BluetoothIOIOConnection.java

/*
 * Copyright 2011 Ytai Ben-Tsvi. All rights reserved.
 *
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list
 *       of conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ARSHAN POURSOHI OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied.
 */
package ioio.lib.android.bluetooth;

import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.os.Build;
import android.util.Log;

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;

import ioio.lib.api.IOIOConnection;
import ioio.lib.api.exception.ConnectionLostException;
import ioio.lib.impl.FixedReadBufferedInputStream;

public class BluetoothIOIOConnection implements IOIOConnection {
    private static final String TAG = "BluetoothIOIOConnection";
    private BluetoothSocket socket_ = null;
    private boolean disconnect_ = false;
    private final BluetoothDevice device_;
    private final String name_;
    private final String address_;
    private InputStream inputStream_;
    private OutputStream outputStream_;

    public BluetoothIOIOConnection(BluetoothDevice device) {
        device_ = device;
        name_ = device.getName();
        address_ = device.getAddress();
    }

    @Override
    public void waitForConnect() throws ConnectionLostException {
        synchronized (this) {
            if (disconnect_) {
                throw new ConnectionLostException();
            }
            try {
                socket_ = createSocket(device_);
            } catch (IOException e) {
                throw new ConnectionLostException(e);
            }
        }
        // keep trying to connect as long as we're not aborting
        while (true) {
            try {
                Log.v(TAG, "Attempting to connect to Bluetooth device: " + name_);
                inputStream_ = socket_.getInputStream();
                outputStream_ = socket_.getOutputStream();
                socket_.connect();
                Log.v(TAG, "Established connection to device " + name_
                        + " address: " + address_);
                break; // if we got here, we're connected
            } catch (Exception e) {
                if (disconnect_) {
                    throw new ConnectionLostException(e);
                }
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e1) {
                }
            }
        }
        // Success! Wrap the streams with a properly sized buffers.
        inputStream_ = new FixedReadBufferedInputStream(inputStream_, 64);
        outputStream_ = new BufferedOutputStream(outputStream_, 1024);
    }

    public static BluetoothSocket createSocket(final BluetoothDevice device)
            throws IOException {
        if (Build.VERSION.SDK_INT >= 10) {
            // We're trying to create an insecure socket, which is only
            // supported in API 10 and up. Otherwise, we try a secure socket
            // which is in API 7 and up.
            return device.createInsecureRfcommSocketToServiceRecord(UUID
                    .fromString("00001101-0000-1000-8000-00805F9B34FB"));
        } else {
            return device.createRfcommSocketToServiceRecord(UUID
                    .fromString("00001101-0000-1000-8000-00805F9B34FB"));
        }
    }

    @Override
    public synchronized void disconnect() {
        if (disconnect_) {
            return;
        }
        Log.v(TAG, "Client initiated disconnect");
        disconnect_ = true;
        if (socket_ != null) {
            try {
                socket_.close();
            } catch (IOException e) {
            }
        }
    }

    @Override
    public InputStream getInputStream() throws ConnectionLostException {
        return inputStream_;
    }

    @Override
    public OutputStream getOutputStream() throws ConnectionLostException {
        return outputStream_;
    }

    @Override
    public boolean canClose() {
        return true;
    }
}