Interface IDataRowExpressionEvaluator

All Known Subinterfaces:
IGroupedDataRowExpressionEvaluator
All Known Implementing Classes:
AbstractGroupedDataRowExpressionEvaluator, DataRowExpressionEvaluatorAdapter

public interface IDataRowExpressionEvaluator
This interface provide expression evaluations of any string expression based on a row context. This is usually associated with an underlying resultset.
  • Method Summary

    Modifier and Type
    Method
    Description
    void
    Closes the underlying resultset.
    evaluate(String expression)
    Evaluates the expression based on the current row
    evaluateGlobal(String expression)
    Deprecated.
    Not used anymore.
    boolean
    Moves to the first row.
    boolean
    Moves to the next row.
  • Method Details

    • evaluate

      Object evaluate(String expression)
      Evaluates the expression based on the current row
      Parameters:
      A - String expression
      Returns:
      An Object representing the evaluated expression. The Object must be of a type String, Number, Date, Calendar, or it will be evaluated as a String using toString(). If there is any BirtException being caught by evaluation, the return value will be the caught BirtException.
    • evaluateGlobal

      @Deprecated Object evaluateGlobal(String expression)
      Deprecated.
      Not used anymore. use evaluate(String) instead.
      Evaluates the global expressions which are not associated with the data rows.
      Parameters:
      A - String expression
      Returns:
      An Object representing the evaluated expression. The Object must be of a type String, Number, Date, Calendar, or it will be evaluated as a String using toString().
    • first

      boolean first()
      Moves to the first row. Optional if already positioned on the first row when passed to Generator.bindData()
      Returns:
      true if the cursor is on a valid row; false if there are no rows in the result set
    • next

      boolean next()
      Moves to the next row.
      Returns:
      False if the last row has been reached. True otherwise.
    • close

      void close()
      Closes the underlying resultset. This is optional (it can be a no-op if the close is handled externally or not needed).