final BooleanExpression isConstraintsPropertyNull = new BooleanExpression(new BinaryExpression(new VariableExpression(CONSTRAINED_PROPERTIES_PROPERTY_NAME), Token.newSymbol(
Types.COMPARE_EQUAL, 0, 0), new ConstantExpression(null)));
final BlockStatement ifConstraintsPropertyIsNullBlockStatement = new BlockStatement();
final ArgumentListExpression getConstrainedPropertiesForClassArguments = new ArgumentListExpression();
getConstrainedPropertiesForClassArguments.addExpression(new VariableExpression("this"));
getConstrainedPropertiesForClassArguments.addExpression(new ConstantExpression(defaultNullable));
final Expression getConstraintsMethodCall = new StaticMethodCallExpression(ClassHelper.make(ValidationSupport.class), "getConstrainedPropertiesForClass", getConstrainedPropertiesForClassArguments);
final Expression initializeConstraintsFieldExpression = new BinaryExpression(new VariableExpression(CONSTRAINED_PROPERTIES_PROPERTY_NAME), Token.newSymbol(Types.EQUALS, 0, 0), getConstraintsMethodCall);
final Statement ifConstraintsPropertyIsNullStatement = new IfStatement(isConstraintsPropertyNull, ifConstraintsPropertyIsNullBlockStatement, new ExpressionStatement(new EmptyExpression()));