MyMax.java

/*
    BeepBeep, an event stream processor
    Copyright (C) 2008-2018 Sylvain Hallé

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package customprocessors;

import java.util.Queue;

import ca.uqac.lif.cep.*;

public class MyMax extends SynchronousProcessor
{
  Number last = null;

  public MyMax() 
  {
    super(1, 1);
  }

  @Override
  public boolean compute(Object[] inputs, Queue<Object[]> outputs) 
  {
    Number current = (Number) inputs[0];
    Number output;
    if (last != null) 
    {
      output = Math.max(last.floatValue(), current.floatValue());
      last = current;
      outputs.add(new Object[]{output});
    }
    else 
    {
      last = current;
    }
    return true;
  }

  @Override
  public Processor duplicate(boolean with_state)
  {
    MyMax mm = new MyMax();
    if (with_state)
    {
      mm.last = this.last;
    }
    return mm;
  }
}