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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.util.TetradSerializable;
import java.io.IOException;
import java.io.ObjectInputStream;
/**
* Implements a knowledge edge X-->Y as a simple ordered pair of strings.
*
* @author josephramsey
*/
public final class KnowledgeEdge implements TetradSerializable {
private static final long serialVersionUID = 23L;
/**
* @serial
*/
private final String from;
/**
* @serial
*/
private final String to;
/**
* Constructs a knowledge edge for from-->to.
*/
public KnowledgeEdge(String from, String to) {
if (from == null || to == null) {
throw new NullPointerException();
}
this.from = from;
this.to = to;
}
/**
* Generates a simple exemplar of this class to test serialization.
*/
public static KnowledgeEdge serializableInstance() {
return new KnowledgeEdge("X", "Y");
}
/**
* @return the tail node of the edge.
*/
public String getFrom() {
return this.from;
}
/**
* @return the head node of the edge.
*/
public String getTo() {
return this.to;
}
/**
* Reteurns true if (from1, to1) == (from2, to2).
*/
public boolean equals(Object object) {
if (object == null) {
return false;
}
if (!(object instanceof KnowledgeEdge)) {
return false;
}
KnowledgeEdge pair = (KnowledgeEdge) object;
return this.from.equals(pair.from) && this.to.equals(pair.to);
}
/**
* @return a good hashcode.
*/
public int hashCode() {
int hashCode = 31 + this.from.hashCode();
return 37 * hashCode + this.to.hashCode();
}
public String toString() {
return this.from + "-->" + this.to;
}
/**
* 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();
}
}