1 files changed, 37 insertions, 0 deletions
diff --git a/core/src/main/scala/org/apache/spark/api/java/function/DoubleFlatMapFunction.java b/core/src/main/scala/org/apache/spark/api/java/function/DoubleFlatMapFunction.java
new file mode 100644
index 0000000000..4830067f7a
--- /dev/null
+++ b/core/src/main/scala/org/apache/spark/api/java/function/DoubleFlatMapFunction.java
@@ -0,0 +1,37 @@
+/*
+ * 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.api.java.function;
+
+
+import scala.runtime.AbstractFunction1;
+
+import java.io.Serializable;
+
+/**
+ * A function that returns zero or more records of type Double from each input record.
+ */
+// DoubleFlatMapFunction does not extend FlatMapFunction because flatMap is
+// overloaded for both FlatMapFunction and DoubleFlatMapFunction.
+public abstract class DoubleFlatMapFunction<T> extends AbstractFunction1<T, Iterable<Double>>
+  implements Serializable {
+
+  public abstract Iterable<Double> call(T t);
+
+  @Override
+  public final Iterable<Double> apply(T t) { return call(t); }
+}