org.codehaus.activemq.message
Class ActiveMQMapMessage

java.lang.Object
  extended byorg.codehaus.activemq.message.AbstractPacket
      extended byorg.codehaus.activemq.message.ActiveMQMessage
          extended byorg.codehaus.activemq.message.ActiveMQMapMessage
All Implemented Interfaces:
Comparable, MapMessage, Message, Packet

public class ActiveMQMapMessage
extends ActiveMQMessage
implements MapMessage

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.

See Also:
Session.createMapMessage(), BytesMessage, Message, ObjectMessage, StreamMessage, TextMessage

Field Summary
 
Fields inherited from class org.codehaus.activemq.message.ActiveMQMessage
BROKER_NAME_INDEX, CID_INDEX, CLUSTER_NAME_INDEX, CORRELATION_INDEX, DISPATCHED_FROM_DLQ_INDEX, EXPIRATION_INDEX, PAYLOAD_INDEX, PROPERTIES_INDEX, readOnlyMessage, REDELIVERED_INDEX, REPLY_TO_INDEX, TIMESTAMP_INDEX, TRANSACTION_ID_INDEX, TYPE_INDEX, XA_TRANS_INDEX
 
Fields inherited from class org.codehaus.activemq.message.AbstractPacket
bitArray, BROKERS_VISITED_INDEX, RECEIPT_REQUIRED_INDEX
 
Fields inherited from interface javax.jms.Message
DEFAULT_DELIVERY_MODE, DEFAULT_PRIORITY, DEFAULT_TIME_TO_LIVE
 
Fields inherited from interface org.codehaus.activemq.message.Packet
ACTIVEMQ_BROKER_INFO, ACTIVEMQ_BYTES_MESSAGE, ACTIVEMQ_CONNECTION_INFO, ACTIVEMQ_MAP_MESSAGE, ACTIVEMQ_MESSAGE, ACTIVEMQ_MSG_ACK, ACTIVEMQ_OBJECT_MESSAGE, ACTIVEMQ_STREAM_MESSAGE, ACTIVEMQ_TEXT_MESSAGE, BROKER_ADMIN_COMMAND, CAPACITY_INFO, CAPACITY_INFO_REQUEST, CONSUMER_INFO, DURABLE_UNSUBSCRIBE, INT_RESPONSE_RECEIPT_INFO, KEEP_ALIVE, PRODUCER_INFO, RECEIPT_INFO, RESPONSE_RECEIPT_INFO, SESSION_INFO, TRANSACTION_INFO, WIRE_FORMAT_INFO, XA_TRANSACTION_INFO
 
Constructor Summary
ActiveMQMapMessage()
           
 
Method Summary
 void clearBody()
          Clears out the message body.
 ActiveMQMessage deepCopy()
           
 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.
 int getPacketType()
          Return the type of Packet
 short getShort(String name)
          Returns the short value with the specified name.
 String getString(String name)
          Returns the String value with the specified name.
 HashMap getTable()
           
 boolean itemExists(String name)
          Indicates whether an item exists in this MapMessage object.
protected  void put(String name, Object value)
           
protected  void readBody(DataInput dataIn)
          Used to help build the body from an input stream
 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.
 void setTable(HashMap newTable)
          set the table body
 ActiveMQMessage shallowCopy()
           
 String toString()
           
protected  void writeBody(DataOutput dataOut)
          Used serialize the message body to an output stream
 
Methods inherited from class org.codehaus.activemq.message.ActiveMQMessage
acknowledge, buildBodyFromBytes, clearProperties, compareTo, compareTo, convertBodyToBytes, equals, getBodyAsBytes, getBooleanProperty, getByteProperty, getConsumerId, getConsumerNos, getConsumerNosAsString, getDeliveryCount, getDoubleProperty, getEntryBrokerName, getEntryClusterName, getFloatProperty, getIntProperty, getJMSActiveMQDestination, getJMSClientID, getJMSCorrelationID, getJMSCorrelationIDAsBytes, getJMSDeliveryMode, getJMSDestination, getJMSExpiration, getJMSMessageID, getJMSMessageIdentity, getJMSPriority, getJMSRedelivered, getJMSReplyTo, getJMSTimestamp, getJMSType, getLongProperty, getMessageAcknowledge, getObjectProperty, getProducerID, getProperties, getPropertyNames, getSequenceNumber, getShortProperty, getStringProperty, getTransactionId, hashCode, incrementDeliveryCount, initializeOther, isConsumerTarget, isDispatchedFromDLQ, isEntryBroker, isEntryCluster, isExpired, isExpired, isJMSMessage, isMessageConsumed, isPartOfTransaction, isPersistent, isTemporary, isTransientConsumed, isXaTransacted, prepareMessageBody, propertyExists, readMapProperties, setBodyAsBytes, setBooleanProperty, setByteProperty, setConsumerId, setConsumerNos, setDeliveryCount, setDispatchedFromDLQ, setDoubleProperty, setEntryBrokerName, setEntryClusterName, setFloatProperty, setIntProperty, setJMSClientID, setJMSCorrelationID, setJMSCorrelationIDAsBytes, setJMSDeliveryMode, setJMSDestination, setJMSExpiration, setJMSMessageID, setJMSMessageIdentity, setJMSPriority, setJMSRedelivered, setJMSReplyTo, setJMSTimestamp, setJMSType, setLongProperty, setMessageAcknowledge, setMessageConsumed, setObjectProperty, setProducerID, setProperties, setReadOnly, setSequenceNumber, setShortProperty, setStringProperty, setTransactionId, setTransientConsumed, setXaTransacted, writeMapProperties
 
Methods inherited from class org.codehaus.activemq.message.AbstractPacket
addBrokerVisited, decrementMemoryReferenceCount, equals, getBitArray, getBrokersVisited, getBrokersVisitedAsString, getId, getMemoryUsage, getMemoryUsageReferenceCount, getPacketTypeAsString, hasVisited, incrementMemoryReferenceCount, initializeOther, isReceipt, isReceiptRequired, setBitArray, setId, setMemoryUsage, setReceiptRequired
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface javax.jms.Message
acknowledge, 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
 

Constructor Detail

ActiveMQMapMessage

public ActiveMQMapMessage()
Method Detail

getPacketType

public int getPacketType()
Return the type of Packet

Specified by:
getPacketType in interface Packet
Overrides:
getPacketType in class ActiveMQMessage
Returns:
integer representation of the type of Packet

shallowCopy

public ActiveMQMessage shallowCopy()
                            throws JMSException
Overrides:
shallowCopy in class ActiveMQMessage
Returns:
Returns a shallow copy of the message instance
Throws:
JMSException

deepCopy

public ActiveMQMessage deepCopy()
                         throws JMSException
Overrides:
deepCopy in class ActiveMQMessage
Returns:
Returns a deep copy of the message - note the header fields are only shallow copied
Throws:
JMSException

setTable

public void setTable(HashMap newTable)
set the table body

Parameters:
newTable - the new data to set

getTable

public HashMap getTable()
                 throws JMSException
Returns:
Returns the table body
Throws:
JMSException

clearBody

public void clearBody()
               throws JMSException
Clears out the message body. Clearing a message's body does not clear its header values or property entries.

If this message body was read-only, calling this method leaves the message body in the same state as an empty body in a newly created message.

Specified by:
clearBody in interface Message
Overrides:
clearBody in class ActiveMQMessage
Throws:
JMSException - if the JMS provider fails to clear the message body due to some internal error.

getBoolean

public boolean getBoolean(String name)
                   throws JMSException
Returns the boolean value with the specified name.

Specified by:
getBoolean in interface MapMessage
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

public byte getByte(String name)
             throws JMSException
Returns the byte value with the specified name.

Specified by:
getByte in interface MapMessage
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

public short getShort(String name)
               throws JMSException
Returns the short value with the specified name.

Specified by:
getShort in interface MapMessage
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

public char getChar(String name)
             throws JMSException
Returns the Unicode character value with the specified name.

Specified by:
getChar in interface MapMessage
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

public int getInt(String name)
           throws JMSException
Returns the int value with the specified name.

Specified by:
getInt in interface MapMessage
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

public long getLong(String name)
             throws JMSException
Returns the long value with the specified name.

Specified by:
getLong in interface MapMessage
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

public float getFloat(String name)
               throws JMSException
Returns the float value with the specified name.

Specified by:
getFloat in interface MapMessage
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

public double getDouble(String name)
                 throws JMSException
Returns the double value with the specified name.

Specified by:
getDouble in interface MapMessage
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

public String getString(String name)
                 throws JMSException
Returns the String value with the specified name.

Specified by:
getString in interface MapMessage
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

public byte[] getBytes(String name)
                throws JMSException
Returns the byte array value with the specified name.

Specified by:
getBytes in interface MapMessage
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

public 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 set type method.

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

Specified by:
getObject in interface MapMessage
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

public Enumeration getMapNames()
                        throws JMSException
Returns an Enumeration of all the names in the MapMessage object.

Specified by:
getMapNames in interface MapMessage
Returns:
an enumeration of all the names in this MapMessage
Throws:
JMSException

put

protected void put(String name,
                   Object value)
            throws JMSException
Throws:
JMSException

setBoolean

public void setBoolean(String name,
                       boolean value)
                throws JMSException
Sets a boolean value with the specified name into the Map.

Specified by:
setBoolean in interface MapMessage
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

public void setByte(String name,
                    byte value)
             throws JMSException
Sets a byte value with the specified name into the Map.

Specified by:
setByte in interface MapMessage
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

public void setShort(String name,
                     short value)
              throws JMSException
Sets a short value with the specified name into the Map.

Specified by:
setShort in interface MapMessage
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

public void setChar(String name,
                    char value)
             throws JMSException
Sets a Unicode character value with the specified name into the Map.

Specified by:
setChar in interface MapMessage
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

public void setInt(String name,
                   int value)
            throws JMSException
Sets an int value with the specified name into the Map.

Specified by:
setInt in interface MapMessage
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

public void setLong(String name,
                    long value)
             throws JMSException
Sets a long value with the specified name into the Map.

Specified by:
setLong in interface MapMessage
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

public void setFloat(String name,
                     float value)
              throws JMSException
Sets a float value with the specified name into the Map.

Specified by:
setFloat in interface MapMessage
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

public void setDouble(String name,
                      double value)
               throws JMSException
Sets a double value with the specified name into the Map.

Specified by:
setDouble in interface MapMessage
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

public void setString(String name,
                      String value)
               throws JMSException
Sets a String value with the specified name into the Map.

Specified by:
setString in interface MapMessage
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

public void setBytes(String name,
                     byte[] value)
              throws JMSException
Sets a byte array value with the specified name into the Map.

Specified by:
setBytes in interface MapMessage
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

public 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.

Specified by:
setBytes in interface MapMessage
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

public 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.

Specified by:
setObject in interface MapMessage
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.

writeBody

protected void writeBody(DataOutput dataOut)
                  throws IOException
Description copied from class: ActiveMQMessage
Used serialize the message body to an output stream

Overrides:
writeBody in class ActiveMQMessage
Parameters:
dataOut -
Throws:
IOException

readBody

protected void readBody(DataInput dataIn)
                 throws IOException
Description copied from class: ActiveMQMessage
Used to help build the body from an input stream

Overrides:
readBody in class ActiveMQMessage
Parameters:
dataIn -
Throws:
IOException

itemExists

public boolean itemExists(String name)
                   throws JMSException
Indicates whether an item exists in this MapMessage object.

Specified by:
itemExists in interface MapMessage
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.

toString

public String toString()
Overrides:
toString in class ActiveMQMessage
Returns:
pretty print of this Message


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