comparison: src/main/java/de/uapcore/lightpit/PathPattern.java
src/main/java/de/uapcore/lightpit/PathPattern.java
- changeset 179
- 623c340058f3
- parent 178
- 88207b860cba
- child 180
- 009700915269
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| 178:88207b860cba | 179:623c340058f3 |
|---|---|
| 1 package de.uapcore.lightpit; | |
| 2 | |
| 3 import java.util.ArrayList; | |
| 4 import java.util.List; | |
| 5 | |
| 6 public final class PathPattern { | |
| 7 | |
| 8 private final List<String> nodePatterns; | |
| 9 private final boolean collection; | |
| 10 | |
| 11 /** | |
| 12 * Constructs a new path pattern. | |
| 13 * The special directories . and .. are disallowed in the pattern. | |
| 14 * | |
| 15 * @param pattern | |
| 16 */ | |
| 17 public PathPattern(String pattern) { | |
| 18 nodePatterns = parse(pattern); | |
| 19 collection = pattern.endsWith("/"); | |
| 20 } | |
| 21 | |
| 22 private List<String> parse(String pattern) { | |
| 23 | |
| 24 var nodes = new ArrayList<String>(); | |
| 25 var parts = pattern.split("/"); | |
| 26 | |
| 27 for (var part : parts) { | |
| 28 if (part.isBlank()) continue; | |
| 29 if (part.equals(".") || part.equals("..")) | |
| 30 throw new IllegalArgumentException("Path must not contain '.' or '..' nodes."); | |
| 31 nodes.add(part); | |
| 32 } | |
| 33 | |
| 34 return nodes; | |
| 35 } | |
| 36 | |
| 37 /** | |
| 38 * Matches a path against this pattern. | |
| 39 * The path must be canonical in the sense that no . or .. parts occur. | |
| 40 * | |
| 41 * @param path the path to match | |
| 42 * @return true if the path matches the pattern, false otherwise | |
| 43 */ | |
| 44 public boolean matches(String path) { | |
| 45 if (collection ^ path.endsWith("/")) | |
| 46 return false; | |
| 47 | |
| 48 var nodes = parse(path); | |
| 49 if (nodePatterns.size() != nodes.size()) | |
| 50 return false; | |
| 51 | |
| 52 for (int i = 0 ; i < nodePatterns.size() ; i++) { | |
| 53 var pattern = nodePatterns.get(i); | |
| 54 var node = nodes.get(i); | |
| 55 if (pattern.startsWith("$")) | |
| 56 continue; | |
| 57 if (!pattern.equals(node)) | |
| 58 return false; | |
| 59 } | |
| 60 | |
| 61 return true; | |
| 62 } | |
| 63 | |
| 64 /** | |
| 65 * Returns the path parameters found in the specified path using this pattern. | |
| 66 * The return value of this method is undefined, if the patter does not match. | |
| 67 * | |
| 68 * @param path the path | |
| 69 * @return the path parameters, if any, or an empty map | |
| 70 * @see #matches(String) | |
| 71 */ | |
| 72 public PathParameters obtainPathParameters(String path) { | |
| 73 var params = new PathParameters(); | |
| 74 | |
| 75 var nodes = parse(path); | |
| 76 | |
| 77 for (int i = 0 ; i < Math.min(nodes.size(), nodePatterns.size()) ; i++) { | |
| 78 var pattern = nodePatterns.get(i); | |
| 79 var node = nodes.get(i); | |
| 80 if (pattern.startsWith("$")) { | |
| 81 params.put(pattern.substring(1), node); | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 return params; | |
| 86 } | |
| 87 | |
| 88 @Override | |
| 89 public int hashCode() { | |
| 90 var str = new StringBuilder(); | |
| 91 for (var node : nodePatterns) { | |
| 92 if (node.startsWith("$")) { | |
| 93 str.append("/$"); | |
| 94 } else { | |
| 95 str.append('/'); | |
| 96 str.append(node); | |
| 97 } | |
| 98 } | |
| 99 if (collection) | |
| 100 str.append('/'); | |
| 101 | |
| 102 return str.toString().hashCode(); | |
| 103 } | |
| 104 | |
| 105 @Override | |
| 106 public boolean equals(Object obj) { | |
| 107 if (!obj.getClass().equals(PathPattern.class)) | |
| 108 return false; | |
| 109 | |
| 110 var other = (PathPattern) obj; | |
| 111 if (collection ^ other.collection || nodePatterns.size() != other.nodePatterns.size()) | |
| 112 return false; | |
| 113 | |
| 114 for (int i = 0 ; i < nodePatterns.size() ; i++) { | |
| 115 var left = nodePatterns.get(i); | |
| 116 var right = other.nodePatterns.get(i); | |
| 117 if (left.startsWith("$") && right.startsWith("$")) | |
| 118 continue; | |
| 119 if (!left.equals(right)) | |
| 120 return false; | |
| 121 } | |
| 122 | |
| 123 return true; | |
| 124 } | |
| 125 } |
