bluetoothconnection.java

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// Copyright 2004 Nokia Corporation.
//
// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,
// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS
// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE
// OR TRADE PRACTICE, RELATING TO THE SOURCE CODE OR ANY WARRANTY OTHERWISE
// ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE AND WITH NO
// OBLIGATION OF NOKIA TO PROVIDE THE LICENSEE WITH ANY MAINTENANCE OR
// SUPPORT. FURTHERMORE, NOKIA MAKES NO WARRANTY THAT EXERCISE OF THE
// RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT
// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED
// BY THIRD PARTIES
//
// Furthermore, information provided in this source code is preliminary,
// and may be changed substantially prior to final release. Nokia Corporation
// retains the right to make changes to this source code at
// any time, without notice. This source code is provided for informational
// purposes only.
//
// Nokia and Nokia Connecting People are registered trademarks of Nokia
// Corporation.
// Java and all Java-based marks are trademarks or registered trademarks of
// Sun Microsystems, Inc.
// Other product and company names mentioned herein may be trademarks or
// trade names of their respective owners.
//
// A non-exclusive, non-transferable, worldwide, limited license is hereby
// granted to the Licensee to download, print, reproduce and modify the
// source code. The licensee has the right to market, sell, distribute and
// make available the source code in original or modified form only when
// incorporated into the programs developed by the Licensee. No other
// license, express or implied, by estoppel or otherwise, to any other
// intellectual property rights is granted herein.



//==============================================================================
// Package Statements



//==============================================================================
// Import Statements

//#ifndef useBT
//public class BluetoothConnection
//{
//}

//#else

import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.io.*;
import java.util.*;
import javax.bluetooth.*;


//==============================================================================
// CLASS (OR INTERFACE) DECLARATIONS

/** The <code>BluetoothConnection</code> encapsulates the Stream Input and
 * Output connections.
 * A BluetoothConnection is returned by
 * {@link BluetoothDiscovery#searchService BluetoothDiscovery.searchService} or
 * {@link BluetoothDiscovery#waitOnConnection BluetoothDiscovery.waitOnConnection}.
 */

public class BluetoothConnection
{

    //==============================================================================
    // Final variables (Class constants)

    //==============================================================================
    // Class (static) variables

    //==============================================================================
    // Instance variables
    private StreamConnection streamConnection;
    /** This is the InputStream associated with the Bluetooth Connection.
     */
    private InputStream inputStream;
    /** This is the OutputStream associated with the Bluetooth Connection.
     */
    private OutputStream outputStream;
    /** This is the name of the local device associated with the Bluetooth Connection.
     */
    private String localName;     // Name of local device for this connection
    /** This is the name of the remote device associated with the Bluetooth Connection.
     */
    private String remoteName;    // Name of remote device for this connection
    private String url; // urlStrings used for connecting, for server this is empty.



    //==============================================================================
    // Constructors and miscellaneous (finalize method, initialization block,...)

    /** Creates an <code>BluetoothConnection</code> object.
     * An Input- and an OutputStream is opened.
     * This constructor is used for mobile terminated connections (local device = server).
     * The connection object already exists and is passed as parameter.
     * @param con The StreamConnection object.
     * @param ln Name of local device for the connection. This is typically a friendly
     * name for the device.
     * @param rn Name of remote device for the connection. This is typically the service name or eg. the
     * friendly name of the remote device.
     * @param notif The notifier that has been used to create the StreamConenction object con. Is only used in Close(): the notifier is closed as well.
     */
    public BluetoothConnection(StreamConnection con, String ln, String rn)
        throws IOException
    {
        // Store name
        localName = ln;
        remoteName = rn;

        // Init url to zero
        url = "";

        // Store stream connection
        streamConnection = con;

        // Open Input and Output Streams
        openStreams();
    }

    /** Creates an <code>BluetoothConnection</code> object.
     * An Input- and an OutputStream is opened.
     * This constructor is used for mobile originated connections (local device = client).
     * A url is given as parameter and the constructor creates a connection.
     * @param urlStrings If local device = client then this is the url it connected to.
     * If local device = server then it is empty.
     * @param ln Name of local device for the connection. This is typically a friendly
     * name for the device.
     * @param rn Name of remote device for the connection. This is typically the service name or eg. the
     * friendly name of the remote device.
     * @throws IOException Signals that an I/O exception of some sort has occurred. This class is the general class of exceptions produced by failed or interrupted I/O operations.
     */
    public BluetoothConnection(String urlStrings, String ln, String rn)
        throws IOException
    {
        // Store name
        localName = ln;
        remoteName = rn;

        // Store the url
        url = urlStrings;

        // Connect to url
        connect();
    }   /*  End of the constructor method   */

    /**
     * Connects to url. Can only be used if url String is available, ie.
     * 'BluetoothConnection' was created with constructor
     * 'BluetoothConnection( String urlStrings, String ln, String rn )'.
     * This method is public. So, in case the link was disconnected (or link
     * was lost) this method can be used also to reconnect. Normally this method
     * is already called from the constructor.
     * @throws IOException Signals that an I/O exception of some sort has
     * occurred. This class is the general class of exceptions produced by
     * failed or interrupted I/O operations.
     */
    private void connect()
        throws IOException
    {
        // Create stream connection
        streamConnection = (StreamConnection) Connector.open( url );

        // Open Input and Output Streams
        openStreams();
    }

    /**
     * Opens the InputStream and the OutputStream for the
     * StreamConnection object (streamConnection)
     */
    private void openStreams()
        throws IOException
    {
        inputStream = streamConnection.openInputStream();
        outputStream = streamConnection.openOutputStream();
    }

    /**
     * Closes all connections.
     */
    synchronized public void close()
    {
        try
        {
            outputStream.close();
        }
        catch(IOException e)
        {
            // There is not much we can do; we tried to close it.
        }

        try
        {
            inputStream.close();
        }
        catch(IOException e)
        {
            // There is not much we can do; we tried to close it.
        }

        try
        {
            if(streamConnection != null)
            {
                streamConnection.close();
                streamConnection = null;
            }
        }
        catch( IOException e )
        {
            // There is not much we can do; we tried to close it.
        }
    }

    public InputStream getInputStream()
    {
        return inputStream;
    }

    public OutputStream getOutputStream()
    {
        return outputStream;
    }

    public String getLocalName()
    {
        return localName;
    }

    public String getRemoteName()
    {
        return remoteName;
    }

    /** Sets a remote name for this Connection.
     * Is used by {@link BluetoothDiscovery BluetoothDiscovery}.
     * @param rn The remote name to be used for this connection.
     */
    protected void setRemoteName( String rn )
    {
        remoteName = rn;
    }

    /** Sends a string to remote device.
     * It first sends the length (int), followed by the characters.
     * String is not null-terminated.
     * String is sent directly to remote device (flushed).
     * Strings have to be limited to 255 chars max.
     * Is used by {@link BluetoothDiscovery BluetoothDiscovery}.
     * @param s String to be send to remote device.
     */
    public void writeString(String s)
        throws IOException
    {
        // Convert to byte array
        byte[] bytes = s.getBytes();
        // Length
        outputStream.write(bytes.length); // Writes only the low-order byte of length
        // String
        outputStream.write(bytes);
        // Flush
        outputStream.flush();
    }

    /** Reads a string from remote device.
     * It first reads the length (int), followed by the characters.
     * String is not null-terminated.
     * Strings have to be limited to 255 chars max.
     * Is used by {@link BluetoothDiscovery BluetoothDiscovery}.
     * @return String that is read from the remote device.
     */
    public String readString()
        throws IOException
    {
        // Length
        int length = inputStream.read();
        byte[] bytes = new byte[length];
        read(bytes, length);

        return new String(bytes);
    }

    /**
     * Writes an integer
     */
    public void writeInt( int v )
    throws IOException
    {
        outputStream.write( (v & 0xFF) );
        outputStream.write( ((v>>8) & 0xFF) );
        outputStream.write( ((v>>16) & 0xFF) );
        outputStream.write( ((v>>24) & 0xFF) );
        // Flush
        outputStream.flush();
    }

    /**
     * Reads an integer
     */
    public int readInt()
    throws IOException
    {
        int res;

        res = inputStream.read();
        res += inputStream.read()<<8;
        res += inputStream.read()<<16;
        res += inputStream.read()<<24;
        return res;
    }

    /** Returns true if connection has been closed.
     * @return true if connection is closed, false if connection is open.
     */
    public boolean isClosed()
    {
        if( streamConnection == null )
        {
            // is closed
            return true;
        }
        else
        {
            // is still open
            return false;
        }
    }

    /** Reads bytes into the array. Blocks until 'len' bytes are read.
     * @param arr Array that should get the data.
     * @param len Number of bytes to read. Method doesn't return until all
     * bytes are read.
     */
    public void read( byte[] arr, int len )
    throws IOException
    {
        int offs, count;

        offs = 0;
        while( len > 0 )
        {
            // If still not all bytes read
            count = inputStream.read( arr, offs, len );
            len -= count;
            offs += count;
        }
    }
}
//#endif