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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.sem;
import edu.cmu.tetrad.graph.Node;
import edu.cmu.tetrad.util.TetradSerializable;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.Arrays;
import java.util.List;
/**
* Represents propositions over the variables of a particular BayesIm describing and event of a fairly general
* sort--namely, conjunctions of propositions that particular variables take on values from a particular disjunctive
* list of categories. For example, X1 = 1 or 2 and X2 = 3 and X3 = 1 or 3 and X4 = 2 or 3 or 5. The proposition is
* created by allowing or disallowing particular categories. Notice that "knowing nothing" about a variable is the same
* as saying that all categories for that variable are allowed, so the proposition by default allows all categories for
* all variables--i.e. it is a tautology.
*
* @author josephramsey
*/
public final class SemProposition implements TetradSerializable {
private static final long serialVersionUID = 23L;
/**
* @serial Cannot be null.
*/
private final SemIm semIm;
/**
* @serial Cannot be null.
*/
private final double[] values;
/**
* Creates a new Proposition which allows all values.
*/
public SemProposition(SemIm semIm) {
if (semIm == null) {
throw new NullPointerException();
}
this.semIm = semIm;
this.values = new double[semIm.getVariableNodes().size()];
Arrays.fill(this.values, Double.NaN);
}
public SemProposition(SemProposition proposition) {
this.semIm = proposition.semIm;
this.values = Arrays.copyOf(proposition.values, proposition.values.length);
}
public static SemProposition tautology(SemIm semIm) {
return new SemProposition(semIm);
}
/**
* Generates a simple exemplar of this class to test serialization.
*/
public static SemProposition serializableInstance() {
return new SemProposition(SemIm.serializableInstance());
}
/**
* @return the Bayes IM that this is a proposition for.
*/
public SemIm getSemIm() {
return this.semIm;
}
/**
* @return the number of variables for the proposition.
*/
public int getNumVariables() {
return this.values.length;
}
/**
* @return the index of the variable with the given name, or -1 if such a variable does not exist.
*/
public int getNodeIndex() {
return -1;
}
public boolean equals(Object o) {
if (o == null) {
return false;
}
if (!(o instanceof SemProposition)) {
throw new IllegalArgumentException();
}
SemProposition proposition = (SemProposition) o;
if (!(this.semIm == proposition.semIm)) {
return false;
}
for (int i = 0; i < this.values.length; i++) {
if (!(Double.isNaN(this.values[i]) && Double.isNaN(proposition.values[i]))) {
if (this.values[i] != proposition.values[i]) {
return false;
}
}
}
return true;
}
public int hashCode() {
int hashCode = 37;
hashCode = 19 * hashCode + this.semIm.hashCode();
hashCode = 19 * hashCode + Arrays.hashCode(this.values);
return hashCode;
}
public String toString() {
List nodes = this.semIm.getVariableNodes();
StringBuilder buf = new StringBuilder();
buf.append("\nProposition: ");
for (int i = 0; i < nodes.size(); i++) {
Node node = nodes.get(i);
buf.append("\n").append(node).append(" = ").append(this.values[i]);
}
return buf.toString();
}
/**
* Adds semantic checks to the default deserialization method. This method must have the standard signature for a
* readObject method, and the body of the method must begin with "s.defaultReadObject();". Other than that, any
* semantic checks can be specified and do not need to stay the same from version to version. A readObject method of
* this form may be added to any class, even if Tetrad sessions were previously saved out using a version of the
* class that didn't include it. (That's what the "s.defaultReadObject();" is for. See J. Bloch, Effective Java, for
* help.
*/
private void readObject(ObjectInputStream s)
throws IOException, ClassNotFoundException {
s.defaultReadObject();
}
public double getValue(int i) {
return this.values[i];
}
public void setValue(int i, double value) {
this.values[i] = value;
}
public double getValue(Node node) {
List nodes = this.semIm.getVariableNodes();
return this.values[nodes.indexOf(node)];
}
public void setValue(Node node, double value) {
List nodes = this.semIm.getVariableNodes();
this.values[nodes.indexOf(node)] = value;
}
}
