211     public abstract long getSpace(File f, int t);
 212 
 213     /* -- Basic infrastructure -- */
 214 
 215     /**
 216      * Compare two abstract pathnames lexicographically.
 217      */
 218     public abstract int compare(File f1, File f2);
 219 
 220     /**
 221      * Compute the hash code of an abstract pathname.
 222      */
 223     public abstract int hashCode(File f);
 224 
 225     // Flags for enabling/disabling performance optimizations for file
 226     // name canonicalization
 227     static boolean useCanonCaches      = true;
 228     static boolean useCanonPrefixCache = true;
 229 
 230     private static boolean getBooleanProperty(String prop, boolean defaultVal) {
 231         String val = System.getProperty(prop);
 232         if (val == null) return defaultVal;
 233         if (val.equalsIgnoreCase("true")) {
 234             return true;
 235         } else {
 236             return false;
 237         }
 238     }
 239 
 240     static {
 241         useCanonCaches      = getBooleanProperty("sun.io.useCanonCaches",
 242                                                  useCanonCaches);
 243         useCanonPrefixCache = getBooleanProperty("sun.io.useCanonPrefixCache",
 244                                                  useCanonPrefixCache);
 245     }
 246 }

 211     public abstract long getSpace(File f, int t);
 212 
 213     /* -- Basic infrastructure -- */
 214 
 215     /**
 216      * Compare two abstract pathnames lexicographically.
 217      */
 218     public abstract int compare(File f1, File f2);
 219 
 220     /**
 221      * Compute the hash code of an abstract pathname.
 222      */
 223     public abstract int hashCode(File f);
 224 
 225     // Flags for enabling/disabling performance optimizations for file
 226     // name canonicalization
 227     static boolean useCanonCaches      = true;
 228     static boolean useCanonPrefixCache = true;
 229 
 230     private static boolean getBooleanProperty(String prop, boolean defaultVal) {
 231         return Boolean.parseBoolean(System.getProperty(prop,
 232                 String.valueOf(defaultVal)));





 233     }
 234 
 235     static {
 236         useCanonCaches      = getBooleanProperty("sun.io.useCanonCaches",
 237                                                  useCanonCaches);
 238         useCanonPrefixCache = getBooleanProperty("sun.io.useCanonPrefixCache",
 239                                                  useCanonPrefixCache);
 240     }
 241 }