Package ucar.nc2.iosp.gempak

Class GempakFileReader

java.lang.Object

ucar.nc2.iosp.gempak.GempakFileReader

All Implemented Interfaces:

GempakConstants

Direct Known Subclasses:

AbstractGempakStationFileReader, GempakGridReader

public class GempakFileReader
extends Object
implements GempakConstants

Read a Gempak grid file

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	GempakFileReader.DMFileHeaderInfo	Class to hold the DM File header info
protected static class	GempakFileReader.DMHeaders	Class to mimic the DMHDRS common block.
protected class	GempakFileReader.DMKeys	Class to mimic the DMKEYS common block.
protected static class	GempakFileReader.DMParam	Class to hold DM Parameter info
protected static class	GempakFileReader.DMPart	Class to mimic the DMKEYS common block.
protected static class	GempakFileReader.Key	Class to hold information about a key.
protected static class	GempakFileReader.PackingInfo	Class to hold DM Integer packing info
static class	GempakFileReader.RData	A class to hold real (float) data

Field Summary

Fields

Modifier and Type	Field	Description
protected ucar.nc2.iosp.gempak.GempakFileReader.DMLabel	dmLabel	The label common param
protected List<GempakFileReader.DMFileHeaderInfo>	fileHeaderInfo	header info
protected long	fileSize	file size
protected GempakFileReader.DMHeaders	headers	headers
protected GempakFileReader.DMKeys	keys	key
protected int	MTMACH	the machine type byte order
protected boolean	mvmst	swap flag
protected boolean	needToSwap	swap flag
protected List<GempakFileReader.DMPart>	parts	part
protected RandomAccessFile	rf	The file

Fields inherited from interface ucar.nc2.iosp.gempak.GempakConstants

COL, IMISSD, LLGDHD, LLNANL, LLNNAV, LLSTHL, MBLKSZ, MDCHAR, MDGDEC, MDGDIF, MDGGRB, MDGNMC, MDGNON, MDGRB2, MDGRID, MDINTG, MDREAL, MDRPCK, MFGD, MFSF, MFSN, MTALPH, MTAPOL, MTHP, MTIBM, MTIGPH, MTIRIS, MTLNUX, MTSUN, MTULTX, MTVAX, RDIFFD, RMISSD, ROW

Method Summary

Modifier and Type	Method	Description
GempakFileReader.RData	DM_RDTR(int irow, int icol, String partName)	Read the data
GempakFileReader.RData	DM_RDTR(int irow, int icol, String partName, int decimalScale)	Read the real (float) data
float	DM_RFLT(int word)	Read a float
void	DM_RFLT(int word, float[] rarray)	Convenience method to fully read into an array of floats
void	DM_RFLT(int word, int num, float[] rarray, int start)	Read into an array of ints.
int	DM_RINT(int word)	Read an integer
void	DM_RINT(int word, int[] iarray)	Convenience method to fully read into an array of ints
void	DM_RINT(int word, int num, int[] iarray, int start)	Read into an array of ints.
float[]	DM_RPKG(int isword, int nword, int decimalScale)	subclass should implement
String	DM_RSTR(int isword)	Read a 4-byte String
String	DM_RSTR(int isword, int nchar)	Read a String
float[]	DM_UNPK(GempakFileReader.DMPart part, int[] ibitst)	Unpack an array of packed integers.
GempakFileReader.DMFileHeaderInfo	findFileHeader(String name)	Find the file header with this name
GempakFileReader.Key	findKey(String name)	Find a key with the given name
protected static String	getBits(int b)	Get a bit string for an integer
int	getByteOrder()	Get the byte order for this system
int	getByteOrder(int kmachn)	Get the byte order for the machine type.
int	getDataPointer(int irow, int icol, String partName)	Get the pointer to the data.
String	getErrorMessage()
static RandomAccessFile	getFile(String filename)	Get a RandomAccessFile for the file location
float[]	getFileHeader(String name)	Read in the values for the file header
String	getFilename()	Get the file name.
long	getInitFileSize()	Get initial file size
static GempakFileReader	getInstance(RandomAccessFile raf, boolean fullCheck)	Initialize the file, read in all the metadata (ala DM_OPEN)
static long	getOffset(int fortranWord)	Get the byte offset in 0 based space from a 1 based 4 byte FORTRAN word.
GempakFileReader.DMPart	getPart(String name)	Find the part with the particular name.
int	getPartNumber(String name)	Find the part with the particular name.
protected boolean	init()	Initialize this reader.
protected boolean	init(boolean fullCheck)	Initialize the file, read in all the metadata (ala DM_OPEN)
boolean	init(RandomAccessFile raf, boolean fullCheck)	Initialize the file, read in all the metadata (ala DM_OPEN)
protected void	logError(String errMsg)	Log an error
void	printFileLabel()	Print the file label
void	printHeaders()	Print the row and column keys
void	printKeys()	Print the row and column keys
void	printParts()	Print the part information
protected void	readFileHeaderInfo()	Read the file header info (DM_RFIL)
protected void	readHeaders()	Read the headers (DM_RHDA)
protected void	readKeys()	Read in the row and column keys (DM_KEY)
protected void	readParts()	Read the parts (DM_RPRT)

Methods inherited from class java.lang.Object

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

Field Detail

rf

protected RandomAccessFile rf

The file

dmLabel

protected ucar.nc2.iosp.gempak.GempakFileReader.DMLabel dmLabel

The label common param

fileHeaderInfo

protected List<GempakFileReader.DMFileHeaderInfo> fileHeaderInfo

header info

headers

protected GempakFileReader.DMHeaders headers

headers

keys

protected GempakFileReader.DMKeys keys

key

parts

protected List<GempakFileReader.DMPart> parts

part

MTMACH

protected int MTMACH

the machine type byte order

mvmst

protected boolean mvmst

swap flag

needToSwap

protected boolean needToSwap

swap flag

fileSize

protected long fileSize

file size

Method Detail

getFile

public static RandomAccessFile getFile(String filename)
                                throws IOException

Get a RandomAccessFile for the file location

Parameters:

filename - filename to read.

Returns:

RandomAccessFile

Throws:

IOException - problem reading file

getInstance

public static GempakFileReader getInstance(RandomAccessFile raf,
                                           boolean fullCheck)
                                    throws IOException

Initialize the file, read in all the metadata (ala DM_OPEN)

Parameters:

raf - RandomAccessFile to read.

fullCheck - if true, check entire structure

Returns:

a GempakFileReader

Throws:

IOException - problem reading file

init

public boolean init(RandomAccessFile raf,
                    boolean fullCheck)
             throws IOException

Initialize the file, read in all the metadata (ala DM_OPEN)

Parameters:

raf - RandomAccessFile to read.

fullCheck - if true, check entire structure

Throws:

IOException - problem reading file

init

protected boolean init()
                throws IOException

Initialize this reader. Read all the metadata

Returns:

true if successful

Throws:

IOException - problem reading the data

init

protected boolean init(boolean fullCheck)
                throws IOException

Initialize the file, read in all the metadata (ala DM_OPEN)

Parameters:

fullCheck - if true, check entire structure

Returns:

true if successful

Throws:

IOException - problem reading file

getFilename

public String getFilename()

Get the file name.

Returns:

the name of the file

getErrorMessage

public String getErrorMessage()

getInitFileSize

public long getInitFileSize()

Get initial file size

Returns:

the file size when init was called.

getByteOrder

public int getByteOrder()

Get the byte order for this system

Returns:

byte order

getByteOrder

public int getByteOrder(int kmachn)

Get the byte order for the machine type.

Parameters:

kmachn - maching type

Returns:

byte order

readFileHeaderInfo

protected void readFileHeaderInfo()
                           throws IOException

Read the file header info (DM_RFIL)

Throws:

IOException - problem reading file

readKeys

protected void readKeys()
                 throws IOException

Read in the row and column keys (DM_KEY)

Throws:

IOException - problem reading file

readHeaders

protected void readHeaders()
                    throws IOException

Read the headers (DM_RHDA)

Throws:

IOException - problem reading file

readParts

protected void readParts()
                  throws IOException

Read the parts (DM_RPRT)

Throws:

IOException - problem reading file

getOffset

public static long getOffset(int fortranWord)

Get the byte offset in 0 based space from a 1 based 4 byte FORTRAN word.

Parameters:

fortranWord - 1 based word offset

Returns:

byte offset to that word

findKey

public GempakFileReader.Key findKey(String name)

Find a key with the given name

Parameters:

name - the name of the key

Returns:

the key or null;

findFileHeader

public GempakFileReader.DMFileHeaderInfo findFileHeader(String name)

Find the file header with this name

Parameters:

name - name of header

Returns:

headerinfo or null if not found

getFileHeader

public float[] getFileHeader(String name)
                      throws IOException

Read in the values for the file header

Parameters:

name - name of header

Returns:

values or null if not found

Throws:

IOException - problem reading file

logError

protected void logError(String errMsg)

Log an error

Parameters:

errMsg - message to log

printFileLabel

public void printFileLabel()

Print the file label

printKeys

public void printKeys()

Print the row and column keys

printHeaders

public void printHeaders()

Print the row and column keys

printParts

public void printParts()

Print the part information

getPartNumber

public int getPartNumber(String name)

Find the part with the particular name.

Parameters:

name - name of part to find

Returns:

part number.

getPart

public GempakFileReader.DMPart getPart(String name)

Find the part with the particular name.

Parameters:

name - name of part to find

Returns:

part or null if not found

getDataPointer

public int getDataPointer(int irow,
                          int icol,
                          String partName)

Get the pointer to the data. Taken from DM_RDTR

Parameters:

irow - row number

icol - column number

partName - name of the part

Returns:

word (1 based) of start of data.

DM_RINT

public int DM_RINT(int word)
            throws IOException

Read an integer

Parameters:

word - word in file (1 based) to read

Returns:

int read

Throws:

IOException - problem reading file

DM_RINT

public void DM_RINT(int word,
                    int[] iarray)
             throws IOException

Convenience method to fully read into an array of ints

Parameters:

word - word in file (1 based) to read

iarray - array to read into

Throws:

IOException - problem reading file

DM_RINT

public void DM_RINT(int word,
                    int num,
                    int[] iarray,
                    int start)
             throws IOException

Read into an array of ints.

Parameters:

word - word in file (1 based) to read

iarray - array to read into

start - starting word in the array (0 based)

num - number of words to read

Throws:

IOException - problem reading file

DM_RFLT

public float DM_RFLT(int word)
              throws IOException

Read a float

Parameters:

word - word in file (1 based) to read

Returns:

float read

Throws:

IOException - problem reading file

DM_RFLT

public void DM_RFLT(int word,
                    float[] rarray)
             throws IOException

Convenience method to fully read into an array of floats

Parameters:

word - word in file (1 based) to read

rarray - array to read into

Throws:

IOException - problem reading file

DM_RFLT

public void DM_RFLT(int word,
                    int num,
                    float[] rarray,
                    int start)
             throws IOException

Read into an array of ints.

Parameters:

word - word in file (1 based) to read

num - number of words to read

rarray - array to read into

start - starting word in the array (0 based)

Throws:

IOException - problem reading file

DM_RSTR

public String DM_RSTR(int isword)
               throws IOException

Read a 4-byte String

Parameters:

isword - offset in file (1 based FORTRAN word)

Returns:

String read

Throws:

IOException - problem reading file

DM_RSTR

public String DM_RSTR(int isword,
                      int nchar)
               throws IOException

Read a String

Parameters:

isword - offset in file (1 based FORTRAN word)

nchar - number of characters to read

Returns:

String read

Throws:

IOException - problem reading file

DM_RDTR

public GempakFileReader.RData DM_RDTR(int irow,
                                      int icol,
                                      String partName)
                               throws IOException

Read the data

Parameters:

irow - row to read

icol - column to read

partName - part name

Returns:

the header and data array or null;

Throws:

IOException - problem reading file

DM_RDTR

public GempakFileReader.RData DM_RDTR(int irow,
                                      int icol,
                                      String partName,
                                      int decimalScale)
                               throws IOException

Read the real (float) data

Parameters:

irow - row to read

icol - column to read

partName - part name

decimalScale - scaling factor (power of 10);

Returns:

the header and data array or null;

Throws:

IOException - problem reading file

DM_UNPK

public float[] DM_UNPK(GempakFileReader.DMPart part,
                       int[] ibitst)

Unpack an array of packed integers.

Parameters:

part - the part with packing info

ibitst - packed integer bit string

Returns:

unpacked ints as floats

getBits

protected static String getBits(int b)

Get a bit string for an integer

Parameters:

b - the integer

Returns:

a bit string (e.g.: 01100001|11000000|10011010|10110100|)

DM_RPKG

public float[] DM_RPKG(int isword,
                       int nword,
                       int decimalScale)
                throws IOException

subclass should implement

Parameters:

isword - starting word (1 based)

nword - number of words to read

decimalScale - decimal scale

Returns:

returns null unless subclass overrides

Throws:

IOException - problem reading data