substVars
public static String substVars(String val,
String currentKey,
Map<String,String> cycleMap,
Map<String,String> configProps)
throws IllegalArgumentException
This method performs property variable substitution on the specified
value. If the specified value contains the syntax
${<prop-name>}, where <prop-name>
refers to either a configuration property or a system property, then the
corresponding property value is substituted for the variable placeholder.
Multiple variable placeholders may exist in the specified value as well
as nested variable placeholders, which are substituted from inner most to
outer most. Configuration properties override system properties.
- Parameters:
val
- The string on which to perform property substitution.
currentKey
- The key of the property being evaluated used to detect
cycles.
cycleMap
- Map of variable references used to detect nested cycles.
configProps
- Set of configuration properties.
- Returns:
- The value of the specified string after system property
substitution.
- Throws:
IllegalArgumentException
- If there was a syntax error in the
property placeholder syntax or a recursive variable
reference.