org.springframework.core.env
Interface PropertyResolver

All Known Subinterfaces:

ConfigurableEnvironment, ConfigurablePropertyResolver, ConfigurableWebEnvironment, Environment

All Known Implementing Classes:

AbstractEnvironment, AbstractPropertyResolver, PropertySourcesPropertyResolver, StandardEnvironment, StandardPortletEnvironment, StandardServletEnvironment

public interface PropertyResolver

Interface for resolving properties against any underlying source.

Since:

3.1

Author:

Chris Beams

See Also:

Environment, PropertySourcesPropertyResolver

Method Summary

boolean	containsProperty(String key) Return whether the given property key is available for resolution, i.e., the value for the given key is not null.
String	getProperty(String key) Return the property value associated with the given key, or null if the key cannot be resolved.
<T> T	getProperty(String key, Class<T> targetType) Return the property value associated with the given key, or null if the key cannot be resolved.
<T> T	getProperty(String string, Class<T> targetType, T defaultValue) Return the property value associated with the given key, or defaultValue if the key cannot be resolved.
String	getProperty(String key, String defaultValue) Return the property value associated with the given key, or defaultValue if the key cannot be resolved.
<T> Class<T>	getPropertyAsClass(String key, Class<T> targetType) Convert the property value associated with the given key to a Class of type T or null if the key cannot be resolved.
String	getRequiredProperty(String key) Return the property value associated with the given key, converted to the given targetType (never null).
<T> T	getRequiredProperty(String key, Class<T> targetType) Return the property value associated with the given key, converted to the given targetType (never null).
String	resolvePlaceholders(String text) Resolve ${...} placeholders in the given text, replacing them with corresponding property values as resolved by getProperty(java.lang.String).
String	resolveRequiredPlaceholders(String text) Resolve ${...} placeholders in the given text, replacing them with corresponding property values as resolved by getProperty(java.lang.String).

Method Detail

containsProperty

boolean containsProperty(String key)

Return whether the given property key is available for resolution, i.e., the value for the given key is not null.

getProperty

String getProperty(String key)

Return the property value associated with the given key, or null if the key cannot be resolved.

Parameters:

key - the property name to resolve

See Also:

getProperty(String, String), getProperty(String, Class), getRequiredProperty(String)

getProperty

String getProperty(String key,
                   String defaultValue)

Return the property value associated with the given key, or defaultValue if the key cannot be resolved.

Parameters:

key - the property name to resolve

defaultValue - the default value to return if no value is found

See Also:

getRequiredProperty(String), getProperty(String, Class)

getProperty

<T> T getProperty(String key,
                  Class<T> targetType)

Return the property value associated with the given key, or null if the key cannot be resolved.

Parameters:

key - the property name to resolve

T - the expected type of the property value

See Also:

getRequiredProperty(String, Class)

getProperty

<T> T getProperty(String string,
                  Class<T> targetType,
                  T defaultValue)

Return the property value associated with the given key, or defaultValue if the key cannot be resolved.

Parameters:

key - the property name to resolve

T - the expected type of the property value

defaultValue - the default value to return if no value is found

See Also:

getRequiredProperty(String, Class)

getPropertyAsClass

<T> Class<T> getPropertyAsClass(String key,
                                Class<T> targetType)

Convert the property value associated with the given key to a Class of type T or null if the key cannot be resolved.

Throws:

ConversionException - if class specified by property value cannot be found or loaded or if targetType is not assignable from class specified by property value

See Also:

getProperty(String, Class)

getRequiredProperty

String getRequiredProperty(String key)
                           throws IllegalStateException

Return the property value associated with the given key, converted to the given targetType (never null).

Throws:

IllegalStateException - if the key cannot be resolved

See Also:

getRequiredProperty(String, Class)

getRequiredProperty

<T> T getRequiredProperty(String key,
                          Class<T> targetType)
                      throws IllegalStateException

Return the property value associated with the given key, converted to the given targetType (never null).

Throws:

IllegalStateException - if the given key cannot be resolved

resolvePlaceholders

String resolvePlaceholders(String text)

Resolve ${...} placeholders in the given text, replacing them with corresponding property values as resolved by getProperty(java.lang.String). Unresolvable placeholders with no default value are ignored and passed through unchanged.

Parameters:

text - the String to resolve

Returns:

the resolved String (never null)

Throws:

IllegalArgumentException - if given text is null

See Also:

resolveRequiredPlaceholders(java.lang.String), SystemPropertyUtils.resolvePlaceholders(String)

resolveRequiredPlaceholders

String resolveRequiredPlaceholders(String text)
                                   throws IllegalArgumentException

Resolve ${...} placeholders in the given text, replacing them with corresponding property values as resolved by getProperty(java.lang.String). Unresolvable placeholders with no default value will cause an IllegalArgumentException to be thrown.

Returns:

the resolved String (never null)

Throws:

IllegalArgumentException - if given text is null

IllegalArgumentException - if any placeholders are unresolvable

See Also:

SystemPropertyUtils.resolvePlaceholders(String, boolean)