Package org.apache.qpid.jms.provider.amqp.message

Class AmqpMessageIdHelper

java.lang.Object
org.apache.qpid.jms.provider.amqp.message.AmqpMessageIdHelper
public class AmqpMessageIdHelper extends Object
Helper class for identifying and converting message-id and correlation-id values between the AMQP types and the Strings values used by JMS.

AMQP messages allow for 4 types of message-id/correlation-id: message-id-string, message-id-binary, message-id-uuid, or message-id-ulong. In order to accept or return a string representation of these for interoperability with other AMQP clients, the following encoding can be used after removing or before adding the "ID:" prefix used for a JMSMessageID value:
"AMQP_BINARY:<hex representation of binary content>"
"AMQP_UUID:<string representation of uuid>"
"AMQP_ULONG:<string representation of ulong>"
"AMQP_STRING:<string>"

The AMQP_STRING encoding exists only for escaping message-id-string values that happen to begin with one of the encoding prefixes (including AMQP_STRING itself). It MUST NOT be used otherwise.

When provided a string for conversion which attempts to identify itself as an encoded binary, uuid, or ulong but can't be converted into the indicated format, an exception will be thrown.

  • Field Details

  • Constructor Details

    • AmqpMessageIdHelper

      public AmqpMessageIdHelper()

  • Method Details

    • hasMessageIdPrefix

      public static boolean hasMessageIdPrefix(String string)
      Checks whether the given string begins with "ID:" prefix used to denote a JMSMessageID
      Parameters:
      string - the string to check
      Returns:
      true if and only id the string begins with "ID:"

    • toMessageIdString

      public static String toMessageIdString(Object idObject)

    • toCorrelationIdString

      public static String toCorrelationIdString(Object idObject)

    • toIdObject

      public static Object toIdObject(String origId) throws IdConversionException
      Takes the provided id string and return the appropriate amqp messageId style object. Converts the type based on any relevant encoding information found as a prefix.
      Parameters:
      origId - the object to be converted
      Returns:
      the amqp messageId style object
      Throws:
      IdConversionException - if the provided baseId String indicates an encoded type but can't be converted to that type.

    • convertHexStringToBinary

      public static byte[] convertHexStringToBinary(String hexString) throws IllegalArgumentException
      Convert the provided hex-string into a binary representation where each byte represents two characters of the hex string. The hex characters may be upper or lower case.
      Parameters:
      hexString - string to convert
      Returns:
      a byte array containing the binary representation
      Throws:
      IllegalArgumentException - if the provided String is a non-even length or contains non-hex characters

    • convertBinaryToHexString

      public static String convertBinaryToHexString(byte[] bytes)
      Convert the provided binary into a hex-string representation where each character represents 4 bits of the provided binary, i.e each byte requires two characters. The returned hex characters are upper-case.
      Parameters:
      bytes - binary to convert
      Returns:
      a String containing a hex representation of the bytes