src/main/java/de/uapcore/lightpit/PathPattern.java

Mon, 21 Dec 2020 18:29:34 +0100

author
Mike Becker <universe@uap-core.de>
date
Mon, 21 Dec 2020 18:29:34 +0100
changeset 167
3f30adba1c63
parent 130
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permissions
-rw-r--r--

major refactoring of DAO architecture - also fixes #114

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1 package de.uapcore.lightpit;
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2
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3 import java.util.ArrayList;
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4 import java.util.List;
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5
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6 public final class PathPattern {
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7
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8 private final List<String> nodePatterns;
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9 private final boolean collection;
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10
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11 /**
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12 * Constructs a new path pattern.
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13 * The special directories . and .. are disallowed in the pattern.
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14 *
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15 * @param pattern
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16 */
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17 public PathPattern(String pattern) {
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18 nodePatterns = parse(pattern);
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19 collection = pattern.endsWith("/");
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20 }
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21
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22 private List<String> parse(String pattern) {
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23
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24 var nodes = new ArrayList<String>();
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25 var parts = pattern.split("/");
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26
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27 for (var part : parts) {
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28 if (part.isBlank()) continue;
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29 if (part.equals(".") || part.equals(".."))
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30 throw new IllegalArgumentException("Path must not contain '.' or '..' nodes.");
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31 nodes.add(part);
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32 }
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33
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34 return nodes;
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35 }
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36
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37 /**
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38 * Matches a path against this pattern.
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39 * The path must be canonical in the sense that no . or .. parts occur.
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40 *
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41 * @param path the path to match
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42 * @return true if the path matches the pattern, false otherwise
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43 */
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44 public boolean matches(String path) {
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45 if (collection ^ path.endsWith("/"))
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46 return false;
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47
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48 var nodes = parse(path);
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49 if (nodePatterns.size() != nodes.size())
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50 return false;
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51
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52 for (int i = 0 ; i < nodePatterns.size() ; i++) {
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53 var pattern = nodePatterns.get(i);
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54 var node = nodes.get(i);
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55 if (pattern.startsWith("$"))
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56 continue;
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57 if (!pattern.equals(node))
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58 return false;
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59 }
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60
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61 return true;
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62 }
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63
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64 /**
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65 * Returns the path parameters found in the specified path using this pattern.
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66 * The return value of this method is undefined, if the patter does not match.
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67 *
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68 * @param path the path
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69 * @return the path parameters, if any, or an empty map
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70 * @see #matches(String)
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71 */
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72 public PathParameters obtainPathParameters(String path) {
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73 var params = new PathParameters();
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74
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75 var nodes = parse(path);
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76
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77 for (int i = 0 ; i < Math.min(nodes.size(), nodePatterns.size()) ; i++) {
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78 var pattern = nodePatterns.get(i);
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79 var node = nodes.get(i);
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80 if (pattern.startsWith("$")) {
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81 params.put(pattern.substring(1), node);
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82 }
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83 }
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84
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85 return params;
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86 }
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87
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88 @Override
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89 public int hashCode() {
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90 var str = new StringBuilder();
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91 for (var node : nodePatterns) {
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92 if (node.startsWith("$")) {
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93 str.append("/$");
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94 } else {
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95 str.append('/');
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96 str.append(node);
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97 }
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98 }
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99 if (collection)
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100 str.append('/');
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101
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102 return str.toString().hashCode();
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103 }
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104
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105 @Override
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106 public boolean equals(Object obj) {
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107 if (!obj.getClass().equals(PathPattern.class))
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108 return false;
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109
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110 var other = (PathPattern) obj;
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111 if (collection ^ other.collection || nodePatterns.size() != other.nodePatterns.size())
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112 return false;
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113
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114 for (int i = 0 ; i < nodePatterns.size() ; i++) {
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115 var left = nodePatterns.get(i);
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116 var right = other.nodePatterns.get(i);
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117 if (left.startsWith("$") && right.startsWith("$"))
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118 continue;
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119 if (!left.equals(right))
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120 return false;
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121 }
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122
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123 return true;
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124 }
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125 }

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