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import java.io.*;
import javax.jms.*;

/**
 * The BytesMessages class consists only of a main method, which reads a
 * textfile, creates a BytesMessage from it, then reads the message.  It does 
 * not send the message.
 * <p>
 * Specify an existing text file name on the command line when you run 
 * the program.
 * <p>
 * This is not a realistic example of the use of the BytesMessage message type,
 * which is intended for client encoding of existing message formats.  (If 
 * possible, one of the other message types, such as StreamMessage or
 * MapMessage, should be used instead.)  However, it shows how to use a buffer
 * to write or read a BytesMessage when you do not know its length.
 */
public class BytesMessages {

    /**
     * Main method.
     *
     * @param args	the name of the text file used by the example
     */
    public static void main(String[] args) {
        String               filename = null;
        FileInputStream      inStream = null;
        ConnectionFactory    connectionFactory = null;
        Connection           connection = null;
        Session              session = null;
        BytesMessage         bytesMessage = null;
        int                  bytes_read = 0;
        final int            BUFLEN = 64;
        byte[]               buf1 = new byte[BUFLEN];
        byte[]               buf2 = new byte[BUFLEN];
        int                  length = 0;
        int                  exitResult = 0;

    	/*
    	 * Read text file name from command line and create input stream.
    	 */
    	if (args.length != 1) {
    	    System.out.println("Usage: java BytesMessages <filename>");
    	    System.exit(1);
    	}
    	try {
    	    filename = new String(args[0]);
            inStream = new FileInputStream(filename);
    	} catch (IOException e) {
    	    System.out.println("Problem getting file: " + e.toString());
            System.exit(1);
    	}
    	
        try {
            connectionFactory = 
                SampleUtilities.getConnectionFactory();
            connection = 
                connectionFactory.createConnection();
            session = connection.createSession(false, 
                Session.AUTO_ACKNOWLEDGE);
    	} catch (Exception e) {
            System.out.println("Connection problem: " + e.toString());
            if (connection != null) {
                try {
                    connection.close();
                } catch (JMSException ee) {}
            }
    	    System.exit(1);
    	} 

        try {
            /* 
             * Create a BytesMessage.
             * Read a byte stream from the input stream into a buffer and
             * construct a BytesMessage, using the three-argument form 
             * of the writeBytes method to ensure that the message contains 
             * only the bytes read from the file, not any leftover characters 
             * in the buffer.
             */
            bytesMessage = session.createBytesMessage();
            while ((bytes_read = inStream.read(buf1)) != -1) {
                bytesMessage.writeBytes(buf1, 0, bytes_read);
                System.out.println("Writing " + bytes_read 
                    + " bytes into message");
            }
            
            /*
             * Reset the message to the beginning, then use readBytes to
             * extract its contents into another buffer, casting the byte array
             * elements to char so that they will display intelligibly.
             */
            bytesMessage.reset();
            do {
                length = bytesMessage.readBytes(buf2);
                if (length != -1) {
                    System.out.println("Reading " + length
                        + " bytes from message: ");
                    for (int i = 0; i < length; i++) {
                        System.out.print((char)buf2[i]);
                    }
                }
                System.out.println();
            } while (length >= BUFLEN);
        } catch (JMSException e) {
            System.out.println("JMS exception occurred: " + e.toString());
            exitResult = 1;
        } catch (IOException e) {
            System.out.println("I/O exception occurred: " + e.toString());
            exitResult = 1;
        } finally {
            if (connection != null) {
                try {
                    connection.close();
                } catch (JMSException e) {
                    exitResult = 1;
                }
            }
        }
        SampleUtilities.exit(exitResult);
    }
}
