Merge pull request apache#406 from eklavya/master

Extending Java API coverage

Hi,

I have added three new methods to JavaRDD.

Please review and merge.

core/src/main/scala/org/apache/spark/api/java/JavaRDDLike.scala

@@ -134,20 +134,53 @@ trait JavaRDDLike[T, This <: JavaRDDLike[T, This]] extends Serializable {
   /**
    * Return a new RDD by applying a function to each partition of this RDD.
    */
+  def mapPartitions[U](f: FlatMapFunction[java.util.Iterator[T], U], preservesPartitioning: Boolean): JavaRDD[U] = {
+    def fn = (x: Iterator[T]) => asScalaIterator(f.apply(asJavaIterator(x)).iterator())
+    JavaRDD.fromRDD(rdd.mapPartitions(fn, preservesPartitioning)(f.elementType()))(f.elementType())
+  }
+
+  /**
+    * Return a new RDD by applying a function to each partition of this RDD.
+   */
   def mapPartitions(f: DoubleFlatMapFunction[java.util.Iterator[T]]): JavaDoubleRDD = {
     def fn = (x: Iterator[T]) => asScalaIterator(f.apply(asJavaIterator(x)).iterator())
     new JavaDoubleRDD(rdd.mapPartitions(fn).map((x: java.lang.Double) => x.doubleValue()))
   }
 
   /**
-   * Return a new RDD by applying a function to each partition of this RDD.
+    * Return a new RDD by applying a function to each partition of this RDD.
    */
   def mapPartitions[K2, V2](f: PairFlatMapFunction[java.util.Iterator[T], K2, V2]):
   JavaPairRDD[K2, V2] = {
     def fn = (x: Iterator[T]) => asScalaIterator(f.apply(asJavaIterator(x)).iterator())
     JavaPairRDD.fromRDD(rdd.mapPartitions(fn))(f.keyType(), f.valueType())
   }
 
+
+  /**
+   * Return a new RDD by applying a function to each partition of this RDD.
+   */
+  def mapPartitions(f: DoubleFlatMapFunction[java.util.Iterator[T]], preservesPartitioning: Boolean): JavaDoubleRDD = {
+    def fn = (x: Iterator[T]) => asScalaIterator(f.apply(asJavaIterator(x)).iterator())
+    new JavaDoubleRDD(rdd.mapPartitions(fn, preservesPartitioning).map((x: java.lang.Double) => x.doubleValue()))
+  }
+
+  /**
+   * Return a new RDD by applying a function to each partition of this RDD.
+   */
+  def mapPartitions[K2, V2](f: PairFlatMapFunction[java.util.Iterator[T], K2, V2], preservesPartitioning: Boolean):
+  JavaPairRDD[K2, V2] = {
+    def fn = (x: Iterator[T]) => asScalaIterator(f.apply(asJavaIterator(x)).iterator())
+    JavaPairRDD.fromRDD(rdd.mapPartitions(fn, preservesPartitioning))(f.keyType(), f.valueType())
+  }
+
+  /**
+   * Applies a function f to each partition of this RDD.
+   */
+  def foreachPartition(f: VoidFunction[java.util.Iterator[T]]) {
+    rdd.foreachPartition((x => f(asJavaIterator(x))))
+  }
+
   /**
    * Return an RDD created by coalescing all elements within each partition into an array.
    */
@@ -461,4 +494,9 @@ trait JavaRDDLike[T, This <: JavaRDDLike[T, This]] extends Serializable {
   def countApproxDistinct(relativeSD: Double = 0.05): Long = rdd.countApproxDistinct(relativeSD)
 
   def name(): String = rdd.name
+
+  /** Reset generator */
+  def setGenerator(_generator: String) = {
+    rdd.setGenerator(_generator)
+  }
 }