org.springframework.core.env

Class ReadOnlySystemAttributesMap

java.lang.Object

org.springframework.core.env.ReadOnlySystemAttributesMap

All Implemented Interfaces:

java.util.Map<java.lang.String,java.lang.String>

abstract class ReadOnlySystemAttributesMap
extends java.lang.Object
implements java.util.Map<java.lang.String,java.lang.String>

Read-only Map<String, String> implementation that is backed by system properties or environment variables.

Used by AbstractApplicationContext when a SecurityManager prohibits access to System.getProperties() or System.getenv(). It is for this reason that the implementations of keySet(), entrySet(), and values() always return empty even though get(Object) may in fact return non-null if the current security manager allows access to individual keys.

Since:

3.0

Author:

Arjen Poutsma, Chris Beams

Nested Class Summary

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

java.util.Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
ReadOnlySystemAttributesMap()

Method Summary

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object value)
java.util.Set<java.util.Map.Entry<java.lang.String,java.lang.String>>	entrySet()
java.lang.String	get(java.lang.Object key)
protected abstract java.lang.String	getSystemAttribute(java.lang.String attributeName) Template method that returns the underlying system attribute.
boolean	isEmpty()
java.util.Set<java.lang.String>	keySet()
java.lang.String	put(java.lang.String key, java.lang.String value)
void	putAll(java.util.Map<? extends java.lang.String,? extends java.lang.String> map)
java.lang.String	remove(java.lang.Object key)
int	size()
java.util.Collection<java.lang.String>	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

ReadOnlySystemAttributesMap

ReadOnlySystemAttributesMap()

Method Detail

containsKey

public boolean containsKey(java.lang.Object key)

Specified by:

containsKey in interface java.util.Map<java.lang.String,java.lang.String>

get

public java.lang.String get(java.lang.Object key)

Specified by:

get in interface java.util.Map<java.lang.String,java.lang.String>

Parameters:

key - the name of the system attribute to retrieve

Throws:

java.lang.IllegalArgumentException - if given key is non-String

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Map<java.lang.String,java.lang.String>

getSystemAttribute

protected abstract java.lang.String getSystemAttribute(java.lang.String attributeName)

Template method that returns the underlying system attribute.

Implementations typically call System.getProperty(String) or System.getenv(String) here.

size

public int size()

Specified by:

size in interface java.util.Map<java.lang.String,java.lang.String>

put

public java.lang.String put(java.lang.String key,
                            java.lang.String value)

Specified by:

put in interface java.util.Map<java.lang.String,java.lang.String>

containsValue

public boolean containsValue(java.lang.Object value)

Specified by:

containsValue in interface java.util.Map<java.lang.String,java.lang.String>

remove

public java.lang.String remove(java.lang.Object key)

Specified by:

remove in interface java.util.Map<java.lang.String,java.lang.String>

clear

public void clear()

Specified by:

clear in interface java.util.Map<java.lang.String,java.lang.String>

keySet

public java.util.Set<java.lang.String> keySet()

Specified by:

keySet in interface java.util.Map<java.lang.String,java.lang.String>

putAll

public void putAll(java.util.Map<? extends java.lang.String,? extends java.lang.String> map)

Specified by:

putAll in interface java.util.Map<java.lang.String,java.lang.String>

values

public java.util.Collection<java.lang.String> values()

Specified by:

values in interface java.util.Map<java.lang.String,java.lang.String>

entrySet

public java.util.Set<java.util.Map.Entry<java.lang.String,java.lang.String>> entrySet()

Specified by:

entrySet in interface java.util.Map<java.lang.String,java.lang.String>