/* *    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., 675 Mass Ave, Cambridge, MA 02139, USA. *//* *    AttributeValueLiteral.java *    Copyright (C) 2003 Peter A. Flach, Nicolas Lachiche * *    Thanks to Amelie Deltour for porting the original C code to Java *    and integrating it into Weka. */package weka.associations.tertius;import weka.core.Instance;import weka.associations.Tertius;/** * @author Peter A. Flach * @author Nicolas Lachiche * @version $Revision: 1.5 $ */public class AttributeValueLiteral extends Literal {  /** for serialization */  private static final long serialVersionUID = 4077436297281456239L;  private String m_value;    private int m_index;    public AttributeValueLiteral(Predicate predicate, String value, 			       int index, int sign, int missing) {    super(predicate, sign, missing);    m_value = value;    m_index = index;  }  public boolean satisfies(Instance instance) {    if (m_index == -1) {      if (positive()) {	return instance.isMissing(getPredicate().getIndex());      } else {	return !instance.isMissing(getPredicate().getIndex());      }    } else if (instance.isMissing(getPredicate().getIndex())) {      if (positive()) {	return false;      } else {	return m_missing != Tertius.EXPLICIT;      }    } else {      if (positive()) {	return (instance.value(getPredicate().getIndex()) == m_index);      } else {	return (instance.value(getPredicate().getIndex()) != m_index);      }    }  }  public boolean negationSatisfies(Instance instance) {    if (m_index == -1) {      if (positive()) {	return !instance.isMissing(getPredicate().getIndex());      } else {	return instance.isMissing(getPredicate().getIndex());      }    } else if (instance.isMissing(getPredicate().getIndex())) {      if (positive()) {	return m_missing != Tertius.EXPLICIT;      } else {	return false;      }    } else {      if (positive()) {	return (instance.value(getPredicate().getIndex()) != m_index);      } else {	return (instance.value(getPredicate().getIndex()) == m_index);      }    }  }  public String toString() {    StringBuffer text = new StringBuffer();    if (negative()) {      text.append("not ");    }    text.append(getPredicate().toString() + " = " + m_value);    return text.toString();  }}