javax.jms
Interface MapMessage

All Superinterfaces:

Message

public interface MapMessage
extends Message

A MapMessage object is used to send a set of name-value pairs. The names are String objects, and the values are primitive data types in the Java programming language. The names must have a value that is not null, and not an empty string. The entries can be accessed sequentially or randomly by name. The order of the entries is undefined. MapMessage inherits from the Message interface and adds a message body that contains a Map.

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 MapMessage.setInt("foo", 6) is equivalent to MapMessage.setObject("foo", 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 a client receives a MapMessage, it is in read-only mode. If a client attempts to write to the message at this point, a MessageNotWriteableException is thrown. If clearBody is called, the message can now be both read from and written to.

MapMessage objects support the following conversion table. The marked cases must be supported. The unmarked cases must throw a JMSException. The String-to-primitive conversions may throw a runtime exception if the primitive's valueOf() method does not accept it as a valid 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 valueOf(String) conversion method with a null value. Since char does not support a String conversion, attempting to read a null value as a char must throw a NullPointerException.

Version:

1.1 February 2, 002

Author:

Mark Hapner, Rich Burridge

See Also:

Session.createMapMessage(), BytesMessage, Message, ObjectMessage, StreamMessage, TextMessage

Field Summary

Fields inherited from interface javax.jms.Message

DEFAULT_DELIVERY_MODE, DEFAULT_PRIORITY, DEFAULT_TIME_TO_LIVE

Method Summary

boolean	getBoolean(String name) Returns the boolean value with the specified name.
byte	getByte(String name) Returns the byte value with the specified name.
byte[]	getBytes(String name) Returns the byte array value with the specified name.
char	getChar(String name) Returns the Unicode character value with the specified name.
double	getDouble(String name) Returns the double value with the specified name.
float	getFloat(String name) Returns the float value with the specified name.
int	getInt(String name) Returns the int value with the specified name.
long	getLong(String name) Returns the long value with the specified name.
Enumeration	getMapNames() Returns an Enumeration of all the names in the MapMessage object.
Object	getObject(String name) Returns the value of the object with the specified name.
short	getShort(String name) Returns the short value with the specified name.
String	getString(String name) Returns the String value with the specified name.
boolean	itemExists(String name) Indicates whether an item exists in this MapMessage object.
void	setBoolean(String name, boolean value) Sets a boolean value with the specified name into the Map.
void	setByte(String name, byte value) Sets a byte value with the specified name into the Map.
void	setBytes(String name, byte[] value) Sets a byte array value with the specified name into the Map.
void	setBytes(String name, byte[] value, int offset, int length) Sets a portion of the byte array value with the specified name into the Map.
void	setChar(String name, char value) Sets a Unicode character value with the specified name into the Map.
void	setDouble(String name, double value) Sets a double value with the specified name into the Map.
void	setFloat(String name, float value) Sets a float value with the specified name into the Map.
void	setInt(String name, int value) Sets an int value with the specified name into the Map.
void	setLong(String name, long value) Sets a long value with the specified name into the Map.
void	setObject(String name, Object value) Sets an object value with the specified name into the Map.
void	setShort(String name, short value) Sets a short value with the specified name into the Map.
void	setString(String name, String value) Sets a String value with the specified name into the Map.

Methods inherited from interface javax.jms.Message

acknowledge, clearBody, clearProperties, getBooleanProperty, getByteProperty, getDoubleProperty, getFloatProperty, getIntProperty, getJMSCorrelationID, getJMSCorrelationIDAsBytes, getJMSDeliveryMode, getJMSDestination, getJMSExpiration, getJMSMessageID, getJMSPriority, getJMSRedelivered, getJMSReplyTo, getJMSTimestamp, getJMSType, getLongProperty, getObjectProperty, getPropertyNames, getShortProperty, getStringProperty, propertyExists, setBooleanProperty, setByteProperty, setDoubleProperty, setFloatProperty, setIntProperty, setJMSCorrelationID, setJMSCorrelationIDAsBytes, setJMSDeliveryMode, setJMSDestination, setJMSExpiration, setJMSMessageID, setJMSPriority, setJMSRedelivered, setJMSReplyTo, setJMSTimestamp, setJMSType, setLongProperty, setObjectProperty, setShortProperty, setStringProperty

Method Detail

getBoolean

boolean getBoolean(String name)
                   throws JMSException

Returns the boolean value with the specified name.

Parameters:

name - the name of the boolean

Returns:

the boolean value with the specified name

Throws:

JMSException - if the JMS provider fails to read the message due to some internal error.

MessageFormatException - if this type conversion is invalid.

getByte

byte getByte(String name)
             throws JMSException

Returns the byte value with the specified name.

Parameters:

name - the name of the byte

Returns:

the byte value with the specified name

Throws:

JMSException - if the JMS provider fails to read the message due to some internal error.

MessageFormatException - if this type conversion is invalid.

getShort

short getShort(String name)
               throws JMSException

Returns the short value with the specified name.

Parameters:

name - the name of the short

Returns:

the short value with the specified name

Throws:

JMSException - if the JMS provider fails to read the message due to some internal error.

MessageFormatException - if this type conversion is invalid.

getChar

char getChar(String name)
             throws JMSException

Returns the Unicode character value with the specified name.

Parameters:

name - the name of the Unicode character

Returns:

the Unicode character value with the specified name

Throws:

JMSException - if the JMS provider fails to read the message due to some internal error.

MessageFormatException - if this type conversion is invalid.

getInt

int getInt(String name)
           throws JMSException

Returns the int value with the specified name.

Parameters:

name - the name of the int

Returns:

the int value with the specified name

Throws:

JMSException - if the JMS provider fails to read the message due to some internal error.

MessageFormatException - if this type conversion is invalid.

getLong

long getLong(String name)
             throws JMSException

Returns the long value with the specified name.

Parameters:

name - the name of the long

Returns:

the long value with the specified name

Throws:

JMSException - if the JMS provider fails to read the message due to some internal error.

MessageFormatException - if this type conversion is invalid.

getFloat

float getFloat(String name)
               throws JMSException

Returns the float value with the specified name.

Parameters:

name - the name of the float

Returns:

the float value with the specified name

Throws:

JMSException - if the JMS provider fails to read the message due to some internal error.

MessageFormatException - if this type conversion is invalid.

getDouble

double getDouble(String name)
                 throws JMSException

Returns the double value with the specified name.

Parameters:

name - the name of the double

Returns:

the double value with the specified name

Throws:

JMSException - if the JMS provider fails to read the message due to some internal error.

MessageFormatException - if this type conversion is invalid.

getString

String getString(String name)
                 throws JMSException

Returns the String value with the specified name.

Parameters:

name - the name of the String

Returns:

the String value with the specified name; if there is no item by this name, a null value is returned

Throws:

JMSException - if the JMS provider fails to read the message due to some internal error.

MessageFormatException - if this type conversion is invalid.

getBytes

byte[] getBytes(String name)
                throws JMSException

Returns the byte array value with the specified name.

Parameters:

name - the name of the byte array

Returns:

a copy of the byte array value with the specified name; if there is no item by this name, a null value is returned.

Throws:

JMSException - if the JMS provider fails to read the message due to some internal error.

MessageFormatException - if this type conversion is invalid.

getObject

Object getObject(String name)
                 throws JMSException

Returns the value of the object with the specified name.

This method can be used to return, in objectified format, an object in the Java programming language ("Java object") that had been stored in the Map with the equivalent setObject method call, or its equivalent primitive settype method.

Note that byte values are returned as byte[], not Byte[].

Parameters:

name - the name of the Java object

Returns:

a copy of the Java object value with the specified name, in objectified format (for example, if the object was set as an int, an Integer is returned); if there is no item by this name, a null value is returned

Throws:

JMSException - if the JMS provider fails to read the message due to some internal error.

getMapNames

Enumeration getMapNames()
                        throws JMSException

Returns an Enumeration of all the names in the MapMessage object.

Returns:

an enumeration of all the names in this MapMessage

Throws:

JMSException - if the JMS provider fails to read the message due to some internal error.

setBoolean

void setBoolean(String name,
                boolean value)
                throws JMSException

Sets a boolean value with the specified name into the Map.

Parameters:

name - the name of the boolean

value - the boolean value to set in the Map

Throws:

JMSException - if the JMS provider fails to write the message due to some internal error.

IllegalArgumentException - if the name is null or if the name is an empty string.

MessageNotWriteableException - if the message is in read-only mode.

setByte

void setByte(String name,
             byte value)
             throws JMSException

Sets a byte value with the specified name into the Map.

Parameters:

name - the name of the byte

value - the byte value to set in the Map

Throws:

JMSException - if the JMS provider fails to write the message due to some internal error.

IllegalArgumentException - if the name is null or if the name is an empty string.

MessageNotWriteableException - if the message is in read-only mode.

setShort

void setShort(String name,
              short value)
              throws JMSException

Sets a short value with the specified name into the Map.

Parameters:

name - the name of the short

value - the short value to set in the Map

Throws:

JMSException - if the JMS provider fails to write the message due to some internal error.

IllegalArgumentException - if the name is null or if the name is an empty string.

MessageNotWriteableException - if the message is in read-only mode.

setChar

void setChar(String name,
             char value)
             throws JMSException

Sets a Unicode character value with the specified name into the Map.

Parameters:

name - the name of the Unicode character

value - the Unicode character value to set in the Map

Throws:

JMSException - if the JMS provider fails to write the message due to some internal error.

IllegalArgumentException - if the name is null or if the name is an empty string.

MessageNotWriteableException - if the message is in read-only mode.

setInt

void setInt(String name,
            int value)
            throws JMSException

Sets an int value with the specified name into the Map.

Parameters:

name - the name of the int

value - the int value to set in the Map

Throws:

JMSException - if the JMS provider fails to write the message due to some internal error.

IllegalArgumentException - if the name is null or if the name is an empty string.

MessageNotWriteableException - if the message is in read-only mode.

setLong

void setLong(String name,
             long value)
             throws JMSException

Sets a long value with the specified name into the Map.

Parameters:

name - the name of the long

value - the long value to set in the Map

Throws:

JMSException - if the JMS provider fails to write the message due to some internal error.

IllegalArgumentException - if the name is null or if the name is an empty string.

MessageNotWriteableException - if the message is in read-only mode.

setFloat

void setFloat(String name,
              float value)
              throws JMSException

Sets a float value with the specified name into the Map.

Parameters:

name - the name of the float

value - the float value to set in the Map

Throws:

JMSException - if the JMS provider fails to write the message due to some internal error.

IllegalArgumentException - if the name is null or if the name is an empty string.

MessageNotWriteableException - if the message is in read-only mode.

setDouble

void setDouble(String name,
               double value)
               throws JMSException

Sets a double value with the specified name into the Map.

Parameters:

name - the name of the double

value - the double value to set in the Map

Throws:

JMSException - if the JMS provider fails to write the message due to some internal error.

IllegalArgumentException - if the name is null or if the name is an empty string.

MessageNotWriteableException - if the message is in read-only mode.

setString

void setString(String name,
               String value)
               throws JMSException

Sets a String value with the specified name into the Map.

Parameters:

name - the name of the String

value - the String value to set in the Map

Throws:

JMSException - if the JMS provider fails to write the message due to some internal error.

IllegalArgumentException - if the name is null or if the name is an empty string.

MessageNotWriteableException - if the message is in read-only mode.

setBytes

void setBytes(String name,
              byte[] value)
              throws JMSException

Sets a byte array value with the specified name into the Map.

Parameters:

name - the name of the byte array

value - the byte array value to set in the Map; the array is copied so that the value for name will not be altered by future modifications

Throws:

JMSException - if the JMS provider fails to write the message due to some internal error.

NullPointerException - if the name is null, or if the name is an empty string.

MessageNotWriteableException - if the message is in read-only mode.

setBytes

void setBytes(String name,
              byte[] value,
              int offset,
              int length)
              throws JMSException

Sets a portion of the byte array value with the specified name into the Map.

Parameters:

name - the name of the byte array

value - the byte array value to set in the Map

offset - the initial offset within the byte array

length - the number of bytes to use

Throws:

JMSException - if the JMS provider fails to write the message due to some internal error.

IllegalArgumentException - if the name is null or if the name is an empty string.

MessageNotWriteableException - if the message is in read-only mode.

setObject

void setObject(String name,
               Object value)
               throws JMSException

Sets an object value with the specified name into the Map.

This method works only for the objectified primitive object types (Integer, Double, Long ...), String objects, and byte arrays.

Parameters:

name - the name of the Java object

value - the Java object value to set in the Map

Throws:

JMSException - if the JMS provider fails to write the message due to some internal error.

IllegalArgumentException - if the name is null or if the name is an empty string.

MessageFormatException - if the object is invalid.

MessageNotWriteableException - if the message is in read-only mode.

itemExists

boolean itemExists(String name)
                   throws JMSException

Indicates whether an item exists in this MapMessage object.

Parameters:

name - the name of the item to test

Returns:

true if the item exists

Throws:

JMSException - if the JMS provider fails to determine if the item exists due to some internal error.