/*
 * Copyright (c) 2005, Regents of the University of California
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.  
 *
 * * Neither the name of the University of California, Berkeley nor
 *   the names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior 
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package blog;

import java.util.*;

public class AtomicFormula extends Formula {


    public AtomicFormula( Term sent ){

	this.sent = sent;

    }


    public Term getTerm( ) {

	return sent;

    }
    

    public Object evaluate(EvalContext context) {
	Object value = sent.evaluate(context);
	if (value == null) {
	    return null;
	}

	if (!(value instanceof Boolean)) {
	    throw new IllegalStateException
		("Sentence " + sent + " has non-Boolean value " + value);
	}
	return (value.equals(Boolean.TRUE) ? Boolean.TRUE : Boolean.FALSE);
    }

    

    public BayesNetVar getVariable() {
	return sent.getVariable();
    }

    

    public Collection getSubExprs() {
	return Collections.singletonList(sent);
    }

    

    public boolean isLiteral() {
	return true;
    }

    public List getTopLevelTerms() {
	return Collections.singletonList(sent);
    }

    public Set getSatisfiersIfExplicit(EvalContext context, 
				       LogicalVar subject,
				       GenericObject genericObj) {
	Set result = null;
	context.assign(subject, genericObj);

	// The only time we can determine the satisfiers is if this 
	// formula can be evaluated on genericObj.
	Boolean value = (Boolean) evaluate(context);
	if (value != null) {
	    result =  (value.booleanValue() == true ? 
		       Formula.ALL_OBJECTS : Collections.EMPTY_SET);
	}

	context.unassign(subject);
	return result;
    }

    public Set getNonSatisfiersIfExplicit(EvalContext context,
					  LogicalVar subject, 
					  GenericObject genericObj) {
	Set result = null;
	context.assign(subject, genericObj);

	// The only time we can determine the non-satisfiers is if
	// this formula can be evaluated on genericObj.
	Boolean value = (Boolean) evaluate(context);
	if (value != null) {
	    result =  (value.booleanValue() == false ?
		       Formula.ALL_OBJECTS : Collections.EMPTY_SET);
	}

	context.unassign(subject);
	return result;
    }

    

    public boolean equals(Object o) {
	if (o instanceof AtomicFormula) {
	    AtomicFormula other = (AtomicFormula) o;
	    return sent.equals(other.getTerm());
	}
	return false;
    }

    public int hashCode() {
	return sent.hashCode();
    }

    

    public String toString() {
	return sent.toString();
    }

    

    public boolean checkTypesAndScope(Model model, Map scope) {
	Term sentInScope = sent.getTermInScope(model, scope);
	if (sentInScope == null) {
	    return false;
	}
	sent = sentInScope;
	if (!sent.getType().isSubtypeOf(BuiltInTypes.BOOLEAN)) {
	    System.err.println("Error: Non-Boolean term treated as "
			       + "atomic formula: " + sent);
	    return false;
	}
	return true;
    }

    public ArgSpec getSubstResult(Substitution subst, 
				  Set<LogicalVar> boundVars) {
	return new AtomicFormula((Term) sent.getSubstResult(subst, boundVars));
    }

    

    private Term sent;

}

This file was generated on Tue Jun 08 17:53:36 PDT 2010 from file AtomicFormula.java
by the ilog.language.tools.Hilite Java tool written by Hassan Aït-Kaci