visad.data.hdf5.hdf5objects
Class HDF5Datatype

java.lang.Object
  visad.data.hdf5.hdf5objects.HDF5Object
      visad.data.hdf5.hdf5objects.HDF5Datatype

All Implemented Interfaces:

Serializable

public class HDF5Datatype
extends HDF5Object

This class provides a mechanism to describe the storage format of individual data points of a data set.

A data type is a collection of data type properties, all of which can be stored on disk, and which when taken as a whole, provide complete information for data conversion to or from that data type. The interface provides functions to set and query properties of a data type.

A data point is an instance of a data type, which is an instance of a type class. We have defined a set of type classes and properties which can be extended at a later time. The atomic type classes are those which describe types which cannot be decomposed at the data type interface level; all other classes are compound.

For details of the HDF5 libraries, see the HDF5 Documentation at: http://hdf.ncsa.uiuc.edu/HDF5/doc/

See Also:

Serialized Form

Field Summary

Fields inherited from class visad.data.hdf5.hdf5objects.HDF5Object

ATTRIBUTE, DATASET, DATASPACE, DATATYPE, description, GROUP, HDF5FILE, id, LINK, name, shortName, type, UNKNOWN

Constructor Summary

HDF5Datatype()
Construct an HDF5Datatype

HDF5Datatype(int datatype_class, int size)
Creates a new HDF5Datatype

HDF5Datatype(int loc_id, String type_name)
Opens a named HDF5Datatype

Method Summary

Object	defineData(long[] count) define the data with specified data type.
protected void	finalize() finalize() is called by the garbage collector on the object when garbage collection determines that there are no more references to the object.
int	get_class() Returns the datatype class identifier
int	get_size() Returns the size of a datatype in bytes
static String	getDatatype(int data_type) Gets the string representation of the data type
int	H5Tcommit(int loc_id, String type_name) H5Tcommit commits a transient datatype to a file, turned it into a named datatype.

Methods inherited from class visad.data.hdf5.hdf5objects.HDF5Object

getDescription, getID, getName, getShortName, getType, init, setID, setShortName, setType, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

HDF5Datatype

public HDF5Datatype()

Construct an HDF5Datatype

HDF5Datatype

public HDF5Datatype(int datatype_class,
                    int size)

Creates a new HDF5Datatype

Parameters:

datatype_class - Class of datatype to create.

size - The number of bytes in the datatype to create.

HDF5Datatype

public HDF5Datatype(int loc_id,
                    String type_name)

Opens a named HDF5Datatype

Parameters:

loc_id - A file, group, or datatype identifier.

type_name - A datatype name.

Method Detail

H5Tcommit

public int H5Tcommit(int loc_id,
                     String type_name)
              throws HDF5LibraryException,
                     NullPointerException

H5Tcommit commits a transient datatype to a file, turned it into a named datatype.

Parameters:

loc_id - A file or group identifier.

type_name - A datatype name.

Returns:

a non-negative value if successful; otherwise returns a negative value.

Throws:

HDF5LibraryException

NullPointerException

get_class

public int get_class()
              throws HDF5LibraryException

Returns the datatype class identifier

Throws:

HDF5LibraryException

get_size

public int get_size()
             throws HDF5LibraryException

Returns the size of a datatype in bytes

Throws:

HDF5LibraryException

defineData

public Object defineData(long[] count)
                  throws HDF5Exception

define the data with specified data type. The maximum selected data size is limited to Integer.MAX_VALUE, which is 2,147,483,647 bytes

Parameters:

count - the number of points of data

Throws:

HDF5Exception

getDatatype

public static String getDatatype(int data_type)

Gets the string representation of the data type

Parameters:

data_type - the type of the data.

Returns:

the string of the data type

finalize

protected void finalize()
                 throws Throwable

finalize() is called by the garbage collector on the object when garbage collection determines that there are no more references to the object. It is used to dispose of system resources or to perform other cleanup as C++ destructors

Overrides:

finalize in class Object

Throws:

Throwable