/*
VisAD system for interactive analysis and visualization of numerical
data. Copyright (C) 1996 - 2017 Bill Hibbard, Curtis Rueden, Tom
Rink, Dave Glowacki, Steve Emmerson, Tom Whittaker, Don Murray, and
Tommy Jasmin.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA
$Id: Condition.java,v 1.8 2009-03-02 23:35:48 curtis Exp $
*/
package visad.data.in;
import visad.*;
/**
* Provides support for applying arbitrary conditions to VisAD data objects.
* This class supports data filters like {@link Selector}.
*
* <P>Instances are immutable.</P>
*
* @author Steven R. Emmerson
*/
public abstract class Condition
{
/**
* The trivial condition. The {@link #isSatisfied} method of this condition
* always returns <code>true</code>.
*/
public static Condition TRIVIAL_CONDITION =
new Condition()
{
public boolean isSatisfied(DataImpl data)
{
return true;
}
};
/**
* Indicates if a VisAD data object satisfies this condition.
*
* @param data A VisAD data object.
* @return <code>true</code> if and only if the VisAD data
* object satisfies this instance's condition.
*/
public abstract boolean isSatisfied(DataImpl data);
}