| BytesMessage.java |
/*
* JBoss, the OpenSource EJB server
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package javax.jms;
/** A <CODE>BytesMessage</CODE> object is used to send a message containing a
* stream of uninterpreted bytes. It inherits from the <CODE>Message</CODE>
* interface and adds a bytes
* message body. The receiver of the message supplies the interpretation
* of the bytes.
*
* <P>The <CODE>BytesMessage</CODE> methods are based largely on those found in
* <CODE>java.io.DataInputStream</CODE> and
* <CODE>java.io.DataOutputStream</CODE>.
*
* <P>This message type is for client encoding of existing message formats.
* If possible, one of the other self-defining message types should be used
* instead.
*
* <P>Although the JMS API allows the use of message properties with byte
* messages, they are typically not used, since the inclusion of properties
* may affect the format.
*
* <P>The primitive types can be written explicitly using methods
* for each type. They may also be written generically as objects.
* For instance, a call to <CODE>BytesMessage.writeInt(6)</CODE> is
* equivalent to <CODE>BytesMessage.writeObject(new Integer(6))</CODE>.
* Both forms are provided, because the explicit form is convenient for
* static programming, and the object form is needed when types are not known
* at compile time.
*
* <P>When the message is first created, and when <CODE>clearBody</CODE>
* is called, the body of the message is in write-only mode. After the
* first call to <CODE>reset</CODE> has been made, the message body is in
* read-only mode.
* After a message has been sent, the client that sent it can retain and
* modify it without affecting the message that has been sent. The same message
* object can be sent multiple times.
* When a message has been received, the provider has called
* <CODE>reset</CODE> so that the message body is in read-only mode for the client.
*
* <P>If <CODE>clearBody</CODE> is called on a message in read-only mode,
* the message body is cleared and the message is in write-only mode.
*
* <P>If a client attempts to read a message in write-only mode, a
* <CODE>MessageNotReadableException</CODE> is thrown.
*
* <P>If a client attempts to write a message in read-only mode, a
* <CODE>MessageNotWriteableException</CODE> is thrown.
*
* @see javax.jms.Session#createBytesMessage()
* @see javax.jms.MapMessage
* @see javax.jms.Message
* @see javax.jms.ObjectMessage
* @see javax.jms.StreamMessage
* @see javax.jms.TextMessage
**/
public interface BytesMessage extends Message {
/** Gets the number of bytes of the message body when the message
* is in read-only mode. The value returned can be used to allocate
* a byte array. The value returned is the entire length of the message
* body, regardless of where the pointer for reading the message
* is currently located.
*
* @return number of bytes in the message
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageNotReadableException if the message is in write-only
* mode.
* @since 1.1
*/
public long getBodyLength() throws JMSException;
/** Reads a <code>boolean</code> from the bytes message stream.
*
* @return the <code>boolean</code> value read
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of bytes stream has
* been reached.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public boolean readBoolean() throws JMSException;
/** Reads a signed 8-bit value from the bytes message stream.
*
* @return the next byte from the bytes message stream as a signed 8-bit
* <code>byte</code>
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of bytes stream has
* been reached.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public byte readByte() throws JMSException;
/** Reads an unsigned 8-bit number from the bytes message stream.
*
* @return the next byte from the bytes message stream, interpreted as an
* unsigned 8-bit number
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of bytes stream has
* been reached.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public int readUnsignedByte() throws JMSException;
/** Reads a signed 16-bit number from the bytes message stream.
*
* @return the next two bytes from the bytes message stream, interpreted as
* a signed 16-bit number
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of bytes stream has
* been reached.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public short readShort() throws JMSException;
/** Reads an unsigned 16-bit number from the bytes message stream.
*
* @return the next two bytes from the bytes message stream, interpreted as
* an unsigned 16-bit integer
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of bytes stream has
* been reached.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public int readUnsignedShort() throws JMSException;
/** Reads a Unicode character value from the bytes message stream.
*
* @return the next two bytes from the bytes message stream as a Unicode
* character
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of bytes stream has
* been reached.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public char readChar() throws JMSException;
/** Reads a signed 32-bit integer from the bytes message stream.
*
* @return the next four bytes from the bytes message stream, interpreted
* as an <code>int</code>
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of bytes stream has
* been reached.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public int readInt() throws JMSException;
/** Reads a signed 64-bit integer from the bytes message stream.
*
* @return the next eight bytes from the bytes message stream, interpreted
* as a <code>long</code>
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of bytes stream has
* been reached.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public long readLong() throws JMSException;
/** Reads a <code>float</code> from the bytes message stream.
*
* @return the next four bytes from the bytes message stream, interpreted
* as a <code>float</code>
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of bytes stream has
* been reached.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public float readFloat() throws JMSException;
/** Reads a <code>double</code> from the bytes message stream.
*
* @return the next eight bytes from the bytes message stream, interpreted
* as a <code>double</code>
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of bytes stream has
* been reached.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public double readDouble() throws JMSException;
/** Reads a string that has been encoded using a modified UTF-8
* format from the bytes message stream.
*
* <P>For more information on the UTF-8 format, see "File System Safe
* UCS Transformation Format (FSS_UTF)", X/Open Preliminary Specification,
* X/Open Company Ltd., Document Number: P316. This information also
* appears in ISO/IEC 10646, Annex P.
*
* @return a Unicode string from the bytes message stream
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of bytes stream has
* been reached.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public String readUTF() throws JMSException;
/** Reads a byte array from the bytes message stream.
*
* <P>If the length of array <code>value</code> is less than the number of
* bytes remaining to be read from the stream, the array should
* be filled. A subsequent call reads the next increment, and so on.
*
* <P>If the number of bytes remaining in the stream is less than the
* length of
* array <code>value</code>, the bytes should be read into the array.
* The return value of the total number of bytes read will be less than
* the length of the array, indicating that there are no more bytes left
* to be read from the stream. The next read of the stream returns -1.
*
* @param value the buffer into which the data is read
*
* @return the total number of bytes read into the buffer, or -1 if
* there is no more data because the end of the stream has been reached
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public int readBytes(byte[] value) throws JMSException;
/** Reads a portion of the bytes message stream.
*
* <P>If the length of array <code>value</code> is less than the number of
* bytes remaining to be read from the stream, the array should
* be filled. A subsequent call reads the next increment, and so on.
*
* <P>If the number of bytes remaining in the stream is less than the
* length of
* array <code>value</code>, the bytes should be read into the array.
* The return value of the total number of bytes read will be less than
* the length of the array, indicating that there are no more bytes left
* to be read from the stream. The next read of the stream returns -1.
*
* <p> If <code>length</code> is negative, or
* <code>length</code> is greater than the length of the array
* <code>value</code>, then an <code>IndexOutOfBoundsException</code> is
* thrown. No bytes will be read from the stream for this exception case.
*
* @param value the buffer into which the data is read
* @param length the number of bytes to read; must be less than or equal to
* <code>value.length</code>
*
* @return the total number of bytes read into the buffer, or -1 if
* there is no more data because the end of the stream has been reached
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
public int readBytes(byte[] value, int length) throws JMSException;
/** Writes a <code>boolean</code> to the bytes message stream as a 1-byte
* value.
* The value <code>true</code> is written as the value
* <code>(byte)1</code>; the value <code>false</code> is written as
* the value <code>(byte)0</code>.
*
* @param value the <code>boolean</code> value to be written
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
*/
public void writeBoolean(boolean value) throws JMSException;
/** Writes a <code>byte</code> to the bytes message stream as a 1-byte
* value.
*
* @param value the <code>byte</code> value to be written
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
*/
public void writeByte(byte value) throws JMSException;
/** Writes a <code>short</code> to the bytes message stream as two bytes,
* high byte first.
*
* @param value the <code>short</code> to be written
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
*/
public void writeShort(short value) throws JMSException;
/** Writes a <code>char</code> to the bytes message stream as a 2-byte
* value, high byte first.
*
* @param value the <code>char</code> value to be written
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
*/
public void writeChar(char value) throws JMSException;
/** Writes an <code>int</code> to the bytes message stream as four bytes,
* high byte first.
*
* @param value the <code>int</code> to be written
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
*/
public void writeInt(int value) throws JMSException;
/** Writes a <code>long</code> to the bytes message stream as eight bytes,
* high byte first.
*
* @param value the <code>long</code> to be written
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
*/
public void writeLong(long value) throws JMSException;
/** Converts the <code>float</code> argument to an <code>int</code> using
* the
* <code>floatToIntBits</code> method in class <code>Float</code>,
* and then writes that <code>int</code> value to the bytes message
* stream as a 4-byte quantity, high byte first.
*
* @param value the <code>float</code> value to be written
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
*/
public void writeFloat(float value) throws JMSException;
/** Converts the <code>double</code> argument to a <code>long</code> using
* the
* <code>doubleToLongBits</code> method in class <code>Double</code>,
* and then writes that <code>long</code> value to the bytes message
* stream as an 8-byte quantity, high byte first.
*
* @param value the <code>double</code> value to be written
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
*/
public void writeDouble(double value) throws JMSException;
/** Writes a string to the bytes message stream using UTF-8 encoding in a
* machine-independent manner.
*
* <P>For more information on the UTF-8 format, see "File System Safe
* UCS Transformation Format (FSS_UTF)", X/Open Preliminary Specification,
* X/Open Company Ltd., Document Number: P316. This information also
* appears in ISO/IEC 10646, Annex P.
*
* @param value the <code>String</code> value to be written
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
*/
public void writeUTF(String value) throws JMSException;
/** Writes a byte array to the bytes message stream.
*
* @param value the byte array to be written
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
*/
public void writeBytes(byte[] value) throws JMSException;
/** Writes a portion of a byte array to the bytes message stream.
*
* @param value the byte array value to be written
* @param offset the initial offset within the byte array
* @param length the number of bytes to use
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
*/
public void writeBytes(byte[] value, int offset, int length) throws JMSException;
/** Writes an object to the bytes message stream.
*
* <P>This method works only for the objectified primitive
* object types (<code>Integer</code>, <code>Double</code>,
* <code>Long</code> ...), <code>String</code> objects, and byte
* arrays.
*
* @param value the object in the Java programming language ("Java
* object") to be written; it must not be null
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageFormatException if the object is of an invalid type.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
* @exception java.lang.NullPointerException if the parameter
* <code>value</code> is null.
*/
public void writeObject(Object value) throws JMSException;
/** Puts the message body in read-only mode and repositions the stream of
* bytes to the beginning.
*
* @exception JMSException if the JMS provider fails to reset the message
* due to some internal error.
* @exception MessageFormatException if the message has an invalid
* format.
*/
public void reset() throws JMSException;
}
| BytesMessage.java |