null if it is not defined.

get

public static Object get(HttpSession session,
 String name)

Looks up a configuration variable in the "session" scope.

The lookup of configuration variables is performed as if each scope had its own name space, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

Parameters:

session - Session object in which the configuration variable is to be looked up

name - Configuration variable name

Returns:

The java.lang.Object associated with the configuration variable, or null if it is not defined, if session is null, or if the session is invalidated.

get

public static Object get(ServletContext context,
 String name)

Looks up a configuration variable in the "application" scope.

The lookup of configuration variables is performed as if each scope had its own name space, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

Parameters:

context - Servlet context in which the configuration variable is to be looked up

name - Configuration variable name

Returns:

The java.lang.Object associated with the configuration variable, or null if it is not defined.

set

public static void set(PageContext pageContext,
 String name,
 Object value,
 int scope)

Sets the value of a configuration variable in the given scope.

Setting the value of a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

Parameters:

pageContext - Page context in which the configuration variable is to be set

name - Configuration variable name

value - Configuration variable value

scope - Scope in which the configuration variable is to be set

set

public static void set(ServletRequest request,
 String name,
 Object value)

Sets the value of a configuration variable in the "request" scope.

Setting the value of a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

Parameters:

request - Request object in which the configuration variable is to be set

name - Configuration variable name

value - Configuration variable value

set

public static void set(HttpSession session,
 String name,
 Object value)

Sets the value of a configuration variable in the "session" scope.

Setting the value of a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

Parameters:

session - Session object in which the configuration variable is to be set

name - Configuration variable name

value - Configuration variable value

set

public static void set(ServletContext context,
 String name,
 Object value)

Sets the value of a configuration variable in the "application" scope.

Setting the value of a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

Parameters:

context - Servlet context in which the configuration variable is to be set

name - Configuration variable name

value - Configuration variable value

remove

public static void remove(PageContext pageContext,
 String name,
 int scope)

Removes a configuration variable from the given scope.

Removing a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not impact one stored in a different scope.

Parameters:

pageContext - Page context from which the configuration variable is to be removed

name - Configuration variable name

scope - Scope from which the configuration variable is to be removed

remove

public static void remove(ServletRequest request,
 String name)

Removes a configuration variable from the "request" scope.

Removing a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not impact one stored in a different scope.

Parameters:

request - Request object from which the configuration variable is to be removed

name - Configuration variable name

remove

public static void remove(HttpSession session,
 String name)

Removes a configuration variable from the "session" scope.

Removing a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not impact one stored in a different scope.

Parameters:

session - Session object from which the configuration variable is to be removed

name - Configuration variable name

remove

public static void remove(ServletContext context,
 String name)

Removes a configuration variable from the "application" scope.

Removing a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not impact one stored in a different scope.

Parameters:

context - Servlet context from which the configuration variable is to be removed

name - Configuration variable name

find

public static Object find(PageContext pageContext,
 String name)

Finds the value associated with a specific configuration setting identified by its context initialization parameter name.

For each of the JSP scopes (page, request, session, application), get the value of the configuration variable identified by name using method get(). Return as soon as a non-null value is found. If no value is found, get the value of the context initialization parameter identified by name.

Parameters:

pageContext - Page context in which the configuration setting is to be searched

name - Context initialization parameter name of the configuration setting

Returns:

The java.lang.Object associated with the configuration setting identified by name, or null if it is not defined.