Package noaa.coastwatch.util

Class ExpressionFilter

java.lang.Object

noaa.coastwatch.util.ExpressionFilter

All Implemented Interfaces:

LocationFilter

public class ExpressionFilter
extends Object
implements LocationFilter

The ExpressionFilter class detects locations whose data variable values satisfy a mathematical expression. If the expression evaluates to true at the given location, the filter returns true, otherwise it returns false.

Since:

3.3.2

Author:

Peter Hollemans

See Also:

• cwmath

Constructor Summary

Constructors

Constructor	Description
ExpressionFilter(EarthDataReader reader, String expression)	Creates a new filter.

Method Summary

Modifier and Type	Method	Description
boolean	useLocation(DataLocation loc)	Determines if a data location should be used in the context of some computation.

Methods inherited from class java.lang.Object

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

Constructor Details

ExpressionFilter

public ExpressionFilter(EarthDataReader reader,
 String expression)

Creates a new filter.

Parameters:

reader - the reader to use for data variables.

expression - the mask expression. Variables names in the expression must have corresponding grids in the reader.

Method Details

useLocation

public boolean useLocation(DataLocation loc)

Description copied from interface: LocationFilter

Determines if a data location should be used in the context of some computation.

Specified by:

useLocation in interface LocationFilter

Parameters:

loc - the location to determine for use.

Returns:

true if the location should be used, or false if not.