Cron timer api (#17)

minevnlib-master/src/main/java/net/minevn/libs/CronTimer.kt

@@ -0,0 +1,24 @@
+package net.minevn.libs
+
+import java.time.ZonedDateTime
+
+@Suppress("unused", "MemberVisibilityCanBePrivate")
+class CronTimer(val expression: String) {
+    var nextSchedule = parseNextSchedule(); private set
+
+    fun parseNextSchedule(time: ZonedDateTime) = getNextSchedule(expression, time)
+
+    fun parseNextSchedule() = parseNextSchedule(ZonedDateTime.now())
+
+    fun update() {
+        nextSchedule = parseNextSchedule()
+    }
+
+    fun isTime(): Boolean {
+        if (ZonedDateTime.now() >= nextSchedule) {
+            update()
+            return true
+        }
+        return false
+    }
+}