HADOOP-7301. FSDataInputStream should expose a getWrappedStream method. Contributed by Jonathan Hsieh

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1124406 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -161,6 +161,9 @@ Trunk (unreleased changes)
     HADOOP-7286. Refactor the du/dus/df commands to conform to new FsCommand
     class. (Daryn Sharp via todd)
 
+    HADOOP-7301. FSDataInputStream should expose a getWrappedStream method.
+    (Jonathan Hsieh via eli)
+
   OPTIMIZATIONS
 
   BUG FIXES

src/java/org/apache/hadoop/fs/FSDataInputStream.java

@@ -64,4 +64,9 @@ public class FSDataInputStream extends DataInputStream
   public boolean seekToNewSource(long targetPos) throws IOException {
     return ((Seekable)in).seekToNewSource(targetPos); 
   }
+  
+  // Returns the underlying input stream. This is used by unit tests.
+  public InputStream getWrappedStream() {
+    return in;
+  }
 }

src/test/core/org/apache/hadoop/fs/FSMainOperationsBaseTest.java

@@ -20,6 +20,7 @@ package org.apache.hadoop.fs;
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.io.InputStream;
 
 
 
@@ -1044,6 +1045,16 @@ public abstract class FSMainOperationsBaseTest  {
   }
 
   
+  @Test
+  public void testGetWrappedInputStream() throws IOException {
+    Path src = getTestRootPath(fSys, "test/hadoop/file");
+    createFile(src);
+    FSDataInputStream in = fSys.open(src);
+    InputStream is = in.getWrappedStream();
+    in.close();
+    Assert.assertNotNull(is);  
+  }
+  
   protected void createFile(Path path) throws IOException {
     FileSystemTestHelper.createFile(fSys, path);
   }