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## org.eclipse.birt.report.engine.extension
Interface IRowSet

    public interface IRowSet

defines an interface that wraps around a row set.

Method Summary
`void` | `close()` clse the row set
`java.lang.Object` | `evaluate(java.lang.String expr)` evaluate the expression using current row.
`int` | `getEndingGroupLevel()` Returns the 1-based index of the outermost group in which the current row is the first row.
`IRowMetaData` | `getMetaData()` returns the definition for the data row
`int` | `getStartingGroupLevel()` Returns the 1-based index of the outermost group in which the current row is the last row.
`boolean` | `isEmpty()` Judges if the IRowSet is empty or not
`boolean` | `next()` move the row to next.

Method Detail

### getMetaData

    IRowMetaData getMetaData()

  returns the definition for the data row

  Returns:
    the definition for the data row

### next

    boolean next()

  move the row to next.

  Returns:
    true successful, false for no more rows

### getStartingGroupLevel

    int getStartingGroupLevel()

  Returns the 1-based index of the outermost group in which the current row is the last row. For example, if a query contain N groups (group with index 1 being the outermost group, and group with index N being the innermost group), and this function returns a value M, it indicates that the current row is the last row in groups with indexes (M, M+1, ..., N ). -1 represents current row is a detail row. 0 represents the end of whole resultset

  Returns:
    1-based index of the outermost group in which the current row is the first row; (N+1) if the current row is not at the start of any group; 0 if the result set has no groups.

### getEndingGroupLevel

    int getEndingGroupLevel()

  Returns the 1-based index of the outermost group in which the current row is the first row. For example, if a query contain N groups (group with index 1 being the outermost group, and group with index N being the innermost group), and this function returns a value M, it indicates that the current row is the first row in groups with indexes (M, M+1, ..., N ).

  Returns:
    1-based index of the outermost group in which the current row is the first row; (N+1) if the current row is not at the start of any group; 0 if the result set has no groups.

### evaluate

    java.lang.Object evaluate(java.lang.String expr)

  evaluate the expression using current row.

  Parameters:
    `expr` - expression, must be prepared in DTE.prepared().
  Returns:
    result of the expression.

### close

    void close()

  clse the row set

### isEmpty

    boolean isEmpty()
                    throws BirtException

  Judges if the IRowSet is empty or not

  Returns:
    true if IRowSet is empty. false if it is not empty.
  Throws:
    `BirtException`

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