com.oopreserch.web
Class IsDouble

java.lang.Object
  |
  +--com.oopreserch.web.IsDouble

All Implemented Interfaces:

FormValueVerifier

public class IsDouble

extends java.lang.Object

implements FormValueVerifier

Implementation of FormValueVerifier interface. Returns true if valid as positive double.

This class sees if the given String can be parsed to double or not. But, even if it can be parsed to double, the String which starts with 0 (zero) will be treated as invalid, unless it starts with 0. (zero followed by period). And the String which ends with . (period) will be treated as invalid, even if it can be parsed to double. In addition, while the String which starts with . (period) can be parsed to double, it will also be treated as invalid. For example:

String	Result
10	true
010	false
0	true
0.1	true
.1	false
0.	false
1.0	true
1.	false

Please note that all the Strings listed in the above table can be parsed to double. But, the valid String should look well also for human beings.

Author:

Jun Inamori

Constructor Summary

IsDouble()

Method Summary

boolean

isValidString(java.lang.String str) Returns true if the given String is valid as positive double.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IsDouble

public IsDouble()

Method Detail

isValidString

public boolean isValidString(java.lang.String str)

Returns true if the given String is valid as positive double.

Specified by:

isValidString in interface FormValueVerifier

Parameters:

str - String to be tested.

Returns:

true if the given String is valid as positive double.