if (! this.definitions.containsKey(PWD)) {
CalculatedVariableDefinition pwdVariableDefinition = new CalculatedVariableDefinition();
pwdVariableDefinition.setDescription("Current working directory");
pwdVariableDefinition.setVariableName(PWD);
pwdVariableDefinition.setPath(true);
pwdVariableDefinition.setCalculation(new InitialPwdCalculation());
this.definitions.put(PWD,pwdVariableDefinition);
}
}