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///////////////////////////////////////////////////////////////////////////////
// For information as to what this class does, see the Javadoc, below. //
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, //
// 2007, 2008, 2009, 2010, 2014, 2015, 2022 by Peter Spirtes, Richard //
// Scheines, Joseph Ramsey, and Clark Glymour. //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation; either version 2 of the License, or //
// (at your option) any later version. //
// //
// This program 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 General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program; if not, write to the Free Software //
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA //
///////////////////////////////////////////////////////////////////////////////
package edu.cmu.tetrad.data;
import edu.cmu.tetrad.graph.Node;
/**
* Interface implemented by classes, instantiations of which are capable of serving as variables for columns in a
* DataSet. Such a class provides needed details as to how the data in its column are to be interpreted. In particular,
* a variable has a name and specifies a value in the column that is to be interpreted as a missing datum. The variable
* also specifies how external data (in String form, say) is to be converted into raw data of the type used in the
* column in question.
*
* @author josephramsey
*/
public interface Variable extends Node {
/**
* Required serial version UID for serialization. Must be 23L.
*/
long serialVersionUID = 23L;
/**
* Returns the name of the variable.
*
* @return the missing value marker as an object--i.e. a double if continuous, an Integer if discrete, etc.
*/
Object getMissingValueMarker();
/**
* Tests whether the given value is the missing data marker.
*
* @param value The object value one wants to check as a missing value.
* @return true iff the given object is equals to getMissingValueMarker().
*/
boolean isMissingValue(Object value);
/**
* Checks to see whether the passed value can be converted into a value for this variable.
*
* @param value The object value to be checked. For instance, for a continuous variable, this would be a Double, for
* a discrete variable, and Integer, etc.
* @return true iff the object is a valid value for this variable.
*/
boolean checkValue(Object value);
}
