org.apache.struts2.dispatcher

Class SessionMap

java.lang.Object

java.util.AbstractMap<String,Object>

org.apache.struts2.dispatcher.SessionMap

All Implemented Interfaces:

Serializable, Map<String,Object>

public class SessionMap
extends AbstractMap<String,Object>
implements Serializable

A simple implementation of the Map interface to handle a collection of HTTP session attributes. The entrySet() method enumerates over all session attributes and creates a Set of entries. Note, this will occur lazily - only when the entry set is asked for.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
protected Set<Map.Entry<String,Object>>	entries
protected javax.servlet.http.HttpServletRequest	request
protected javax.servlet.http.HttpSession	session

Constructor Summary

Constructors

Constructor and Description
SessionMap(javax.servlet.http.HttpServletRequest request) Creates a new session map given a http servlet request.

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all attributes from the session as well as clears entries in this map.
boolean	containsKey(Object key) Checks if the specified session attribute with the given key exists.
Set<Map.Entry<String,Object>>	entrySet() Returns a Set of attributes from the http session.
Object	get(Object key) Returns the session attribute associated with the given key or null if it doesn't exist.
void	invalidate() Invalidate the http session.
Object	put(String key, Object value) Saves an attribute in the session.
Object	remove(Object key) Removes the specified session attribute.

Methods inherited from class java.util.AbstractMap

clone, containsValue, equals, hashCode, isEmpty, keySet, putAll, size, toString, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Detail

session

protected javax.servlet.http.HttpSession session

entries

protected Set<Map.Entry<String,Object>> entries

request

protected javax.servlet.http.HttpServletRequest request

Constructor Detail

SessionMap

public SessionMap(javax.servlet.http.HttpServletRequest request)

Creates a new session map given a http servlet request. Note, the enumeration of request attributes will occur when the map entries are asked for.

Parameters:

request - the http servlet request object.

Method Detail

invalidate

public void invalidate()

Invalidate the http session.

clear

public void clear()

Removes all attributes from the session as well as clears entries in this map.

Specified by:

clear in interface Map<String,Object>

Overrides:

clear in class AbstractMap<String,Object>

entrySet

public Set<Map.Entry<String,Object>> entrySet()

Returns a Set of attributes from the http session.

Specified by:

entrySet in interface Map<String,Object>

Specified by:

entrySet in class AbstractMap<String,Object>

Returns:

a Set of attributes from the http session.

get

public Object get(Object key)

Returns the session attribute associated with the given key or null if it doesn't exist. Note: Must use the same signature as AbstractMap.get(java.lang.Object) to ensure the expected specialized behaviour is performed here (and not the generic ancestor behaviour).

Specified by:

get in interface Map<String,Object>

Overrides:

get in class AbstractMap<String,Object>

Parameters:

key - the name of the session attribute.

Returns:

the session attribute or null if it doesn't exist.

put

public Object put(String key,
                  Object value)

Saves an attribute in the session.

Specified by:

put in interface Map<String,Object>

Overrides:

put in class AbstractMap<String,Object>

Parameters:

key - the name of the session attribute.

value - the value to set.

Returns:

the object that was just set.

remove

public Object remove(Object key)

Removes the specified session attribute. Note: Must use the same signature as AbstractMap.remove(java.lang.Object) to ensure the expected specialized behaviour is performed here (and not the generic ancestor behaviour).

Specified by:

remove in interface Map<String,Object>

Overrides:

remove in class AbstractMap<String,Object>

Parameters:

key - the name of the attribute to remove.

Returns:

the value that was removed or null if the value was not found (and hence, not removed).

containsKey

public boolean containsKey(Object key)

Checks if the specified session attribute with the given key exists. Note: Must use the same signature as AbstractMap.containsKey(java.lang.Object) to ensure the expected specialized behaviour is performed here (and not the generic ancestor behaviour).

Specified by:

containsKey in interface Map<String,Object>

Overrides:

containsKey in class AbstractMap<String,Object>

Parameters:

key - the name of the session attribute.

Returns:

true if the session attribute exits or false if it doesn't exist.