Add named methods to Duration in parallel to symbolic methods for Jav…

…a-friendliness. Also add unit tests for Duration, in Scala and Java.

streaming/src/main/scala/org/apache/spark/streaming/Duration.scala

@@ -37,6 +37,25 @@ case class Duration (private val millis: Long) {
 
   def / (that: Duration): Double = millis.toDouble / that.millis.toDouble
 
+  // Java-friendlier versions of the above:
+
+  def less(that: Duration): Boolean = this.<(that)
+
+  def lessEq(that: Duration): Boolean = this.<=(that)
+
+  def greater(that: Duration): Boolean = this.>(that)
+
+  def greaterEq(that: Duration): Boolean = this.>=(that)
+
+  def plus(that: Duration): Duration = this.+(that)
+
+  def minus(that: Duration): Duration = this.-(that)
+
+  def times(times: Int): Duration = this.*(times)
+
+  def div(that: Duration): Double = this./(that)
+
+
   def isMultipleOf(that: Duration): Boolean =
     (this.millis % that.millis == 0)
 

streaming/src/test/java/org/apache/spark/streaming/JavaDurationSuite.java

@@ -0,0 +1,69 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+package org.apache.spark.streaming;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class JavaDurationSuite {
+
+  // Just testing the methods that are specially exposed for Java.
+  // This does not repeat all tests found in the Scala suite.
+
+  @Test
+  public void testLess() {
+    Assert.assertTrue(new Duration(999).less(new Duration(1000)));
+  }
+
+  @Test
+  public void testLessEq() {
+    Assert.assertTrue(new Duration(1000).lessEq(new Duration(1000)));
+  }
+
+  @Test
+  public void testGreater() {
+    Assert.assertTrue(new Duration(1000).greater(new Duration(999)));
+  }
+
+  @Test
+  public void testGreaterEq() {
+    Assert.assertTrue(new Duration(1000).greaterEq(new Duration(1000)));
+  }
+
+  @Test
+  public void testPlus() {
+    Assert.assertEquals(new Duration(1100), new Duration(1000).plus(new Duration(100)));
+  }
+
+  @Test
+  public void testMinus() {
+    Assert.assertEquals(new Duration(900), new Duration(1000).minus(new Duration(100)));
+  }
+
+  @Test
+  public void testTimes() {
+    Assert.assertEquals(new Duration(200), new Duration(100).times(2));
+  }
+
+  @Test
+  public void testDiv() {
+    Assert.assertEquals(200.0, new Duration(1000).div(new Duration(5)), 1.0e-12);
+  }
+
+}

streaming/src/test/scala/org/apache/spark/streaming/DurationSuite.scala

@@ -0,0 +1,97 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.streaming
+
+class DurationSuite extends TestSuiteBase {
+
+  test("less") {
+    assert(new Duration(999) < new Duration(1000))
+    assert(new Duration(0) < new Duration(1))
+    assert(!(new Duration(1000) < new Duration(999)))
+    assert(!(new Duration(1000) < new Duration(1000)))
+  }
+
+  test("lessEq") {
+    assert(new Duration(999) <= new Duration(1000))
+    assert(new Duration(0) <= new Duration(1))
+    assert(!(new Duration(1000) <= new Duration(999)))
+    assert(new Duration(1000) <= new Duration(1000))
+  }
+
+  test("greater") {
+    assert(!(new Duration(999) > new Duration(1000)))
+    assert(!(new Duration(0) > new Duration(1)))
+    assert(new Duration(1000) > new Duration(999))
+    assert(!(new Duration(1000) > new Duration(1000)))
+  }
+
+  test("greaterEq") {
+    assert(!(new Duration(999) >= new Duration(1000)))
+    assert(!(new Duration(0) >= new Duration(1)))
+    assert(new Duration(1000) >= new Duration(999))
+    assert(new Duration(1000) >= new Duration(1000))
+  }
+
+  test("plus") {
+    assert((new Duration(1000) + new Duration(100)) == new Duration(1100))
+    assert((new Duration(1000) + new Duration(0)) == new Duration(1000))
+  }
+
+  test("minus") {
+    assert((new Duration(1000) - new Duration(100)) == new Duration(900))
+    assert((new Duration(1000) - new Duration(0)) == new Duration(1000))
+  }
+
+  test("times") {
+    assert((new Duration(100) * 2) == new Duration(200))
+    assert((new Duration(100) * 1) == new Duration(100))
+    assert((new Duration(100) * 0) == new Duration(0))
+  }
+
+  test("div") {
+    assert((new Duration(1000) / new Duration(5)) == 200.0)
+    assert((new Duration(1000) / new Duration(1)) == 1000.0)
+    assert((new Duration(1000) / new Duration(1000)) == 1.0)
+    assert((new Duration(1000) / new Duration(2000)) == 0.5)
+  }
+
+  test("isMultipleOf") {
+    assert(new Duration(1000).isMultipleOf(new Duration(5)))
+    assert(new Duration(1000).isMultipleOf(new Duration(1000)))
+    assert(new Duration(1000).isMultipleOf(new Duration(1)))
+    assert(!new Duration(1000).isMultipleOf(new Duration(6)))
+  }
+
+  test("min") {
+    assert(new Duration(999).min(new Duration(1000)) == new Duration(999))
+    assert(new Duration(1000).min(new Duration(999)) == new Duration(999))
+    assert(new Duration(1000).min(new Duration(1000)) == new Duration(1000))
+  }
+
+  test("max") {
+    assert(new Duration(999).max(new Duration(1000)) == new Duration(1000))
+    assert(new Duration(1000).max(new Duration(999)) == new Duration(1000))
+    assert(new Duration(1000).max(new Duration(1000)) == new Duration(1000))
+  }
+
+  test("isZero") {
+    assert(new Duration(0).isZero)
+    assert(!(new Duration(1).isZero))
+  }
+
+}