/**
* Get the system property value if the string is of the format ${sysproperty}
*
* <p>You can insert default value when the system property is not set, by separating it at the
* beginning with ::
*
* <p><b>Examples:</b>
*
* <p>${idp} should resolve to a value if the system property "idp" is set.
*
* <p>${idp::http://localhost:8080} will resolve to http://localhost:8080 if the system property
* "idp" is not set.
*
* @param str
* @return
*/
public static String getSystemPropertyAsString(String str) {
if (str == null) throw logger.nullArgumentError("str");
if (str.contains("${")) {
Pattern pattern = Pattern.compile("\\$\\{([^}]+)}");
Matcher matcher = pattern.matcher(str);
StringBuffer buffer = new StringBuffer();
String sysPropertyValue = null;
while (matcher.find()) {
String subString = matcher.group(1);
String defaultValue = "";
// Look for default value
if (subString.contains("::")) {
int index = subString.indexOf("::");
defaultValue = subString.substring(index + 2);
subString = subString.substring(0, index);
}
sysPropertyValue = SecurityActions.getSystemProperty(subString, defaultValue);
if (sysPropertyValue.isEmpty()) {
throw logger.systemPropertyMissingError(matcher.group(1));
}
matcher.appendReplacement(buffer, sysPropertyValue);
}
matcher.appendTail(buffer);
str = buffer.toString();
}
return str;
}
