From 158c0e0ef40c16d9ae38a7fa70b10b893a80d7b3 Mon Sep 17 00:00:00 2001
From: Edoardo La Greca
Date: Thu, 7 Aug 2025 16:29:16 +0200
Subject: turn FIDInfo into PathInfo

---
 src/main/kotlin/PathInfo.kt | 62 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/main/kotlin/PathInfo.kt

(limited to 'src/main/kotlin/PathInfo.kt')

diff --git a/src/main/kotlin/PathInfo.kt b/src/main/kotlin/PathInfo.kt
new file mode 100644
index 0000000..c9ff29e
--- /dev/null
+++ b/src/main/kotlin/PathInfo.kt
@@ -0,0 +1,62 @@
+/**
+ * This class holds all info about paths, their FIDs, and their QIDs.
+ */
+class PathInfo() {
+    private val paths: MutableSet<Path> = mutableSetOf()
+
+    /**
+     * Information about a path. Each FID maps to one path but not all paths have FIDs (injective). On the other hand,
+     * one QID can be shared with different paths and FIDs.
+     *
+     * FIDs are optional because some R-messages only return QIDs for certain files (e.g. walk).
+     *
+     * @param path The path.
+     * @param fid The optional FID associated with the path.
+     * @param qid The QID associated with the path.
+     */
+    data class Path(val path: List<String>, val fid: UInt?, val qid: QID)
+
+    /**
+     * Add a path.
+     */
+    fun addPath(path: Path) {
+        this.paths.add(path)
+    }
+
+    /**
+     * Find the FID associated with a path.
+     *
+     * @param path The path to find the FID of.
+     * @return The FID if [path] has an associated FID, or null otherwise.
+     */
+    fun findFIDByPath(path: List<String>): UInt? {
+        return this.paths.find { x -> x.path == path }?.fid
+    }                                                                
+
+    /**
+     * Find the QID associated to a path.
+     *
+     * @param path The path to find the QID of.
+     * @return The QID if [path] could be found, or null otherwise.
+     */
+    fun findQIDByPath(path: List<String>): QID? {
+        return this.paths.find { x -> x.path == path }?.qid
+    }
+
+    /**
+     * Find the path associated to a FID.
+     *
+     * @param fid The FID to find the path of.
+     * @return The path if [fid] could be found, or null otherwise.
+     */
+    fun findPathByFID(fid: UInt): List<String>? {
+        return this.paths.find { x -> x.fid == fid }?.path
+    }
+
+    /**
+     * Retrieve all paths
+     */
+    fun getAllPaths(): Set<Path> {
+        return this.paths.toSet()
+    }
+}
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