Implement Root, Roots

wot-dijkstra/src/main/kotlin/org/pgpainless/wot/network/Root.kt

@@ -0,0 +1,12 @@
+// SPDX-FileCopyrightText: 2023 Heiko Schaefer <heiko@schaefer.name>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.wot.network
+
+data class Root(val fingerprint: Fingerprint, val amount: Int) {
+
+    constructor(fingerprint: Fingerprint) : this(fingerprint, 120)
+
+    override fun toString() = "$fingerprint [$amount]"
+}

wot-dijkstra/src/main/kotlin/org/pgpainless/wot/network/Roots.kt

@@ -0,0 +1,48 @@
+// SPDX-FileCopyrightText: 2023 Heiko Schaefer <heiko@schaefer.name>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.wot.network
+
+/**
+ * A set of `Root`s (that can be used as the basis for authentication lookups).
+ */
+class Roots {
+
+    // Map for efficient lookup by Fingerprint
+    private val roots: Map<Fingerprint, Root>
+
+    constructor(roots: List<Root>) {
+        this.roots = roots.associateBy { it.fingerprint }
+    }
+
+    constructor() : this(listOf())
+
+    /**
+     * Returns the specified root.
+     */
+    fun get(fpr: Fingerprint): Root? = roots[fpr]
+
+    /**
+     * Check if `fpr` is contained in this set of roots.
+     */
+    fun isRoot(fpr: Fingerprint) = roots.containsKey(fpr)
+
+    /**
+     * The set of fingerprints of all roots.
+     */
+    fun fingerprints() = roots.keys
+
+    /**
+     * A collection of all roots.
+     */
+    fun roots() = roots.values
+
+    /**
+     * The number of roots
+     */
+    fun size() = roots.size
+
+    override fun toString() = roots.keys.sorted().joinToString(", ")
+
+}