ucar.nc2.iosp.noaa

Class Ghcnm

java.lang.Object

ucar.nc2.iosp.AbstractIOServiceProvider

ucar.nc2.iosp.noaa.Ghcnm

All Implemented Interfaces:

IOServiceProvider

public class Ghcnm
extends AbstractIOServiceProvider

Nomads GLOBAL HISTORICAL CLIMATOLOGY NETWORK MONTHLY (GHCNM) v3 Beta. Ascii file. Write index into .ncsx using protobug (experimental) IOSP can then recognize the ncsx file, so it can be passed into NetdfFile.open() instead of the ascii file. Otherwise you have to explicitly specify the iosp, eg:

The index has list of stations and offsets into station file and data file. since the data file has one station's data grouped together, this efficiently answers "get all data for station". One could sort datafile by time, and add time index, to answer "get all data for time range".

 Protobuf generation:
 cd c:/dev/tds4.2/thredds/cdm/src/main/java
 protoc --proto_path=. --java_out=. ucar/nc2/iosp/noaa/GhcnmIndex.proto
 

LOOK probable file leaks

Since:

Dec 8, 2010

Field Summary

Fields inherited from class ucar.nc2.iosp.AbstractIOServiceProvider

location, raf, rafOrder

Constructor Summary

Constructors

Constructor and Description
Ghcnm()

Method Summary

Modifier and Type	Method and Description
void	close() Close the file.
java.lang.String	getFileTypeDescription() Get a human-readable description for this file type.
java.lang.String	getFileTypeId() Get a unique stnId for this file type.
StructureDataIterator	getStructureIterator(Structure s, int bufferSize) Get the structure iterator
boolean	isValidFile(RandomAccessFile raf) Check if this is a valid file for this IOServiceProvider.
void	open(RandomAccessFile raf, NetcdfFile ncfile, CancelTask cancelTask) Open existing file, and populate ncfile with it.
Array	readData(Variable v2, Section section) Returns an ArraySequence, no subsetting is allowed.

Methods inherited from class ucar.nc2.iosp.AbstractIOServiceProvider

build, buildFinish, getDetailInfo, getFileTypeVersion, getLastModified, isBuilder, reacquire, readSection, readToByteChannel, readToOutputStream, release, sendIospMessage, setNetcdfFile, streamToByteChannel, syncExtend, toStringDebug

Methods inherited from class java.lang.Object

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

Constructor Detail

Ghcnm

public Ghcnm()

Method Detail

isValidFile

public boolean isValidFile(RandomAccessFile raf)
                    throws java.io.IOException

Description copied from interface: IOServiceProvider

Check if this is a valid file for this IOServiceProvider. You must make this method thread safe, ie dont keep any state.

Parameters:

raf - RandomAccessFile

Returns:

true if valid.

Throws:

java.io.IOException - if read error

close

public void close()
           throws java.io.IOException

Description copied from interface: IOServiceProvider

Close the file. It is the IOServiceProvider's job to close the file (even though it didnt open it), and to free any other resources it has used.

Specified by:

close in interface IOServiceProvider

Overrides:

close in class AbstractIOServiceProvider

Throws:

java.io.IOException - if read error

open

public void open(RandomAccessFile raf,
                 NetcdfFile ncfile,
                 CancelTask cancelTask)
          throws java.io.IOException

Description copied from interface: IOServiceProvider

Open existing file, and populate ncfile with it. This method is only called by the NetcdfFile constructor on itself. The provided NetcdfFile object will be empty except for the location String and the IOServiceProvider associated with this NetcdfFile object.

Specified by:

open in interface IOServiceProvider

Overrides:

open in class AbstractIOServiceProvider

Parameters:

raf - the file to work on, it has already passed the isValidFile() test.

ncfile - add objects to this empty NetcdfFile

cancelTask - used to monitor user cancellation; may be null.

Throws:

java.io.IOException - if read error

getFileTypeId

public java.lang.String getFileTypeId()

Get a unique stnId for this file type.

Returns:

registered stnId of the file type

See Also:

"https://www.unidata.ucar.edu/software/netcdf-java/formats/FileTypes.html"

getFileTypeDescription

public java.lang.String getFileTypeDescription()

Get a human-readable description for this file type.

Returns:

description of the file type

See Also:

"https://www.unidata.ucar.edu/software/netcdf-java/formats/FileTypes.html"

readData

public Array readData(Variable v2,
                      Section section)
               throws java.io.IOException

Returns an ArraySequence, no subsetting is allowed.

Parameters:

v2 - a top-level Variable

section - the section of data to read. There must be a Range for each Dimension in the variable, in order. Note: no nulls allowed. IOSP may not modify.

Returns:

ArraySequence

Throws:

java.io.IOException - if read error

See Also:

Range

getStructureIterator

public StructureDataIterator getStructureIterator(Structure s,
                                                  int bufferSize)
                                           throws java.io.IOException

Get the structure iterator

Specified by:

getStructureIterator in interface IOServiceProvider

Overrides:

getStructureIterator in class AbstractIOServiceProvider

Parameters:

s - the Structure

bufferSize - the buffersize

Returns:

the data iterator

Throws:

java.io.IOException - if problem reading data