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.PlaceholderConfigurerSupport

org.springframework.beans.factory.config.PropertyPlaceholderConfigurer

org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer

All Implemented Interfaces:

Aware, BeanFactoryAware, BeanNameAware, BeanFactoryPostProcessor, InitializingBean, Ordered, PriorityOrdered

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

Field Summary

Fields inherited from class org.springframework.beans.factory.config.PropertyPlaceholderConfigurer

SYSTEM_PROPERTIES_MODE_FALLBACK, SYSTEM_PROPERTIES_MODE_NEVER, SYSTEM_PROPERTIES_MODE_OVERRIDE

Fields inherited from class org.springframework.beans.factory.config.PlaceholderConfigurerSupport

DEFAULT_PLACEHOLDER_PREFIX, DEFAULT_PLACEHOLDER_SUFFIX, DEFAULT_VALUE_SEPARATOR, ignoreUnresolvablePlaceholders, nullValue, placeholderPrefix, placeholderSuffix, trimValues, valueSeparator

Fields inherited from class org.springframework.core.io.support.PropertiesLoaderSupport

localOverride, localProperties, logger

Fields inherited from interface org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

Constructor Summary

Constructors

Constructor and Description
PreferencesPlaceholderConfigurer()

Method Summary

Modifier and Type	Method and Description
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

processProperties, resolvePlaceholder, resolveSystemProperty, setSearchSystemEnvironment, setSystemPropertiesMode, setSystemPropertiesModeName

Methods inherited from class org.springframework.beans.factory.config.PlaceholderConfigurerSupport

doProcessProperties, setBeanFactory, setBeanName, setIgnoreUnresolvablePlaceholders, setNullValue, setPlaceholderPrefix, setPlaceholderSuffix, setTrimValues, setValueSeparator

Methods inherited from class org.springframework.beans.factory.config.PropertyResourceConfigurer

convertProperties, convertProperty, 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.

setUserTreePath

public void setUserTreePath(String userTreePath)

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

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

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)

resolvePlaceholder

@Nullable
protected String resolvePlaceholder(@Nullable
                                              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