org.eclipse.viatra.query.runtime.matchers.psystem

## Interface IValueProvider

- All Known Implementing Classes:
    MatchingFrameValueProvider, TupleValueProvider

      public interface IValueProvider

  Helper interface to get values from a tuple of variables. All pattern matching engines are expected to implement this to handle their internal structures.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `java.lang.Object` | `getValue(java.lang.String variableName)` Returns the value of the selected variable

- - ### Method Detail

    - #### getValue

          java.lang.Object getValue(java.lang.String variableName)
                             throws java.lang.IllegalArgumentException

      Returns the value of the selected variable
      Parameters:
        `variableName` -
      Returns:
        the value of the variable; never null
      Throws:
        `java.lang.IllegalArgumentException` - if the variable is not defined