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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 15 | arune | 1 | /* |
| 2 | * File created by Jimmy |
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| 3 | * at 2003-sep-03 13:39:58 |
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| 4 | */ |
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| 5 | package Macbeth.Modules.modARNE; |
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| 6 | |||
| 7 | import Macbeth.Utilities.UByte; |
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| 8 | |||
| 9 | /** |
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| 10 | * Represents an ARNE packet that can be transmitted |
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| 11 | * or received to/from an ARNE network. |
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| 12 | * @author Jimmy |
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| 13 | */ |
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| 14 | public class ARNEPacket { |
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| 15 | |||
| 16 | /** |
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| 17 | * Maximum number of data bytes inside an ARNE packet. |
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| 18 | */ |
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| 19 | public static final int MAX_ARNE_DATALEN = 15; |
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| 20 | |||
| 21 | /** |
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| 22 | * The ARNE header bytes. There are always two of them. |
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| 23 | */ |
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| 24 | public UByte[] header; |
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| 25 | |||
| 26 | /** |
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| 27 | * The ARNE data bytes. |
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| 28 | */ |
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| 29 | public UByte[] data; |
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| 30 | |||
| 31 | /** |
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| 32 | * Creates a new instance of ARNEPacket. |
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| 33 | */ |
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| 34 | public ARNEPacket() { |
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| 35 | //always two header bytes |
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| 36 | header = new UByte[2]; |
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| 37 | data = null; |
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| 38 | } |
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| 39 | |||
| 40 | /** |
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| 41 | * Sets the lenght of the data field in this packet. |
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| 42 | * @param size The number of data bytes. |
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| 43 | */ |
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| 44 | public void setDataLen(int size) { |
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| 45 | data = new UByte[size]; |
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| 46 | //first header byte contains startbits and data size |
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| 47 | header[0] = UByte.fromShort((short)(0xA0 | (0x0F & size))); |
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| 48 | } |
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| 49 | |||
| 50 | /** |
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| 51 | * Gets the length of the data field in this packet. |
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| 52 | * @return The number of data bytes. |
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| 53 | */ |
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| 54 | public int getDataLen() { |
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| 55 | if (data!=null) { |
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| 56 | return data.length; |
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| 57 | } else { |
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| 58 | return 0; |
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| 59 | } |
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| 60 | } |
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| 61 | |||
| 62 | /** |
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| 63 | * Sets the node address to which this packet is to |
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| 64 | * be delivered. This address will be saved in the |
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| 65 | * ARNE header. |
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| 66 | * @param address The destination node address. |
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| 67 | */ |
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| 68 | public void setNodeAddress(short address) { |
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| 69 | header[1] = UByte.fromShort(address); |
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| 70 | } |
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| 71 | |||
| 72 | } |