213     private class StringOption extends Option<String> {
 214 
 215         StringOption(Character s, String l, String v, String d) {
 216             super(s, l, v, d);
 217         }
 218 
 219         @Override
 220         public String parseFromString(String arg) {
 221             return arg;
 222         }
 223     }
 224 
 225     private class LongOption extends Option<Long> {
 226 
 227         LongOption(Character s, String l, long v, String d) {
 228             super(s, l, v, d);
 229         }
 230 
 231         @Override
 232         public Long parseFromString(String arg) {
 233             return new Long(arg);
 234         }
 235     }
 236 
 237     private class IntOption extends Option<Integer> {
 238 
 239         IntOption(Character s, String l, int v, String d) {
 240             super(s, l, v, d);
 241         }
 242 
 243         @Override
 244         public Integer parseFromString(String arg) {
 245             return new Integer(arg);
 246         }
 247     }
 248 
 249     private class BooleanOption extends Option<Boolean> {
 250 
 251         BooleanOption(Character s, String l, boolean v, String d) {
 252             super(s, l, v, d);
 253         }
 254 
 255         @Override
 256         public boolean isFlag() {
 257             return true;
 258         }
 259 
 260         @Override
 261         public Boolean parseFromString(String arg) {
 262             //null and empty value is considered true, as option is flag and value could be absent
 263             return arg == null || "".equals(arg) || "1".equalsIgnoreCase(arg) || "true".equalsIgnoreCase(arg);
 264         }
 265     }

 213     private class StringOption extends Option<String> {
 214 
 215         StringOption(Character s, String l, String v, String d) {
 216             super(s, l, v, d);
 217         }
 218 
 219         @Override
 220         public String parseFromString(String arg) {
 221             return arg;
 222         }
 223     }
 224 
 225     private class LongOption extends Option<Long> {
 226 
 227         LongOption(Character s, String l, long v, String d) {
 228             super(s, l, v, d);
 229         }
 230 
 231         @Override
 232         public Long parseFromString(String arg) {
 233             return Long.valueOf(arg);
 234         }
 235     }
 236 
 237     private class IntOption extends Option<Integer> {
 238 
 239         IntOption(Character s, String l, int v, String d) {
 240             super(s, l, v, d);
 241         }
 242 
 243         @Override
 244         public Integer parseFromString(String arg) {
 245             return Integer.valueOf(arg);
 246         }
 247     }
 248 
 249     private class BooleanOption extends Option<Boolean> {
 250 
 251         BooleanOption(Character s, String l, boolean v, String d) {
 252             super(s, l, v, d);
 253         }
 254 
 255         @Override
 256         public boolean isFlag() {
 257             return true;
 258         }
 259 
 260         @Override
 261         public Boolean parseFromString(String arg) {
 262             //null and empty value is considered true, as option is flag and value could be absent
 263             return arg == null || "".equals(arg) || "1".equalsIgnoreCase(arg) || "true".equalsIgnoreCase(arg);
 264         }
 265     }