/Users/nah/Documents/code/cast/src/java/cast/configuration/EnvVarTokenizer.java

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package cast.configuration;

import java.util.StringTokenizer;

public class EnvVarTokenizer extends StringTokenizer {

        public EnvVarTokenizer(String _str) {
                super(_str);
        }

        public EnvVarTokenizer(String _str, String _delim) {
                super(_str, _delim);
        }

        public EnvVarTokenizer(String _str, String _delim, boolean _returnDelims) {
                super(_str, _delim, _returnDelims);
        }

        
        
        @Override
        public String nextToken() {
                return envVar(super.nextToken());
        }

        private String envVar(String _token) {

                if(_token.charAt(0) == '$') {
                        String var = System.getenv(_token.substring(1));
                        if(var == null) {
                                throw new RuntimeException("Undefined environment variable: " + _token);
                        }
                        return var;
                }
                else {
                        return _token;
                }
        }

        @Override
        public String nextToken(String _delim) {
                return envVar(super.nextToken(_delim));
        }

}

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