/**
* Retrieves a list of parameters from a passed request in comma delimited format. If the
* parameter is not found, an NPE is thrown.
*
* @param req Request object to look in
* @param name the name of the field from the html form
* @return the value from the html form corresponding to the name parameter
* @exception NullPointerException thrown if the name was not in the html form
*/
public static String getOptionalParameterValues(ServletRequest req, String name)
throws NullPointerException {
String[] values = req.getParameterValues(name);
if (values == null) {
return Config.EMPTY_STR;
}
StringBuffer ret = new StringBuffer();
for (int i = 0; i < values.length; i++) {
if (i > 0) {
ret.append(",");
}
ret.append(values[i]);
}
return ret.toString();
}
/**
* Retrieves a list of parameters from a passed request in comma delimited format. If the
* parameter is not found, an NPE is thrown.
*
* @param req Request object to look in
* @param name the name of the field from the html form
* @return the value from the html form corresponding to the name parameter
* @exception NullPointerException thrown if the name was not in the html form
*/
public static String getRequiredParameterValues(ServletRequest req, String name)
throws NullPointerException {
String[] values = req.getParameterValues(name);
if (values == null) {
throw new NullPointerException(
"This form requires a \""
+ name
+ "\" parameter, which was missing from the submitted request.");
}
StringBuffer ret = new StringBuffer();
for (int i = 0; i < values.length; i++) {
if (i > 0) {
ret.append(",");
}
ret.append(values[i]);
}
return ret.toString();
}