Index: /home/dnaber/workspace/LuceneSVN/src/java/org/apache/lucene/store/RAMDirectory.java
===================================================================
--- /home/dnaber/workspace/LuceneSVN/src/java/org/apache/lucene/store/RAMDirectory.java	(Revision 171375)
+++ /home/dnaber/workspace/LuceneSVN/src/java/org/apache/lucene/store/RAMDirectory.java	(Arbeitskopie)
@@ -30,7 +30,7 @@
  *
  * @version $Id$
  */
-public final class RAMDirectory extends Directory {
+public final class RAMDirectory extends Directory implements Cloneable {
   Hashtable files = new Hashtable();
 
   /** Constructs an empty {@link Directory}. */
@@ -191,4 +191,17 @@
   /** Closes the store to future operations. */
   public final void close() {
   }
+  
+  public Object clone() {
+    RAMDirectory clone = new RAMDirectory();
+    // *deep* copy files.
+    for (java.util.Iterator it = files.entrySet().iterator(); it.hasNext();) {
+      java.util.Map.Entry entry = (java.util.Map.Entry) it.next();
+      String name = (String) entry.getKey();
+      RAMFile file = (RAMFile) entry.getValue();
+      clone.files.put(new String(name), file.clone());
+    }
+    return clone;
+  }
+
 }
Index: /home/dnaber/workspace/LuceneSVN/src/java/org/apache/lucene/store/RAMFile.java
===================================================================
--- /home/dnaber/workspace/LuceneSVN/src/java/org/apache/lucene/store/RAMFile.java	(Revision 171375)
+++ /home/dnaber/workspace/LuceneSVN/src/java/org/apache/lucene/store/RAMFile.java	(Arbeitskopie)
@@ -18,8 +18,17 @@
 
 import java.util.Vector;
 
-class RAMFile {
+class RAMFile implements Cloneable {
   Vector buffers = new Vector();
   long length;
   long lastModified = System.currentTimeMillis();
+  
+  public Object clone() {
+    RAMFile clone = new RAMFile();
+    clone.buffers = (Vector)buffers.clone();
+    clone.length = length;
+    clone.lastModified = lastModified;
+    return clone;
+  }
+
 }