public static void main(String[] args) {
StringReader r = new StringReader(" --1234,");
ShortTermMemoryReader reader = new ShortTermMemoryReader(r);
IntegerReadService service = new IntegerReadService();
try {
Integer i = service.read(reader);
System.out.println(i);
} catch (Exception e) {
System.out.println(((RowColumnReaderException) e).getColumn());
e.printStackTrace();
}
}
public Double read(ShortTermMemoryReader reader) throws RowColumnReaderException {
try {
IntegerReadService.removeSpaces(reader);
char c = (char) reader.read();
if (Character.isDigit(c) || c == '-' || c == '+') {
StringBuilder sb = new StringBuilder();
sb.append(c);
IntegerReadService.readDigitStar(reader, sb);
c = (char) reader.read();
if (c == '.') {
sb.append(c);
IntegerReadService.readDigitStar(reader, sb);
c = (char) reader.read();
}
if (c == 'e' || c == 'E') {
sb.append(c);
c = (char) reader.read();
if (c == '-' || c == '+') {
sb.append(c);
} else {
IntegerReadService.back(c, reader);
}
IntegerReadService.readDigitStar(reader, sb);
} else {
IntegerReadService.back(c, reader);
}
return Double.parseDouble(sb.toString());
}
throw new Exception("Unexpected symbol " + c);
} catch (Exception e) {
throw reader.getException("Double Parser Error " + e.getMessage());
}
}