visad.data.netcdf
Class VariableFilter

java.lang.Object
  ucar.netcdf.NetcdfWrapper
      visad.data.netcdf.VariableFilter

All Implemented Interfaces:

Netcdf

final class VariableFilter

extends NetcdfWrapper

Wrapper class for restricting the Netcdf.iterator() and Netcdf.size() methods to only those variables that are also in a client-specified list. All other methods of the Netcdf API are those of NetcdfWrapper. Thus, it is possible to bypass the variable-filtering provided by this class by directly invoking the single-variable methods (e.g. Netcdf.get(String), Netcdf.contains(Object)).

Constructor Summary

protected

VariableFilter(Netcdf netcdf, Set names) Constructs from a netCDF dataset and a set of variable names.

Method Summary

VariableIterator	iterator() Returns an iterator over the variables.
int	size() Returns the number of variables.

Methods inherited from class ucar.netcdf.NetcdfWrapper

contains, contains, get, getAttribute, getAttributes, getDimensions, getNetcdf

Methods inherited from class java.lang.Object

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

Constructor Detail

VariableFilter

protected VariableFilter(Netcdf netcdf,
                         Set names)
                  throws NullPointerException

Constructs from a netCDF dataset and a set of variable names. The dataset will appear to only contain the set of variables that is the intersection of the variables in the dataset and the named variables.

Parameters:

netcdf - The netCDF dataset to be wrapped.

names - A set of variable names.

Method Detail

size

public int size()

Returns the number of variables. This is the number of variables that will be returned by the iterator obtained from the iterator() method.

Specified by:

size in interface Netcdf

Overrides:

size in class NetcdfWrapper

Returns:

The number of variables

iterator

public VariableIterator iterator()

Returns an iterator over the variables. The iterator will only return those variables in the underlying netCDF dataset whose names were in the set of names used during construction. The number of such variables equals the return value of size().

Specified by:

iterator in interface Netcdf

Overrides:

iterator in class NetcdfWrapper

Returns:

An iterator over the variables.