UserDataReader (Starjava TTOOLS API)

```
public interface UserDataReader
```
Reader that can interrogate a RowData to return the coordinate and mask values specified by a DataSpec. It is applied to a RowData obtained from the DataSpec's source table.
Instances of this object are not expected to be usable from multiple concurrent threads.

Since:

10 Feb 2013

Author:

Mark Taylor

See Also:

DataSpec

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`getMaskFlag(uk.ac.starlink.table.RowData rdata, long irow)`	Returns the mask flag for a row.
`java.lang.Object[]`	`getUserCoordValues(uk.ac.starlink.table.RowData rdata, long irow, int icoord)`	Returns a user coordinate value array for a given coordinate in a row.

- Method Detail
  - getMaskFlag
```
boolean getMaskFlag(uk.ac.starlink.table.RowData rdata,
                    long irow)
             throws java.io.IOException
```
    Returns the mask flag for a row.
    
    Parameters:
    
    rdata - row data for the row
    
    irow - row index of the row
    
    Returns:
    
    true iff the row of interest is included in the data set
    
    Throws:
    
    java.io.IOException
  - getUserCoordValues
```
java.lang.Object[] getUserCoordValues(uk.ac.starlink.table.RowData rdata,
                                      long irow,
                                      int icoord)
                               throws java.io.IOException
```
    Returns a user coordinate value array for a given coordinate in a row. The returned value is an array which may be re-used, so it should not be assumed to retain its contents between calls to this method.
    
    Parameters:
    
    rdata - row data
    
    irow - row index corresponding to the row
    
    icoord - coordinate index to read
    
    Returns:
    
    array of user values (not storage values) for the specified coordinate at the row of interest
    
    Throws:
    
    java.io.IOException