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PreferencesPlaceholderConfigurer (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.beans.factory.config
Class PreferencesPlaceholderConfigurer

java.lang.Object
  org.springframework.core.io.support.PropertiesLoaderSupport
      org.springframework.beans.factory.config.PropertyResourceConfigurer
          org.springframework.beans.factory.config.PropertyPlaceholderConfigurer
              org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer

All Implemented Interfaces:

BeanFactoryAware, BeanNameAware, BeanFactoryPostProcessor, InitializingBean, Ordered

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public class PreferencesPlaceholderConfigurer
extends PropertyPlaceholderConfigurer
implements InitializingBean

Subclass of PropertyPlaceholderConfigurer that supports JDK 1.4's Preferences API (java.util.prefs).

Tries to resolve placeholders as keys first in the user preferences, then in the system preferences, then in this configurer's properties. Thus, behaves like PropertyPlaceholderConfigurer if no corresponding preferences defined.

Supports custom paths for the system and user preferences trees. Also supports custom paths specified in placeholders ("myPath/myPlaceholderKey"). Uses the respective root node if not specified.

Since:

16.02.2004

Author:

Juergen Hoeller

See Also:

setSystemTreePath(java.lang.String), setUserTreePath(java.lang.String), Preferences

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Field Summary

 

Fields inherited from class org.springframework.beans.factory.config.PropertyPlaceholderConfigurer
DEFAULT_PLACEHOLDER_PREFIX, DEFAULT_PLACEHOLDER_SUFFIX, SYSTEM_PROPERTIES_MODE_FALLBACK, SYSTEM_PROPERTIES_MODE_NEVER, SYSTEM_PROPERTIES_MODE_OVERRIDE

 

Fields inherited from class org.springframework.core.io.support.PropertiesLoaderSupport
logger, XML_FILE_EXTENSION

 

Fields inherited from interface org.springframework.core.Ordered
HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

 

Constructor Summary
PreferencesPlaceholderConfigurer()

 

Method Summary
void	afterPropertiesSet()           This implementation eagerly fetches the Preferences instances for the required system and user tree nodes.
protected  String	resolvePlaceholder(String placeholder, Properties props)           This implementation tries to resolve placeholders as keys first in the user preferences, then in the system preferences, then in the passed-in properties.
protected  String	resolvePlaceholder(String path, String key, Preferences preferences)           Resolve the given path and key against the given Preferences.
void	setSystemTreePath(String systemTreePath)           Set the path in the system preferences tree to use for resolving placeholders.
void	setUserTreePath(String userTreePath)           Set the path in the system preferences tree to use for resolving placeholders.

 

Methods inherited from class org.springframework.beans.factory.config.PropertyPlaceholderConfigurer
parseStringValue, processProperties, resolvePlaceholder, resolveSystemProperty, setBeanFactory, setBeanName, setIgnoreUnresolvablePlaceholders, setPlaceholderPrefix, setPlaceholderSuffix, setSearchSystemEnvironment, setSystemPropertiesMode, setSystemPropertiesModeName

 

Methods inherited from class org.springframework.beans.factory.config.PropertyResourceConfigurer
convertProperties, convertPropertyValue, getOrder, postProcessBeanFactory, setOrder

 

Methods inherited from class org.springframework.core.io.support.PropertiesLoaderSupport
loadProperties, mergeProperties, setFileEncoding, setIgnoreResourceNotFound, setLocalOverride, setLocation, setLocations, setProperties, setPropertiesArray, setPropertiesPersister

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

PreferencesPlaceholderConfigurer

public PreferencesPlaceholderConfigurer()

Method Detail

setSystemTreePath

public void setSystemTreePath(String systemTreePath)

Set the path in the system preferences tree to use for resolving placeholders. Default is the root node.

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setUserTreePath

public void setUserTreePath(String userTreePath)

Set the path in the system preferences tree to use for resolving placeholders. Default is the root node.

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afterPropertiesSet

public void afterPropertiesSet()

This implementation eagerly fetches the Preferences instances for the required system and user tree nodes.

Specified by:

afterPropertiesSet in interface InitializingBean

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resolvePlaceholder

protected String resolvePlaceholder(String placeholder,
                                    Properties props)

This implementation tries to resolve placeholders as keys first in the user preferences, then in the system preferences, then in the passed-in properties.

Overrides:

resolvePlaceholder in class PropertyPlaceholderConfigurer

Parameters:

placeholder - the placeholder to resolve

props - the merged properties of this configurer

Returns:

the resolved value, of null if none

See Also:

PropertyPlaceholderConfigurer.setSystemPropertiesMode(int)

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resolvePlaceholder

protected String resolvePlaceholder(String path,
                                    String key,
                                    Preferences preferences)

Resolve the given path and key against the given Preferences.

Parameters:

path - the preferences path (placeholder part before '/')

key - the preferences key (placeholder part after '/')

preferences - the Preferences to resolve against

Returns:

the value for the placeholder, or null if none found

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