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package javax.jms;
/** A <CODE>StreamMessage</CODE> object is used to send a stream of primitive
* types in the Java programming language. It is filled and read sequentially.
* It inherits from the <CODE>Message</CODE> interface
* and adds a stream message body. Its methods are based largely on those
* found in <CODE>java.io.DataInputStream</CODE> and
* <CODE>java.io.DataOutputStream</CODE>.
*
* <P>The primitive types can be read or written explicitly using methods
* for each type. They may also be read or written generically as objects.
* For instance, a call to <CODE>StreamMessage.writeInt(6)</CODE> is
* equivalent to <CODE>StreamMessage.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 body 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.
*
* <P><CODE>StreamMessage</CODE> objects support the following conversion
* table. The marked cases must be supported. The unmarked cases must throw a
* <CODE>JMSException</CODE>. The <CODE>String</CODE>-to-primitive conversions
* may throw a runtime exception if the primitive's <CODE>valueOf()</CODE>
* method does not accept it as a valid <CODE>String</CODE> representation of
* the primitive.
*
* <P>A value written as the row type can be read as the column type.
*
* <PRE>
* | | boolean byte short char int long float double String byte[]
* |----------------------------------------------------------------------
* |boolean | X X
* |byte | X X X X X
* |short | X X X X
* |char | X X
* |int | X X X
* |long | X X
* |float | X X X
* |double | X X
* |String | X X X X X X X X
* |byte[] | X
* |----------------------------------------------------------------------
* </PRE>
*
* <P>Attempting to read a null value as a primitive type must be treated
* as calling the primitive's corresponding <code>valueOf(String)</code>
* conversion method with a null value. Since <code>char</code> does not
* support a <code>String</code> conversion, attempting to read a null value
* as a <code>char</code> must throw a <code>NullPointerException</code>.
*
* @version 1.0 - 6 August 1998
* @author Mark Hapner
* @author Rich Burridge
*
* @see javax.jms.Session#createStreamMessage()
* @see javax.jms.BytesMessage
* @see javax.jms.MapMessage
* @see javax.jms.Message
* @see javax.jms.ObjectMessage
* @see javax.jms.TextMessage
*/
public interface StreamMessage extends Message {
/** Reads a <code>boolean</code> from the stream message.
*
* @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 message stream has
* been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
boolean
readBoolean() throws JMSException;
/** Reads a <code>byte</code> value from the stream message.
*
* @return the next byte from the stream message as a 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 message stream has
* been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
byte
readByte() throws JMSException;
/** Reads a 16-bit integer from the stream message.
*
* @return a 16-bit integer from the stream message
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has
* been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
short
readShort() throws JMSException;
/** Reads a Unicode character value from the stream message.
*
* @return a Unicode character from the stream message
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has
* been reached.
* @exception MessageFormatException if this type conversion is invalid
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
char
readChar() throws JMSException;
/** Reads a 32-bit integer from the stream message.
*
* @return a 32-bit integer value from the stream message, 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 message stream has
* been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
int
readInt() throws JMSException;
/** Reads a 64-bit integer from the stream message.
*
* @return a 64-bit integer value from the stream message, 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 message stream has
* been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
long
readLong() throws JMSException;
/** Reads a <code>float</code> from the stream message.
*
* @return a <code>float</code> value from the stream message
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has
* been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
float
readFloat() throws JMSException;
/** Reads a <code>double</code> from the stream message.
*
* @return a <code>double</code> value from the stream message
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has
* been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
double
readDouble() throws JMSException;
/** Reads a <CODE>String</CODE> from the stream message.
*
* @return a Unicode string from the stream message
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has
* been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*/
String
readString() throws JMSException;
/** Reads a byte array field from the stream message into the
* specified <CODE>byte[]</CODE> object (the read buffer).
*
* <P>To read the field value, <CODE>readBytes</CODE> should be
* successively called
* until it returns a value less than the length of the read buffer.
* The value of the bytes in the buffer following the last byte
* read is undefined.
*
* <P>If <CODE>readBytes</CODE> returns a value equal to the length of the
* buffer, a subsequent <CODE>readBytes</CODE> call must be made. If there
* are no more bytes to be read, this call returns -1.
*
* <P>If the byte array field value is null, <CODE>readBytes</CODE>
* returns -1.
*
* <P>If the byte array field value is empty, <CODE>readBytes</CODE>
* returns 0.
*
* <P>Once the first <CODE>readBytes</CODE> call on a <CODE>byte[]</CODE>
* field value has been made,
* the full value of the field must be read before it is valid to read
* the next field. An attempt to read the next field before that has
* been done will throw a <CODE>MessageFormatException</CODE>.
*
* <P>To read the byte field value into a new <CODE>byte[]</CODE> object,
* use the <CODE>readObject</CODE> method.
*
* @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 byte field has been
* reached
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has
* been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*
* @see #readObject()
*/
int
readBytes(byte[] value) throws JMSException;
/** Reads an object from the stream message.
*
* <P>This method can be used to return, in objectified format,
* an object in the Java programming language ("Java object") that has
* been written to the stream with the equivalent
* <CODE>writeObject</CODE> method call, or its equivalent primitive
* <CODE>write<I>type</I></CODE> method.
*
* <P>Note that byte values are returned as <CODE>byte[]</CODE>, not
* <CODE>Byte[]</CODE>.
*
* <P>An attempt to call <CODE>readObject</CODE> to read a byte field
* value into a new <CODE>byte[]</CODE> object before the full value of the
* byte field has been read will throw a
* <CODE>MessageFormatException</CODE>.
*
* @return a Java object from the stream message, in objectified
* format (for example, if the object was written as an <CODE>int</CODE>,
* an <CODE>Integer</CODE> is returned)
*
* @exception JMSException if the JMS provider fails to read the message
* due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has
* been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only
* mode.
*
* @see #readBytes(byte[] value)
*/
Object
readObject() throws JMSException;
/** Writes a <code>boolean</code> to the stream message.
* 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.
*/
void
writeBoolean(boolean value)
throws JMSException;
/** Writes a <code>byte</code> to the stream message.
*
* @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.
*/
void
writeByte(byte value) throws JMSException;
/** Writes a <code>short</code> to the stream message.
*
* @param value the <code>short</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.
*/
void
writeShort(short value) throws JMSException;
/** Writes a <code>char</code> to the stream message.
*
* @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.
*/
void
writeChar(char value) throws JMSException;
/** Writes an <code>int</code> to the stream message.
*
* @param value the <code>int</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.
*/
void
writeInt(int value) throws JMSException;
/** Writes a <code>long</code> to the stream message.
*
* @param value the <code>long</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.
*/
void
writeLong(long value) throws JMSException;
/** Writes a <code>float</code> to the stream message.
*
* @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.
*/
void
writeFloat(float value) throws JMSException;
/** Writes a <code>double</code> to the stream message.
*
* @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.
*/
void
writeDouble(double value) throws JMSException;
/** Writes a <code>String</code> to the stream message.
*
* @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.
*/
void
writeString(String value) throws JMSException;
/** Writes a byte array field to the stream message.
*
* <P>The byte array <code>value</code> is written to the message
* as a byte array field. Consecutively written byte array fields are
* treated as two distinct fields when the fields are read.
*
* @param value the byte array 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.
*/
void
writeBytes(byte[] value) throws JMSException;
/** Writes a portion of a byte array as a byte array field to the stream
* message.
*
* <P>The a portion of the byte array <code>value</code> is written to the
* message as a byte array field. Consecutively written byte
* array fields are treated as two distinct fields when the fields are
* read.
*
* @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.
*/
void
writeBytes(byte[] value, int offset, int length)
throws JMSException;
/** Writes an object to the stream message.
*
* <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 Java object to be written
*
* @exception JMSException if the JMS provider fails to write the message
* due to some internal error.
* @exception MessageFormatException if the object is invalid.
* @exception MessageNotWriteableException if the message is in read-only
* mode.
*/
void
writeObject(Object value) throws JMSException;
/** Puts the message body in read-only mode and repositions the stream
* 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.
*/
void
reset() throws JMSException;
}
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