uk.ac.starlink.table.jdbc

Class RandomResultSetStarTable

java.lang.Object

uk.ac.starlink.table.AbstractStarTable

uk.ac.starlink.table.RandomStarTable

uk.ac.starlink.table.jdbc.RandomResultSetStarTable

All Implemented Interfaces:

StarTable

public class RandomResultSetStarTable
extends RandomStarTable

StarTable implementation based on a random-access ResultSet. Such results sets have a type of ResultSet.TYPE_SCROLL_* and are generally produced from by using a Statement which has been constructed using corresponding type. This implementation is thread-safe.

Since:

23 Jul 2007

Constructor Summary

Constructors

Constructor and Description
RandomResultSetStarTable(java.sql.ResultSet rset) Constructor.
RandomResultSetStarTable(StarResultSet srset) Constructor.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	getCell(long lrow, int icol) The AbstractStarTable implementation of this method throws an UnsupportedOperationException, since unless otherwise provided there is no random access.
java.util.List<ValueInfo>	getColumnAuxDataInfos() Goes through the table columns (ColumnInfo objects) and picks out all the AuxData items which exist, generalising where necessary and returning a union of them in alphabetical order by name.
int	getColumnCount() Returns the number of columns in this table.
ColumnInfo	getColumnInfo(int icol) Returns the object describing the data in a given column.
java.sql.ResultSet	getResultSet() Returns the result set on which this table is built.
java.lang.Object[]	getRow(long lrow) The AbstractStarTable implementation of this method constructs a row by repeated invocation of AbstractStarTable.getCell(long, int).
long	getRowCount() The number of rows in this table.

Methods inherited from class uk.ac.starlink.table.RandomStarTable

getRowSequence, isRandom

Methods inherited from class uk.ac.starlink.table.AbstractStarTable

checkedLongToInt, getName, getParameterByName, getParameters, getURL, setName, setParameter, setParameters, setURL

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RandomResultSetStarTable

public RandomResultSetStarTable(java.sql.ResultSet rset)
                         throws java.sql.SQLException

Constructor.

Parameters:

rset - result set containing data

Throws:

java.lang.IllegalArgumentException - if rset is not random access

java.sql.SQLException

RandomResultSetStarTable

public RandomResultSetStarTable(StarResultSet srset)

Constructor.

Parameters:

srset - result set containing data

Throws:

java.lang.IllegalArgumentException - if srset is not random access

Method Detail

getResultSet

public java.sql.ResultSet getResultSet()

Returns the result set on which this table is built.

Returns:

result set

getColumnCount

public int getColumnCount()

Description copied from interface: StarTable

Returns the number of columns in this table.

Specified by:

getColumnCount in interface StarTable

Specified by:

getColumnCount in class AbstractStarTable

Returns:

the number of columns

getColumnInfo

public ColumnInfo getColumnInfo(int icol)

Description copied from interface: StarTable

Returns the object describing the data in a given column.

Specified by:

getColumnInfo in interface StarTable

Specified by:

getColumnInfo in class AbstractStarTable

Parameters:

icol - the column for which header information is required

Returns:

a ValueInfo object for column icol

getRowCount

public long getRowCount()

Description copied from class: RandomStarTable

The number of rows in this table. Implementations must supply a non-negative return value.

Specified by:

getRowCount in interface StarTable

Specified by:

getRowCount in class RandomStarTable

Returns:

the number of rows in the table

getColumnAuxDataInfos

public java.util.List<ValueInfo> getColumnAuxDataInfos()

Description copied from class: AbstractStarTable

Goes through the table columns (ColumnInfo objects) and picks out all the AuxData items which exist, generalising where necessary and returning a union of them in alphabetical order by name. Subclasses should override this if they can do better, for instance providing an order for the keys.

Specified by:

getColumnAuxDataInfos in interface StarTable

Overrides:

getColumnAuxDataInfos in class AbstractStarTable

Returns:

a list of all the auxiliary metadata ValueInfo items which in fact crop up in column metadata

See Also:

ColumnInfo.getAuxData()

getCell

public java.lang.Object getCell(long lrow,
                                int icol)
                         throws java.io.IOException

Description copied from class: AbstractStarTable

The AbstractStarTable implementation of this method throws an UnsupportedOperationException, since unless otherwise provided there is no random access.

Specified by:

getCell in interface StarTable

Overrides:

getCell in class AbstractStarTable

Parameters:

lrow - the index of the cell's row

icol - the index of the cell's column

Returns:

the contents of this cell

Throws:

java.io.IOException - if there is an error reading the data

getRow

public java.lang.Object[] getRow(long lrow)
                          throws java.io.IOException

Description copied from class: AbstractStarTable

The AbstractStarTable implementation of this method constructs a row by repeated invocation of AbstractStarTable.getCell(long, int).

Specified by:

getRow in interface StarTable

Overrides:

getRow in class AbstractStarTable

Parameters:

lrow - the index of the row to retrieve

Returns:

an array of the objects in each cell in row irow

Throws:

java.io.IOException - if there is an error reading the data