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/* Copyright (C) 2013 TU Dortmund
 * This file is part of LearnLib, http://www.learnlib.de/.
 * 
 * LearnLib is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 3.0 as published by the Free Software Foundation.
 * 
 * LearnLib 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with LearnLib; if not, see
 * .
 */

package de.learnlib.oracles;

import java.util.Collection;

import de.learnlib.api.MembershipOracle;
import de.learnlib.api.Query;

/**
 *
 * @author Maik Merten 
 */
public class SafeOracle implements MembershipOracle {
    
    private MembershipOracle nextOracle;
    
    public SafeOracle(MembershipOracle nextOracle) {
        this.nextOracle = nextOracle;
    }
    

    @Override
    public void processQueries(Collection> queries) {
        // let the next oracle in chain process the queries
        nextOracle.processQueries(queries);
        
        // now, let's see if everything is okay
        for(Query query : queries)
            checkQuery(query);
    }
    
    protected void checkQuery(Query query) {
    	
    	// somebody punched holes into our query batch
        if(query == null)
            throw new RuntimeException("Query batch is incomplete, contains null query.");
        
        // is there actual output?
        // FIXME: Removed this because of Query interface change, but since we do not require outputs
        //        to be alphabet symbols, I believe prohibiting null outputs is not a valid requirement?
        //        -mi
        //if(query.getOutput() == null)
        //    throw new RuntimeException("Query batch is not answered, contains null answer for Query (" + query.getPrefix() + ", " + query.getSuffix() + ")");
    }
    
}