org.springframework.beans.factory.config

Class PropertyResourceConfigurer

java.lang.Object

org.springframework.core.io.support.PropertiesLoaderSupport

org.springframework.beans.factory.config.PropertyResourceConfigurer

All Implemented Interfaces:

BeanFactoryPostProcessor, Ordered, PriorityOrdered

Direct Known Subclasses:

PlaceholderConfigurerSupport, PropertyOverrideConfigurer

public abstract class PropertyResourceConfigurer
extends PropertiesLoaderSupport
implements BeanFactoryPostProcessor, PriorityOrdered

Allows for configuration of individual bean property values from a property resource, i.e. a properties file. Useful for custom config files targeted at system administrators that override bean properties configured in the application context.

Two concrete implementations are provided in the distribution:

• PropertyOverrideConfigurer for "beanName.property=value" style overriding (pushing values from a properties file into bean definitions)
• PropertyPlaceholderConfigurer for replacing "${...}" placeholders (pulling values from a properties file into bean definitions)

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

Since:

02.10.2003

Author:

Juergen Hoeller

See Also:

PropertyOverrideConfigurer, PropertyPlaceholderConfigurer

Field Summary

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
PropertyResourceConfigurer()

Method Summary

Modifier and Type	Method and Description
protected void	convertProperties(Properties props) Convert the given merged properties, converting property values if necessary.
protected String	convertProperty(String propertyName, String propertyValue) Convert the given property from the properties source to the value which should be applied.
protected String	convertPropertyValue(String originalValue) Convert the given property value from the properties source to the value which should be applied.
int	getOrder() Return the order value of this object, with a higher value meaning greater in terms of sorting.
void	postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) Merge, convert and process properties against the given bean factory.
protected abstract void	processProperties(ConfigurableListableBeanFactory beanFactory, Properties props) Apply the given Properties to the given BeanFactory.
void	setOrder(int order) Set the order value of this object for sorting purposes.

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

PropertyResourceConfigurer

public PropertyResourceConfigurer()

Method Detail

setOrder

public void setOrder(int order)

Set the order value of this object for sorting purposes.

See Also:

PriorityOrdered

getOrder

public int getOrder()

Description copied from interface: Ordered

Return the order value of this object, with a higher value meaning greater in terms of sorting.

Normally starting with 0, with Integer.MAX_VALUE indicating the greatest value. Same order values will result in arbitrary positions for the affected objects.

Higher values can be interpreted as lower priority. As a consequence, the object with the lowest value has highest priority (somewhat analogous to Servlet "load-on-startup" values).

Specified by:

getOrder in interface Ordered

Returns:

the order value

postProcessBeanFactory

public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)
                            throws BeansException

Merge, convert and process properties against the given bean factory.

Specified by:

postProcessBeanFactory in interface BeanFactoryPostProcessor

Parameters:

beanFactory - the bean factory used by the application context

Throws:

BeanInitializationException - if any properties cannot be loaded

BeansException - in case of errors

convertProperties

protected void convertProperties(Properties props)

Convert the given merged properties, converting property values if necessary. The result will then be processed.

The default implementation will invoke convertPropertyValue(java.lang.String) for each property value, replacing the original with the converted value.

Parameters:

props - the Properties to convert

See Also:

processProperties(org.springframework.beans.factory.config.ConfigurableListableBeanFactory, java.util.Properties)

convertProperty

protected String convertProperty(String propertyName,
                                 String propertyValue)

Convert the given property from the properties source to the value which should be applied.

The default implementation calls convertPropertyValue(String).

Parameters:

propertyName - the name of the property that the value is defined for

propertyValue - the original value from the properties source

Returns:

the converted value, to be used for processing

See Also:

convertPropertyValue(String)

convertPropertyValue

protected String convertPropertyValue(String originalValue)

Convert the given property value from the properties source to the value which should be applied.

The default implementation simply returns the original value. Can be overridden in subclasses, for example to detect encrypted values and decrypt them accordingly.

Parameters:

originalValue - the original value from the properties source (properties file or local "properties")

Returns:

the converted value, to be used for processing

See Also:

PropertiesLoaderSupport.setProperties(java.util.Properties), PropertiesLoaderSupport.setLocations(org.springframework.core.io.Resource...), PropertiesLoaderSupport.setLocation(org.springframework.core.io.Resource), convertProperty(String, String)

processProperties

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

Apply the given Properties to the given BeanFactory.

Parameters:

beanFactory - the BeanFactory used by the application context

props - the Properties to apply

Throws:

BeansException - in case of errors