BitmapJFrame.java

/*
    BeepBeep, an event stream processor
    Copyright (C) 2008-2017 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 plots;

import java.util.Queue;

import java.awt.FlowLayout;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

import ca.uqac.lif.cep.Processor;
import ca.uqac.lif.cep.ProcessorException;
import ca.uqac.lif.cep.tmf.Sink;

/**
 * Receives a byte array as an input, and shows it in a Swing
 * window as a picture. This processor is a sink: it receives
 * input events, but emits no output events. In the examples of this
 * package, it is represented graphically as:
 * <p>
 * <img src="./doc-files/plots/BitmapJFrame.png" alt="Processor">
 * 
 * @author Sylvain Hallé
 */
public class BitmapJFrame extends Sink
{
    protected transient JFrame m_frame;

    protected transient JLabel m_label;

    public BitmapJFrame()
    {
        super(1);
        m_frame = new JFrame("My plot");
        JPanel panel = new JPanel(new FlowLayout(FlowLayout.CENTER));
        m_frame.add(panel);
        m_frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        m_label = new JLabel();
        panel.add(m_label);
    }

    @Override
    public void start()
    {
        m_frame.setSize(800, 600);
        m_frame.setVisible(true);
    }

    @Override
    protected boolean compute(Object[] inputs, Queue<Object[]> outputs) throws ProcessorException 
    {
        byte[] bytes = (byte[]) inputs[0];
        m_label.setIcon(new ImageIcon(bytes));
        return false;
    }
    
    /**
     * Gets the frame associated to the object
     * @return The frame
     */
    public JFrame getFrame()
    {
      return m_frame;
    }

    @Override
    public Processor duplicate(boolean with_state) 
    {
        // Don't care
        return null;
    }
}