/************************************************************************
* Strathclyde Planning Group,
* Department of Computer and Information Sciences,
* University of Strathclyde, Glasgow, UK
* http://planning.cis.strath.ac.uk/
*
* Copyright 2007, Keith Halsey
* Copyright 2008, Andrew Coles and Amanda Smith
*
* (Questions/bug reports now to be sent to Andrew Coles)
*
* This file is part of JavaFF.
*
* JavaFF 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.
*
* JavaFF 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 JavaFF. If not, see <http://www.gnu.org/licenses/>.
*
************************************************************************/
package javaff.data.strips;
import javaff.data.GroundCondition;
import javaff.data.GroundEffect;
import javaff.planning.State;
import javaff.planning.STRIPSState;
import java.util.Set;
import java.util.HashSet;
import java.util.Map;
public class Proposition extends javaff.data.Literal implements GroundCondition, GroundEffect
{
public Proposition(PredicateSymbol p)
{
name = p;
}
public boolean isTrue(State s) // returns whether this conditions is true is State S
{
STRIPSState ss = (STRIPSState) s;
return ss.isTrue(this);
}
public void apply(State s) // carry out the effects of this on State s
{
STRIPSState ss = (STRIPSState) s;
ss.addProposition(this);
}
public void applyAdds(State s)
{
apply(s);
}
public void applyDels(State s)
{
}
public boolean isStatic()
{
return name.isStatic();
}
public Set getDeletePropositions()
{
return new HashSet();
}
public Set getAddPropositions()
{
Set rSet = new HashSet();
rSet.add(this);
return rSet;
}
public GroundCondition staticifyCondition(Map fValues)
{
if (isStatic()) return TrueCondition.getInstance();
else return this;
}
public GroundEffect staticifyEffect(Map fValues)
{
return this;
}
public Set getConditionalPropositions()
{
Set rSet = new HashSet();
rSet.add(this);
return rSet;
}
public Set getOperators()
{
return new HashSet();
}
public Set getComparators()
{
return new HashSet();
}
public int hashCode()
{
int hash = 6;
hash = 31 * hash ^ name.hashCode();
hash = 31 * hash ^ parameters.hashCode();
return hash;
}
}