cdm/src/main/java/ucar/nc2/util/DiskCache.java
static public void setRootDirectory(String cacheDir) {
    if (!cacheDir.endsWith("/"))
      cacheDir = cacheDir + "/";
    root = StringUtil2.replace(cacheDir, '\\', "/"); // no nasty backslash

    makeRootDirectory();
  }
static public void setRootDirectory(String cacheDir) {
    if (!cacheDir.endsWith("/"))
      cacheDir = cacheDir + "/";
    root = StringUtil2.replace(cacheDir, '\\', "/"); // no nasty backslash

    makeRootDirectory();
  }
Set the cache root directory. Create it if it doesnt exist.

@param cacheDir the cache directory