org.springframework.beans.factory.config
Class PropertyOverrideConfigurer

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

All Implemented Interfaces:

BeanFactoryPostProcessor, Ordered, PriorityOrdered

public class PropertyOverrideConfigurer
extends PropertyResourceConfigurer

Property resource configurer that overrides bean property values in an application context definition. It pushes values from a properties file into bean definitions.

Configuration lines are expected to be of the following form:

beanName.property=value

Example properties file:

dataSource.driverClassName=com.mysql.jdbc.Driver
 dataSource.url=jdbc:mysql:mydb

In contrast to PropertyPlaceholderConfigurer, the original definition can have default values or no values at all for such bean properties. If an overriding properties file does not have an entry for a certain bean property, the default context definition is used.

Note that the context definition is not aware of being overridden; so this is not immediately obvious when looking at the XML definition file. Furthermore, note that specified override values are always literal values; they are not translated into bean references. This also applies when the original value in the XML bean definition specifies a bean reference.

In case of multiple PropertyOverrideConfigurers that define different values for the same bean property, the last one will win (due to the overriding mechanism).

Property values can be converted after reading them in, through overriding the convertPropertyValue method. For example, encrypted values can be detected and decrypted accordingly before processing them.

Since:

12.03.2003

Author:

Juergen Hoeller, Rod Johnson

See Also:

PropertyResourceConfigurer.convertPropertyValue(java.lang.String), PropertyPlaceholderConfigurer

Field Summary

static String

DEFAULT_BEAN_NAME_SEPARATOR

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

PropertyOverrideConfigurer()

Method Summary

protected void	applyPropertyValue(ConfigurableListableBeanFactory factory, String beanName, String property, String value) Apply the given property value to the corresponding bean.
boolean	hasPropertyOverridesFor(String beanName) Were there overrides for this bean?
protected void	processKey(ConfigurableListableBeanFactory factory, String key, String value) Process the given key as 'beanName.property' entry.
protected void	processProperties(ConfigurableListableBeanFactory beanFactory, Properties props) Apply the given Properties to the given BeanFactory.
void	setBeanNameSeparator(String beanNameSeparator) Set the separator to expect between bean name and property path.
void	setIgnoreInvalidKeys(boolean ignoreInvalidKeys) Set whether to ignore invalid keys.

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

Field Detail

DEFAULT_BEAN_NAME_SEPARATOR

public static final String DEFAULT_BEAN_NAME_SEPARATOR

See Also:

Constant Field Values

Constructor Detail

PropertyOverrideConfigurer

public PropertyOverrideConfigurer()

Method Detail

setBeanNameSeparator

public void setBeanNameSeparator(String beanNameSeparator)

Set the separator to expect between bean name and property path. Default is a dot (".").

setIgnoreInvalidKeys

public void setIgnoreInvalidKeys(boolean ignoreInvalidKeys)

Set whether to ignore invalid keys. Default is "false".

If you ignore invalid keys, keys that do not follow the 'beanName.property' format will just be logged as warning. This allows to have arbitrary other keys in a properties file.

processProperties

protected void processProperties(ConfigurableListableBeanFactory beanFactory,
                                 Properties props)
                          throws BeansException

Description copied from class: PropertyResourceConfigurer

Apply the given Properties to the given BeanFactory.

Specified by:

processProperties in class PropertyResourceConfigurer

Parameters:

beanFactory - the BeanFactory used by the application context

props - the Properties to apply

Throws:

BeansException - in case of errors

processKey

protected void processKey(ConfigurableListableBeanFactory factory,
                          String key,
                          String value)
                   throws BeansException

Process the given key as 'beanName.property' entry.

Throws:

BeansException

applyPropertyValue

protected void applyPropertyValue(ConfigurableListableBeanFactory factory,
                                  String beanName,
                                  String property,
                                  String value)

Apply the given property value to the corresponding bean.

hasPropertyOverridesFor

public boolean hasPropertyOverridesFor(String beanName)

Were there overrides for this bean? Only valid after processing has occurred at least once.

Parameters:

beanName - name of the bean to query status for

Returns:

whether there were property overrides for the named bean