PrologAllSolutions.java

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/* 
 * Copyright (c) 2010, Lorenz Moesenlechner
 * 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 Willow Garage, Inc. 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
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package edu.tum.cs.ias.knowrob.json_prolog;

import java.util.Hashtable;

import jpl.Term;

public final class PrologAllSolutions implements PrologSolutions {

  private int currentIndex = 0;
  Hashtable<String, jpl.Term>[] solutions;
  
  @SuppressWarnings("unchecked")
  PrologAllSolutions(jpl.Query query) {
    solutions = (Hashtable<String, jpl.Term>[])query.allSolutions();
  }
  
  @Override
  public void close() {
    // This method doesn't need to do anything here. We already closed the query. 
  }  
  
  @Override
  public void reset() {
    currentIndex = 0;
  }

  @Override
  public Hashtable<String, Term> nextSolution() {
    Hashtable<String, jpl.Term> result = solutions[currentIndex];
    currentIndex++;
    return result;
  }

  @Override
  public boolean hasMoreSolutions() {
    return currentIndex < solutions.length;
  }

}