RandomStreamManager.java

/*
 * Class:        RandomStreamManager
 * Description:  Manages a list of random streams
 * Environment:  Java
 * Software:     SSJ 
 * Copyright (C) 2001  Pierre L'Ecuyer and Universite de Montreal
 * Organization: DIRO, Universite de Montreal
 * @author       
 * @since
 *
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package umontreal.ssj.rng;
 
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;
import umontreal.ssj.rng.RandomStream;

public class RandomStreamManager {
   private List streams = new ArrayList();

   public RandomStream add(RandomStream stream) {
      if (stream == null)
         throw new NullPointerException();
      if (streams.contains(stream))
         return stream;
      streams.add(stream);
      return stream;
   }

   public boolean remove(RandomStream stream) {
      return streams.remove(stream);
   }

   public void clear() {
      streams.clear();
   }

   public List getStreams() {
      return Collections.unmodifiableList(streams);
   }

   public void resetStartStream() {
      for (int s = 0; s < streams.size(); s++)
         ((RandomStream) streams.get(s)).resetStartStream();
   }

   public void resetStartSubstream() {
      for (int s = 0; s < streams.size(); s++)
         ((RandomStream) streams.get(s)).resetStartSubstream();
   }

   public void resetNextSubstream() {
      for (int s = 0; s < streams.size(); s++)
         ((RandomStream) streams.get(s)).resetNextSubstream();
   }
 
   public String toString() {
      StringBuffer sb = new StringBuffer(getClass().getName());
      sb.append('[');
      sb.append("number of stored streams: ").append(streams.size());
      sb.append(']');
      return sb.toString();
   }
}