Convert Duration to java.time.Duration

airlift · Jul 3, 2023 · cbd7bea · cbd7bea
1 parent ee4ca0c
commit cbd7bea
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diff --git a/src/main/java/io/airlift/units/Duration.java b/src/main/java/io/airlift/units/Duration.java
@@ -24,6 +24,7 @@
 import java.util.regex.Pattern;
 
 import static io.airlift.units.Preconditions.checkArgument;
+import static java.lang.Math.floor;
 import static java.lang.String.format;
 import static java.util.Objects.requireNonNull;
 import static java.util.concurrent.TimeUnit.DAYS;
@@ -130,6 +131,28 @@ public Duration convertToMostSuccinctTimeUnit()
         return convertTo(unitToUse);
     }
 
+    public java.time.Duration toJavaTime()
+    {
+        long seconds;
+        long nanoAdjustment;
+        long secondsPerUnit = SECONDS.convert(1, unit);
+        long nanosPerUnit = NANOSECONDS.convert(1, unit);
+        if (secondsPerUnit > 1) {
+            seconds = (long) floor(value * secondsPerUnit);
+            nanoAdjustment = (long) floor((value - (double) seconds / secondsPerUnit) * nanosPerUnit);
+        }
+        else {
+            long unitsPerSecond = unit.convert(1, SECONDS);
+            seconds = (long) floor(value / unitsPerSecond);
+            nanoAdjustment = (long) floor((value - (double) seconds * unitsPerSecond) * nanosPerUnit);
+        }
+
+        if (seconds == Long.MAX_VALUE) {
+            nanoAdjustment = 0;
+        }
+        return java.time.Duration.ofSeconds(seconds, nanoAdjustment);
+    }
+
     @JsonValue
     @Override
     public String toString()

diff --git a/src/test/java/io/airlift/units/TestDuration.java b/src/test/java/io/airlift/units/TestDuration.java
@@ -105,6 +105,82 @@ public void testEquivalence()
                 .check();
     }
 
+    @Test
+    public void testToJavaTime()
+    {
+        assertThat(new Duration(0, DAYS).toJavaTime())
+                .isEqualTo(java.time.Duration.ZERO);
+
+        assertThat(new Duration(1, NANOSECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofNanos(1));
+        assertThat(new Duration(1, MICROSECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofNanos(1000));
+        assertThat(new Duration(1, MILLISECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofMillis(1));
+        assertThat(new Duration(1, SECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofSeconds(1));
+        assertThat(new Duration(1, MINUTES).toJavaTime())
+                .isEqualTo(java.time.Duration.ofMinutes(1));
+        assertThat(new Duration(1, HOURS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofHours(1));
+        assertThat(new Duration(1, DAYS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofDays(1));
+
+        assertThat(new Duration(42, NANOSECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofNanos(42));
+        assertThat(new Duration(42, MICROSECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofNanos(42000));
+        assertThat(new Duration(42, MILLISECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofMillis(42));
+        assertThat(new Duration(42, SECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofSeconds(42));
+        assertThat(new Duration(42, MINUTES).toJavaTime())
+                .isEqualTo(java.time.Duration.ofMinutes(42));
+        assertThat(new Duration(42, HOURS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofHours(42));
+        assertThat(new Duration(42, DAYS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofDays(42));
+
+        assertThat(new Duration(123456789, MILLISECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofMillis(123456789));
+        assertThat(new Duration(123456789, SECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofSeconds(123456789));
+        assertThat(new Duration(123456789, DAYS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofDays(123456789));
+
+        assertThat(new Duration(1234567890123456789d, MILLISECONDS).toJavaTime())
+                .isBetween(
+                        java.time.Duration.ofMillis(1234567890123456700L),
+                        java.time.Duration.ofMillis(1234567890123456800L));
+        assertThat(new Duration(1234567890123456789d, SECONDS).toJavaTime())
+                .isBetween(
+                        java.time.Duration.ofSeconds(1234567890123456700L),
+                        java.time.Duration.ofSeconds(1234567890123456800L));
+        assertThat(new Duration(1234567890123456789d, DAYS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofSeconds(Long.MAX_VALUE));
+
+        assertThat(new Duration(0.01, MILLISECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofNanos(10_000));
+        assertThat(new Duration(0.01, SECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofMillis(10));
+        assertThat(new Duration(0.01, DAYS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofSeconds(86400 / 100));
+
+        assertThat(new Duration(0.25, MILLISECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofNanos(250_000));
+        assertThat(new Duration(0.25, SECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofNanos(250_000_000));
+        assertThat(new Duration(0.25, DAYS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofSeconds(86400 / 4));
+
+        assertThat(new Duration(0.5, MILLISECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofNanos(500_000));
+        assertThat(new Duration(0.5, SECONDS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofNanos(500_000_000));
+        assertThat(new Duration(0.5, DAYS).toJavaTime())
+                .isEqualTo(java.time.Duration.ofSeconds(86400 / 2));
+    }
+
     private static List<Duration> generateTimeBucket(double seconds)
     {
         List<Duration> bucket = new ArrayList<>();