package com.felhr.usbserial;

import java.io.InputStream;
import java.util.concurrent.ArrayBlockingQueue;

public class SerialInputStream extends InputStream implements UsbSerialInterface.UsbReadCallback 
{
	protected final UsbSerialInterface device;
	protected ArrayBlockingQueue data = new ArrayBlockingQueue<Integer>(256);
	protected volatile boolean is_open;

	public SerialInputStream(UsbSerialInterface device) 
	{
		this.device = device;
		is_open = true;
		device.read(this);
	}

	@Override 
	public int read() 
	{
		while (is_open) 
		{
			try 
			{
				return (Integer)data.take();
			} catch (InterruptedException e) 
			{
				// ignore, will be retried by while loop
			}
		}
		return -1;
	}

	public void close() 
	{
		is_open = false;
		try 
		{
			data.put(-1);
		} catch (InterruptedException e) 
		{
			e.printStackTrace();
		}
	}

	public void onReceivedData(byte[] new_data) 
	{
		for (byte b : new_data) 
		{
			try 
			{
				data.put(((int)b) & 0xff);
			} catch (InterruptedException e) 
			{
				// ignore, possibly losing bytes when buffer is full
			}
		}
	}
}