Package org.apache.shiro.util

Class MapContext

java.lang.Object

org.apache.shiro.util.MapContext

All Implemented Interfaces:

Serializable, Map<String,Object>

Direct Known Subclasses:

DefaultSessionContext, DefaultSubjectContext

public class MapContext
extends Object
implements Map<String,Object>, Serializable

A MapContext provides a common base for context-based data storage in a Map. Type-safe attribute retrieval is provided for subclasses with the getTypedValue(String, Class) method.

Since:

1.0

See Also:

SubjectContext, SessionContext, Serialized Form

Nested Class Summary

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

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
MapContext()
MapContext(Map<String,Object> map)

Method Summary

Modifier and Type	Method	Description
void	clear()
boolean	containsKey(Object o)
boolean	containsValue(Object o)
Set<Map.Entry<String,Object>>	entrySet()
Object	get(Object o)
protected <E> E	getTypedValue(String key, Class<E> type)	Performs a get operation but additionally ensures that the value returned is of the specified type.
boolean	isEmpty()
Set<String>	keySet()
protected void	nullSafePut(String key, Object value)	Places a value in this context map under the given key only if the given value argument is not null.
Object	put(String s, Object o)
void	putAll(Map<? extends String,?> map)
Object	remove(Object o)
int	size()
Collection<Object>	values()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

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

Constructor Detail

MapContext

public MapContext()

MapContext

public MapContext(Map<String,Object> map)

Method Detail

getTypedValue

protected <E> E getTypedValue(String key,
                              Class<E> type)

Performs a get operation but additionally ensures that the value returned is of the specified type. If there is no value, null is returned.

Type Parameters:

E - the expected type of the value

Parameters:

key - the attribute key to look up a value

type - the expected type of the value

Returns:

the typed value or null if the attribute does not exist.

nullSafePut

protected void nullSafePut(String key,
                           Object value)

Places a value in this context map under the given key only if the given value argument is not null.

Parameters:

key - the attribute key under which the non-null value will be stored

value - the non-null value to store. If null, this method does nothing and returns immediately.

size

public int size()

Specified by:

size in interface Map<String,Object>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<String,Object>

containsKey

public boolean containsKey(Object o)

Specified by:

containsKey in interface Map<String,Object>

containsValue

public boolean containsValue(Object o)

Specified by:

containsValue in interface Map<String,Object>

get

public Object get(Object o)

Specified by:

get in interface Map<String,Object>

put

public Object put(String s,
                  Object o)

Specified by:

put in interface Map<String,Object>

remove

public Object remove(Object o)

Specified by:

remove in interface Map<String,Object>

putAll

public void putAll(Map<? extends String,?> map)

Specified by:

putAll in interface Map<String,Object>

clear

public void clear()

Specified by:

clear in interface Map<String,Object>

keySet

public Set<String> keySet()

Specified by:

keySet in interface Map<String,Object>

values

public Collection<Object> values()

Specified by:

values in interface Map<String,Object>

entrySet

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

Specified by:

entrySet in interface Map<String,Object>