1 files changed, 62 insertions, 0 deletions
diff --git a/formats/hocon/src/main/kotlin/kotlinx/serialization/hocon/internal/HoconDuration.kt b/formats/hocon/src/main/kotlin/kotlinx/serialization/hocon/internal/HoconDuration.kt
new file mode 100644
index 00000000..5fcf443b
--- /dev/null
+++ b/formats/hocon/src/main/kotlin/kotlinx/serialization/hocon/internal/HoconDuration.kt
@@ -0,0 +1,62 @@
+package kotlinx.serialization.hocon.internal
+
+import com.typesafe.config.*
+import java.time.Duration as JDuration
+import kotlin.time.Duration
+import kotlinx.serialization.*
+import kotlinx.serialization.builtins.serializer
+import kotlinx.serialization.descriptors.SerialDescriptor
+
+/**
+ * Encode [Duration] objects using time unit short names: d, h, m, s, ms, us, ns.
+ * Example:
+ *     120.seconds -> 2 m;
+ *     121.seconds -> 121 s;
+ *     120.minutes -> 2 h;
+ *     122.minutes -> 122 m;
+ *     24.hours -> 1 d.
+ * Encoding uses the largest time unit.
+ * All restrictions on the maximum and minimum duration are specified in [Duration].
+ * @return encoded value
+ */
+internal fun encodeDuration(value: Duration): String = value.toComponents { seconds, nanoseconds ->
+    when {
+        nanoseconds == 0 -> {
+            if (seconds % 60 == 0L) { // minutes
+                if (seconds % 3600 == 0L) { // hours
+                    if (seconds % 86400 == 0L) { // days
+                        "${seconds / 86400} d"
+                    } else {
+                        "${seconds / 3600} h"
+                    }
+                } else {
+                    "${seconds / 60} m"
+                }
+            } else {
+                "$seconds s"
+            }
+        }
+        nanoseconds % 1_000_000 == 0 -> "${seconds * 1_000 + nanoseconds / 1_000_000} ms"
+        nanoseconds % 1_000 == 0 -> "${seconds * 1_000_000 + nanoseconds / 1_000} us"
+        else -> "${value.inWholeNanoseconds} ns"
+    }
+}
+
+/**
+ * Decode [JDuration] from [Config].
+ * See https://github.com/lightbend/config/blob/main/HOCON.md#duration-format
+ *
+ * @param path in config
+ */
+@SuppressAnimalSniffer
+internal fun Config.decodeJavaDuration(path: String): JDuration = try {
+    getDuration(path)
+} catch (e: ConfigException) {
+    throw SerializationException("Value at $path cannot be read as Duration because it is not a valid HOCON duration value", e)
+}
+
+/**
+ * Returns `true` if this descriptor is equals to descriptor in [kotlinx.serialization.internal.DurationSerializer].
+ */
+internal val SerialDescriptor.isDuration: Boolean
+    get() = this == Duration.serializer().descriptor