SymbolProvider (Tapestry API - 5.7.2)乐学网一站式学习平台

All Known Implementing Classes:

ClasspathResourceSymbolProvider, ContextResourceSymbolProvider, DelegatingSymbolProvider, MapSymbolProvider, ResourceSymbolProvider, ServletContextSymbolProvider, SingleKeySymbolProvider, SystemEnvSymbolProvider, SystemPropertiesSymbolProvider
```
@UsesMappedConfiguration(java.lang.String.class)
public interface SymbolProvider
```
A provider of values for symbols, used by the SymbolSource service. This is the service interface for the FactoryDefaults and ApplicationDefaults services; each of these takes a configuration mapping symbols to their values.

See Also:

FactoryDefaults, ApplicationDefaults

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`valueForSymbol(String symbolName)`	Returns the value for the symbol, or null if this provider can not provide a value.

- Method Detail
  - valueForSymbol
```
String valueForSymbol(String symbolName)
```
    Returns the value for the symbol, or null if this provider can not provide a value. The value itself may contain symbols that will be recursively expanded.
    
    Parameters:
    
    symbolName -
    
    Returns:
    
    the value or null