Java 类com.beust.jcommander.IParameterValidator 实例源码

private IParameterValidator or(IParameterValidator... validators)
{
    return (name, value) -> {
        boolean isValid = false;
        List<ParameterException> exceptions = new ArrayList<>();
        for (int i = 0; i < validators.length && !isValid; i++)
        {
            try
            {
                validators[i].validate(name, value);
                isValid = true;
            }
            catch (ParameterException e)
            {
                exceptions.add(e);
            }
        }

        if (!isValid)
        {
            StringBuilder exceptionMessage = new StringBuilder();
            for (ParameterException exception : exceptions)
            {
                if (exceptionMessage.length() != 0)
                {
                    exceptionMessage.append(" or ");
                }
                exceptionMessage.append(exception.getMessage());
            }
            throw new ParameterException(exceptionMessage.toString());
        }
    };
}

private <T> T getProperty(String name, T defaultValue, IParameterValidator validator, IStringConverter<T> converter)
{
    String value = properties.getProperty(name);
    if (value == null && defaultValue != null)
    {
        value = defaultValue.toString();
    }
    if (validator != null)
    {
        validator.validate(name, value);
    }
    return value == null ? null : converter.convert(value);
}

private String getProperty(String name, IParameterValidator validator)
{
    return getProperty(name, validator, (IStringConverter<String>)String::toString);
}

private <T> T getProperty(String name, IParameterValidator validator, IStringConverter<T> converter)
{
    return getProperty(name, null, validator, converter);
}