Sending and Receiving Messages - TCP/IP Sockets in Java Practical Guide for Programmers - page 50

6
7

public ItemQuoteDecoderText() {

8

encoding = DEFAULT_ENCODING;

9

}

10
11

public ItemQuoteDecoderText(String encoding) {

12

this.encoding = encoding;

13

}

14
15

public ItemQuote decode(InputStream wire) throws IOException {

16 String itemNo, description, quant, price, flags;

17 byte[] space = " ".getBytes(encoding);

18 byte[] newline = "\n".getBytes(encoding);

19 itemNo = new String(Framer.nextToken(wire, space), encoding);

20 description = new String(Framer.nextToken(wire, newline), encoding);

21 quant = new String(Framer.nextToken(wire, space), encoding);

22

price = new String(Framer.nextToken(wire, space), encoding);

23

flags = new String(Framer.nextToken(wire, newline), encoding);

24

return new ItemQuote(Long.parseLong(itemNo), description,

25

Integer.parseInt(quant),

26

Integer.parseInt(price),

27

(flags.indexOf('d') != −1),

28

(flags.indexOf('s') != −1));

29

}

30
31

public ItemQuote decode(DatagramPacket p) throws IOException {

32

ByteArrayInputStream payload =

33

new ByteArrayInputStream(p.getData(), p.getOffset(), p.getLength());

34

return decode(payload);

35

}

36 }

ItemQuoteDecoderText.java

1. Variables and constructors: lines 5-13

Encoding: line 5
The encoding used in the decoder must be the same as in the encoder!
Constructors: lines 7-13
If no encoding is given at construction time, the default defined in ItemQuoteDecoder-
TextConst is used.
2. Stream decode() : lines 15-29

Convert delimiters: lines 17-18
We get the encoded form of the delimiters ahead of time, for eciency.