HADOOP-18100: Change scope of inner classes in InodeTree to make them accessible outside package

Fixes #3950

Signed-off-by: Owen O'Malley <omalley@apache.org>

Cherry-picked from 3684c7f6 by Owen O'Malley

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/FsGetter.java

@@ -20,15 +20,17 @@ package org.apache.hadoop.fs.viewfs;
 import java.io.IOException;
 import java.net.URI;
 
-import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 
 /**
  * File system instance getter.
  */
-@Private
-class FsGetter {
+@InterfaceAudience.LimitedPrivate({"Common"})
+@InterfaceStability.Unstable
+public class FsGetter {
 
   /**
    * Gets new file system instance of given uri.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/InodeTree.java

@@ -74,7 +74,7 @@ abstract class InodeTree<T> {
   private final String homedirPrefix;
   private List<MountPoint<T>> mountPoints = new ArrayList<MountPoint<T>>();
 
-  static class MountPoint<T> {
+  public static class MountPoint<T> {
     String src;
     INodeLink<T> target;
 
@@ -82,6 +82,22 @@ abstract class InodeTree<T> {
       src = srcPath;
       target = mountLink;
     }
+
+    /**
+     * Returns the source of mount point.
+     * @return The source
+     */
+    public String getSource() {
+      return this.src;
+    }
+
+    /**
+     * Returns the target link.
+     * @return The target INode link
+     */
+    public INodeLink<T> getTarget() {
+      return this.target;
+    }
   }
 
   /**
@@ -242,7 +258,7 @@ abstract class InodeTree<T> {
    * For a merge, each target is checked to be dir when created but if target
    * is changed later it is then ignored (a dir with null entries)
    */
-  static class INodeLink<T> extends INode<T> {
+  public static class INodeLink<T> extends INode<T> {
     final URI[] targetDirLinkList;
     private T targetFileSystem;   // file system object created from the link.
     // Function to initialize file system. Only applicable for simple links
@@ -276,7 +292,7 @@ abstract class InodeTree<T> {
      * Get the target of the link. If a merge link then it returned
      * as "," separated URI list.
      */
-    Path getTargetLink() {
+    public Path getTargetLink() {
       StringBuilder result = new StringBuilder(targetDirLinkList[0].toString());
       // If merge link, use "," as separator between the merged URIs
       for (int i = 1; i < targetDirLinkList.length; ++i) {
@@ -770,7 +786,7 @@ abstract class InodeTree<T> {
     return res;
   }
 
-  List<MountPoint<T>> getMountPoints() {
+  public List<MountPoint<T>> getMountPoints() {
     return mountPoints;
   }