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1
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1 /* HashTree -- Tree in a Hashtable
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2
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3 Digital Image Library servlet components
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4
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5 Copyright (C) 2001, 2002 Robert Casties (robcast@mail.berlios.de)
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6
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7 This program is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2 of the License, or (at your
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10 option) any later version.
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11
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12 Please read license.txt for the full details. A copy of the GPL
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13 may be found at http://www.gnu.org/copyleft/lgpl.html
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 */
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20
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21 package digilib.auth;
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22
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23 import java.util.*;
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24
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25 public class HashTree {
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26
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88
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27 private HashMap table;
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1
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28 private String twigSep = "/";
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29 private String leafSep = ",";
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30
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31 public HashTree() {
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88
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32 table = new HashMap();
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1
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33 }
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34
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88
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35 public HashTree(HashMap t, String twig_separator, String leaf_separator) {
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1
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36 table = t;
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37 twigSep = twig_separator;
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38 leafSep = leaf_separator;
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39 optimizeTable();
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40 }
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41
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42 void optimizeTable() {
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43 }
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44
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45 List match(String branch) {
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46 String b = "";
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47 String m;
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48 LinkedList matches = new LinkedList();
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49
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50 // split branch
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51 StringTokenizer twig = new StringTokenizer(branch, twigSep);
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52 // walk branch and check with tree
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53 while (twig.hasMoreTokens()) {
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54 if (b.length() == 0) {
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55 b = twig.nextToken();
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56 } else {
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57 b += twigSep + twig.nextToken();
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58 }
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59 m = (String)table.get(b);
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60 //System.out.println("CHECK: "+b+" = "+m);
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61 if (m != null) {
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62 if (m.indexOf(leafSep) < 0) {
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63 // single leaf
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64 matches.add(m);
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65 } else {
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66 // split leaves
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67 StringTokenizer leaf = new StringTokenizer(m, leafSep);
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68 while (leaf.hasMoreTokens()) {
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69 matches.add(leaf.nextToken());
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70 }
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71 }
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72 }
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73 }
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74 if (matches.size() > 0) {
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75 return matches;
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76 } else {
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77 return null;
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78 }
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79 }
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80 }
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