程序包 cn.taketoday.core.env

接口 PropertyResolver

所有已知子接口:

ConfigurableEnvironment, ConfigurablePropertyResolver, Environment, IterablePropertyResolver

所有已知实现类:

AbstractEnvironment, AbstractPropertyResolver, MapPropertyResolver, PropertiesPropertyResolver, PropertyResolverComposite, PropertySourcesPropertyResolver, StandardEnvironment, TypedPropertyResolver

public interface PropertyResolver

Interface for resolving properties against any underlying source.

从以下版本开始:

4.0

作者:

Chris Beams, Juergen Hoeller

另请参阅:

• Environment
• PropertySourcesPropertyResolver

方法概要

修饰符和类型	方法	说明
boolean	containsProperty(String key)	Return whether the given property key is available for resolution, i.e. if the value for the given key is not null.
default boolean	getFlag(String key)	Retrieve the flag for the given property key.
default boolean	getFlag(String key, boolean defaultFlag)	Retrieve the flag for the given property key.
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 key, 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.
String	getRequiredProperty(String key)	Return the property value associated with the given key (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).

方法详细资料

containsProperty

boolean containsProperty(String key)

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

getProperty

@Nullable
String getProperty(String key)

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

参数:

key - the property name to resolve

另请参阅:

• 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.

参数:

key - the property name to resolve

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

另请参阅:

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

getProperty

@Nullable
<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.

参数:

key - the property name to resolve

targetType - the expected type of the property value

另请参阅:

• getRequiredProperty(String, Class)

getProperty

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

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

参数:

key - the property name to resolve

targetType - the expected type of the property value

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

另请参阅:

• getRequiredProperty(String, Class)

getRequiredProperty

String getRequiredProperty(String key)
                    throws IllegalStateException

Return the property value associated with the given key (never null).

抛出:

IllegalStateException - if the key cannot be resolved

另请参阅:

• 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).

抛出:

IllegalStateException - if the given key cannot be resolved

getFlag

default boolean getFlag(String key)

Retrieve the flag for the given property key.

参数:

key - the property key

返回:

true if the property is set to "true", false otherwise

getFlag

default boolean getFlag(String key,
 boolean defaultFlag)

Retrieve the flag for the given property key.

If there isn't a key returns defaultFlag

参数:

key - the property key

返回:

true if the property is set to "true", false otherwise ,If there isn't a key returns defaultFlag

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.

参数:

text - the String to resolve

返回:

the resolved String (never null)

抛出:

IllegalArgumentException - if given text is null

另请参阅:

• resolveRequiredPlaceholders(java.lang.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.

返回:

the resolved String (never null)

抛出:

IllegalArgumentException - if given text is null or if any placeholders are unresolvable