org.linkedin.util-core/src/main/java/org/linkedin/util/io/ram/RAMDirectory.java
public RAMEntry add(RAMEntry entry)
  {
    touch();
    _directoryContent.put(entry.name(), entry);
    return entry;
  }
public RAMEntry add(RAMEntry entry)
  {
    touch();
    _directoryContent.put(entry.name(), entry);
    return entry;
  }
Copy the entry in this directory with the provided name

@param entry
@return the touched entry