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## org.apache.tapestry5.ioc.services
Interface SymbolProvider

All Known Implementing Classes:
  ClasspathResourceSymbolProvider, ContextResourceSymbolProvider, MapSymbolProvider, ResourceSymbolProvider, ServletContextSymbolProvider, SingleKeySymbolProvider, SystemEnvSymbolProvider, SystemPropertiesSymbolProvider

    @UsesMappedConfiguration(value=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.

Method Summary
`java.lang.String` | `valueForSymbol(java.lang.String symbolName)` Returns the value for the symbol, or null if this provider can not provide a value.

Method Detail

### valueForSymbol

    java.lang.String valueForSymbol(java.lang.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

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