question: resolve $ ... placeholders in the given text , replacing them with corresponding system property values . concode_field_sep String PLACEHOLDER_SUFFIX concode_elem_sep String VALUE_SEPARATOR concode_elem_sep String SIMPLE_PREFIX concode_elem_sep String PLACEHOLDER_PREFIX concode_field_sep String getProperty concode_elem_sep String getProperty concode_elem_sep String getProperty concode_elem_sep String resolvePlaceholder concode_elem_sep String parseStringValue concode_elem_sep boolean substringMatch concode_elem_sep int findPlaceholderEndIndex
target: String function ( String arg0 ) { if ( arg0 == null ) { return arg0 ; } return parseStringValue ( null , arg0 , arg0 , new HashSet < String > ( ) ) ; }