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## org.kie.api.runtime.process
Interface DataTransformer

    public interface DataTransformer

Data transformation capabilities used by data input and data output transformation as part of BPMN2 process definition. It allows plugable implementations.

Method Summary
`Object` | `compile(String expression, Map<String,Object> parameters)` Compiles given expression into reusable unit.
`Object` | `transform(Object expression, Map<String,Object> parameters)` Transforms the given expression object (might be compiled expression) using `parameters` as contextual information (aka bindings) used during evaluation of the expression.

Method Detail

### compile

    Object compile(String expression,
                   Map<String,Object> parameters)

  Compiles given expression into reusable unit. This is optional operation and in case it's not supported by given transformed it should return the same expression that was given in the input. If compilation is supported a compiled instance of the expression should be returned.

  Parameters:
    `expression` - language specific expression
    `parameters` - parameters e.g. imports defined in the process
  Returns:
    compiled expression instance or same as given as argument expression
  Throws:
    `RuntimeException` - in case of unexpected errors during compilation

### transform

    Object transform(Object expression,
                     Map<String,Object> parameters)

  Transforms the given expression object (might be compiled expression) using `parameters` as contextual information (aka bindings) used during evaluation of the expression.

  Parameters:
    `expression` - expression to evaluate
    `parameters` - binding parameters
  Returns:
    result of the evaluation
  Throws:
    `RuntimeException` - in case of unexpected errors during evaluation of the expression

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