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package javax.jms;
/** A {@code StreamMessage} 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} interface
* and adds a stream message body. Its methods are based largely on those
* found in {@code java.io.DataInputStream} and
* {@code java.io.DataOutputStream}.
*
* 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)} is
* equivalent to {@code StreamMessage.writeObject(new Integer(6))}.
* 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.
*
*
When the message is first created, and when {@code clearBody}
* is called, the body of the message is in write-only mode. After the
* first call to {@code reset} 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} so that the message body is in read-only mode for the client.
*
*
If {@code clearBody} is called on a message in read-only mode,
* the message body is cleared and the message body is in write-only mode.
*
*
If a client attempts to read a message in write-only mode, a
* {@code MessageNotReadableException} is thrown.
*
*
If a client attempts to write a message in read-only mode, a
* {@code MessageNotWriteableException} is thrown.
*
*
{@code StreamMessage} objects support the following conversion
* table. The marked cases must be supported. The unmarked cases must throw a
* {@code JMSException}. The {@code String}-to-primitive conversions
* may throw a runtime exception if the primitive's {@code valueOf()}
* method does not accept it as a valid {@code String} representation of
* the primitive.
*
*
A value written as the row type can be read as the column type.
*
*
* | | 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
* |----------------------------------------------------------------------
*
*
* Attempting to read a null value as a primitive type must be treated
* as calling the primitive's corresponding {@code valueOf(String)}
* conversion method with a null value. Since {@code char} does not
* support a {@code String} conversion, attempting to read a null value
* as a {@code char} must throw a {@code NullPointerException}.
*
* @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} from the stream message.
*
* @return the {@code boolean} 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} value from the stream message.
*
* @return the next byte from the stream message as a 8-bit
* {@code byte}
*
* @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}
*
* @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}
*
* @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} from the stream message.
*
* @return a {@code float} 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} from the stream message.
*
* @return a {@code double} 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} 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[]} object (the read buffer).
*
*
To read the field value, {@code readBytes} 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.
*
*
If {@code readBytes} returns a value equal to the length of the
* buffer, a subsequent {@code readBytes} call must be made. If there
* are no more bytes to be read, this call returns -1.
*
*
If the byte array field value is null, {@code readBytes}
* returns -1.
*
*
If the byte array field value is empty, {@code readBytes}
* returns 0.
*
*
Once the first {@code readBytes} call on a {@code byte[]}
* 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}.
*
*
To read the byte field value into a new {@code byte[]} object,
* use the {@code readObject} 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.
*
*
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} method call, or its equivalent primitive
* {@code writetype} method.
*
*
Note that byte values are returned as {@code byte[]}, not
* {@code Byte[]}.
*
*
An attempt to call {@code readObject} to read a byte field
* value into a new {@code byte[]} object before the full value of the
* byte field has been read will throw a
* {@code MessageFormatException}.
*
* @return a Java object from the stream message, in objectified
* format (for example, if the object was written as an {@code int},
* an {@code Integer} 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} to the stream message.
* The value {@code true} is written as the value
* {@code (byte)1}; the value {@code false} is written as
* the value {@code (byte)0}.
*
* @param value the {@code boolean} 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} to the stream message.
*
* @param value the {@code byte} 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} to the stream message.
*
* @param value the {@code short} 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} to the stream message.
*
* @param value the {@code char} 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} to the stream message.
*
* @param value the {@code int} 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} to the stream message.
*
* @param value the {@code long} 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} to the stream message.
*
* @param value the {@code float} 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} to the stream message.
*
* @param value the {@code double} 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} to the stream message.
*
* @param value the {@code String} 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.
*
*
The byte array {@code value} 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.
*
*
The a portion of the byte array {@code value} 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.
*
*
This method works only for the objectified primitive
* object types ({@code Integer}, {@code Double},
* {@code Long} ...), {@code String} 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;
}