feat: encapsulate timing information from which to get cursors

Author: metacosm

measure/src/main/java/net/laprun/sustainability/power/measure/OngoingPowerMeasure.java

@@ -158,7 +158,9 @@ public synchronized TimestampedMeasures getNthTimestampedMeasures(int n) {
         return new TimestampedMeasures(timestamps[n], result);
     }
 
-    public Cursor.PartialCursor getCursorOver(long timestamp, Duration duration) {
-        return Cursor.cursorOver(timestamps, timestamp, duration, startedAt, samplePeriod);
+    public Timing timingInfo() {
+        final var result = new long[timestamps.length];
+        System.arraycopy(timestamps, 0, result, 0, timestamps.length);
+        return new Timing(result, startedAt, samplePeriod);
     }
 }

measure/src/main/java/net/laprun/sustainability/power/measure/Timing.java

@@ -0,0 +1,9 @@
+package net.laprun.sustainability.power.measure;
+
+import java.time.Duration;
+
+public record Timing(long[] timestamps, long startedAt, long samplePeriod) {
+    public PartialCursor cursorOver(long timestamp, Duration duration) {
+        return Cursor.cursorOver(timestamps, timestamp, duration, startedAt, samplePeriod);
+    }
+}