org.apache.tapestry5.ioc.services

## Interface SymbolProvider

- All Known Implementing Classes:
    ClasspathResourceSymbolProvider, ContextResourceSymbolProvider, DelegatingSymbolProvider, 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.
  See Also:
    `FactoryDefaults`, `ApplicationDefaults`

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and 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

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