Github user gemmellr commented on a diff in the pull request:

    https://github.com/apache/qpid-proton/pull/89#discussion_r88247744
  
    --- Diff: 
proton-j/src/main/java/org/apache/qpid/proton/amqp/transport/ReceiverSettleMode.java
 ---
    @@ -25,13 +25,32 @@
     
     import org.apache.qpid.proton.amqp.UnsignedByte;
     
    +import java.util.HashMap;
    +import java.util.Map;
    +
     public enum ReceiverSettleMode
     {
    -    FIRST, SECOND;
    +    FIRST(0),
    +    SECOND(1);
    +
    +    private UnsignedByte value;
    +    private static Map<UnsignedByte, ReceiverSettleMode> map = new 
HashMap<>();
    +
    +    private ReceiverSettleMode(int value) {
    +        this.value = UnsignedByte.valueOf((byte)value);
    +    }
     
    -    public UnsignedByte getValue()
    -    {
    -        return UnsignedByte.valueOf((byte)ordinal());
    +    static {
    +        for (ReceiverSettleMode mode: ReceiverSettleMode.values()) {
    +            map.put(mode.value, mode);
    +        }
         }
     
    +    public static ReceiverSettleMode valueOf(UnsignedByte value) {
    +        return map.get(value);
    --- End diff --
    
    I think its worth throwing IAE if an out of bound value is provided, rather 
than just returning null.


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