add getJavaSparkContext

Author: PangZhi

spark/src/main/java/io/ddf/spark/SparkDDFManager.java

@@ -5,12 +5,9 @@
 import io.ddf.DDF;
 import io.ddf.DDFManager;
 import io.ddf.content.Schema;
-import io.ddf.DDFManager.EngineType;
 import io.ddf.datasource.DataSourceDescriptor;
-import io.ddf.datasource.JDBCDataSourceCredentials;
 import io.ddf.datasource.JDBCDataSourceDescriptor;
 import io.ddf.exception.DDFException;
-import io.ddf.spark.content.SchemaHandler;
 import io.ddf.spark.datasource.SparkDataSourceManager;
 import io.ddf.spark.etl.DateParseUDF;
 import io.ddf.spark.etl.DateTimeExtractUDF;
@@ -21,18 +18,12 @@
 import org.apache.spark.SparkContext;
 import org.apache.spark.api.java.JavaRDD;
 import org.apache.spark.api.java.JavaSparkContext;
-import org.apache.spark.rdd.RDD;
-import org.apache.spark.sql.DataFrame;
-import org.apache.spark.sql.Row;
 import org.apache.spark.sql.hive.HiveContext;
 
 import java.io.File;
-import java.net.URISyntaxException;
 import java.security.SecureRandom;
 import java.util.*;
 
-//import shark.SharkEnv;
-//import shark.api.JavaSharkContext;
 
 /**
  * An Apache-Spark-based implementation of DDFManager
@@ -97,6 +88,10 @@ public SparkContext getSparkContext() {
     return mSparkContext;
   }
 
+  public JavaSparkContext getJavaSparkContext() {
+    return mJavaSparkContext;
+  }
+
   private void setSparkContext(SparkContext sparkContext) {
     this.mSparkContext = sparkContext;
   }