content: /*
   * Copyright (C) 2011 The Android Open Source Project
   *
   * 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 android.filterfw.core;
  
  import java.util.Random;
  import java.util.Vector;
  
  import android.filterfw.core.Filter;
  import android.filterfw.core.Scheduler;
  
  /**
   * @hide
   */
  public class RandomScheduler extends Scheduler {
  
      private Random mRand = new Random();
  
      public RandomScheduler(FilterGraph graph) {
          super(graph);
      }
  
      @Override
      public void reset() {
      }
  
      @Override
      public Filter scheduleNextNode() {
          Vector<Filter> candidates = new Vector<Filter>();
          for (Filter filter : getGraph().getFilters()) {
              if (filter.canProcess())
                  candidates.add(filter);
          }
          if (candidates.size() > 0) {
            int r = mRand.nextInt(candidates.size());
            return candidates.elementAt(r);
          }
          return null;
      }
  }
  