uk.ac.starlink.hapi

Class ParamReader

java.lang.Object

uk.ac.starlink.hapi.ParamReader

public class ParamReader
extends Object

Reads values specified by a particular parameter from a HAPI data stream. Instances of this class are safe for concurrent use from multiple threads.

Since:

12 Jan 2024

Author:

Mark Taylor

Method Summary

Modifier and Type	Method and Description
static ParamReader	createReader(HapiParam param) Returns a ParamReader instance for a given HAPI parameter.
int	getByteCount() Returns the number of bytes in a HAPI binary stream read by this reader.
int	getColumnCount() Returns the number of StarTable columns read by this reader.
ColumnInfo	getColumnInfo(int icol) Returns the column metadata for one of the StarTable columns read by this reader.
int	getFieldCount() Returns the number of HAPI table fields read by this reader.
void	readBinaryValues(byte[] buf, int istart, Object[] result) Converts from HAPI binary stream bytes to StarTable cell values.
void	readStringValues(String[] cells, int istart, Object[] result) Converts from HAPI CSV text cell values to StarTable cell values.

Methods inherited from class java.lang.Object

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

Method Detail

getColumnCount

public int getColumnCount()

Returns the number of StarTable columns read by this reader.

Returns:

STIL column count

getColumnInfo

public ColumnInfo getColumnInfo(int icol)

Returns the column metadata for one of the StarTable columns read by this reader.

Parameters:

icol - column index, in range 0..getColumnCount()

Returns:

column metadata

getFieldCount

public int getFieldCount()

Returns the number of HAPI table fields read by this reader.

Returns:

field count

getByteCount

public int getByteCount()

Returns the number of bytes in a HAPI binary stream read by this reader.

Returns:

binary stream byte read count

readStringValues

public void readStringValues(String[] cells,
                             int istart,
                             Object[] result)

Converts from HAPI CSV text cell values to StarTable cell values.

Parameters:

cells - array of CSV field values

istart - index of first CSV field of interest in cells

result - columnCount-element array into which output values will be written

readBinaryValues

public void readBinaryValues(byte[] buf,
                             int istart,
                             Object[] result)

Converts from HAPI binary stream bytes to StarTable cell values.

Parameters:

buf - buffer containing HAPI binary stream data

istart - index of first byte of interest in buffer

result - columnCount-element array into which output values will be written

createReader

public static ParamReader createReader(HapiParam param)

Returns a ParamReader instance for a given HAPI parameter.

Parameters:

param - HAPI parameter