public class PermutedColumnSupplement extends java.lang.Object implements ColumnSupplement
An int[] array, colMap, is used to keep track of which columns in this table correspond to which columns in the base table; the i'th column in this table corresponds to the colMap[i]'th column in the base table. The colMap array may contain duplicate entries, but all its entries must be in the range 0..baseSup.getColumnCount()-1. This table will have colMap.length columns.
Constructor and Description |
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PermutedColumnSupplement(ColumnSupplement baseSup,
int[] colMap)
Constructs a permuted column supplement based on a given
column supplement.
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PermutedColumnSupplement(uk.ac.starlink.table.StarTable baseTable,
int[] colMap)
Constructs a permuted column supplement based on a given table.
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Modifier and Type | Method and Description |
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SupplementSequence |
createSequence(uk.ac.starlink.table.RowSequence rseq)
Returns a new iterator over the values in the columns defined by
this object.
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java.lang.Object |
getCell(long irow,
int icol)
Random access read of a cell defined by this object.
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int |
getColumnCount()
Returns the number of columns defined by this object.
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uk.ac.starlink.table.ColumnInfo |
getColumnInfo(int icol)
Returns the column metadata object for a given column.
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java.lang.Object[] |
getRow(long irow)
Random access read of a row defined by this object.
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public PermutedColumnSupplement(ColumnSupplement baseSup, int[] colMap)
baseSup
- column supplement supplying the base datacolMap
- array of column indices, one for each column in this
objectpublic PermutedColumnSupplement(uk.ac.starlink.table.StarTable baseTable, int[] colMap)
baseTable
- table supplying the base datacolMap
- array of column indices, one for each column in this
objectpublic int getColumnCount()
ColumnSupplement
getColumnCount
in interface ColumnSupplement
public uk.ac.starlink.table.ColumnInfo getColumnInfo(int icol)
ColumnSupplement
getColumnInfo
in interface ColumnSupplement
icol
- column index within this objectpublic java.lang.Object getCell(long irow, int icol) throws java.io.IOException
ColumnSupplement
getCell
in interface ColumnSupplement
irow
- row indexicol
- column indexjava.io.IOException
public java.lang.Object[] getRow(long irow) throws java.io.IOException
ColumnSupplement
getRow
in interface ColumnSupplement
irow
- row indexjava.io.IOException
public SupplementSequence createSequence(uk.ac.starlink.table.RowSequence rseq) throws java.io.IOException
ColumnSupplement
createSequence
in interface ColumnSupplement
rseq
- row sequence providing data from the host tablejava.io.IOException
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