visad.data.in
Class ValueUnpacker

java.lang.Object
  visad.data.in.ValueProcessor
      visad.data.in.ValueUnpacker

Direct Known Subclasses:

OffsetUnpacker, ScaleAndOffsetUnpacker, ScaleUnpacker

public abstract class ValueUnpacker
extends ValueProcessor

Provides support for unpacking data values (i.e. converting them from smaller types to bigger types).

Instances are immutable.

Author:

Steven R. Emmerson

Field Summary

Fields inherited from class visad.data.in.ValueProcessor

trivialProcessor

Constructor Summary

protected

ValueUnpacker() Constructs from nothing.

Method Summary

double	getIncrement() Returns the minimum, potential increment between numeric values.
static ValueUnpacker	valueUnpacker() Returns the trivial value unpacker.

Methods inherited from class visad.data.in.ValueProcessor

process, process, process, process

Methods inherited from class java.lang.Object

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

Constructor Detail

ValueUnpacker

protected ValueUnpacker()

Constructs from nothing.

Method Detail

valueUnpacker

public static ValueUnpacker valueUnpacker()

Returns the trivial value unpacker. The trivial value unpacker does nothing to the value during processing and its getIncrement() method returns NaN.

Returns:

The trivial value unpacker.

getIncrement

public double getIncrement()

Returns the minimum, potential increment between numeric values. Typically, this is the absolute magnitude of a "scale factor" attribute. If the increment is undefined or not applicable, then Double.NaN is returned. This method should be overridden in appropriate subclasses.

Returns:

Double.NaN.