Index: src/java/org/apache/lucene/store/RAMDirectory.java
===================================================================
--- src/java/org/apache/lucene/store/RAMDirectory.java	(revision 497169)
+++ src/java/org/apache/lucene/store/RAMDirectory.java	(working copy)
@@ -74,29 +74,7 @@
   
   private RAMDirectory(Directory dir, boolean closeDir) throws IOException {
     this();
-    final String[] files = dir.list();
-    byte[] buf = new byte[BufferedIndexOutput.BUFFER_SIZE];
-    for (int i = 0; i < files.length; i++) {
-      // make place on ram disk
-      IndexOutput os = createOutput(files[i]);
-      // read current file
-      IndexInput is = dir.openInput(files[i]);
-      // and copy to ram disk
-      long len = is.length();
-      long readCount = 0;
-      while (readCount < len) {
-        int toRead = readCount + BufferedIndexOutput.BUFFER_SIZE > len ? (int)(len - readCount) : BufferedIndexOutput.BUFFER_SIZE;
-        is.readBytes(buf, 0, toRead);
-        os.writeBytes(buf, toRead);
-        readCount += toRead;
-      }
-
-      // graceful cleanup
-      is.close();
-      os.close();
-    }
-    if(closeDir)
-      dir.close();
+    Directory.copy(dir, this, closeDir);
   }
 
   /**
Index: src/java/org/apache/lucene/store/Directory.java
===================================================================
--- src/java/org/apache/lucene/store/Directory.java	(revision 497169)
+++ src/java/org/apache/lucene/store/Directory.java	(working copy)
@@ -124,4 +124,39 @@
   public String getLockID() {
       return this.toString();
   }
+
+  /**
+   * Deeply copy content of a directory src to a directory dest.
+   * It is assumed the dest directory is empty.
+   *
+   * @param src source directory
+   * @param dest destination directory
+   * @param closeDirSrc if <code>true</code>, call {@link #close()} method on source directory
+   * @throws IOException
+   */
+  public static void copy(Directory src, Directory dest, boolean closeDirSrc) throws IOException {
+      final String[] files = src.list();
+      byte[] buf = new byte[BufferedIndexOutput.BUFFER_SIZE];
+      for (int i = 0; i < files.length; i++) {
+        // create file in dest directory
+        IndexOutput os = dest.createOutput(files[i]);
+        // read current file
+        IndexInput is = src.openInput(files[i]);
+        // and copy to dest directory
+        long len = is.length();
+        long readCount = 0;
+        while (readCount < len) {
+          int toRead = readCount + BufferedIndexOutput.BUFFER_SIZE > len ? (int)(len - readCount) : BufferedIndexOutput.BUFFER_SIZE;
+          is.readBytes(buf, 0, toRead);
+          os.writeBytes(buf, toRead);
+          readCount += toRead;
+        }
+
+        // graceful cleanup
+        is.close();
+        os.close();
+      }
+      if(closeDirSrc)
+        src.close();
+  }
 }