Port ReferenceTime interface to Kotlin

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/package-info.java

@@ -1,8 +0,0 @@
-// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
-//
-// SPDX-License-Identifier: Apache-2.0
-
-/**
- * Dijkstra-based WoT implementation using a flow network.
- */
-package org.pgpainless.wot.dijkstra;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/ReferenceTime.java

@@ -1,34 +0,0 @@
-// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
-//
-// SPDX-License-Identifier: Apache-2.0
-
-package org.pgpainless.wot.dijkstra.sq;
-
-import javax.annotation.Nonnull;
-import java.util.Date;
-
-public interface ReferenceTime {
-
-    @Nonnull Date getTimestamp();
-
-    static ReferenceTime now() {
-        final Date now = new Date();
-        return new ReferenceTime() {
-            @Override
-            @Nonnull
-            public Date getTimestamp() {
-                return now;
-            }
-        };
-    }
-
-    static ReferenceTime timestamp(@Nonnull Date timestamp) {
-        return new ReferenceTime() {
-            @Override
-            @Nonnull
-            public Date getTimestamp() {
-                return timestamp;
-            }
-        };
-    }
-}

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/package-info.java

@@ -1,8 +0,0 @@
-// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
-//
-// SPDX-License-Identifier: Apache-2.0
-
-/**
- * Web of Trust implementation.
- */
-package org.pgpainless.wot.dijkstra.sq;

wot-dijkstra/src/main/kotlin/org/pgpainless/wot/dijkstra/sq/ReferenceTime.kt

@@ -0,0 +1,31 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.wot.dijkstra.sq
+
+import java.util.*
+
+interface ReferenceTime {
+
+    val timestamp: Date
+
+    companion object {
+        @JvmStatic
+        fun now(): ReferenceTime {
+            val now = Date()
+            return object: ReferenceTime {
+                override val timestamp: Date
+                    get() = now
+            }
+        }
+
+        @JvmStatic
+        fun timestamp(stamp: Date): ReferenceTime {
+            return object: ReferenceTime {
+                override val timestamp: Date
+                    get() = stamp
+            }
+        }
+    }
+}