ucar.nc2.iosp

Class IospHelper

java.lang.Object

ucar.nc2.iosp.IospHelper

public class IospHelper
extends Object

Helper methods for IOSP's for reading data.

Since:

Jan 3, 2008

Constructor Summary

Constructors

Constructor and Description
IospHelper()

Method Summary

Modifier and Type	Method and Description
static boolean[]	convertByteToBoolean(byte[] from)
static char[]	convertByteToChar(byte[] byteArray)
static char[]	convertByteToCharUTF(byte[] byteArray)
static byte[]	convertCharToByte(char[] from)
static byte[]	convertCharToByteUTF(char[] from)
static long	copyToByteChannel(Array data, WritableByteChannel channel) Copy data to a channel.
static long	copyToOutputStream(Array data, OutputStream out) Copy data to a OutputStream.
static Object	makePrimitiveArray(int size, DataType dataType) Create 1D primitive array of the given size and type
static Object	makePrimitiveArray(int size, DataType dataType, Object fillValue) Create 1D primitive array of the given size and type, fill it with the given value
static Object	readData(LayoutBB layout, DataType dataType, Object arr) Read data subset from ByteBuffer, place in given primitive array.
static Object	readData(ucar.unidata.io.PositioningDataInputStream raf, Layout index, DataType dataType, Object arr) Read data subset from PositioningDataInputStream, place in given primitive array.
static Object	readData(RandomAccessFile raf, Layout layout, DataType dataType, Object arr, int byteOrder, boolean convertChar) Read data subset from RandomAccessFile, place in given primitive array.
static Object	readDataFill(LayoutBB layout, DataType dataType, Object fillValue) Read data subset from ByteBuffer, create primitive array of size Layout.getTotalNelems.
static Object	readDataFill(ucar.unidata.io.PositioningDataInputStream is, Layout index, DataType dataType, Object fillValue) Read data subset from PositioningDataInputStream, create primitive array of size Layout.getTotalNelems.
static Object	readDataFill(RandomAccessFile raf, Layout index, DataType dataType, Object fillValue, int byteOrder) Read data subset from RandomAccessFile, create primitive array of size Layout.getTotalNelems.
static Object	readDataFill(RandomAccessFile raf, Layout index, DataType dataType, Object fillValue, int byteOrder, boolean convertChar)
static Array	readSection(ParsedSectionSpec cer)
static long	transferData(Array result, WritableByteChannel channel)

Methods inherited from class java.lang.Object

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

Constructor Detail

IospHelper

public IospHelper()

Method Detail

convertByteToBoolean

public static boolean[] convertByteToBoolean(byte[] from)

convertByteToChar

public static char[] convertByteToChar(byte[] byteArray)

convertByteToCharUTF

public static char[] convertByteToCharUTF(byte[] byteArray)

convertCharToByte

public static byte[] convertCharToByte(char[] from)

convertCharToByteUTF

public static byte[] convertCharToByteUTF(char[] from)

copyToByteChannel

public static long copyToByteChannel(Array data,
                                     WritableByteChannel channel)
                              throws IOException

Copy data to a channel. Used by ncstream. Not doing Structures correctly yet.

Parameters:

data - copy from here

channel - copy to here

Returns:

number of bytes copied

Throws:

IOException - on write error

copyToOutputStream

public static long copyToOutputStream(Array data,
                                      OutputStream out)
                               throws IOException

Copy data to a OutputStream. Used by ncstream. Not doing Structures correctly yet.

Parameters:

data - copy from here

out - copy to here

Returns:

number of bytes copied

Throws:

IOException - on write error

makePrimitiveArray

public static Object makePrimitiveArray(int size,
                                        DataType dataType)

Create 1D primitive array of the given size and type

Parameters:

size - the size of the array to create

dataType - dataType of the variable

Returns:

primitive array with data read in

makePrimitiveArray

public static Object makePrimitiveArray(int size,
                                        DataType dataType,
                                        Object fillValue)

Create 1D primitive array of the given size and type, fill it with the given value

Parameters:

size - the size of the array to create

dataType - dataType of the variable

fillValue - must be Number if dataType.isNumeric(), or String for STRING, byte[] for Structure, or null for none

Returns:

primitive array with data read in

readData

public static Object readData(LayoutBB layout,
                              DataType dataType,
                              Object arr)

Read data subset from ByteBuffer, place in given primitive array. Reading is controlled by the LayoutBB object.

Parameters:

layout - handles skipping around in the file, privide ByteBuffer to read from

dataType - dataType of the variable

arr - primitive array to read data into

Returns:

the primitive array with data read in

readData

public static Object readData(ucar.unidata.io.PositioningDataInputStream raf,
                              Layout index,
                              DataType dataType,
                              Object arr)
                       throws IOException

Read data subset from PositioningDataInputStream, place in given primitive array. Reading is controlled by the Layout object.

Parameters:

raf - read from here.

index - handles skipping around in the file.

dataType - dataType of the variable

arr - primitive array to read data into

Returns:

primitive array with data read in

Throws:

IOException - on read error

readData

public static Object readData(RandomAccessFile raf,
                              Layout layout,
                              DataType dataType,
                              Object arr,
                              int byteOrder,
                              boolean convertChar)
                       throws IOException

Read data subset from RandomAccessFile, place in given primitive array. Reading is controlled by the Layout object.

Parameters:

raf - read from here.

layout - handles skipping around in the file.

dataType - dataType of the variable

arr - primitive array to read data into

byteOrder - if equal to RandomAccessFile.ORDER_XXXX, set the byte order just before reading

convertChar - true if bytes should be converted to char for dataType CHAR

Returns:

primitive array with data read in

Throws:

IOException - on read error

readDataFill

public static Object readDataFill(LayoutBB layout,
                                  DataType dataType,
                                  Object fillValue)

Read data subset from ByteBuffer, create primitive array of size Layout.getTotalNelems. Reading is controlled by the Layout object.

Parameters:

layout - handles skipping around in the file, provide ByteBuffer to read from

dataType - dataType of the variable

fillValue - must be Number if dataType.isNumeric(), or String for STRING, byte[] for Structure, or null for none

Returns:

primitive array with data read in

readDataFill

public static Object readDataFill(ucar.unidata.io.PositioningDataInputStream is,
                                  Layout index,
                                  DataType dataType,
                                  Object fillValue)
                           throws IOException

Read data subset from PositioningDataInputStream, create primitive array of size Layout.getTotalNelems. Reading is controlled by the Layout object.

Parameters:

is - read from here.

index - handles skipping around in the file.

dataType - dataType of the variable

fillValue - must be Number if dataType.isNumeric(), or String for STRING, byte[] for Structure, or null for none

Returns:

primitive array with data read in

Throws:

IOException - on read error

readDataFill

public static Object readDataFill(RandomAccessFile raf,
                                  Layout index,
                                  DataType dataType,
                                  Object fillValue,
                                  int byteOrder)
                           throws IOException

Read data subset from RandomAccessFile, create primitive array of size Layout.getTotalNelems. Reading is controlled by the Layout object.

Parameters:

raf - read from here.

index - handles skipping around in the file.

dataType - dataType of the variable

fillValue - must be Number if dataType.isNumeric(), or String for STRING, byte[] for Structure, or null for none

byteOrder - if equal to RandomAccessFile.ORDER_XXXX, set the byte order just before reading

Returns:

primitive array with data read in

Throws:

IOException - on read error

readDataFill

public static Object readDataFill(RandomAccessFile raf,
                                  Layout index,
                                  DataType dataType,
                                  Object fillValue,
                                  int byteOrder,
                                  boolean convertChar)
                           throws IOException

Throws:

IOException

readSection

public static Array readSection(ParsedSectionSpec cer)
                         throws IOException,
                                InvalidRangeException

Throws:

IOException

InvalidRangeException

transferData

public static long transferData(Array result,
                                WritableByteChannel channel)
                         throws IOException

Throws:

IOException