1 | /*
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2 | * module: pip/java/packing -- Strategy objects for converting
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3 | * Java objects to and from stored data.
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4 | *
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5 | * Copyright (C) 1997 Pharos IP Pty Ltd
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6 | * $Id: NativeStringPacking.java 10737 2005-10-19 03:06:40Z kjdon $
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7 | *
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8 | * This program is free software; you can redistribute it and/or modify
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9 | * it under the terms of the GNU General Public License as published by
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10 | * the Free Software Foundation; either version 2 of the License, or
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11 | * (at your option) any later version.
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12 | *
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13 | * This program is distributed in the hope that it will be useful,
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 | * GNU General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU General Public License
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19 | * along with this program; if not, write to the Free Software
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20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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21 | */
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22 |
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23 | package au.com.pharos.packing;
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24 |
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25 | /** Convert an array of bytes in a Java string without using String
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26 | * encodings, just using expanding 8-bit bytes to 16-bit chars.
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27 | *
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28 | * <P>This will only work for ASCII characters, of course, but for
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29 | * moving bulk data around it is considerably faster than using
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30 | * UTF-8 encoding strategies. Naively compressing Unicode into
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31 | * 8-bit characters in this manner is deprecated in JDK1.1 to
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32 | * help ensure that programs are Unicode-safe.
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33 | *
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34 | * @author Martin Pool
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35 | * @version $Revision: 10737 $
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36 | *
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37 | * @see au.com.pharos.packing.Packing
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38 | * @see au.com.pharos.packing.StringPacking
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39 | */
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40 | public class NativeStringPacking extends Packing
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41 | {
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42 | /** Convert an object to an ASCII String representation.
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43 | *
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44 | * @return null if obj is null; obj is obj is already a
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45 | * byte[]; otherwise an native 8-bite encoded version of
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46 | * obj.toString().
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47 | **/
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48 | public byte[] toBytes(final Object obj)
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49 | {
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50 | String str;
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51 | if (obj == null)
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52 | return null;
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53 | else if (obj instanceof byte[])
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54 | return (byte[]) obj;
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55 | else if (obj instanceof String)
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56 | str = (String) obj;
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57 | else
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58 | str = obj.toString();
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59 |
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60 | int len = str.length();
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61 | byte[] rawArray = new byte[len];
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62 | str.getBytes(0, len, rawArray, 0);
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63 | return rawArray;
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64 | }
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65 |
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66 | /** Convert an array of bytes into a String
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67 | *
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68 | * @param raw the raw data to be decoded.
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69 | *
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70 | * @return null if <em>raw</em> is null; otherwise a string with the low
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71 | * 8 bits of each character taken from the corresponding byte in
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72 | * <em>raw</em>.
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73 | **/
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74 | public Object fromBytes(final byte[] raw)
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75 | {
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76 | if (raw == null)
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77 | return null;
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78 | else
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79 | return new String(raw, 0);
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80 | }
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81 | }
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82 |
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