uk.ac.starlink.ttools.jel
Class JELTable
java.lang.Object
uk.ac.starlink.table.WrapperStarTable
uk.ac.starlink.ttools.jel.JELTable
- All Implemented Interfaces:
- uk.ac.starlink.table.StarTable
public class JELTable
- extends uk.ac.starlink.table.WrapperStarTable
Wrapper table which is constructed entirely of columns defined by
JEL expressions based on the base table.
- Since:
- 1 Sep 2005
- Author:
- Mark Taylor
Fields inherited from class uk.ac.starlink.table.WrapperStarTable |
baseTable |
Constructor Summary |
JELTable(uk.ac.starlink.table.StarTable baseTable,
uk.ac.starlink.table.ColumnInfo[] colInfos,
String[] exprs)
Constructor. |
Methods inherited from class uk.ac.starlink.table.WrapperStarTable |
checkedLongToInt, getBaseTable, getColumnAuxDataInfos, getName, getParameterByName, getParameters, getRowCount, getURL, isRandom, setName, setParameter, setURL, toString |
JELTable
public JELTable(uk.ac.starlink.table.StarTable baseTable,
uk.ac.starlink.table.ColumnInfo[] colInfos,
String[] exprs)
throws gnu.jel.CompilationException
- Constructor.
The number of columns is the same as the number of elements of
colInfos
, which must be the same as the number of
elements in exprs
.
If the contentClass
attributes of the colInfos
elements are non-null, they must be compatible with the actual
types of the evaluated expressions. If they are not, an
IllegalArgumentException
will be thrown.
- Parameters:
baseTable
- table which provides both behaviour determining
whether random access is available etc, and an evaluation
context for the JEL calculationscolInfos
- column metadata for each of the columns
in this tableexprs
- JEL expressions, evaluated in a context determined
by baseTable
, which give the data for this table.
- Throws:
gnu.jel.CompilationException
getColumnCount
public int getColumnCount()
- Specified by:
getColumnCount
in interface uk.ac.starlink.table.StarTable
- Overrides:
getColumnCount
in class uk.ac.starlink.table.WrapperStarTable
getColumnInfo
public uk.ac.starlink.table.ColumnInfo getColumnInfo(int icol)
- Specified by:
getColumnInfo
in interface uk.ac.starlink.table.StarTable
- Overrides:
getColumnInfo
in class uk.ac.starlink.table.WrapperStarTable
getCell
public Object getCell(long irow,
int icol)
throws IOException
- Specified by:
getCell
in interface uk.ac.starlink.table.StarTable
- Overrides:
getCell
in class uk.ac.starlink.table.WrapperStarTable
- Throws:
IOException
getRow
public Object[] getRow(long irow)
throws IOException
- Specified by:
getRow
in interface uk.ac.starlink.table.StarTable
- Overrides:
getRow
in class uk.ac.starlink.table.WrapperStarTable
- Throws:
IOException
getRowSequence
public uk.ac.starlink.table.RowSequence getRowSequence()
throws IOException
- Specified by:
getRowSequence
in interface uk.ac.starlink.table.StarTable
- Overrides:
getRowSequence
in class uk.ac.starlink.table.WrapperStarTable
- Throws:
IOException
createJELTable
public static uk.ac.starlink.table.StarTable createJELTable(uk.ac.starlink.table.StarTable baseTable,
uk.ac.starlink.table.ValueInfo[] infos,
String[] exprs)
throws uk.ac.starlink.task.ExecutionException
- Convenience factory method. It turns all the supplied
infos
into ColumnInfos and rethrows any CompilationException as an
ExecutionException.
- Parameters:
baseTable
- table which provides both behaviour determining
whether random access is available etc, and an evaluation
context for the JEL calculationsinfos
- metadata used to construct column metadataexprs
- JEL expressions, evaluated in a context determined
by baseTable
, which give the data for this table.
- Throws:
uk.ac.starlink.task.ExecutionException
Copyright © 2009 Central Laboratory of the Research Councils. All Rights Reserved.