/*******************************************************************************
* Copyright (C) 2008-2012 Dominik Jain.
*
* This file is part of ProbCog.
*
* ProbCog 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 3 of the License, or
* (at your option) any later version.
*
* ProbCog 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 ProbCog. If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
package probcog.logic;
import probcog.srl.GenericDatabase;
import probcog.srl.Signature;
import probcog.srl.directed.RelationalBeliefNetwork;
/**
* Represents a possible world, where the values are given in a database.
* @author Dominik Jain
*/
public class PossibleWorldFromDatabase implements IPossibleWorld {
GenericDatabase<?,?> db;
RelationalBeliefNetwork rbn;
boolean closedWorld;
public PossibleWorldFromDatabase(RelationalBeliefNetwork rbn, GenericDatabase<?,?> db, boolean closedWorld) {
this.db = db;
this.rbn = rbn;
this.closedWorld = closedWorld;
}
public boolean isTrue(GroundAtom ga) {
try {
Signature sig = rbn.getSignature(ga.predicate);
if(sig.isBoolean()) {
String value = db.getSingleVariableValue(ga.toString(), closedWorld);
if(value == null)
throw new RuntimeException("Value of " + ga + " not in the database that is used as a possible world; perhaps it must always be given because it is used in a precondition/decision node.");
boolean tv = value.equalsIgnoreCase("True");
//System.out.println("value of atom " + ga + " corresponding to boolean function is " + (tv ? "true" : "false"));
return tv;
}
else {
String varName = rbn.gndAtom2VarName(ga);
String value = db.getSingleVariableValue(varName, closedWorld);
if(value == null)
throw new RuntimeException("Value of " + varName + " not in the database that is used as a possible world; perhaps it must always be given because it is used in a precondition/decision node.");
boolean tv = value.equals(ga.args[ga.args.length-1]);
//System.out.println("value of atom " + ga + " corresponding to non-boolean function is " + (tv ? "true" : "false"));
return tv;
}
}
catch(Exception e) {
throw new RuntimeException(e);
}
}
}