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package javax.jms;

/** A <CODE>TextMessage</CODE> object is used to send a message containing a 
  * <CODE>java.lang.String</CODE>.
  * It inherits from the <CODE>Message</CODE> interface and adds a text message 
  * body.
  *
  * <P>This message type can be used to transport text-based messages, including
  *  those with XML content.
  *
  * <P>When a client receives a <CODE>TextMessage</CODE>, it is in read-only 
  * mode. If a client attempts to write to the message at this point, a 
  * <CODE>MessageNotWriteableException</CODE> is thrown. If 
  * <CODE>clearBody</CODE> is 
  * called, the message can now be both read from and written to.
  *
  * @version     1.1 - February 2, 2002
  * @author      Mark Hapner
  * @author      Rich Burridge
  * @author      Kate Stout
  *
  * @see         javax.jms.Session#createTextMessage()
  * @see         javax.jms.Session#createTextMessage(String)
  * @see         javax.jms.BytesMessage
  * @see         javax.jms.MapMessage
  * @see         javax.jms.Message
  * @see         javax.jms.ObjectMessage
  * @see         javax.jms.StreamMessage
  * @see         java.lang.String
  */
 
public interface TextMessage extends Message { 

    /** Sets the string containing this message's data.
      *  
      * @param string the <CODE>String</CODE> containing the message's data
      *  
      * @exception JMSException if the JMS provider fails to set the text due to
      *                         some internal error.
      * @exception MessageNotWriteableException if the message is in read-only 
      *                                         mode.
      */ 

    void
    setText(String string) throws JMSException;


    /** Gets the string containing this message's data.  The default
      * value is null.
      *  
      * @return the <CODE>String</CODE> containing the message's data
      *  
      * @exception JMSException if the JMS provider fails to get the text due to
      *                         some internal error.
      */ 

    String
    getText() throws JMSException;
}